采用湿法浸渍法在介孔Co/CeO_2-δ催化剂上构建包括金属Co、表面氧空位和Co⁰-CeO_2-δ界面结构的表面活性中心，表面活性中心可以通过Co物种的剂量来调节。金属Co和CeO_2-δ之间的相互作用能促进表面氧空位和Co⁰-CeO_2-δ界面结构的形成，有利于抑制高温环境中Co物种的聚集和烧结。所制备的Co/CeO_2-δ催化剂比单组分Co和CeO_2-δ催化剂具有更好的CO₂加氢催化性能，这归因于Co⁰活性中心、表面氧空位和Co⁰-CeO_2-δ界面结构之间的协同作用。因此，Co/CeO_2-δ催化剂对反应物CO₂和H₂分子具有较强的吸附和活化能力，提高了CO₂加氢活性。在常压和400 °C下，Co负载量为12%的Co/CeO_2-δ催化剂上的CO₂转化率和CH₄选择性分别达到59.7%和95.7%，并在9个循环中保持了良好的稳定性。

Guilin Zhou*, Shan Zhao, Fengqiong Xie, Shuang Chen, Hongmei Xie. Construction of surface active centers on the mesoporous Co/CeO_2-δ catalysts for CO₂ hydrogenation [J]. International Journal of Hydrogen Energy, 2023, 48(74): 28980–28997. https://doi.org/10.1016/j.ijhydene.2023.04.107

The surface active centers, which include metal Co, surface oxygen vacancies, and Co⁰-CeO_2-δ interface structures, can be constructed on the mesoporous Co/CeO_2-δ catalysts by wet impregnation method. And the surface active centers can be regulated by the Co species dosage. The interaction between the metal Co and CeO_2-δ can promote surface oxygen vacancies and Co⁰-CeO_2-δ interface structures to be formed and be conducive to inhibit the aggregation and sintering of Co species in high temperature environment. The prepared Co/CeO_2-δ catalysts have better catalytic performances for CO₂ hydrogenation than the single component Co and CeO_2-δ catalysts, which can be attributed to the synergistic effect between Co⁰ active centers, surface oxygen vacancies, and Co⁰-CeO_2-δ interface structures. Therefore, the Co/CeO_2-δ catalysts have strong adsorption and activation ability for reactant CO₂ and H₂ molecules to improve the CO₂ hydrogenation activity. At atmospheric pressure and 400 °C, the CO₂ conversion and CH₄ selectivity on the Co/CeO_2-δ catalyst with Co loading of 12 % could reach 59.7 % and 95.7 %, respectively, and maintained good stability in 9 cycles for CO₂ hydrogenation reaction.