Greenhouse Gas Sequestration Research Articles

Analyzing technology landscape of carbon capture storage and utilization in Baltic Sea region through patents

Capturing CO2 and preventing it from being released into the atmosphere was first suggested in 1977; using existing technology in new ways. CO2 capture technology has been used since the 1920s for separating CO2 sometimes found in natural gas reservoirs from the saleable methane gas. More recently, investment in CCS is being driven by the oil and gas industries as well as cement, iron and steel, and chemical production industries in the push for decarbonization. Once it is separated from other gases, the carbon dioxide is then compressed, transported, and injected underground for permanent storage. About 90-100 % of produced carbon dioxide can be captured in this manner. Many are betting on CCS as a key to greenhouse gas emission reductions, since leveraging CCS is expected to achieve 14-19 % of the reductions needed by 2050 (1,2,3). In 2020, we sent 40 billion metric tons (t) of carbon dioxide into Earth’s atmosphere. We need to cut that number to 0 by 2050 if we are to avoid the worst consequences of climate change, according to the Intergovernmental Panel on Climate Change (IPCC). The objectives of this paper is to present the patent landscape of Baltic sea region countries (BSR), which includes Lithuania, Latvia, Estonia, Finland, Denmark, Sweden, Russia, Poland and Norway. To perform the analysis searches have been conducted to identify patents related to Carbon capture and sequestration for the BSR. Patent analytics searches have been restricted to dates from 2000-2020. Technologies investigated mainly focuses on CO2 storage, monitoring, utilization and transport.The patent analytics searches have been conducted to identify patents related to CCUS technology. The search resulted in 3299 patent families. A relevancy analysis was done to identify patents which are related to CCUS & resulted in 497 patent families. Identified relevant patents have been categorized in a classification scheme. Results of this patent analytics work shows that in 2009 we have the greatest number of IP activity for CCUS. Exponential growth in patent filing since 2005-2009, showing an increasing trend for CCUS activities, 2010-2015 has an exponential decreasing trend for CCUS activities. In northern and eastern Europe, Russia & Poland are leading the research & patent filing in the CCUS domain. From industry point of view General Electrics (GE)has the highest number of publications followed by Mitsubishi and Siemens. 85 % of 497 relevant Patent families are Alive. GE has around 78 % of its families alive. The top patents are related to capture, storage, sequestration or disposal of greenhouse gases and followed by patents related to separation processes. CO2 capture is the most explored technology/CCUS type along with storage. Unfortunately, there is a decreasing trend in patent filings since 2016. The CCUS technologies are striving to gain traction in the set of options for dealing with climate change, but growth is very slow due to absence or low intervention of government action on climate change, public scepticism, increasing costs, and advances in other options including renewables and shale gas.

Can Ammonia Be Used To Enhance the CO2 Sequestration in Methane Hydrates: A Molecular Dynamics Perspective

Sequestration of greenhouse gases, like CO2, in methane hydrates reduces both environmental pollution and increases fuel recovery of methane simultaneously. This approach is thermodynamically feasible as a result of the higher stability of carbon dioxide hydrates than methane hydrates. However, a few bottlenecks, like low permeability and the replacement kinetics of CO2 beyond the surface layers of the hydrate, limit this process. Therefore, the objective of this study is to understand this phenomenon at a molecular level by conducting long-scale molecular dynamics simulations for a microsecond. It then tries to verify if the defects caused in the structure with a tertiary molecule, like ammonia, can enhance the process by carrying CO2 beyond the surface layers. Additionally, the impact of ammonia on the methane recovery for the same concentrations of CO2 is also studied. Analysis of properties like hydrogen bonding and changes in the number of cages is conducted, which indicates encouraging results for such an enhancement upon optimizing the concentrations of ammonia.

Role of Algae in Built Environment and Green Cities: A Holistic approach towards Sustainability

The changing lifestyle, urbanization, and depletion of non-renewable resources to match the ever-increasing energy demand are causing a pessimistic impact on the environment. The cities are responsible for 75% of carbon emissions and about 60-80% of the energy consumption globally, causing a precarious situation because they only constitute 3% of the earth’s land. Urbanization makes the cities vulnerable due to the changing climatic conditions and possibilities of natural deserts disasters, thereby compelling the researchers to go for planning building green and resilient cities. Green cities are imperative in resisting the environmental crisis and assure a sustainable future for the upcoming generations. The pivotal role for the green cities is played by the renewable sources of energy. Therefore, solar and wind energy systems were employed, but eventually these renewable energy systems are associated with cost and pollution issues. This led to the paradigm-shifting towards algae as a third-generation feedstock and it is expected to become a potential source of green energy and environment due to the following advantages: (i) sequestration of CO2 and other greenhouse gases (GHGs), (ii) they can be easily and rapidly cultured and bioengineered, (iii) they can utilize the wastewater as a source of nutrients for its cultivation, (iv) their growth does not depend upon the geography and climate, and (v) algal biomass can be processed into biofuels (biodiesel, bioethanol, biogas etc) and other useful bioproducts (biofertilizer & biochar). This review paper incorporates the role of microalgal bioreactive façades (algae powered buildings) in the simultaneous mitigation of environment and energy production, contributing to green cities. Since the importance of Urban Green Space (UGS) is imperative for green cities, its functions and role during the critical period of the pandemic are also explained together with the efficient and viable biofoundry approach of converting algal blooms in urban water bodies to energy and useful products.

Green Mining Takes Place at the Power Plant

The number of large coal power plants, characterized by pithead plants, is increasing rapidly in major coal mining countries around the world. Overburden movement caused by coal mining and greenhouse gas emissions caused by coal thermal power generation are intertwined, and have become important challenges for mine ecological environment protection at present and in the future. In order to provide more options for green mining in large coal power plants, a large coal power base in northwest China was taken as the researching background in this paper, and a green mining model considering the above two aspects of ecological environment damages was proposed; that is, the carbon dioxide greenhouse gas produced by coal-fired power plants can be geologically trapped in goaf, whose overburden stability is controlled by backfill strips made of solid mine waste. In order to explore the feasibility of this model, the bearing strength of the filled gray brick consisting mainly of aeolian sand and fly ash under different curing methods was firstly studied, and it was discovered that the strength of the gray brick significantly improved after carbonization curing. After that, X-ray diffraction (XRD) and scanning electron microscopy (SEM) were employed to compare the mineral composition and its spatial morphology in gray brick before and after carbonization, and it is believed that the formation of dense acicular calcium carbonate after carbonization curing was the fundamental reason for the improvement of its bearing strength. Finally, a series of stope numerical models were established with UDEC software to analyze the surface settlement, crack propagation height and air tightness of the overlying strata, respectively, when goaf was supported by the backfilling strips with carbonized gray brick. The research results of this paper showed that the stability of overlying strata in goaf can be effectively controlled by adjusting the curing methods, width and spacing of the filled gray brick, so as to facilitate the following geological sequestration of carbon dioxide greenhouse gas in goaf. Consequently, the ecological environment damages caused by coal mining and utilization in a large coal power base can be resolved as a whole, and the purpose of green mining can be achieved as desired.

Concurrent 13. Presentation for: Exploration and appraisal year in review 2021

Presented on Wednesday 18 May: Session 13 Petroleum exploration and appraisal activity increased in 2021. Exploration spend increased for the year, continuing a positive trend. Onshore exploration and appraisal activity continues to dominate the petroleum exploration scene in Australia. Positive indications of increased work program bids (wells, seismic and spend) are, however, tempered by the downward trend of total exploration acreage (by area) and new acreage awards. In addition to petroleum exploration acreage, greenhouse gas sequestration acreage was released across Australia in 2021. Twenty-nine exploration wells were drilled in the year compared to twenty-five in the previous year. Eight conventional petroleum discoveries were reported, with the Artisan-1 discovery in the Otway Basin being the only offshore discovery. The Lockyer Deep-1 gas discovery in the Northern Perth Basin continues the exploration success of the Permian Kingia and High Cliff Sandstone play. The Cooper–Eromanga Basin continues to yield discoveries with the Odin-1, Rosebay-1, Lowry South, Liger-1 and Chimera-1 discoveries reported for the year. Thirty-one appraisal wells were drilled for the year with significant activity in the Northern Perth Basin, Cooper-Eromanga Basin and Bowen-Surat Basins. Exploration and appraisal drilling also continued in the Beetaloo Sub-basin with the drilling of the Tanumbirini-2H, Tanumbirini-3H and Carpentaria-2/2H wells during the year. To access the presentation click the link on the right. To read the full paper click here

Indigenous-Led Nature-Based Solutions for the Climate Crisis: Insights from Canada

This article provides an international and national overview of climate change and biodiversity frameworks and is focused on emerging evidence of Indigenous leadership and collaborations in Canada. After introducing the international context and describing the national policy landscape, we provide preliminary evidence documenting emerging national, regional, and local examples of Indigenous-led collaborative conservation projects and nature-based climate change solutions for the climate crisis. Based on our preliminary data, we suggest that Indigenous peoples and communities are well-positioned and currently have and will continue to play important roles in the protection, conservation management, and restoration of lands and waters in Canada and globally. These efforts are critical to the global mitigation, sequestration, and storage of greenhouse gases (GHGs) precipitating the climate crisis while also building adaptive resiliency to reduce impacts. Emerging Canadian evidence suggests that there are a diversity of co-benefits that Indigenous-led nature-based solutions to climate change and biodiversity protection bring, enabled by creating ethical space for reconciliation and conservation collaborations.

Exploration and appraisal year in review 2021

Petroleum exploration and appraisal activity increased in 2021. Exploration spend increased for the year, continuing a positive trend. Onshore exploration and appraisal activity continues to dominate the petroleum exploration scene in Australia. Positive indications of increased work program bids (wells, seismic and spend) are, however, tempered by the downward trend of total exploration acreage (by area) and new acreage awards. In addition to petroleum exploration acreage, greenhouse gas sequestration acreage was released across Australia in 2021. Twenty-nine exploration wells were drilled in the year compared to twenty-five in the previous year. Eight conventional petroleum discoveries were reported, with the Artisan-1 discovery in the Otway Basin being the only offshore discovery. The Lockyer Deep-1 gas discovery in the Northern Perth Basin continues the exploration success of the Permian Kingia and High Cliff Sandstone play. The Cooper–Eromanga Basin continues to yield discoveries with the Odin-1, Rosebay-1, Lowry South, Liger-1 and Chimera-1 discoveries reported for the year. Thirty-one appraisal wells were drilled for the year with significant activity in the Northern Perth Basin, Cooper-Eromanga Basin and Bowen-Surat Basins. Exploration and appraisal drilling also continued in the Beetaloo Sub-basin with the drilling of the Tanumbirini-2H, Tanumbirini-3H and Carpentaria-2/2H wells during the year.

REDD+ 사업성 전략 체계를 활용한 베트남 산림협력 가능성 평가

Efforts to reduce greenhouse gas (GHG) emissions and mitigate climate change through forests have been discussed in various ways that focus on the United Nations Framework Convention on Climate Change. Accordingly, Reducing Emission from Deforestation and forest Degradation plus in developing countries (REDD+) was established to provide incentives for GHG sequestration in forest sector. With a growing interest toward REDD+ in the Republic of Korea, this study focused on REDD+ projects which implemented within Vietnam and Korea Forest Service‘s project implemented countries. The tropical forests in these countries were compared and analyzed as project strategy systems. First, when analyzing the REDD+ project by nations (Vietnam surrounding countries Indonesia, Cambodia, Myanmar, Lao People

Machine learning models for estimating above ground biomass of fast growing trees

Biomass is a renewable and sustainable energy resource that can potentially be substituted for fossil fuels, which have a negative impact on the environment including the production of greenhouse gas (GHG) emissions. Forest carbon stocks are also of growing interest with regard to both GHG sequestration and renewable energy supply; fast-growing trees are of particular interest in this area. Producing a highly accurate estimation of the above-ground biomass (AGB) of any forest plantation is challenging. In this study, we apply machine learning (ML) techniques to model the AGB of fast-growing trees, namely E. camaldulensis, A. hybrid, and L. leucocephala. It is found that the random forest algorithm has the highest prediction accuracy (R2 of over 0.95, and normalized root mean square error of about 0.20), when compared to other ML algorithms and traditional allometric equations for estimating AGB. This work offers an alternative of estimating AGB for the tropical fast growing trees through the synergy of simple tree characteristics and modeling algorithms.

Urban Sustainable Development Index: a geospatial approach to add Tree Cover to HDI in São Paulo City

Human Development Index (HDI) has become an important tool to measure the basics aspects of human quality of living, being based on educational, economic and longevity dimensions. Over the years, criticism about the absence of an environmental dimension has emerged together with the need for knowledge about sustainable development at a local scale. For these reasons, this paper proposes a new approach for HDI, the Urban Sustainable Development Index (USDI), adding a Tree Cover indicator based on the most accepted criteria of 30% of tree cover to provide high quality of life and kept the balance between the other three dimensions of HDI. The normalized and weighted proposed index showed to be a promising alternative to complement existing sustainable indices impractical at local scale, mainly because they are based on carbon emission measurements. A Tree Cover indicator is more comprehensive, assessing greenhouse gases sequestration, heat islands attenuation, flora preservation, sustenance of fauna habitat, mitigation of extreme weather events and maintenance of water resources and soil stability. The case study in São Paulo city indicated that the transition from HDI to USDI resulted in a negative variation of almost 0.12, mostly in city central regions, and an increase up to 0.08 in peripherical regions - revealing how powerful can be geospatial analysis at a local scale, considering that USDI differs from the spatial distribution of HDI, valuing the importance of a sustainable urban index.

Global climate and soil cover in Russia: function and role of the carbon landfill

One of the most discussed problems of the civilized world of the 21st century is the global climate and the world economy, their importance and influence on the problems of ensuring the environmental safety of the entire globe. This overview article is considering the EU’s announcement of the introduction of a carbon tax on imported goods and Russia’s readiness to develop suitable (unified) methods for calculating the CO2 absorption capacity of the environment, which would be recognized by the world community, as well as the National System for accounting for greenhouse gas emissions by ecosystems (forest, steppe, tundra, farmland, bodies of water, etc.). Moreover, this article notes the importance of studying the emission and sequestration of greenhouse gases (creation of carbon landfills, farms) by different types of soils, the importance of which is characterized by the upcoming “carbon tax” on products exported outside our country.

Решение проблемы изменения климата на планете. Возможный сценарий развития газои нефтедобычи в России

A new scenario for the development of gas and oil production is proposed, based on the use of greenhouse gas sequestration projects that allow increasing the oil recovery coefficient of reservoirs depleted by flooding, ensuring the production of viscous, shale, and hard-to-recover oil, as well as starting the production of methane from its hydrates or from coal. The main idea of the article is that oil and gas production and sequestration of greenhouse gases are not antagonists. Reducing greenhouse gas emissions is possible through the use of natural gas, which is an environmentally friendly fuel. It is necessary to involve huge reserves of methane hydrate or coal methane in the development while using collectors for sequestration of CO2. To improve the economy of sequestration projects, it is proposed to abandon the simultaneous commissioning of the entire technological chain of greenhouse gas sequestration and the use (where possible) of a high degree of concentration; it is recommended to pump greenhouse gas in the form of a water-gas mixture with pumping and booster units; for sequestration, first of all, use reservoirs with hard-to-recover oil reserves.

A Comprehensive Study on the Process of Greenhouse Gas Sequestration Based on a Microporous Media Model

Carbon dioxide geological sequestration is an effective method to reduce the content of greenhouse gases in the atmosphere of our planet. This process can also be used to improve the production of oil reservoirs by mixing carbon dioxide and crude oil. In the present study, a differential separation experiment (DL) based on actual crude oil components is used to simulate such a process. The results show that after mixing, the viscosity and density of reservoir fluid decrease and the volume coefficient increase, indicating that the pre buried gas induces fluid expansion and an improvement of the fluid rheological properties. These effects are interpreted using a pore scale model based on real scanning electron microscopy (SEM). The results show that increasing the pressure and reducing the viscosity are beneficial to increasing the micro oil displacement efficiency. Moreover, these effects can improve the production in the target area and slow down the decline of the formation pressure. Furthermore, in the case of fracture development in the reservoir (due to CO2 injection before exploitation), the risk of gas channelling, induced by the displacement pressure difference between injection and production wells, is avoided.

Effect of the Addition of Agribusiness and Industrial Wastes as a Partial Substitution of Portland Cement for the Carbonation of Mortars.

The present research work shows the effect on the carbonation of Portland cement-based mortars (PC) with the addition of green materials, specifically residues from two groups: agricultural and industrial wastes, and minerals and fibres. These materials have the purpose of helping with the waste disposal, recycling, and improving the durability of concrete structures. The specimens used for the research were elaborated with CPC 30R RS, according to the Mexican standard NMX-C-414, which is equivalent to the international ASTM C150. The aggregates were taken from the rivers Lerma and Huajumbaro, in the State of Michoacan, Mexico, and the water/cement relation was 1:1 in weight. The carbonation analyses were performed with cylinder specimens in an accelerated carbonation test chamber with conditions of 65 +/− 5% of humidity and 25 +/− 2 °C temperature. The results showed that depending on the PC substitutions, the carbonation front advance of the specimens can increase or decrease. It is highlighted that the charcoal ashes, blast-furnace slags, and natural perlite helped to reduce the carbonation advance compared to the control samples, consequently, they contributed to the durability of concrete structures. Conversely, the sugarcane bagasse ash, brick manufacturing ash, bottom ash, coal, expanded perlite, metakaolin, and opuntia ficus-indica dehydrated fibres additions increased the velocity of carbonation front, helping with the sequestration of greenhouse gases, such as CO2, and reducing environmental pollution.

Usage of hemp and vetiver blended with lime as natural additives to reduce greenhouse gas emissions

This research demonstrates the neutrality of greenhouse gases with the application of hemp blessed as a simple natural filler for fabric materials, which absorbs greenhouse gaseous like CO2, CO and NOx. Notably in our research hempcrete drafted as heat-insulating dressing material throughout the load-bearing core of panel structures, Hemp,chrysopogen zizanoides used in homes with the extension of bonding bicomponent (hydraulic lime). Our research focusses on Lime-hemp, a lime-vetiver matter, an innovative idea and heat-insulating substance that enhanced greenhouse gas sequestration and enhance heat insulation like artificial materials. It gives super fragrance along its lifetime, Hempcrete is a mixture of hemp, lime hydrate, and water. This is recyclable stuff that contributes tremendous warmth and sound insulation. The most significant fact in the improvement is that it accelerates the setting of lime. Specifically, Hempcrete develops rather swiftly to absorb greenhouse gases, enhance heat insulation. Our main objective was achieved in this novel research by natural additives when blended with lime with around 96% greenhouse gas sequestration from panels made by natural additives. The emissions are checked with AVL 5 gas analyser and the temperature of the materials during the operation by IR temperature gun. It is also observed thatt by using these panels, we can enhance the heat insulation also which is an additional advantage of using the natural additives.

Low-permeability reservoir sample wettability characterization at multiple scales: Pore-, micro- and macro-contact angles

Wettability, characterized by contact angle (θ), determines fluid distribution/migration in low-permeability (‘unconventional’) hydrocarbon reservoirs. However, θ is a scale-dependent parameter, i.e., pore- (θpore), micro- (θmicro) and macro- (θmacro) contact angles can vary substantially. Therefore, herein, θpore was estimated using a new theoretical model applied to nanoliter droplet imbibition dynamics. θmicro was measured inside an environmental scanning electron microscope through sessile nanoliter droplets; θmacro was quantified at ambient conditions through sessile microliter droplets. The effect of nanoliter droplet size on low-permeability rock wettability was also studied. Results demonstrate that: 1) θpore >θmicro >θmacro; 2) θmicro reflects local wettability heterogeneity better than θmacro; 3) a larger droplet size causes a greater θmicro for weakly water-wet low-permeability rocks, while there is no clear relationship between droplet size and θmicro for strongly water-wet low-permeability rocks. Studies of this nature can be used to evaluate the controls on multi-phase flow in unconventional hydrocarbon reservoirs as applied to hydrocarbon extraction or greenhouse gas sequestration.

Thermal conductivity of undisturbed soil – Measurements and predictions

Soil thermal conductivity, λ, is decisive for a range of soil ecosystem services related to soil temperature. Soil functions affected by temperature comprise microbial as well as abiotic processes of importance to crop growth, leaching of nutrients, carbon sequestration, and emission of greenhouse gases. Models for crop production and climate change include λ for simulation of heat transfer in the natural environment. Nevertheless, most prediction equations for λ are based on measurements deriving from physically disturbed soil. We identified nine Danish soils with a gradient in clay from ~ 0.03 to 0.35 kg kg−1 and measured λ in situ at six soil depths from 5 to 85 cm with the heat pulse method. Soil cores were collected and used for measurements of λ at a range of moisture conditions in the laboratory. The degree of soil water saturation, S, ranged from 0.01 to 0.98, and measured λ was in the range 0.18–2.98 W m−1 K−1. A model for λ identified by multiple regression across all laboratory measurements explained 87% of the variation in data and pointed out a convex polynomial relation between S and λ. It included significant positive effects of bulk density (BD) and soil organic matter (SOM), while λ decreased with soil clay content for a given S. The stochastic model predicted λ for three independent data sets from the literature with little bias and root mean square errors in the range 0.15–0.23 W m−1 K−1. A polynomial regression of λ versus S was performed for combinations of site and soil depth. By this λ was estimated at completely dry conditions, λdry, and at the fully saturated state, λsat. The estimates of λdry as well as λsat had a wider range than reported in the literature. This study calls for re-evaluation of existing pedotransfer functions for λdry. Measurements of λ in soil of undisturbed structural conditions are encouraged.

Assessing the Impact of Greenhouse Gas Emissions on Economic Profitability of Arable, Forestry, and Silvoarable Systems

This study assesses the greenhouse gas (GHG) emissions and sequestration of a silvoarable system with poplar trees and a crop rotation of wheat, barley, and oilseed rape and compares this with a rotation of the same arable crops and a poplar plantation. The Farm-SAFE model, a financial model of arable, forestry, and silvoarable systems, was modified to account for life-cycle greenhouse gas emissions. Greenhouse gas emissions from tree and crop management were determined from life-cycle inventories and carbon storage benefits from the Yield-SAFE model, which predicts crop and tree yields in arable, forestry, and silvoarable systems. An experimental site in Silsoe in southern England served as a case study. The results showed that the arable system was the most financially profitable system, followed by the silvoarable and then the forestry systems, with equivalent annual values of EUR 560, 450 and 140 ha−1, respectively. When the positive and negative externalities of GHG sequestration and emissions were converted into carbon equivalents and given an economic value, the profitability of the arable systems was altered relative to the forestry and silvoarable systems, although in the analysis, the exact impact depended on the value given to GHG emissions. Market values for carbon resulted in the arable system remaining the most profitable system, albeit at a reduced level. Time series values for carbon proposed by the UK government resulted in forestry being the most profitable system. Hence, the relative benefit of the three systems was highly sensitive to the value that carbon was given in the analysis. This in turn is dependent on the perspective that is given to the analysis.

Molecular dynamics simulations on formation of CO2 hydrate in the presence of metal particles

Understanding and controlling the growth of CO2 hydrates is critical for a variety of industrial applications, such as sequestration of greenhouse gases. Due to the excellent physical and chemical properties, metal nanoclusters are widely used as additives in hydrate experiments. However, little is known about the molecular mechanism of this process. In this study, molecular dynamics (MD) simulation was performed at 260 K and 30 MPa by adding different types of metal particles (Cu, Fe and Ag) and different mass fractions (0.2 wt%, 0.5 wt%, 0.8 wt%, 1.0 wt% and 1.3 wt%) to study the growth kinetics of the CO2 hydrate system containing pre-placed hydrate crystal cells. Simulation results showed that the presence of these metal particles has a mixed effect on the growth kinetics, and the extent of the effect seems to varies with different additives and also with the concentration of the metal particles used. It was observed that Cu particles had the most obvious promoting effect on hydrate growth. When the mass fraction of Cu particles was between 0.2 wt% and 1.0 wt%, the rate of hydrate formation increased, especially at the mass fraction of 1.0 wt%. The growth rate of CO2 hydrate was almost 50% higher than that of pure water system at this concentration. In addition, Fe particles had a medium effect on promoting CO2 hydrate growth. Ag particles had no obvious effect on CO2 hydrate growth. Results show that the addition of metal particles with high specific surface areas greatly increases the mass and heat transfer among the gas, liquid and hydrate phases, which is conducive to the growth of CO2 hydrate.

Recovery of N2O: Energy-Efficient and Structure-Driven Clathrate-Based Greenhouse Gas Separation.

N2O has 300 times more global warming potential than CO2 and is also one of the main stratospheric ozone-depleting substances emitted by human activities such as agriculture, industry, and the combustion of fossil fuels and solid waste. We present here an energy-efficient clathrate-based greenhouse gas-separation (CBGS) technology that can operate at room temperature for selectively recovering N2O from gas mixtures. Clathrate formation between α-form/β-form hydroquinone (α-HQ/β-HQ) and gas mixtures reveals guest-specific and structure-driven selectivity, revealing the preferential capture of N2O in β-HQ and the molecular sieving characteristics of α-HQ. With a maximum gas storage capacity and cage occupancy of 54.1 cm3 g-1 and 0.86, respectively, HQ clathrate compounds including N2O are stable at room temperature and atmospheric pressure and thus can be easily synthesized, treated, and recycled via commercial CBGS processes. High selectivity for N2O recovery was observed during β-HQ clathrate formation from N2O/N2 gas mixtures with N2O concentrations exceeding 20%, whereas α-HQ traps only N2 molecules from gas mixtures. Full characterization using X-ray diffraction, scanning electron microscopy, Raman spectroscopy, solid-state nuclear magnetic resonance, and compositional analysis and the formation kinetics of HQ clathrates was conducted to verify the peculiar selectivity behavior and to design the conceptual CBGS process. These results provide a new playground on which to tailor host-guest materials and develop commercial processes for the recovery and/or sequestration of greenhouse gases.