Abstract
This work synthesized a series of Ni/CeO2/Al2O3 catalysts with varying CeO2 doping amounts to enhance low-temperature CO2 methanation.The introduction of CeO2 weakens the interaction between Ni and Al2O3,leading to the formation of Ni-CeO2 active sites.This results in a high dispersion of Ni and CeO2,improved catalyst reducibility,increased number of active sites,and enhanced the CO2 methanation.This work further investigated the impact of WHSV and catalyst stacking configuration to enhance the re-action.When the catalyst is stacked into three segments with a temperature gradient of 330 ℃,300 ℃,and 250 ℃ under WHSV=9000 ml·h-1·g-1,the CO2 conversion significantly increases to 95％,which is remarkably close to the thermodynamic equilibrium(96％).
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