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The effect of reaction temperature (a,b) on the CO2 conversion and CH4 selectivity. The conditions of reaction temperature test are H2:CO2:N2 = 4:1:0.5, GHSV = 2000 h−1 and 1 atm. (c) Proposed reaction mechanism of CO2 adsorption and methanation over reduced Ni-Re/CCFA. Reproduced with permission from [130]. Copyright: Elsevier, Amsterdam, The Netherlands, 2020.
