Carbon Utilization Research Articles

Thermodynamic and Kinetic Analysis of a CO2 Hydrogenation Pilot Scale Reactor for Efficient Methanol Production

Decarbonization of hard-to-abate industrial sectors, namely the extractive industries, has become an imperative, and thus, processes such as carbon capture and utilization (CCU) have been explored thoroughly and seem to be a promising solution. Carbon dioxide (CO2) catalytic hydrogenation employing green hydrogen (H2) to produce synthetic methanol (MeOH) aims to utilize industrial-captured carbon. A thermodynamic and kinetic analysis of a pilot scale methanol synthesis reactor was conducted by modeling the process using Aspen Plus V12 software. The methanol synthesis model consists mainly of a multi-tubular packed-bed reactor with a thermal oil heat recovery system, a product separator, and an internal recycle loop for optimal efficiency. The reactor has a 5 kg h−1 methanol production capacity, and its heat recovery system achieves an overall heat reduction of 64.1% and can retrieve 1.293 kWh per kg of methanol produced. The overall carbon conversion achieved is 80.6%. Valuable information concerning the design and profile of the reactor is provided in this study.

CO2 Electroreduction to Multicarbon Products Over Cu2O@Mesoporous SiO2 Confined Catalyst: Relevance of the Shell Thickness

AbstractDespite the advantage of high carbon utilization, CO2 electroreduction (CO2ER) in acid is challenged by the competitive hydrogen evolution reaction (HER). Designing confined catalysts is a promising strategy to suppress HER and boost CO2ER, yet the relationship between the confined structure and catalytic performance remains unclear, limiting rational design. Herein, using Cu2O@mesoporous SiO2 core‐shell catalysts as a well‐defined platform, a volcano‐shaped relationship is found between the thickness of mesoporous SiO2 layer and productivity of multicarbon (C2+) products in CO2 electroreduction. The optimal shell thickness of 15 nm is identified, with in situ spectroscopies and theoretical simulations attributing this to the trade‐off between the local alkalinity and CO2 concentration, arising from the nanoconfinement effect. At this optimal thickness, the Cu2O@ mesoporous SiO2 catalyst achieves a C2+ Faradaic efficiency of 83.1% ± 2.5% and partial current density of 687.8 mA cm−2 in acidic electrolytes, exceeding most reported catalysts. This work provides valuable insights for the rational design of confined catalysts for electrocatalysis.

Ce3+/Ce4+ Ion Redox Shuttle Stabilized Cuδ+ for Efficient CO2 Electroreduction to C2H4

AbstractThe CO2 electroreduction reaction has advantages in clean and pollution‐free carbon conversion, but it still faces challenges in carbon utilization efficiency and improving the selectivity of C2 products. Although the dynamic Cuδ+ state is known to favor the C−C coupling process, the suitable Cuδ+ species for electrocatalytic reduction of CO2 are difficult to maintain under the conditions of strong reduction and large current. Herein, we propose a Ce doping strategy to stabilize the Cuδ+ state (Ce/CuOx) during the CO2RR process, which enables a high Faradaic efficiency of 60 % for multi‐carbon products (40 % for C2H4, 14 % for CH3CH2OH, and 6 % for CH3COOH), and 25 h stability at −1.2 V versus the reversible hydrogen electrode. In situ infrared spectroscopy, in situ X‐ray photoelectron spectroscopy combined with density functional theory calculations reveal that the Cuδ+ is stabilized by the redox ion pairs of Ce, which reduces the energy barrier of *CO coupling, and improves the Faraday efficiency of electrocatalytic CO2 reduction of C2H4. This work provides a new idea to make full use of lanthanide variable value metals for advanced catalysis and clean energy conversion.

Developing Heterogeneous Catalysts for Reverse Water–Gas Shift Reaction in CO2 Valorization

Abstract Carbon dioxide capture and utilization (CCU) in chemical processes is vital for achieving sustainable and economically viable solutions in the context of climate change mitigation. This review focuses on the reverse water–gas shift (RWGS) reaction as a promising pathway for converting CO₂ into carbon monoxide (CO), which can subsequently be used as a precursor for the synthesis of various hydrocarbon compounds. The discussion centers on catalyst design strategies aimed at enhancing the low-temperature activity of the RWGS reaction, emphasizing the roles of catalyst supports and active sites. Key approaches include increasing surface area, introducing defect sites, and improving the redox properties of the catalysts. Methods for controlling the adsorption strength of gas reactants and products to enhance CO selectivity are explored, with particular attention to the use of ligands, promoters, doping, and advanced structures such as single-atom or core–shell configurations. Considerations regarding catalyst durability in reducing environments and the development of economically feasible catalysts are also addressed. Well-designed catalysts for the RWGS reaction offer significant advantages in CO₂ valorization, as the conversion of CO₂ to hydrocarbons is more readily achieved starting from CO.

Harnessing Ruthenium and Copper Catalysts for Formate Dehydrogenase Reactions.

Formic acid (HCOOH) is a promising source of hydrogen energy that can be used to produce hydrogen in a more economical and ecological way. Formic acid is a simple carboxylic acid with a high hydrogen concentration and is generally stable, making it useful as a hydrogen transporter. Catalytic dehydrogenation is usually used to extract hydrogen from formic acid; this process releases hydrogen gas and yields carbon dioxide as a byproduct. Comparing this technology to conventional hydrogen generation methods, there are several benefits, such as the utilization of the formic acid handling infrastructure already in place and the possibility of a simpler integration into different energy systems. Notwithstanding, several obstacles persist, including enhancing the effectiveness of the dehydrogenation procedure and reducing the ecological consequences of the correlated carbon dioxide discharges. Catalysts, reaction conditions, and carbon collection and utilization methodologies are all being researched further. The development of Ru and Cu-based catalysts for the catalytic breakdown of HCOOH into CO2 and H2 is the main topic of this account. Herein, the focus is on the kinetic studies of HCOOH dehydrogenation, encompassing mechanistic investigations that consider intermediate studies and DFT calculations.

A Review of Algae-Based Carbon Capture, Utilization, and Storage (Algae-Based CCUS)

Excessive emissions of greenhouse gases, primarily carbon dioxide (CO2), have garnered worldwide attention due to their significant environmental impacts. Carbon capture, utilization, and storage (CCUS) techniques have emerged as effective solutions to address CO2 emissions. Recently, direct air capture (DAC) and bioenergy with carbon capture and storage (BECCS) have been advanced within the CCUS framework as negative emission technologies. BECCS, which involves cultivating biomass for energy production, then capturing and storing the resultant CO2 emissions, offers cost advantages over DAC. Algae-based CCUS is integral to the BECCS framework, leveraging algae’s biological processes to capture and sequester CO2 while simultaneously contributing to energy production and potentially achieving net negative carbon emissions. Algae’s high photosynthetic efficiency, rapid growth rates, and ability to grow in non-arable environments provide significant advantages over other BECCS methods. This comprehensive review explores recent innovations in algae-based CCUS technologies, focusing on the mechanisms of carbon capture, utilization, and storage through algae. It highlights advancements in algae cultivation for efficient carbon capture, algae-based biofuel production, and algae-based dual carbon storage materials, as well as key challenges that need to be addressed for further optimization. This review provides valuable insights into the potential of algae-based CCUS as a key component of global carbon reduction strategies.

Drivers and Challenges in Achieving Corporate Carbon Neutrality—Qualitative Investigation of Carbon Capture, Utilization, and Storage Technologies

ABSTRACTThe importance of attaining carbon neutrality (CN) has progressively increased in addressing climate change, and consequently, carbon capture, utilization, and storage (CCUS) has emerged as a promising tool in this pursuit. Nevertheless, a dearth of scholarly discourse exists about the factors that drive the implementation of CCUS in the context of corporate CN and the challenges that inhibit the adoption of CCUS for CN. This study aims to bridge this knowledge gap by analyzing open‐ended essays to gain cardinal insights into the experiences and perspectives of companies successfully implementing CCUS for CN. The collected (qualitative) data underwent rigorous analysis to synthesize three distinct dimensions encompassing various aspects of CCUS to achieve CN. The study identifies multiple CCUS components employed to manage carbon emissions effectively. It underscores the five drivers accelerating the adoption of CCUS and classifies them as intrinsic or extrinsic drivers. Various challenges impeding the successful adoption of CCUS have been pinpointed as emanating from financial, human resource, operational, technological, and strategic challenges; technology development and infrastructural challenges, environmental impacts; and social and regulatory challenges. Our research renders valuable theoretical and practical insights based on the prevalent discourse regarding the implementation of CCUS in the field of CN with a comprehensive and inclusive approach.

A strategic insight into the market for carbon management capacity

This study presents the market for carbon management capacity via carbon capture, utilization, and storage technologies, identifying demand and supply forces, as well as clarifying the potential impact of market and non-market-based shocks on technology developers versus adopters. The paper addresses a prevailing gap in market analysis, introducing a microeconomic framework and unique dataset to identify key players, market forces, and policy incentives shaping the carbon capture, utilization, and storage landscape. The analysis equips industry stakeholders, policymakers, and investors with valuable insights regarding (1) leaders in the design, development, and manufacture of carbon capture, utilization, and storage technologies (supply), (2) early technology adopters (demand) who are at the forefront in the pursuit of sustainable carbon management, and (3) the need to use both market and non-market forces to achieve decarbonization across multiple sectors.

Advancing syngas production: A comparative techno-economic analysis of ICCU and CCU technologies for CO2 emission reduction

The Paris Agreement stresses the need to cut CO2 emissions, a global priority. Innovative methods like carbon capture and utilization (CCU) aim to limit the temperature increase to 1.5 °C by 2100. Traditional CCU involves separate CO2 collection and purification steps, while integrated carbon capture and utilization (ICCU) streamlines the process by capturing CO2 using CaO adsorbents and using it with CH4 on-site to produce syngas. ICCU reduces CO2 conversion costs by eliminating intermediaries, potentially resulting in lower operational costs than traditional CCU. This study employs the Aspen Plus model to evaluate ICCU and CCU processes, analyzing parameters such as CaCO3 consumption, purge production, annual CO and H2 production, energy balance, total annual costs, and CO production costs. Results show that ICCU generates 1.39 million tons of CO annually, with lower CH4 and CaCO3 consumption along with improved energy efficiency at 46.75% compared to CCU for 42.49%. ICCU incurs an annual capital outlay of $554.92 million with $396.94/ton of CO, while CCU costs M$853.10/year with $325.11/ton of CO. Notably, ICCU reduces costs of CO2 avoidance to $380.44/ton compared to $513.59/ton for CCU. These findings highlight ICCU as a more efficient and cost-effective approach to reducing CO2 emissions, aligning with the Paris Agreement goals and providing insights for future deployment and regulatory considerations. The use of Aspen Plus simulation software has been instrumental in facilitating the analysis, modeling, and validation of these conclusions.

Policy stagnation or reevaluation? Exploring the regulatory dimensions of carbon capture, utilisation and storage in Finland and the Baltic countries

Carbon capture, utilisation and storage (CCUS) technologies are increasingly viewed as essential tools in the global effort to mitigate climate change by rapidly reducing carbon emissions. Within the European Union (EU) regulatory framework, these technologies are positioned as critical components in the transition to an industrial climate-neutral future, as they hold significant potential to reduce carbon emissions and help meet long-term climate goals. Yet, despite this potential, the large-scale deployment of CCUS technologies continues to face challenges. This study explores the specific regulatory and policy challenges hindering the implementation of CCUS in Finland, Estonia, Latvia and Lithuania. The policy cycle approach used in the analysis highlights the importance of continuous evaluation and adaptation to ensure policies remain effective and responsive to both technological advancements and societal needs. Through interviews with high-level decision-makers and industry representatives and a comparative analysis of national policies and their alignment with EU-level regulations, the research identifies a significant disconnect between EU ambitions and national execution. Scepticism from decision-makers towards CCUS technologies, coupled with a lack of trust in regulatory bodies from the industry, has further intensified these challenges and made it difficult for CCUS technologies to gain momentum. To address these issues, we recommend clearer, more harmonised regulations and increased collaboration between decision-makers, industries and researchers. The successful implementation of CCUS technologies could significantly contribute to achieving shared climate goals.

Advances and Applications of Carbon Capture, Utilization, and Storage in Civil Engineering: A Comprehensive Review

This paper thoroughly examines the latest developments and diverse applications of Carbon Capture, Utilization, and Storage (CCUS) in civil engineering. It provides a critical analysis of the technology’s potential to mitigate the effects of climate change. Initially, a comprehensive outline of CCUS technologies is presented, emphasising their vital function in carbon dioxide (CO2) emission capture, conversion, and sequestration. Subsequent sections provide an in-depth analysis of carbon capture technologies, utilisation processes, and storage solutions. These serve as the foundation for an architectural framework that facilitates the design and integration of efficient systems. Significant attention is given to the inventive application of CCUS in the building and construction industry. Notable examples of such applications include using carbon (C) in cement and promoting sustainable cement production. Economic analyses and financing mechanisms are reviewed to assess the commercial feasibility and scalability of CCUS projects. In addition, this review examines the technological advances and innovations that have occurred, providing insight into the potential future course of CCUS progress. A comprehensive analysis of the environmental and regulatory environments is conducted to evaluate the feasibility and compliance with the policies of CCUS technology deployment. Case studies from the real world are provided to illustrate effectiveness and practical applications. It concludes by emphasising the importance of continued research, policy support, and innovation in developing CCUS technologies as a fundamental component of sustainable civil engineering practices. A tenacious stride toward carbon neutrality is underscored.

Machine learning-based techno-econo-environmental analysis of CO2-to-olefins process for screening the optimal catalyst and hydrogen color

CO2 to light olefins (CTLO) is an attractive strategy for CO2 fixation to obtain high-value-added chemical products. Selecting the optimal catalyst and hydrogen source for the process has become increasingly challenging due to the wide range of developed catalysts and diverse hydrogen sources available. Herein, this study proposes a machine learning-based techno-econo-environmental analysis framework for screening catalysts and hydrogen colors for the CTLO process. The preferred machine learning model is employed to screen the most promising catalyst for the CTLO process, which is then applied to accomplish the conceptual design of the entire process to obtain essential material and energy balance results by process modeling and simulation. Finally, the techno-econo-environmental performance of the CTLO processes using various colored hydrogen are compared to provide more informed choices. The results indicate the extreme gradient boosting model exhibits superior predictive accuracy, making it suitable for integrating with the genetic algorithm to screen the optimal catalyst for the CTLO process. After multi-objective optimization, an optimal Fe-based catalyst is screened and used for the modeling and simulation of the CTLO process due to its highest light olefins yield (36.43%). The carbon, hydrogen, and exergy utilization efficiencies of the CTLO process considering solely the target light olefins are 59.58%, 21.71%, and 40.41%, respectively. After evaluating the impact of different H2 colors on the total operating cost, unit production cost, and minimum selling price of the CTLO process, it was found the CTLO process using gray H2 generated by coke oven gas and coal gasification technologies exhibits the most favorable cost-effectiveness and optimal market price compared to alternative production scenarios. However, using green H2 proves highly advantageous for the CTLO process in attaining comprehensive negative carbon emissions throughout its lifecycle. Moreover, it anticipates the influence of technological advancements and market fluctuations on the market competitiveness of CTLO processes with diverse hydrogen colors.

Optimization of liquefaction cycles applied to CO2 coming from onshore pipeline to offshore ship transportation

In the field of the CO2 transportation for the Carbon Capture, Utilization and Storage (CCUS) process chain, several analyses show that, for a large-scale CO2 transportation, pipeline transportation is the preferred method on land due to its lower cost. Barges also present a feasible alternative if the capture site is near a waterway. Maritime transport becomes more advantageous than pipelines, particularly over long distances and across ocean. Despite the need to liquefy CO2 and to add temporary storage facilities for loading and unloading onto ships, beyond a certain distance at fixed CO2 transported and plant life, ship transport optimal at pressures of 7 or 15 bar depending on the type of vessel. Impurities in CO2, arising from various industrial processes and variable performances of capture technologies, increase energy consumption during compression and could cause corrosion risks. Specifications for CO2 ship transport limit the concentration of certain impurities with strict thresholds. Methods for purifying CO2, such as the two-flash system and stripping column, have been proposed to meet these specifications. The studied CO2 liquefaction methods show that hybrid cycles, combining open cycle with Joule-Thompson expansion and closed cycle with cooling machine offer reduced energy consumption and improved CO2 recovery compared to open or closed cycles. In the presence of the maximum threshold of impurities in the pipeline, energy consumption can nearly double from 21.8 kWh/tCO2 to 40.9 kWh/tCO2, with the highest recovery rising 98.1 %. This research underscores the importance of optimizing CO2 transport strategies to facilitate the deployment of CCUS technologies.

Investigating the impacts of the Dual Carbon Targets on energy and carbon flows in China

As the world’s largest carbon emitter, China has committed to ambitious “Dual Carbon Targets” to address climate change. To investigate the impact of the Dual Carbon Targets on energy consumption and carbon dioxide (CO2) emissions, CO2 emissions were calculated, and Sankey diagrams of energy and CO2 flows for 2018-2022 were drawn based on the latest energy statistics. This study finds that China’s primary energy supply was 5.429 Gtce, with terminal energy consumption at 3.801 Gtce in 2022. CO2 emissions reached 12.01 Gt, marking a 12.24% increase since 2018. Emission intensity varies regionally, being higher in the north and lower in the south, with a national average of 0.1 kg/CNY. Coal continues to dominate energy consumption at 64%, though its share of emissions is declining, particularly in transportation and residential sectors. By 2060, electricity is expected to become the primary energy source, significantly lowering carbon emissions, with Carbon Capture, Utilization, and Storage technologies playing a crucial role in achieving the targets. This analysis provides critical insights into China’s transition to a low-carbon economy, serving as a valuable resource for policymakers to optimize the energy structure and meet environmental goals.

A time-lapse multicomponent (9C 4D) seismic study at Vacuum Field, New Mexico, USA

In November and December 1995, the Reservoir Characterization Project (RCP) at the Colorado School of Mines acquired time-lapse multicomponent 3D surveys over the Central Vacuum Unit of Vacuum Field in Lea County, New Mexico. Two surveys were acquired — one before and one after the injection of 50 MMscf CO2 through a single wellbore into the San Andres Reservoir. The project determined that repeated multicomponent seismic surveys at the earth's surface can detect changes in bulk rock properties due to variations in reservoir pressures and fluid properties. Interpretation of the dynamic seismic response due to reservoir production processes over time provides an image of the relative permeability structure of the reservoir. Time-lapse multicomponent data were acquired using three-component geophones and vertically and horizontally actuated vibrator sources at the surface. A data processing flow was developed for time-lapse multicomponent 3D surveys. It uses surface-consistent processing algorithms and the source and receiver redundancy between initial and repeat surveys to derive surface-consistent corrections. Differences in S-wave polarization are measured between the initial and repeat surveys. S-wave data show sensitivity (through birefringence) to anisotropy caused by the orientation of fractures and low-aspect-ratio pore structure in a nonuniform stress field. The direction of fast S-wave polarization can be related to the direction of maximum horizontal stress and preferential permeability. Pore-pressure variations alter the effective stress. This varies the direction and intensity of open fractures and low-aspect-ratio pore structure within the current permeability structure of the reservoir, causing detectable changes in S-wave anisotropy. Anomalies in S-wave anisotropy, interpreted from time-lapse multicomponent 3D data, in conjunction with reservoir production data, are consistent with the fluid composition and pore-pressure changes associated with the CO2 injection program and reservoir processes in the survey area. Applications include monitoring hydrocarbon enhanced oil recovery; carbon capture, utilization, and storage; hydraulic stimulation; induced seismicity; and geothermal investigations.

Deactivated Ca-based sorbent derived from calcium looping CO2 capture as a partial substitute for cement to obtain low-carbon cementitious building materials

Calcium looping CO2 capture is a highly promising technology for carbon capture, utilization, and storage. Nevertheless, the disposal of deactivated calcium-based sorbents following cyclic carbonation and calcination processes presents an unresolved challenge. Concurrently, the development of low-carbon cement products is also a critical priority. Given the calcium-rich composition and carbon-negative nature of the calcium-based sorbent, it is proposed that the deactivated sorbent could be utilized as a partial substitute for cement in the production of building materials. This paper explored the potential of using two types of deactivated calcium sorbent (DPC/DGC) to partial substitute cement for low-carbon cementitious materials production. The effects of partial substitution of cement materials on volume stability, compressive/flexural strength, hydration kinetics, and carbon emission of the composite cementitious materials were investigated. The results indicate that a 5% and 10% replacement of cement with DPC/DGC has modest impact on volumetric stability and compressive strength. The composite cement with 5% DPC replacement achieves a 28-day compressive strength of 48.1MPa, representing a 0.4% increase compared to the 47.9MPa observed in the reference sample. Specimens with 15% DPC/DGC substitution exhibit inferior volume stability and mechanical performance than the control sample. The total hydration heat releases decrease with the increasing substitution ratio due to the dilution effect by the introduction of DPC/DGC. Additionally, substituting cement with Ca-based sorbents significantly reduced the carbon footprint of construction materials. The net carbon footprints for the building materials that containing 1 ton of binder (substitued with 10wt% DPC and DGC) were 152.5kg and 43.5kg, corresponding to reductions of 79.6% and 94.2% compared to reference cement mortar. These carbon footprints are projected to further decrease to -108.5kg and -375.5kg when DPC and DGC were obtained after 100 CO2 capture cycles. A novel technological route combining the high-temperature calcium looping CO2 capture and CO2 mineralization curing was proposed, and the associated challenges of this method were also discussed.

Mechanism of biochar-Cu-based catalysts construction and its electrochemical CO2 reduction performance

Electrochemical CO2 reduction can convert CO2 into high-value-added products for special forms of energy storage and efficient carbon utilization for renewable electricity. To investigate the influence of biochar-Cu-based catalysts properties on electrochemical CO2 reduction performance, Cu is loaded onto rice husk-based biochar by impregnation method combined with pyrolysis and calcination in this study. The three synthesized biochar-Cu-based catalysts are tested for activity and electrochemical CO2 reduction performance in Flow Cell. The results show that biochar's properties, such as its high specific surface area, rich pore structure, and adjustable pore structure, provide sufficient sites for CO2 reduction. Urea can relatively increase the copper loading by 44 %, but it will also increase the clustering of copper. In the reduction performance test, the current density of char-Cu-700 is 2.08 times higher than that of char-Cu and 1.45 times higher than char-Cu-N at a reduction potential of -0.45 (V vs. RHE). The current density enhancement of the catalyst loaded on biochar with Cu particle size of 10 nm is about 50 % higher than that of the catalyst with a particle size of 20 nm. It indicates that the smaller the particle size of Cu at the nanoscale, the lower the average coordination of surface atoms and the greater the catalyst's reactivity. This study provides novel ideas for synthesizing biochar-Cu-based catalysts, lays part of the theoretical foundation for using biochar-Cu-based catalysts for electrochemical CO2 reduction, and provides experimental support for optimizing the catalyst structure.

Can section 45Q tax credit foster decarbonization? A case study of geologic carbon storage at Acid Gas Injection wells in the Permian Basin

Carbon capture, utilization, and storage (CCUS) is an important pathway for meeting climate mitigation goals. While the economic viability of CCUS is well understood, previous studies do not evaluate the economic feasibility of carbon capture and storage (CCS) in the Permian Basin specifically regarding the new Section 45Q tax credits. We developed a technoeconomic analysis method, evaluated the economic feasibility of CCS at the acid gas injection (AGI) wells, and assessed the implication of Section 45Q tax credits for CCS at the AGIs. We find that the compressors, well depth, and the permit and monitoring costs drive the facility costs. Compressors are the predominant contributors to capital and operating expenditure driving the levelized cost of CO2 storage. Strategic cost reduction measures identified include 1) sourcing of low-cost electricity and 2) optimizing operational efficiency in well operations. In evaluating the impact of the tax credits on CCS projects, facility scale proved decisive. We found that facilities with an annual injection rate exceeding 10,000 MT storage capacity demonstrate economic viability contingent upon the procurement of inputs at the least cost. The new construction of AGI wells were found to be economically viable at a storage capacity of 100,000 MT. The basin is heavily focused on CCUS (tax credit – $65/MT CO2), which overshadows CCS ($85/MT CO2) opportunities. Balancing the dual objectives of CCS and CCUS requires planning and coordination for optimal resource and pore space utilization to attain the basin's decarbonization potential. We also found that CCS on AGI is a lower cost CCS option as compared to CCS on other industries.

Optimal long-term planning of CCUS and carbon trading mechanism in offshore-onshore integrated energy system

The offshore-onshore integrated energy system (OOIES) interconnects the offshore oil extraction platforms, offshore wind farms (OWFs), onshore coal/gas-fired power plants and oil distillation factories, which has great potential in CO2 emission reduction. To investigate its long-term CO2 emission reduction and economic benefits in the subsequent operation, an optimal long-term planning (OLTP) model of carbon capture, utilization, and storage (CCUS) and carbon trading mechanism (CTM) in OOIES is proposed. In the model, a CCUS model using the geological reservoir model for CO2 enhanced oil recovery (CO2-EOR) is proposed, a price-based CTM with carbon emission allowance and Chinese certified emission reduction is included, multi-band intervals are used to describe the uncertain prices and OWF outputs, and GlueVaR is introduced to measure the risks caused by uncertainties for risk management. For the solution of the OLTP model, the geological reservoir model with partial differential equations is transformed into mix-integer linear constraints by using the implicit pressure explicit saturation method, the ReLU-based multi-layer perceptron method and the convex envelop relaxation technique. Moreover, by applying multi-band interval possibility degree and GlueVaR's coherence, the original uncertainty optimization model is transformed into a mixed-integer linear programming model. Case study on an actual OOIES on the east bank of the Pearl River estuary demonstrates the effectiveness of the proposed method. Compared to the optimal results without CCUS and CTM, the optimal results of the proposed method reduce the CO2 emission by 13.28 % and the expected value and GlueVaR of total cost by 2.381 % and 22.480 %, respectively.

To adopt the CCUS technology or not? An evolutionary game analysis between coal-to-hydrogen plants and oil-fields

Producing hydrogen from coal with carbon capture, utilization and storage (CCUS) could be pivotal to establishing a hydrogen economy. It is crucial to study the behavioral strategies of the parties involved in the diffusion of CCUS technology. This paper fills the gap in existing research by developing an evolutionary game model between energy companies and oil fields with commercial cooperation to analyze their interactions. Based on the numerical simulation, the effects of critical parameters on evolution trajectories were analyzed and discussed. The results indicate that neither coal-to-hydrogen enterprises nor oil fields are presently willing to participate in CCUS projects, so appropriate incentives must be taken to promote its advancement. Empirical studies have found that, with other conditions unchanged: (i) A blue hydrogen price of CNY 35.6/kg H2 and a carbon market price of CNY 150/t CO2 can promote hydrogen production enterprises to engage in low-carbon production; (ii) The establishment of a carbon tax policy about CNY 130/t CO2 can also motivate hydrogen plants to install carbon capture devices and reduce greenhouse gas emissions to avoid heavy penalties; (iii) A mature oil market and its high price level is sufficient to offset the inhibiting effect of higher carbon market prices on the willingness of oil fields to cooperate; (iv) Government subsidy policies need to be organically combined with market mechanisms such as carbon tax to effectively reduce the investment risks of enterprises and promote project cooperation.