摘要
CO_(2) hydrogenation to methanol is a critical technology for hydrogen energy conversion and a promising approach to mitigate the energy crisis and greenhouse effect.However,developing highly selective catalysts remains a major challenge for its practical application.Herein,we synthesize an efficient CoCuInO-r catalyst with Cu_(11)In_(9) and Co^(0) dual sites on In_(2)O_(3) via a sol-gel method.The Cu_(11)In_(9) intermetallic compound enhances H_(2) adsorption capacity and strength,and increases oxygen vacancy concentration on the catalyst surface,thereby improving CO_(2) activation and hydrogenation efficiency.Meanwhile,Co^(0) suppresses the desorption of the*CO species,facilitating its further hydrogenation to methanol.In-situ DRIFTS experiments indicate that the CO_(2) hydrogenation to methanol over CoCuInO-r follows the formate pathway.Compared with CuInO-r(containing Cu_(11)In_(9) on In_(2)O_(3)),CoCuInO-r exhibits a~20%increase in methanol selectivity and a 2-fold higher methanol space-time yield,reaching 7.68 mmol·g^(-1)·h^(-1) at 300℃ and 4 MPa.
基金
financial support from the National Key Research and Development Program of China(2022YFB4101800)
National Natural Science Foundation of China(22278298)
the Key Research&Development Program of Shandong Province,China(2024CXGC010410).
