最新刊期
卷 49 ， 期 12 ， 2024
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摘要：Due to the complex reaction mechanisms of Fischer-Tropsch synthesis reaction and the limitation of characterization methods, it is difficult to connect the macroscopic experimental results with the microscale changes, so theoretical calculations are needed to provide theoretical support for experimental research. In view of the extensive application of iron-based catalysts in Fischer-Tropsch synthesis reaction and the important role of alkali metal promoters (“alkali promoters” for short) in iron-based catalysts for Fischer-Tropsch synthesis reaction, the research progress on alkali promoters modified iron-based catalysts for Fischer-Tropsch synthesis reaction was reviewed. At first, the active phases of iron-based catalysts for Fischer-Tropsch synthesis reaction and the migration of alkali promoters in the surface phase and bulk phase of the catalysts during carbonization were summarized. Then the effects of alkali promoters on the structures of iron-based catalysts for Fischer-Tropsch synthesis reaction was analyzed, and the theoretical calculation results of promoting effects of alkali promoters on iron-based catalysts for Fischer-Tropsch synthesis reaction (catalyst structure design, reaction path distribution, reactant molecular adsorption and product distribution, etc.) were introduced. Finally, the future development of related fields was prospected.关键词：Fischer-Tropsch synthesis;iron-based catalysts;alkali promoters;theoretical calculation257|0|0发布时间：2024-12-25 -
摘要：CH4-CO2 reforming reaction is a technology for achieving CO2 resource utilization. During CH4-CO2 reforming reaction process, the sintering and carbon deposition of catalysts are the main factors restricting their industrialization. A series of Ni-W bimetallic catalysts were synthesized using the solid-state grinding method. The texture properties, phase compositions, number of active sites, and carbon deposition of the catalysts were analyzed by BET, XRD, H2-TPR, H2-TPD, XPS, TG-DTA and Raman. The effects of different W loading amounts (mass fraction) on catalytic performances and anti-carbon deposition performances of catalysts were evaluated. Compared with monometallic Ni-based catalysts, the introduction of W significantly reduces the particle size of the active component. However, with the increase of W loading, the particle size of the active component increases and the number of active sites significantly decreases in Ni-W bimetallic catalysts. Among them, the initial activity of the Ni2W/SBA-15 is the highest. At 700 ℃ and 30000 mL/(g·h), the conversion rates of CH4 and CO2 are 58% and 66%, respectively. The TG-DTA results show that the Ni6W/SBA-15 produces the least amount of carbon deposition, which is 3.67% after 1450 min.关键词：CH4-CO2 reforming;bimetallic catalysts;anti-carbon deposition performance;W loading amounts59|0|0发布时间：2024-12-25 -
摘要：The selection of suitable support is crucial for the rational design of novel and efficient Fe-based catalysts for CO2 hydrogenation to light olefins (ethylene, propylene and butene). Supports were synthesized by hydrothermal method, and impregnated with K and Fe to prepare a series of Fe-based catalysts (K-Fe/ZrO2, K-Fe/ZnO, K-Fe/TiO2 and K-Fe/Al2O3). The effects of these supports on the catalytic performance of CO2 hydrogenation were investigated. The catalysts were characterized by XRD, N2 absorption/desorption, Raman, CO-TPD,CO2-TPD , in suit Raman and water droplet contact angle tests, and the induction effects of supports on the generation of Fe active species were studied. The results show that under reaction conditions of temperature of 320 ℃, pressure of 2.0 MPa, feed gas V(CO2):V(H2):V(Ar) = 1:3:3 and gas hourly space velocity of 10000 mL/(g·h), K-Fe/ZrO2 exhibites superior selectivity of light olefins (42.4%) and CO2 conversion rate (36.2%). Compared to other catalysts, K-Fe/ZrO2 has a suitable adsorption capacity for CO and CO2, which is beneficial for CO2 activation and carbon deposition. It also inhibits the secondary hydrogenation of olefins while obtaining more FexCy active species. Additionally, K-Fe/ZrO2 exhibites strong hydrophobicity due to carbon deposition during the reaction process, further reducing the degree of water oxidation of FexCy and improving the selectivity of light olefins.关键词：CO2 hydrogenation;light olefins;support;dynamic evolution;Fe-based catalysts40|0|0发布时间：2024-12-25 -
摘要：As an emerging two-dimensional inorganic material, boron nitride (BN) has been widely used in the oxidative dehydrogenation of alkanes in recent years, and it is now shown that the introduction of oxygen species makes the BN have a better catalytic performance. The oxygenated BN catalysts (n(boric acid):n(urea) = 1:1, 1:2, 1:3 and 1:4) were prepared by direct co-fusion synthesis using boric acid as the boron source and urea as the nitrogen source. Under the conditions of temperature from 400 to 700 ℃, space velocity 14400 mL/(g·h) and V(CH4):V(O2) = 2:1, the catalytic performances of the catalysts for partial oxidation of methane (POM) reaction were investigated. The oxygen-containing functional groups, elemental contents (mass fraction), crystalline structures and oxygen reduction abilities of the catalysts were characterized by FT-IR, ICP-OES, XRD and cyclic voltammetry (CV). The results show that in POM reaction, the catalyst (BN-1:2) under the condition of n(boric acid):n(urea) = 1:2 exhibites the best catalytic performance (CH4 conversion rate of 43%, CO selectivity of 72% and H2 selectivity of 17%). Compared with the other three catalysts, BN-1:2 has the highest crystallinity, which makes the interaction between BN-1:2 and O2 stronger and promotes O2 activation. BN-1:2 has the highest current density in CV tests, indicating that it has the strongest oxygen reduction capability (3.4889 × 10-4 A/cm2), which promotes active site formation and thus exhibits better catalytic performance.关键词：boron nitride;partial oxidation of methane;oxygen reduction capability;catalysts43|0|0发布时间：2024-12-25 -
摘要：Alkoxycarbonylation reaction is an important method for the one-step synthesis of high-value ester products, which has important applications in the field of fine chemicals. However, the reaction rate of medium- and long-chain olefins is low, and the industrial production applications often face difficulties such as high cost, poor product selectivity and easy decomposition of catalysts. Novel catalytic systems were used to convert endo- or terminal-octenes to methyl n-nonanoates by alkoxycarbonylation. The influence of phosphine ligands, catalysts, temperatures, pressures, alcohols and different olefins on the alkoxycarbonylation of octenes were investigated, respectively. Combined with the analysis results, the reaction mechanism of octene alkoxycarbonylation was explained. The results show that the introduction of asymmetric bisphosphine ligands (L8) containing ferrocene skeleton into the reaction system has good catalytic activity and product selectivity. And under the optimal reaction conditions (130 °C, 4 MPa, 0.1 mol 1-octene, 5.0 mmol p-toluenesulfonic acid, 0.1 mmol Pd(acac)2, 0.3 mmol phosphine ligand L8 and reaction for 15 h), the reaction shows the best activity. At the moment, conversion rate of 1-octene, yield of methyl nonanoates and molar ratio of stereomers and isomers methyl nonanoates are 99%, 99% and 17.2, respectively. Compared with other ligands, the ferrocene moiety in the phosphine ligand L8 has unique electronic properties, which can influence the electronic effect of the phosphine ligand by adjusting the electron cloud density, thus optimizing the electronic state of the metal center and improving the activity and product selectivity of the catalysts. In addition, the rigidity of the ferrocene backbone helps the ligands to maintain a specific spatial site resistance during the coordination process, contributing to the improved product selectivity of alkoxycarbonylation of medium- and long-chain olefins.关键词：alkoxycarbonylation;octenes;palladium catalysts;phosphine ligands;methyl n-nonanoates30|0|0发布时间：2024-12-25 -
摘要：Selective catalytic hydrogenation of substituted nitroaromatic hydrocarbons is an effective method to prepare substituted aromatic amines. It is an urgent problem to precisely regulate the reaction site of precious metal catalyst and enhance its catalytic stability in this reaction. The SiO2 core-shell precursor containing PdCu alloy (PdCu@SiO2) was prepared by sol-gel method. Then the mesoporous core-shell SiO2 catalyst containing PdO-CuO (PdO-CuO@mSiO2), the mesoporous core-shell SiO2 catalyst containing Pd-CuO (Pd-CuO@mSiO2) and the mesoporous core-shell SiO2 catalyst containing PdCu alloy (PdCu@mSiO2) were prepared. The catalysts were characterized by TEM, XRD and TG, etc., and their catalytic performances for selective catalytic hydrogenation of 4-nitrochlorobenzene to 4-aminochlorobenzene were studied. The results show that reaction under the optimal conditions (0.5 mmol 4-nitrochlorobenzene, 12.0 mL ethanol, 80 ℃ and 1.0 MPa) for 4.0 h, Pd-CuO@mSiO2 has better catalytic performance than Pd@mSiO2 and PdCu@mSiO2, with 4-nitrochlorobenzene conversion rate of 96.5% and 4-amino-chlorobenzene selectivity of 99.6%. The good catalytic performance of Pd-CuO@mSiO2 is related to the strong interaction between Pd and CuO in the structure. Pd-CuO@mSiO2 also shows good catalytic performance for the catalytic hydrogenation of m-chloronitrobenzene, p-nitroacetophenone and 4-nitrobenzoate. In addition, cycling under the optimal reaction conditions for five times, the 4-nitrochlorobenzene conversion rate and 4-amino-chlorobenzene selectivity of Pd-CuO@mSiO2 maintain at 96.4% and 95.7%, respectively.关键词：substituted nitroaromatics;Pd-based core-shell catalysts;selective hydrogenation;substituted aromatic amines39|0|0发布时间：2024-12-25 -
摘要：Transformation of biowaste into N-doped biochar conforms to a concept of green chemistry and also shows good prospects in energy storage and environmental governance. Among them, the precursor type is the key point for the production of high-performance nitrogen-doped biochar. Chitosan, as the only sole polysaccharide with amine-based groups in nature, is an excellent precursor for nitrogen-doped biochar. In situ N-doped can be achieved in biochar through a thermo-chemical process under inert atmosphere. Recent developments on preparation methods of chitosan-based nitrogen-doped biochar and its applications, including supercapacitor, electro-catalysis, CO2 capture and water treatment, were discussed. The effects of surface areas, pore structures and nitrogen-containing functional groups of biochar on the application performances were analyzed. The characteristics, advantages and key issues faced in practical applications of nitrogen-doped biochar were discussed. It can provide certain references for designing high-performance nitrogen-doped biochar and broadening its potential applications.关键词：chitosan;nitrogen-doped biochar;energy storage;carbon capture;water treatment81|0|0发布时间：2024-12-25 -
摘要：The plasticizer dioctyl phthalate (DOP) has issues of reproductive toxicity and poor migration resistance. Methyl oleate was selected as the primary raw material to synthesize hyperbranched polyethylene (HBPE) through processes including double bond epoxidation, epoxy group hydrolysis and bulk transesterification. This was followed by butyrylation to synthesize IA-HBPE polyester, which can serve as a green, low-toxicity bio-based plasticizer. The chemical structures of different plasticizer samples were characterized using FTIR and 1H-NMR. Subsequently, polyvinyl chloride (PVC) composites were prepared using the solution casting method, and the glass transition temperature, mechanical properties, thermal stability and migration resistance of different PVC composites were tested. The results show that IA-HBPE polyester has good compatibility with PVC, and the glass transition temperature of PVC material plasticized with IA-HBPE polyester decreases from 75.0 ℃ to -5.0 ℃. The elongation at break of PVC material plasticized with IA-HBPE polyester reach 402.0%, compared to 289.5% for PVC material plasticized with DOP. Compared to DOP, the extraction rate and volatilization rate of IA-HBPE polyester in PVC materials are reduced by 22.99% and 7.08%, respectively, indicating superior migration resistance of IA-HBPE polyester. PVC materials plasticized with IA-HBPE can maintain good thermal stability below 220 ℃, meeting the requirements for practical thermal processing. The hyperbranched polyester based on oleic acid is an efficient, environmentally friendly new plasticizer, showing promise as a replacement for DOP.关键词：PVC;plasticizer;oleic acid;hyperbranched polyester29|0|0发布时间：2024-12-25 -
摘要：Metal-organic frameworks (MOFs) materials have great properties such as high specific surface area, adjustable porosity and high stability, so the MOFs membranes have excellent gas adsorption and desorption properties. However, current research on MOFs membrane processes faces challenges such as unclear design routes and difficulties in commercialization. Therefore, reviewing the research progress and potential applications of MOFs membranes in hydrogen, helium and methane separation and purification technologies are of significant importance. Firstly, the structural properties of MOFs materials and the application of molecular simulation in the selection and performance prediction of MOFs materials were introduced. Separation performances of MOFs membranes prepared experimentally for hydrogen, helium and methane were summarized, including the internal structure of the materials, separation mechanisms, stability, and applicable conditions. Secondly, considering that the industrial application of MOFs membranes is still in its early stages, the possible applications of these membranes in processes involving membrane separation units as well as related challenges and limiting factors, were discussed. Furthermore, an economic analysis was conducted based on case studies, exploring the replacement of traditional separation materials with MOFs membranes and the upgrading of entire processes to membrane separation technologies, revealing considerable economic benefits of adopting membrane separation technologies. Finally, in light of the excellent properties of MOFs materials, future research directions in this field were anticipated, aiming to provide a reference for the application of MOFs membranes in hydrogen, helium and methane separation and purification processes.关键词：MOFs membranes;hydrogen helium methane separation;membrane separation method;hydrogen purification;helium extraction65|0|0发布时间：2024-12-25 -
摘要：The synergistic catalytic oxidation of NO by nano catalysts and low-temperature plasma (NTP) has received widespread attention in the removal of nitrogen oxides from flue gas. Nano Co-Ce catalysts (Co-CeOx) were synthesized by the hydrothermal method, and their synergistic catalytic efficiency with dielectric barrier discharge (DBD) for NO oxidation was investigated. The sulfur and water resistance properties of the catalysts were also investigated. The results indicate that the synergistic effect of nano Co-CeOx catalysts and DBD can achieve efficient oxidation of NO, with NO2 as the main catalytic product. When the voltage is 19 kV to 23 kV, the conversion rate of NO can reach 100%. When the voltage is above 23 kV, the NO conversion rate decreases as the voltage increases. In addition, with the introduction of SO2 (400 × 10-6, volume fraction), the catalysts exhibit excellent sulfur resistance property. When H2O (5%, volume fraction) is introduced, the water resistance property of the catalysts is relatively weak. The characterization results of the catalyst indicate that there is no significant change in the crystal structure of the catalysts before and after the reaction, indicating that the catalysts have good stability. The synergistic effect between Co and Ce in the catalysts results in a higher surface active oxygen and oxygen migration rate. Finally, based on experimental phenomena and spectral characterization, the reaction pathway of synergistic efficient catalytic oxidation of NO by Co-CeOx catalysts and low-temperature plasma was inferred.关键词：catalyst;NO oxidation;dielectric barrier discharge;synergistic catalysis26|0|0发布时间：2024-12-25 -
摘要：Polyacrylonitrile (PAN) nanofibers exhibit low adsorption capacities for metal ions, resulting in poor desulfurization performance of the prepared desulfurization sorbents. Polyvinylpyrrolidone (PVP) and hydroxylamine hydrochloride (HAC) were selected to modify PAN nanofibers. Through electrospinning and surface modification, modified support precursors were obtained, and subsequently, Fe-Mn bimetallic desulfurization sorbents were prepared via impregnation and heat treatment. The effects of PVP addition, HAC modification temperature and metal salt concentration on the structure and performance of the desulfurization sorbents were investigated. SEM analysis indicates that both PVP and HAC modifications can obtain desulfurization sorbents with good fibrous morphologies and the active components have good dispersion on the fiber surface. TEM and XPS analysis confirms the successful loading of Fe2O3 and MnO2 on the fiber surface. XRD analysis reveals the formation of Fe7S8 after desulfurization. Textural property analysis demonstrates a significant increase in the specific surface area of the modified desulfurization sorbents. The unmodified desulfurization sorbent exhibits a specific surface area of 5.91 m²/g, while the modified desulfurization sorbent reaches a maximum of 8.10 m²/g (PVP modification) and 14.23 m²/g (HAC modification). ICP-OES analysis shows that the modification significantly enhances the loading (mass fraction) of active components, increasing from 0.93% to a maximum of 22.65% (PVP modification) and 30.97% (HAC modification). Desulfurization performance tests indicate that the breakthrough sulfur capacity (measured as the mass of hydrogen sulfide removed per 100 g of desulfurization sorbent) increases from 0.75 g to a maximum of 4.72 g (PVP modification) and 6.70 g (HAC modification), respectively.关键词：coal gas desulfurization;electrospinning;carbon nanofibers;Fe-Mn desulfurization sorbent;modification21|0|0发布时间：2024-12-25 -
摘要：The high-gravity reactor has excellent mass transfer performance and has broad application prospects in the field of natural gas decarbonization. In order to effectively predict the natural gas decarburization performance of the high-gravity reactor, a set of natural gas decarburization experimental system based on high-gravity reactor was built, and the influences of operating parameters (high gravity factor, spray density of absorbent, mixture volume flow rate and intake composition, etc) on the CO2 removal performance were investigated. Then a dimensionless method was adopted to establish the mapping relationship between operating parameters and mass transfer coefficient. Finally, based on the least square support vector machine (LSSVM) algorithm, the intelligent prediction model was established. The results show that both the high gravity factor and absorbent spray density have optimal values, which are 57.62 and 2.04 m3/(m2·h), respectively. In addition, it is found that the CO2 removal effect decreases while the mass transfer coefficient increases with the increases of mixture volume flow rate. Under the condition of optimal model parameter ([γ,t,d] = [13557.2021,9.5876,4]), the determination coefficient (R2) and average relative error (MRE) of prediction results of intelligent prediction model are 0.9519 and 0.0949, respectively, and the relative error of prediction results is within ±20%. It demonstrates that the intelligent prediction model has high accuracy.关键词：high gravity reactor;natural gas decarburization;LSSVM algorithm;mass transfer;intelligent prediction model87|0|0发布时间：2024-12-25 -
摘要：The traditional homogeneous Fenton process has some problems, such as requiring the addition of H2O2 to consume a large amount of iron ions, the narrow pH application range and the generation of a large amount of iron sludge. Through designing a series of xCu(Fe)/Pd-In/TiO2 bifunctional catalysts, a coupling H2O2 direct synthesis-Fenton (Fenton like) reaction system was constructed to achieve efficient synthesis of H2O2, and in-situ activation degradation of tetracycline in wastewater. XRD, TEM and EPR characterization techniques were used to analyze the crystal structure and microscopic topography of the catalysts, and the effects of pH value, initial mass concentration of tetracycline solution, mass concentration of catalysts and coexisting ions on the tetracycline removal performances of the catalysts were investigated. The results show that the tetracycline removal rate of 2Fe/Pd-In/TiO2 catalyst is the highest (88.1%) after 90 min of reaction under the optimal reaction conditions of temperature of 25 ℃, pH value of 7, initial mass concentration of tetracycline solution of 30 mg/L, catalyst mass concentration of 0.2 g/L and no coexisting ions. Under the above conditions, the tetracycline removal rate of the 1Cu/Pd-In/TiO2 catalyst is the highest (80.3%) at pH value of 3. The tetracycline removal ability of xFe/Pd-In/TiO2 catalyst is better than that of xCu/Pd-In/TiO2 catalyst. This is mainly due to the more uniform dispersion of Fe on the catalyst surfaces and the relatively small particle size of the catalysts. The results of free radical capture experiment and EPR analysis show that ·O -
摘要：Hydrogen, as an ideal efficient and clean energy, is the primary choice for the transformation of China’s energy system to low-carbon. Hydrogen storage and transportation technology is the key to promote the development of hydrogen energy industry, in which the organic liquid hydrogen storage technology has become a research hotspot due to its advantages of high safety and high hydrogen storage density, especially the methylcyclohexane(MCH)-toluene hydrogen storage system, which has demonstrated a good potential for industrial application. The biggest resistance to the development of catalysts for MCH-toluene hydrogen storage system is the lack of stable and efficient catalysts for MCH catalytic dehydrogenation process, and the design of great stability and high selectivity catalysts with low-temperature and high-activity is the key to facilitate the development of the MCH-toluene hydrogen storage system. The advantages of organic liquid hydrogen storage technology, the characteristics of hydrogen storage media and the current research status of MCH dehydrogenation catalysts were reviewed. The MCH dehydrogenation catalysts were classified into noble metal and non-precious metal catalysts according to the rarity of the active metal, and the dehydrogenation performances of MCH dehydrogenation catalysts were summarized and analyzed in terms of the active components, the selection of carriers, and the preparation methods. Future research on MCH dehydrogenation catalysts can start from the following aspects. (1) Extend the lifetime of precious metal catalysts and improve the recovery of precious metal active components. (2) Modify carriers or introduce new active components for non-precious metal dehydrogenation catalysts. (3) Integrate the energy utilization of the whole MCH catalytic dehydrogenation process, and reduce the energy consumption of the dehydrogenation process through the introduction of clean energy-assisted heating.关键词：hydrogen energy;methylcyclohexane;dehydrogenation;MCH dehydrogenation catalysts54|0|0发布时间：2024-12-25 -
摘要：The development of hydrogen production technology by electrolytic water is important to promote the low-carbon development, among which the design of efficient and stable catalysts is essential. Ru-FeOOH@NiFe LDH catalyst was synthesized on nickel foam substrate by one-step hydrothermal method and characterized by SEM, TEM, XRD and XPS. The results show that the introduction of Ru can adjust the electronic structure of the catalyst, improve the interaction between metal and supports, and the catalyst shows better electrocatalytic performance. The required overpotential of Ru-FeOOH@NiFe LDH is 95 mV at the current density of 10 mA/cm2 with a low Tafel slope of 80.6 mV/dec, which indicates that the electrocatalytic performance of Ru-FeOOH@NiFe LDH is better than that of FeOOH@NiFe LDH. Ru-FeOOH@NiFe LDH can catalyze the reaction stably for 15 h under the same reaction conditions.关键词：water electrolysis;hydrogen evolution reaction;electrocatalyst;NiFe layered double hydroxide85|0|0发布时间：2024-12-25 -
摘要：Injecting carbon dioxide (CO2) into seabed sediment layers to form CO2 hydrates is an effective method of carbon sequestration. However, this approach faces challenges such as long induction times and slow growth rates of hydrate formation. Using quartz sand as the porous medium, the effects of quartz sand grain size, initial water saturation and additives on the kinetics of CO2 hydrate growth and the evolution of its macroscopic morphology were studied under isothermal and isochoric conditions at the experimental temperature of 273.65 K and the initial pressure of 3.5 MPa. The study results indicate that in a 3.4% NaCl solution (percentage is by mass, same below), with an initial water saturation of 75%, when the quartz sand grain size is 26 mesh to 40 mesh, the CO2 hydrate growth rate is the fastest, and the formation amount is the highest. And the final gas consumption is 0.0285 mol, with a water conversion rate of 7.27%. With a quartz sand grain size of 10 mesh to 18 mesh, when the initial water saturation is 50%, the CO2 hydrate formation amount is the highest, with a final gas consumption of 0.0384 mol and water conversion and conversion amount of 17.17% and 4.29 g, respectively. In a 1% L-methionine solution, the CO2 hydrate growth rate accelerates, and the formation amount increases significantly, with a final gas consumption 3.6 times higher than in pure water and the conversion rate of water increases by 5.7 times. Compared to pure water, the CO2 hydrate formation amount in the 3.4% NaCl solution does not show significant changes. In the mixed solution (3.4% NaCl + 1% L-methionine), the promoting effect of L-methionine is weakened, resulting in a slower CO2 hydrate growth rate and a reduced formation amount, though still better than in the 3.4% NaCl solution. Morphological experiments indicate that the CO2 hydrate film coverage time is the shortest in pure water (5.33 s) and the longest in the mixed solution (14.33 s). Adding L-methionine can alter the macroscopic morphology of the hydrates, making them loose and porous.关键词：marine carbon sequestration;CO2 hydrates;growth rate;L-methionine;macroscopic morphologies23|0|0发布时间：2024-12-25 -
摘要：Injection of liquid CO2 for exploiting natural gas hydrates can safely produce CH4 while sequestering carbon in situ. To reveal the influence of CO2 phase states on hydrate reservoirs during extraction, a triaxial hydrate penetration experimental apparatus was used. In a NaCl system, quartz sand served as the porous medium, CH4 gas was injected to form methane hydrate, simulating natural gas hydrate reservoirs. Under a pore pressure stress of 4.5 MPa, the effects of liquid CO2 injection on the decomposition behavior of methane hydrate, the impact of reaction temperature on methane hydrate extraction by liquid CO2 injection, and the influence of reaction temperature on the post-extraction hydrate saturation of the reservoir were studied, respectively. The results show that injection of liquid CO2 promotes the decomposition of methane hydrate. At the reaction temperature of 8.0 ℃ and the reaction pressure of 4.5 MPa, compared with the depressurization method, injection of liquid CO2 increases CH4 production by 22.81% and the recovery rate by 13.66%. In a liquid CO2 environment, higher reaction temperatures are favorable for the decomposition of methane hydrate. Compared to 6.0 ℃, the CH4 production increases by 40.41% at 10.0 ℃. Higher reaction temperatures play a dominant role in promoting hydrate decomposition, compared to the heat released during CO2 hydrate formation. As the reaction temperature increases, CO2 sequestration amount, conversion rate, and post-extraction reservoir hydrate saturation all decrease. At reaction temperatures of 6.0 ℃ and 10.0 ℃, CO2 sequestration amounts are 0.1962 mol and 0.1034 mol, CO2 conversion rates are 22.08% and 11.86%, and post-extraction reservoir hydrate saturations are 57.91% and 34.21%, respectively, which increases by 38.81% and decreases by 18.01%, compared to the average initial saturation (41.72%). Injection of liquid CO2 for exploiting natural gas hydrates has a positive effect on increasing CH4 production and recovery rates, as well as promoting CO2 sequestration.关键词：liquid CO2;hydrate extraction;natural gas hydrates;CO2 sequestration18|0|0发布时间：2024-12-25
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