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CO2 hydrogenation over differently morphological CeO2‐supported Cu‐Ni catalysts

Differently morphological CeO2‐supported Cu‐Ni catalysts utilized for carbon dioxide hydrogenation to methanol were prepared by the method of impregnation. The 100‐ to 300‐nm CeO2 nanorod‐supported catalyst dominantly exposed low‐energy (100) and (110) facets, and the Cu‐Ni supported on 10‐ to 20‐nm CeO2 nanospheres and on irregular CeO2 nanoparticles were both enclosed by (111) facets owning high energy. Besides, all CeO2‐supported Cu‐Ni catalysts possess oxygen vacancies, which can active and absorb CO2 and is further beneficial for the reaction. Most oxygen vacancies were generated from the Ce4+ reduction to Ce3+ with the ceria lattice cell expansion, and small amount of oxygen vacancies resulted from the Ce4+ replacement by Cu or/and Ni atom. Because of the exposed (100) and (110) facets and numerous oxygen vacancies, well‐defined CeO2 nanorod‐supported Cu‐Ni alloy showed more superior catalytic performance than on CeO2 nanospheres and nanoparticles.