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• W4387517456 abstract "Faced with increasingly severe energy and environmental issues, the clean and efficient utilization of coal slime is an urgent problem to be solved. Due to the concerns about carbon reduction and the intention to produce high quality gaseous products, pyrolysis experiments of coal slime coupled with in-situ and ex-situ CO2 capture were carried out in a fixed-bed reactor. The effect of pyrolysis temperatures, mixing ratios of coal slime and CaO, and the CO2 capture ways were investigated. The gaseous products from coal slime pyrolysis mainly included H2, CO, CO2, CH4, etc. It was revealed that after adding CaO, the hydrogen content in the pyrolysis gas increased significantly, while the CO2 content decreased. When the temperature increased from 600 to 800 oC, the generation of gas products was enhanced. Due to the different interactions between the coal slime and CaO, the CO2 capture efficiency of in-situ capture was higher than that of ex-situ capture, but ex-situ capture presented a relatively higher hydrogen production. When the coal slime/CaO mixing ratio is 1:1 and the pyrolysis temperature is 600 oC, the in-situ CO2 capture ratio could reach 92.1%, and H2 content at this situation is the 56.5%. For ex-situ CO2 capture, the capture efficiency of CO2 increased with the increasing proportion of CaO. When the coal slime/CaO mixing ratio was 1:1, the ex-situ capture efficiency of CaO for CO2 is 74% at 600 oC while the H2 content is 59.3%. After CO2 was captured by CaO, the diffraction peaks of CaCO3 appeared in XRD patterns, and the microscopic morphology of CaCO3 particles was clustered. Peaks corresponding to CaCO3 also appeared in the C 1 s, Ca 2p, and O 1 s regions of the XPS peak spectrum, and showed a trend of first increasing and then decreasing as the temperature gradually increased. This study will provide a theoretical guidance on the efficient and clean utilization of coal slime." @default.
• W4387517456 created "2023-10-12" @default.
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• W4387517456 date "2023-10-01" @default.
• W4387517456 modified "2023-10-15" @default.
• W4387517456 title "Characteristics of coal slime pyrolysis with integrated CO2 capture" @default.
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• W4387517456 doi "https://doi.org/10.1016/j.jaap.2023.106218" @default.
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