Catalysts For Reforming Research Articles

First comparison of the catalytic stability of cobalt metal, nitride and phosphide catalysts for dry reforming of methane

For the first time, the catalytic stability of cobalt metal, nitride, and phosphide phases supported on MgO was compared for dry reforming of methane. The initial CH4 conversions for Co/MgO, Co4N/MgO, and Co2P/MgO catalysts were 88.1, 87.7 and 86.0%, respectively. However, after 15 h of testing, these values gradually decreased to 69.9, 75.0 and 79.4%, respectively. The Co2P catalyst demonstrated superior stability compared to the Co and Co4N catalysts. The enhanced stability of the Co2P/MgO catalyst was attributed to its smaller particle size and a lower ratio of CH4 and CO2 dissociation rates.

Redefining equality in European contract law: protecting consumer interests in a post-consumer society

Abstract Consumers have in law been defined as the weaker parties in a transaction. Contract laws have integrated consumer protection with a view to balancing the interests of the parties, ensuring equal bargaining power and to some extent substantive fairness in contractual relations. Rules of consumer protection have therefore, from a contract lawyer’s perspective, been construed as expressions of a general principle of equality. The principle of equality, conceived in this way, complements the general principle of autonomy underlying contract law, which embodies the idea that parties should have the capacity for self-realisation. Does this construction of consumer contract law still hold in EU consumer markets transformed by the rise of online platforms and the overall move towards an economy based on services and experiences rather than the sale of physical goods? Or do we need to redefine the ways in which the principle of equality is expressed in European contract law in order to correct for new inequalities arising between consumers and businesses? This article aims to answer that question against the backdrop of established insights of the ways in which the rationality of European contract law differs from that of national, doctrinal private law systems. It concludes that the rules laid down in instruments such as the Unfair Commercial Practices Directive (UCPD) and the Unfair Contract Terms Directive (UCTD) can protect consumers against exploitative practices. However, problems arise in cases where the interest at stake go beyond economic interests and concern also non-economic interests, such as data protection or freedom of expression, or do not have a market exchange value. Solutions can be pursued, it is submitted, by the European legislator and the European Court of Justice, potentially using the EU Charter of Fundamental Rights as a catalyst for reform.

Gazeta Matematică

This study examines Gazeta Matematică's (GM) influence on mathematics education in Romania from 1895-1945. Analyzing 13 articles from GM's archives, this research explores discussions on mathematics methodology and didactic issues and highlights Ion Ionescu’s contributions. Findings reveal tensions between idealized rigorous pedagogy and practical classroom challenges. The study highlights GM’s dual role as a mirror reflecting the complexities of mathematics education in a modernizing Romania and as a catalyst for educational reform. It demonstrates GM's significance in fostering mathematical discourse and provides insights into evolving priorities and attitudes toward mathematics instruction during a period of significant social and political transformation.

Nickel-Based Catalysts for Dry Reforming of Methane in the Absence/Presence of H2S: Effect of SiO2 and Cu

Nickel-Based Catalysts for Dry Reforming of Methane in the Absence/Presence of H₂S: Effect of SiO₂ and Cu

On the catalytic nature of nitrided NiMo/γ-Al2O3 catalysts for dry reforming of methane

Nitrogen and phosphorus are one of the most common Group 15 elements. The chemistry of nitrogen and phosphorus is very important in the field of catalysis. Three types of nitride containing NiMo/γ-Al2O3 catalysts were synthesized using different loading-nitriding sequences and oxide precursor types for dry reforming of methane (DRM). The active components (Ni2Mo3N and Ni/Mo2N) firstly reacted with CO2, transforming into NiO and MoO2. They were then carburized with CH4 to produce Ni/Mo2C during the DRM process. From that point on, a redox cycle, viz. NiO/MoO2 ⇆ Ni/Mo2C, occurred during the DRM reaction. The low activity of nitriding-first NiMo nitride catalyst can be attributed to bulk oxidation. The observed gradual decline in performance of loading-first Ni/Mo nitride catalyst was due to coking. Noticeably, the loading-first NiMo nitride catalyst can demonstrate superiority in both activity and resistance to coking, which was due to its strong metal–Al2O3 interaction and high metal dispersion.

Shaping sustainable solutions in fashion through design-led strategies, approaches, and practices

Today, growing concerns about the Earth's finite resources and escalating climate challenges have sparked a reassessment of industrial processes. This has led to a call for a more responsible and transparent approach across various sectors. The global conversation prominently revolves around sustainable development to foster diversity within a comprehensive framework to effectively address UNESCO's four pillars of sustainability: Environment, economy, society, and culture. The fashion industry, a highly significant and influential sector, has proven to be invasive due to resource-intensive processes that impact both the environment and the economy. Additionally, the industry's rich cultural content plays a substantial role in shaping social and cultural shifts. In this context, this article focuses on design as a catalyst for reform within the fashion industry's supply and value chain, steering it towards sustainability. The focus is on exploring emerging responsible practices aligned with evolving priorities, aspirations, and lifestyles to foster a systemic approach to sustainability in fashion. The discussion highlights design-led perspectives that support a sustainable transition, underscoring the necessity for a transformative mindset among designers. This involves adopting innovative strategies to promote responsible approaches and practices for contributing to a more sustainable future.

Highly porous Ni/MgO-ZrO2 catalysts for dry reforming of methane and the effects of MgO addition on the mechanisms

Dry reforming of methane (DRM) is a promising pathway to convert greenhouse gas into syngas. However, the commonly used Ni based catalysts suffer deactivation due to severe sintering and coking. In this paper, a series of porous Ni/MgO-ZrO2 catalysts (5Ni/xM(1-x)Z, x = 0, 20, 40, 60, 80 wt%, respectively) with high specific surface area were synthesized by a facile combustion method followed by incipient impregnation. It is found that the appropriate amount of MgO (40 %) addition in ZrO2 favors high porosity and high specific area. More MgO enhances the basicity of the catalyst as well as the metal-support interaction (MSI) by the formation of NiO-MgO solid solution, thus improving DRM activity and coking resistance. However, excessive MgO addition leads to over-strong MSI and lower porosity, resulting in lower DRM activity. The catalyst with 40 % MgO addition (5Ni/40M60Z) exhibits the best activity (conversions of CH4 ∼ 76 %, CO2 ∼ 83 %) and stability (>50 h) at high GHSV = 96000 ml/gcat·h and 750 °C. in situ DRIFTS reveals the mechanism that MgO addition improves DRM activity and stability. Compared with ZrO2 where CO2 adsorbs as monodentate carbonate, CO2 tends to adsorb on 40 %MgO-60 %ZrO2 as bidentate carbonate and then easily transfer to more stable intermediate bidentate formate, thus improving DRM activity and coking resistance. This study provides new insights on the role of Mg addition in Ni/MgO-ZrO2 DRM catalysts.

Steam reforming of toluene as model compounds of biomass tar by Fe–K-based biochar nano-catalysts at mild temperatures

Development of efficient catalysts for steam reforming of biomass tar is crucial for the widespread application of biomass gasification. In this work, a novel biochar nano-catalyst (BN) is conveniently prepared via one-step catalytic pyrolysis, using K and Fe to adjust the surface structure of the biochar, thereby enhancing the activity for toluene reforming. Fe–K/BN is tested in a fixed-bed reactor for steam reforming of toluene, a model compound of biomass tar, achieving a 100% toluene conversion rate at 650 °C. Fe–K/BN is activated in situ with steam to increase their specific surface area and enhance the O-containing functional groups on the surface, improving toluene adsorption and reforming. Finally, the stability of Fe–K/BN is tested in the simulated syngas, maintaining a 100% toluene conversion rate during a 26-h continuous catalytic reforming experiment. This work provides a promising strategy for the design of an active and stable catalyst for toluene reforming, which has potential for application of tar steam reforming during biomass gasification.

World Health Organization Guidance on Health Practitioner Regulation: An Overview

ABSTRACT: The World Health Organization has released its first comprehensive Guidance document on health practitioner regulation, addressing a critical gap in global health policy. This Commentary provides an overview of the Guidance, which aims to support countries in strengthening their regulatory systems for health practitioners. The Guidance, developed through a rigorous process involving a literature review and expert consultation, covers a broad range of health practitioners and focuses on optimizing their utilization to meet population health needs. Key highlights include the description of the global regulatory landscape, identification of regulatory challenges in all societies, and policy considerations to realize dynamic, effective, and agile regulation. The COVID-19 pandemic is cited as an important example of a catalyst for regulatory reforms that enhanced workforce availability and access. This paper, co-authored by members of the World Health Organization Technical Expert Group, emphasizes the importance of aligning regulatory systems with broader health workforce and system priorities, adopting a risk-based approach, and addressing implementation gaps. It encourages policymakers, regulators, and researchers to use the Guidance to assess and update their regulatory systems and to generate more robust evidence on the impact of health practitioner regulation on health outcomes.

Favorable formation of needle-shaped NiAl2O4 phase over macroporous Ni/CexZr1-xO2–Al2O3 catalysts in one-pot preparation and coke-resistant catalytic performance in dry reforming of methane

In this study, we report the formation of needle-shaped NiAl2O4 via favorable interactions between Ni and Al species over macroporous Ni/CexZr1-xO2–Al2O3 catalysts for dry reforming of methane (DRM) and its remarkable improvement in the catalytic performance. The macroporous catalysts prepared by a one-pot (OP) method promote a favorable interaction between Ni and Al species that results in the formation of unique needle-shaped NiAl2O4 due to easy access to each other compared with that by incipient wetness impregnation. The NiAl2O4 phase in the calcined catalysts transforms into highly dispersed Ni and defective Al2O3 via the Ni exsolution in the reduction step. The presence of oxygen vacancies near Ni0 species facilitates the CO2 activation and enhances the catalyst stability over DRM. The optimized distribution of active sites with abundant defects over macroporous Ni/CexZr1-xO2-Al2O3 catalysts (OP) result in high conversions of CH4 and CO2 and a low coking rate in DRM.

Incidence of Non-Communicable Diseases and Out-of-Pocket Expenditure among Senior Elderly of five Districts in Kerala

Background: The nation's healthcare system, which is already struggling with constraints, faces a significant challenge from India's growing elderly population. As the prevalence of non-communicable diseases (NCDs) rises among this demographic, concerns mount over the strain on healthcare services. Objective: the study's primary aim was to evaluate the incidence of NCDs and the financial burden of out-of-pocket expenses associated with hospital stays for the middle-aged and older segments of the population. Methods: The referenced study, employing a systematic random sampling method, sought to gather pertinent data within Kerala—a state in southern India. Conducted across five specific districts. Results: The findings from a sample of 500 individuals revealed that 45% were afflicted with NCDs. Notably, a significant majority of these patients, irrespective of their economic status, opted for private healthcare providers, accounting for 60.5% of the respondents. This preference underscores the perceived or actual disparities in the quality of care between private and public healthcare institutions. Conclusions: The study's insights are crucial in understanding the healthcare dynamics at play and could serve as a catalyst for policy reform, aiming to enhance the accessibility and affordability of healthcare for India's aging population. It also highlights the urgent need for a robust healthcare system that can accommodate the complex needs of the elderly, particularly in managing chronic conditions that require long-term care and substantial financial resources. Way ahead: Utilising frontline staff (ANMs and ASHAs) can assist in putting NCD interventions into practice at the community level.

Effect of Ga-Promoted on Ni/Zr + Al2O3 Catalysts for Enhanced CO2 Reforming and Process Optimization

AbstractIn this study, zirconia-modified alumina support (S) was used to investigate Ga-promoted Ni catalysts for dry reforming of methane (DRM). The catalysts (Ni + (0–3) wt% Ga/S) were prepared using the wet impregnation method and calcined at 700 °C for 3 h. The inclusion of Ga enhanced the surface area, basicity, and metal-support interaction of the Ni-Ga/S catalysts. Smaller Ni particles containing Ga were seen in the TEM. The most active and stable catalyst was Ni + 2.0 Ga/S, having a conversion of 35% CO2 and 28% CH4 at 600 °C and displaying less (17%) carbon deposition. Furthermore, the DRM process was optimized by a mathematical model. The model determined the optimal conditions as follows: temperature (800 °C), gas flow rate (GHSV—30,000 ml h−1gcat−1), and methane to carbon dioxide ratio (1:1). The model predicts CH4 and CO2 conversions of 76.76% and 82.0%, respectively, and an H2/CO ratio of 1.02, compared to experimental results showing CH4 conversion at 74.56%, CO2 conversion at 83.25%, and an H2/CO ratio of 1.01. The model demonstrates excellent agreement with the experimental observations, exhibiting less than 3% error. Graphical Abstract

Catalytic Reactivity Assessment of AgM and CuM (M = Cr, Fe) Catalysts for Dry Reforming of Methane Process with CO2.

CuM and AgM (M = Cr, Fe) catalysts were synthesized, characterized, and evaluated in methane reforming with CO2 with and without pretreatment under a H2 atmosphere. Their textural and structural characteristics were evaluated using various physicochemical methods, including XRD, B.E.T., SEM-EDS, XPS, and H2-TPR. It was shown that the nature of the species has a significant effect on these structural, textural, and reactivity properties. AgCr catalysts, presenting several oxidation states (Ag0, Ag+1, Cr3+, and Cr6+ in Ag, AgCrO2, and AgCr2O4), showed the most interesting catalytic performance in their composition. The intermediate Cr2O3 phase, formed during the catalytic reaction, played an important role as a catalytic precursor in the in situ production of highly dispersed nanoparticles, being less prone to coke formation in spite of the severe reaction conditions. In contrast, the AgFe catalyst showed low activity and a low selectivity for DRM in the explored temperature range, due to a significant contribution of the reverse water-gas shift reaction, which accounted for the low H2/CO ratios.

Highly Stable Ni-B/Honeycomb-Structural Al2O3 Catalysts for Dry Reforming of Methane.

Two-component catalysts have garnered significant attention in the field of catalysis due to their ability to inhibit Ni sintering. In the present work, honeycomb-structuralstructured Al2O3-supported Ni and B were prepared to enhance coke tolerance during dry reforming of methane (DRM). Transmission electron microscopy (TEM) results revealed that the average particle sizes on Ni/Al2O3 and Ni-0.16B/Al2O3 were 7.6 nm and 4.2 nm, respectively, indicating that B can effectively inhibit Ni sintering. After a 100-hour reaction, the conversion of CH4 and CO2 on Ni/Al2O3 decreased by approximately 5 %, whereas on Ni-0.16B/Al2O3, there was no significant decrease in CH4 and CO2 conversion, with values of approximately 81.6 % and 87.2 %, respectively. In situ DRIFT spectra demonstrated that Ni-0.16B/Al2O3 enhanced the activation of CO2, thus improving the catalyst's stability. A Langmuir-Hinshelwood-Hougen-Watson (LHHW) model was developed for intrinsic kinetics, and the resulting kinetic expressions were well-fitted fit to the experimental data, with R2 values exceeding 0.9. ActivationThe activation energies were also calculated. The outstanding stability of Ni-0.16B/Al2O3 can be attributed to its stable honeycomb structure and B's ability to significantly inhibit Ni sintering, reduce catalyst particle size, and enhance coke tolerance.

Effect of cobalt on the activity of nickel-based/magnesium-substituted hydroxyapatite catalysts for dry reforming of methane

The dry reforming of methane (DRM) reaction can directly convert methane (CH4) and carbon dioxide (CO2) into syngas (H2+CO), which is a promising method for achieving carbon neutralization. In this study, a series of 3Ni-xCo/Mg1HAP alloy catalysts with different ratio were synthesized by the coprecipitation method, and the optimum Ni–Co ratio for the DRM reaction was studied. A series of characterization methods revealed that after Co was added, the formation of Ni–Co alloys increased the interactions between metals. However, an excess of Co inhibits the entry of Ni into the lattice of Mg1HAP, resulting in metal accumulation on the surface of the support. In addition, the introduction of Co improves the dispersion of Ni metal, which endows the catalyst with better catalytic activity and stability. Raman spectroscopy of the catalyst after the stability test showed that the addition of Co reduced the proportion of graphitic carbon, which was also the main reason for its improved stability.

From Protests to Progress: Unlocking the Potential of the Nigerian Youth for Political Reform

In light of persistent political challenges and social unrest in Nigeria, this paper examines the transformative potential of the nation's youth, whose rich history of activism has significantly shaped the country's political landscape. However, despite these historical precedents, contemporary youth engagement remains crucially significant, particularly in light of recent protests that have reverberated across the nation. By examining the historical context of youth activism in Nigeria, this paper elucidates the evolution of past movements and their enduring impact on the country’s political sphere. Furthermore, the paper analyses the contemporary landscape of youth engagement, highlighting the multifaceted nature of recent protests and the underlying catalysts driving them. Of particular significance is the role of social media in mobilizing Nigerian youth, providing a platform for collective action, and amplifying their voices in the public discourse. Despite the undeniable agency demonstrated by Nigerian youth, numerous barriers impede their ability to effect lasting political reform. In response, this paper proposes a strategic framework for empowering Nigerian youth for leadership, encompassing initiatives such as education and awareness campaigns, the creation of spaces for youth representation in government, and the strengthening of youth-led organizations. In conclusion, this paper advocates for sustained attention and investment in empowering Nigerian youth as catalysts for political reform. Recognizing their agency and potential, stakeholders must work collaboratively to foster an environment conducive to meaningful youth engagement and inclusive governance.

Construction of metal-anchored and defect-rich N-doped lignite-char supported cobalt catalysts for pressurized dry reforming of methane

Dry reforming of methane (DRM) offers a promising path for greenhouse gas conversion, but industry usually relies on pressurization conditions, and the drawback of rapid carbon deposition leading to deactivation of conventional catalysts under pressurization has hindered its industrial development. In this study, a cost-effective N-doped Co-based DRM catalyst was developed by utilizing melamine to induce heteroatom doping defects on modified lignite to overcome the problem of deactivation due to rapid carbon deposition under pressurized conditions. The catalyst, Co/CN-40 (Impregnated with 40 wt% melamine), has the smallest metal particle size (3.13 nm), the largest specific surface area (376 m2/g), high defectivity (ID/IG ratio = 0.84), enhanced metal-support interactions and a relatively high pyridine N content (48%). The evaluation of DRM activity and stability at 780 °C and 0.5 MPa demonstrates that Co/CN-40 offers the highest catalytic efficiency. The highest conversion was quickly achieved by the catalyst during activity assessments, and maintain an efficient conversion with suppressed metal agglomeration over a 100-h stability test. These improvements are attributed to the increase in the number of defects which enhances electron transfer, improves metal anchoring and boosts the adsorption and activation of reactant molecules.

Novel Ni–Ru/CeO2 catalysts for low-temperature steam reforming of methane

Upgrading of biogas and biomethane into H2-rich streams by steam reforming is regarded as an effective strategy to reduce fossil fuel consumption contributing to the transition towards a green energy system. In this context, novel reactor configurations such as membrane reactors appear a promising route for process intensification, but they require novel catalysts more active at low temperatures, stable, and resistant to coke formation. In this work, we prepared and tested structured catalysts characterized by a low Ni content (7 wt%) and a very low Ru content (≤1 wt%) supported on ceria and deposed onto SiC monoliths. Catalysts were tested at low temperatures (<600 °C), i.e. at temperatures suitable for applications in Pd-based membrane reactors. Fresh and used catalysts were characterized by ICP-MS, N2 physisorption, XRD, TEM, SEM-EDS, XPS and H2-TPR to identify the physicochemical properties affecting the catalytic activity. The catalysts showed good activity towards methane reforming, stable performance, and good resistance to coke formation. Ruthenium affects both the intrinsic catalytic activity and the resistance to the inhibiting effect of steam on the reaction rate. This is related to improved redox properties due to the intimacy between the active metals and their strong-metal-support-interaction with the ceria. Finally, our catalysts show self-activation under reaction conditions, which is an interesting property for applications.

Catalysts for Reforming of Methane (A Review)

Catalysts for Reforming of Methane (A Review)

Exsolved NiRu bimetallic nanoparticles induced by Ru doping in LaBaMn1.6Ni0.3Ru0.1O5+δ as a coking resistant anode catalyst layer for direct-methane solid oxide fuel cells

Due to its abundant resources and advantages in transportation and storage, methane fueled solid oxide fuel cells (SOFCs) are highly needed. In this work, an exceptional internal reforming catalyst comprising in-situ exsolved NiRu bimetallic nanoparticles and oxygen-deficient layered double perovskite LaBaMn1.6Ni0.3Ru0.1O5+δ (r-LBMNR) was prepared. Compared to the cell with LaBaMn1.6Ni0.4O5+δ (r-LBMN) catalyst, the cell with a Ru-doping r-LBMNR catalyst layer, exhibits superior peak power output of 336 mW cm−2 and better durability with a less decay rate of 0.014% per hour in CH4 fuel. The enhanced electrochemical performance can be attributed to the high oxygen ion and electron conductivities of the catalyst and the coupling of Ni and Ru sites with the oxygen-deficient r-LBMNR matrix This coupling activates CH4 and H2O, promotes the oxidation of C atoms in CH4 molecules, and enables reversible hydrogen spillover, ultimately leading to the production syngas of CO(g) and H2(g).