Article
Energy & Fuels
Sivachidambaram Sadasivam, Shakil Masum, Min Chen, Kamil Stanczyk, Hywel Thomas
Summary: This study explores the CO2 adsorption-desorption kinetics of bituminous coal under low pressure injection and compares different models to fit the data. The results suggest that bulk pore diffusion, surface interaction, and multilayer adsorption are the rate-determining steps.
Article
Engineering, Chemical
Zichao Hu, Chao Li, Dengfeng Zhang
Summary: The interaction between CO2 and water significantly changes the pore structure and surface functional groups of coals of different ranks, requiring further attention in the field of CO2-ECBM.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Geochemistry & Geophysics
Jia Kong, Baiquan Lin, Chuanjie Zhu, Ting Liu, Xiangguo Kong
Summary: In this study, a dynamic elastic modulus model was established to analyze the effect of gas pressure on the elastic modulus of coal. A permeability model considering internal swelling deformation was also constructed. The rationality of the models was validated through laboratory experiments.
Article
Engineering, Chemical
Phanikumar Pentyala, Pinak Bhusan Mohapatra, Parag A. Deshpande
Summary: The study utilizes van der Waals-corrected density functional theory calculations to investigate the energetics of interactions between shale minerals and methane, carbon dioxide, providing detailed mechanisms behind the displacement of methane by carbon dioxide, conclusively proving the stronger adsorption of CO2 and the kinetic feasibility of its displacement, offering insights into the successful CO2 sequestration during enhanced gas recovery processes.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Energy & Fuels
Prashant Jadhawar, Jinhai Yang, Antonin Chapoy, Bahman Tohidi
Summary: This study investigates CO2 sequestration and storage into methane (CH4) hydrate sediments, examining the replacement of CH4 by CO2 in hydrates under varying thermodynamic conditions at both the macroscale and microscale levels. The results show high CH4 gas recovery within HSZ-II, while higher water saturation conditions diminish this recovery. In addition, significant CH4 production is obtained deep inside HSZ-I with the application of inhibitors. Our novel microscale micromodel evaluations reveal the release of CH4 gas through convection, slow CO2 diffusive mass transfer, and CO2-CH4 replacement within HSZ-I.
Article
Chemistry, Multidisciplinary
Zhihao Fu, Baoshan Jia, Yanming Wang, Weipeng Tian
Summary: This study investigates the effect of CO2 injection pressure on gas migration characteristics and coalbed methane (CBM) extraction. Experimental tests were conducted using a CH4 to CO2 replacement platform under different CO2 injection pressures. The results indicate that gas migration rate increases with higher injection pressure, and CH4 desorption rate and coal seam permeability display different stages of decline and stability. Higher injection pressure leads to increased CH4 desorption volume and CO(2) sequestration volume, and improved CH4 extraction efficiency. These findings are of great importance for optimizing CO2 injection pressure and enhancing CBM extraction.
Article
Chemistry, Multidisciplinary
Bo Li, Junxiang Zhang, Zhiben Ding, Bo Wang, Peng Li
Summary: This study suggests that ECBM recovery by N-2 injection is a feasible technical method for low-permeability coal reservoirs. The research found that coal permeability increases gradually and finally stabilizes during the N-2 injection process. The proposed dynamic evolution model of coal permeability can be applied to predict CBM production and guide engineering applications.
Article
Chemistry, Multidisciplinary
Jianchi Hao, Hu Wen, Li Ma, Jinbiao Fei, Lifeng Ren
Summary: This study analyzes the adsorption characteristic curves of three coal samples for CO2, finding that the curves are independent of temperature and have a negative correlation between adsorption potential and adsorbed phase volume. A prediction model for CO2 adsorption by coal is derived based on the adsorption potential theory, showing accurate and reliable results. The model can predict adsorption capacity under different temperature and pressure conditions with a strong correlation to experimental data, making it a valuable tool for practical applications.
Article
Chemistry, Multidisciplinary
Hu Wen, Jianchi Hao, Li Ma, Xuezhao Zheng
Summary: The study revealed that the process of CO2 replacing CH4 can be divided into different stages, with desorption amount varying with time and temperature, and replacement ratio showing a positive correlation with replacement time. Overall, an increase in CO2 injection pressure would result in higher cumulative displacement ratio.
Article
Energy & Fuels
Biying Chen, Finlay M. Stuart, Sheng Xu, Domokos Gyore, Congqiang Liu
Summary: This study investigates the origin and characteristics of coalbed methane in the Liupanshui Coalfield in southern China, finding that the methane is mainly thermogenic in origin and the noble gases in the coalbed methane are related to coal maturity, with the loss of some light noble gases after basin exhumation.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2022)
Review
Chemistry, Physical
Chengxuan He, Shiqun Wu, Lingzhi Wang, Jinlong Zhang
Summary: This review discusses the importance and challenges of converting methane and carbon dioxide into hydrogen and carbon monoxide, highlighting the potential of photo-enhanced dry reforming of methane. Research results show promising and green routes under relatively mild conditions, providing insights and prospects for the future development of this field.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS
(2022)
Article
Engineering, Geological
John Richard Bowersox, Stephen F. Greb, Junfeng Zhu, David C. Harris
Summary: The passage describes research conducted in Kentucky, USA on storing CO2 in the Rose Run sandstone, with geomechanical properties tested to evaluate its suitability as a potential storage reservoir.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2021)
Article
Environmental Sciences
Zengmin Lun, Xia Zhou, Dongyang Li, Xing Tang, Xuexiang Fu, Yanji Zhang, Dengfeng Zhang
Summary: Introducing oxy-coal burning flue gas into coal reservoirs can reduce CO2, NOx, and SO2 emissions and produce in-situ coalbed methane (CBM). Long-duration NO exposure experiments were conducted on various ranks of coal matrices to assess the potential impacts on CO2 storage. The results show that NO exposure can reduce the number of pores in the coal matrix and change its adsorbability to CO2, indicating the potential for stable storage of NO and enhanced CO2 storage capacity. Overall, introducing oxy-coal burning flue gas into coal reservoirs has the potential to improve the existing technology and enhance CO2 sequestration. [GRAPHICS].
ENVIRONMENTAL TECHNOLOGY
(2023)
Article
Engineering, Chemical
Mengyu Xia, Wanyan Ding, Chenyang Shen, Zhitao Zhang, Chang -jun Liu
Summary: In this study, the decomposition of CO2 was achieved using a frosted dielectric barrier discharge (FDBD) with CeO2 enhancement, resulting in increased conversion and energy efficiency. The CeO2-enhanced FDBD showed improved microdischarge performance compared to traditional DBD with CeO2 fine particles, and it was also easier to load and remove.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
Rui-jie Sun, E-chuan Yan, Wan-li Liu, Jia-yu Ling, Li-na Xiao
Summary: The application of inhibitors in residual coal in mining areas enhances the CO2 adsorption capacity of the coal by changing its microstructural properties and increasing the space for CO2 sequestration. This study is significant in improving CO2 sequestration in residual coal in goaves.