Key Laboratory of Industrial Ecology and Environmental Engineering School of Environmental Science and Technology Dalian University of Technology Dalian 116024 Liaoning China;
State Key Lab of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 Liaoning China;
CO_2 hydrogenation; Methanol selectivity; In-situ DRIFTS; CeO_2; ZrO_2;