最新刊期
卷 50 ， 期 3 ， 2025
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摘要：Reduction of CO2 to methanol is an effective pathway for achieving carbon reduction and carbon resource utilization. As the core of the CO₂ to methanol reduction system, the optimization and innovation of reactors are crucial. Three catalytic pathways (thermal catalysis, photocatalysis and electrocatalysis) for reduction of CO2 to methanol were introduced. The research progress on reactors for reduction of CO2 to methanol and their advantages and disadvantages were reviewed, and future research directions and application prospects were discussed. For thermal catalytic reactors, in-situ condensation, in-situ adsorption and membrane separation technologies can be employed to overcome thermodynamic equilibrium limitations and address catalyst deactivation caused by by-product water. However, membranes lack long-term stability under thermal catalytic conditions, making the development of membranes with high thermal and chemical stability essential. Photocatalysis, as a green pathway, holds great application potential, but reactor efficiency is currently low and requires a constant light source. Moreover, poor system stability limits its scalability. Improvements in reactor structure and the development of novel photoactive materials are needed to enhance light utilization and capture, as well as mass transfer. Electrocatalysis operates under mild conditions and can be driven by renewable electricity, offering significant industrial potential. The application of gas diffusion electrodes (GDE) in reactors (electrolyzers) can effectively enhance mass transfer and improve electrode efficiency. However, there are issues such as gas diffusion layer blockage, poor system stability and short membrane lifespan.关键词：CO₂ reduction;methanol;thermal catalysis;photocatalysis;electrocatalysis;reactors40|0|0更新时间：2025-03-27 -
摘要：La2O3 catalysts have been widely used in the oxidative coupling of methane (OCM) reaction, however, identifying the types of key oxygen species and its influence on methane dissociation activity is still a challenge. The oxygen migration, the types of oxygen species formed during oxygen migration and the influence of oxygen species types on methane dissociation activity over Li-doped La2O3 catalysts were investigated by density functional theory (DFT) calculation. The results show that for the Li/Ov-La2O3 catalysts, O2 forms the surface superoxide species -
摘要：The development of high efficiency catalyst is one of the key technologies of hydrogen production by high flux steam reforming of methanol. Using RuCl3 as raw material and CeO2 as support, Ru/CeO2 catalysts were prepared by deposition-precipitation method. The properties of the catalysts were analyzed by XRD, N2 adsorption/desorption, H2-TPR and XPS, and the effect of calcination temperature on the catalytic performance of the catalysts in high flux steam reforming of methanol for hydrogen production was investigated. The results show that with the increase of calcination temperature, the reducing performance of RuOx species increases first and then decreases, and the surface oxygen vacancy relative content increases first and then decreases. Among them, RuOx species in Ru/CeO2-500 catalyst have stronger reducing performance, higher surface oxygen vacancy relative content on the catalyst surface, and better catalytic activity. The methanol conversion rate of Ru/CeO2-500 catalyst is 91.8% under the conditions of reaction temperature of 420 ℃, mole ratio of water and alcohol of 1.2:1.0 and weight hourly space velocity of methanol and water of 6.0 h-1.关键词：methanol conversion;Ru/CeO2 catalysts;calcination temperature;steam reforming of methanol108|0|0更新时间：2025-03-27 -
摘要：Hydrogenation of dimethyl oxalate (DMO) to ethylene glycol (EG) represents a pivotal step in EG production from coal-based syngas. This process is of great significance for replacing traditional petroleum-derived route to produce EG and achieving high value-added conversion of coal. Efficient and stable catalysts for catalytic hydrogenation of DMO to EG are crucial for promoting the further development of coal-based syngas for EG production. Cu-1,3,5-phenyltricarboxylic acid metal organic framework (Cu-BTC MOF) was used as a precursor and calcined under N2 atmosphere at different temperatures to obtain Cu@C-x (x is the calcination temperature) catalysts, and Cu@C-x catalysts were used to catalyze the hydrogenation of DMO to EG. The catalysts were characterized by XRD, SEM, H2-TPR, XPS and N2 physical adsorption/desorption. The effects of calcination temperatures on phase compositions, morphologies, reduction performances surface element compositions and texture properties were also investigated. The results show that calcination temperatures change the interaction between Cu species and the carbon support (Cu—O—C), thereby significantly affecting the Cu particles sizes and n(Cu+)/n(Cu0 + Cu+). Thanks to the moderate interaction between Cu species and the carbon support, Cu@C-500 catalyst has the smallest Cu particle size and largest n(Cu+)/n(Cu0 + Cu+). Under the reaction conditions of 240 ℃, 2.5 MPa, weight hourly space velocity of 0.2 h-1 and n(H2)/n(DMO) of 200, Cu@C-500 catalyst achieves the DMO conversion rate of 100% and EG selectivity of 94.13%, and no deactivation occurs within 250 h.关键词：MOF;Cu catalyst;dimethyl oxalate;ethylene glycol;calcination temperatures169|0|0更新时间：2025-03-27 -
摘要：Ethane dry reforming is one of the important ways to realize CO2 utilization. Ni-based catalysts are widely used in ethane dry reforming reactions due to their characteristics of low costs and high catalytic activities. However, the mechanism of ethane dry reforming is still unclear, which restricts the development of high-efficienct Ni-based catalysts. Using the sol-gel method, Ni-based catalysts with nickel mass fractions of 5% and 10% (5%Ni/Al2O3-CeO2 and 10%Ni/Al2O3-CeO2), respectively, were prepared. The effects of the reactants partial pressures ( -
摘要：Methyl glycolate (MG), as a key raw material for the production of degradable plastic polyethylene glycol acid, has broad market space and high economic value. Hydrogenation of dimethyl oxalate (DMO) to MG is one of the ways to realize the conversion and value-added utilization of coal and natural gas resources. However, MG is the product of unsaturated hydrogenation of DMO, and the existing catalysts are difficult to achieve its efficient preparation. Although Cu-based catalysts are widely used in DMO hydrogenation, they are more inclined to catalyze deep hydrogenation of DMO. Alk-Ti3C2 MXene supports were prepared through alkali treatment using two-dimensional layered Ti3C2 MXene as the support, and alk-Ti3C2 MXene supported Cu-based catalyst was prepared by ultrasonic impregnation method. The results show that the alkali treatment can not only increase the interlayer spacing (from 1.02 nm to about 1.25 nm) and surface area of the supports (from 3.61 m2/g to more than 7.10 m2/g), but also increase the number of —OH on the support surface, thereby regulating the interaction between —OH on the support surface and Cu species, ultimately affecting the particle size and valence state composition of Cu species. It is worth mentioning that the Cu/Na-Ti3C2 MXene catalyst supported on Na-Ti3C2 MXene after NaOH treatment shows good catalytic performance and stability. The MG yield is up to 60.63% (reaction time of 26 h) and no deactivation occurs within 230 h. The relatively suitable Cu particle size (43.4 nm), high n(Cu0)/n(Cu0 + Cu+) (71.17%) and the strong interaction between Cu species and the surface —OH on the support together endow the Cu/Na-Ti3C2 MXene catalyst with good catalytic performance and stability.关键词：Ti3C2 MXene;dimethyl oxalate hydrogenation;Cu-based catalyst;methyl glycolate;metal-support interaction108|0|0更新时间：2025-03-27 -
摘要：Against the backdrop of a significant increase in household waste and rising energy demand, converting household waste into energy is a viable win-win solution. Compared with traditional combustion, refuse-derived fuel (RDF) gasification converts difficult-to-use solid waste into syngas that can be easily catalytically converted, and the emission of harmful substances such as fly ash and dioxins is significantly reduced, which has great development potential and application prospects. Gasification efficiency and economy are key factors for the large-scale utilization of RDF gasification, so the selection of appropriate gasification technology and the control of key influencing factors are very important. The RDF classification and preparation methods, composition characteristics, research hotspots and gasification principles were introduced, and the advantages and disadvantages of typical RDF gasification technologies were summarized, and the influences of raw material compositions, gasification temperatures, gasification mediums, equivalent ratios, catalyst types and conditions of use and other factors on RDF gasification were analyzed. Fixed-bed gasification technology is suitable for small-scale gasification stations and cogeneration, and fluidized bed gasification technology is suitable for large-scale industrial synthesis process, and plasma gasification technology is suitable for treating hazardous waste. The improvement of RDF gasification efficiency and syngas quality can be achieved by optimizing the compositions of raw materials, selecting appropriate gasification medium and catalysts, and adjusting the reaction conditions. Future research can focus on developing new and efficient RDF gasification technologies, optimizing RDF gasification process control strategies, and integrating RDF gasification with other energy systems.关键词：household waste;refuse-derived fuel;gasification technology;influencing factors121|0|0更新时间：2025-03-27 -
摘要：In order to achieve “carbon peaking and carbon neutrality goals”, the efficient catalytic hydrogenation of low-carbon compounds to realize their high-value utilization and the preparation of nitrogen-doped carbon materials from biomass, which is widely available and renewable, as a feedstock for the catalytic hydrogenation reaction are the hot spots of current research. However, the complexity of biomass leads to the large differences in the surface properties and structural characteristics of carbon materials when preparing nitrogen-doped biochar, and the industrial application of nitrogen-doped biomass carbon materials in the field of catalytic hydrogenation is still a big challenge. The research on the preparation of nitrogen-doped biomass carbon materials and their use as catalyst carriers in hydrogenation was reviewed. Firstly, the types and properties of nitrogen-doped species and the typical preparation methods of nitrogen-doped biomass carbon materials were described. Secondly, the research progress on nitrogen-doped biomass carbon materials in catalytic hydrogenation reactions at home and abroad in recent years was summarized by comparing them with other catalyst carriers. Finally, the future development trends of nitrogen-doped biomass carbon materials used in the field of catalytic hydrogenation were prospected, with the aim of providing references for promoting the progress on nitrogen-doped biomass carbon materials in the field of catalytic hydrogenation.关键词：biomass;nitrogen doping;carbon materials;catalyst carrier;catalyst;hydrogenation136|0|0更新时间：2025-03-27 -
摘要：The moisture content of blue-green algae is over 99%. when using thermochemical treatment methods such as pyrolysis, it is necessary to dry and pretreat the blue-green algae, which consumes a high amount of energy. To address this issue, hydrothermal carbonization (HTC) was applied to blue-green algae with a moisture content of 92.94%. The effects of hydrothermal temperature (180 ℃ to 260 ℃), holding time (0 h to 3 h), and heating rate (1 ℃/min and 1 ℃/6 min) on the fuel properties and combustion behavior of the resultant hydrochar were studied. The results indicate that HTC treatment reduces the volatile content of algae by 9.92% to 29.13%, increases ash content by 8.54% to 25.52%, and enhances fixed carbon content by 0.82% to 5.26%. Combustion of hydrochar from blue-green algae occurs in three stages: dehydration, volatile release, and combustion of volatiles and fixed carbon. HTC treatment elevates the ignition temperature (505 K to 583 K) and burnout temperature (747 K to 812 K), which improves the storage and transport properties of the material. Kinetic analysis shows that the volatile release and its combustion stage follows a first-order reaction with an activation energy of 27.82 kJ/mol to 66.04 kJ/mol, while the fixed carbon combustion stage follows a second-order reaction with an activation energy of 38.65 kJ/mol to 65.68 kJ/mol. This study provides a reference for the resource utilization of blue-green algae.关键词：blue-green algae;hydrothermal carbonization;hydrochar;fuel properties;kinetic analysis78|0|0更新时间：2025-03-27 -
摘要：Developing coal-to-oil technology is a strategic measure to ensure national energy security, and coal-to-oil projects are also one of the major sources of carbon emissions in the coal chemical industry. In the context of the “carbon peaking and carbon neutrality goals”, establishing a reasonable carbon emission accounting method for coal-to-oil projects and obtaining accurate carbon emission data is the foundation for integrating the coal-to-oil industry into the national carbon trading market. It is also essential for enterprises to develop carbon reduction plans and compile sustainability and ESG (Environmental, Social and Governance) reports. Based on the current development status of China’s coal-to-oil industry, the significance and value of carbon emission accounting for coal-to-oil projects were analyzed and the current methods for carbon emission accounting were summarized. Existing accounting methods in the chemical industry do not meet the requirements for the comparability of unit product emission intensity in terms of consistency in emission sources, accounting boundaries and product yield statistics. In areas such as carbon emissions from raw material consumption and thermal emissions, the accounting data does not meet the quality requirements necessary for carbon market quota allocation. To address these shortcomings, six recommendations were proposed, including the elimination of the distinction between direct and indirect liquefaction processes in accounting guidelines, exploring joint entity compliance models, selecting carbon mass balance and online continuous monitoring methods depending on the situation, applying product standardization and treatment based on low calorific value, treating externally supplied syngas as a carbon-containing output, and simplified treatment using net thermal energy consumption and default thermal carbon emission factors, aming to provide a reference for the development of carbon emission accounting guidelines and related technical standards for coal-to-oil projects.关键词：coal-to-oil;carbon emission;accounting methods13|0|0更新时间：2025-03-27 -
摘要：To study the economy of different processes of green hydrogen coupled with biomass gasification for green methanol production, three representative processes (catalytic conversion methanol synthesis process, non-catalytic conversion methanol synthesis process and methanol synthesis process with hydrogen extraction from purge gas for recycling) were taken as the research objects. Analyses were conducted on the three processes from fixed asset investments, utility consumptions and total costs, respectively. The results show that the fixed asset investments of catalytic conversion methanol synthesis process, non-catalytic conversion methanol synthesis process and methanol synthesis process with hydrogen extraction from purge gas for recycling decrease in turn. The electrolytic water hydrogen production process is the process with the highest investment in the three processes, and optimizing configuration of the process is the key to reducing investments. The non-catalytic conversion methanol synthesis process has the highest by-product steam output amounts, and heat coupling between the high-temperature gas of biomass gasification syngas and the conversion reaction gas is the key for energy-saving and cost-reducing. Under certain conditions, methanol synthesis process with hydrogen extraction from purge gas for recycling has relative highest economy, and the total cost of the process can lower than 2684.24 CNY/t when the electricity price is reduced to less than 0.2 CNY/(kW·h).关键词：green hydrogen;biomass gasification;catalytic conversion;non-catalytic conversion;green methanol;economic analysis35|0|0更新时间：2025-03-27 -
摘要：The high synthetic cost of nano-silicon restricts the further application of silicon-based solid amine adsorbents. The content of silicon in fly ash is high, so using fly ash as silicon source to reduce the preparation cost of silicon-based solid amine adsorbent has become a research focus. The research progress of silicon-based solid amine adsorbents derived from fly ash in recent years was reviewed. And the substrate preparation technologies, organic amine loading technologies, CO2 adsorption performances and cycle stabilities of silicon-based solid amine adsorbents derived from fly ash were emphatically described. Finally, the future research directions of silicon-based solid amine adsorbents derived from fly ash were prospected.关键词：CO2 capture;solid amine adsorbents;fly ash;CO2 adsorption performances;cycle stabilities58|0|0更新时间：2025-03-27 -
摘要：Carbon dioxide capture, utilization and storage (CCUS) technology is widely recognized as a technology that can effectively reduce carbon dioxide emissions. CCUS demonstration engineerings are the key to developing China’s decarbonization industry, which are of great significance to China’s realization of carbon peaking and carbon neutrality. The key technical links of CCUS demonstration engineerings were described, and the scale and distribution of demonstration project of each key technical link were summarized. The problems existing in CCUS demonstration projects at home and abroad were analyzed, and suggestions were put forward to promote the further development of CCUS technology.关键词：CCUS technology;CCUS demonstration engineerings;carbon peaking;carbon neutrality213|0|0更新时间：2025-03-27 -
摘要：Phase change absorbents for CO2 capture have garnered significant attention as a novel low energy carbon capture technology. Physical solvent-based phase change absorbents exhibit the advantage of lower CO2 loading of rich-phase solution after phase splitting, indicating strong application potential. Accurate prediction of the phase equilibrium properties of solvent components is crucial for the design and optimization of CO2 capture systems by phase change absorption. Three typical statistical associating fluid theory (SAFT) equations of state (CPA, PC-SAFT and SAFT-VR-SW EoSs, respectively) were used to systematically evaluate the predictive performance of different association schemes on the vapor-liquid phase equilibrium properties for pure component (CO2, C1, C2, C3 or C4 alkanol) and binary mixtures (CO2 + C1 alkanol, CO2 + C2 alkanol, CO2 + C3 alkanol or CO2 + C4 alkanol). By introducing binary interaction parameters (kij), the predictive performances of different EoSs for the vapor-liquid phase equilibrium properties of binary mixtures were investigated. The results indicate that for CO2, the non-association scheme demonstrates higher predictive accuracy, with the PC-SAFT EoS providing the best performance. For C1 alcohol to C4 alcohol, the SAFT-VR-SW EoS shows the largest predictive deviation, while the CPA and PC-SAFT EoSs exhibit no significant differences, regardless of using the 2B or 3B association schemes. When kij is 0, there is a significant difference in the phase equilibrium properties prediction of the three EoSs for different binary mixtures, with the PC-SAFT EoS yields superior predictive capabilities. By introducing the optimal kij, the prediction accuracies of the phase equilibrium properties of the three EoSs for the binary mixtures are significantly improved, with the most notable improvement in the SAFT-VR-SW EoS, where the predicted deviation decreases from 35.37% to 5.42%.关键词：CO2 capture;Alkanols;SAFT-type EoS;phase equilibrium properties;binary mixture systems123|0|0更新时间：2025-03-27 -
摘要：Pipeline blockage caused by hydrate formation and aggregation is one of the major challenges in deep-sea oil and gas flow assurance. Hydrate anti-agglomerants (AAs) can prevent hydrate particle aggregation, thereby mitigating hydrate blockage. Anti-agglomerants have advantages such as low dosage requirements and suitability for high subcooling environments (> 10 ℃), making them promising for future applications. First, the different types of hydrate anti-agglomerants were reviewed, and the mechanisms of action of the anti-agglomerants at the molecular level on hydrate surfaces were analyzed, and how the conformation of the anti-agglomerant influences its performance was discussed. Then, common evaluation equipment and methods for anti-agglomerants were summarized, and how factors such as the composition of liquid hydrocarbons, water cut, waxes, asphaltenes and salts affect the anti-agglomeration effect was explored. Finally, the future development of hydrate anti-agglomerants was prospected. The mechanism of action of anti-agglomerants in the systems is complex, and the anti-agglomerants with better adaptability and inhibition effect can be selected according to different systems. This study can provide a reference for the development of efficient, green and cost-effective hydrate anti-agglomerants.关键词：flow assurance;hydrates;anti-agglomerants;molecular dynamics simulation43|0|0更新时间：2025-03-27 -
摘要：The storage and transportation of natural gas using gas hydrates have garnered attention from researchers. However, the application of this technology is limited by challenges such as harsh formation conditions, slow formation rates, and low gas storage capacity. A co-promoter composed of potassium perfluorohexanesulfonate (PHS) and graphene oxide (GO) was employed to investigate the kinetics of methane hydrate formation under conditions of 277 K and 6 MPa. The results indicate that using different concentrations of the co-promoter significantly reduces the induction time, with the shortest induction time of 3 min (0.2 g/L GO + 10 mmol/L PHS) compared to 221 min for the pure water system. The maximum gas storage capacity achieved was 158 mL/mL (0.2 g/L GO + 10 mmol/L PHS), which represents a 690% increase over the pure water system and a 28% increase compared to using 0.2 g/L sodium dodecyl sulfate (SDS) as a promoter. Furthermore, the co-promoter (0.2 g/L GO + 10 mmol/L PHS) demonstrated good recyclability, maintaining a gas storage capacity of 120 mL/mL during five cycles.关键词：methane hydrate;fluorinated surfactant;graphene oxide;kinetics55|0|0更新时间：2025-03-27
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