The use of CO₂ to produce higher alcohols is a promising route to reduce emissions and make a profit. However, low activity of existing catalysts is a barrier for such processes to reach the industrial level. Here we report a novel K-Co promoted In₂O₃ catalyst for CO₂ hydrogenation to higher alcohols. The K-Co promoted In₂O₃ with an optimum K and Co of 2.5 and 5.0 wt% achieves a high C₂₊OH space time yield of 169.6 g kg_cat^-1 h^-1 with the excellent C₂₊OH distribution of 87.4% in the total alcohols, while a very low space time yield of C₂₊OH (0.4 g kg_cat^-1 h^-1) is obtained over In₂O₃ promoted with 5 wt% Co. Characterization results reveal that, after reduction with H₂ at 380 ^oC for 2 h, K-O-Co species is created for K-Co promoted In₂O₃ (2.5 wt% K and 5 wt% Co) sample which significantly reduces a number of weak H₂ adsorption and strengthens the interaction of adsorbed H compared to 5 wt% Co promoted In₂O₃ sample containing a mixture of Co⁰ and CoO. The reduction of weak H₂ adsorption and the improved interaction of adsorbed H with the catalyst surface retard the hydrogenation ability, allowing the CO insertion into adsorbed C_xH_y species prior to its hydrogenation to form hydrocarbon, resulting in a remarkable reduction of CH₄ and higher hydrocarbon, and significant improvement of higher alcohols.

使用CO ₂生产高级醇是减少排放和盈利的有前途的途径。然而，现有催化剂的低活性是此类工艺达到工业水平的障碍。在这里，我们报告了一种新型 K-Co 促进的 In ₂ O ₃催化剂，用于将 CO ₂氢化为高级醇。K-Co 促进的 In ₂ O ₃具有 2.5 和 5.0 wt% 的最佳 K 和 Co，实现了169.6 g kg _cat ^-1 h ^-1的高 C ₂₊ OH 时空产率，具有优异的 C ₂₊ OH 分布占总醇的 87.4%，而 C _{2+ 的}时空产率非常低OH (0.4 g kg _cat ^-1 h ^-1 ) 是通过 In ₂ O ₃获得的，用 5 wt% Co 促进。表征结果表明，在 380 ^o C 下用 H ₂还原2 h 后，产生了 KO-Co 物种对于 K-Co 促进的 In ₂ O ₃（2.5 wt% K 和 5 wt% Co）样品，与 5 wt% Co 促进的 In ₂ O ₃样品相比，这显着减少了许多弱 H ₂吸附并加强了吸附的 H 的相互作用含有 Co ⁰和 CoO的混合物。弱H ₂的还原吸附和吸附的 H 与催化剂表面的改进相互作用阻碍了加氢能力，允许 CO在加氢形成烃之前插入吸附的 C _x H _y物种，导致 CH ₄和高级烃的显着减少，并且显着高级醇的改进。