CO₂ hydrogenation to methanol is of great significance for the emission control and utilization of CO₂. In this work, the Rh/In₂O₃ catalyst with high Rh dispersion was prepared by deposition-precipitation method. The catalyst characterization demonstrates that the highly dispersed Rh species promotes the dissociative adsorption and spillover of hydrogen, which further enhances not only the formation of surface oxygen vacancy of In₂O₃ but also CO₂ adsorption and activation. Enhanced activity was thereby achieved for selective hydrogenation of CO₂ to methanol. A CO₂ conversion of 17.05 % with methanol selectivity of 56.06 %, corresponding to a methanol space time yield (STY) up to 0.54 g_MeOH h⁻¹ g_cat⁻¹, has been obtained under 300 °C, 5 MPa, 76/19/5 of H₂/CO₂/N₂ (molar ratio) and 21,000 cm³ h⁻¹ g⁻¹ of gas hourly space velocity. Under the same reaction condition, the CO₂ conversion is only 9.38 % with a methanol STY of 0.34 g_MeOH h⁻¹ g_cat⁻¹ over In₂O₃. The methanol selectivity can be even higher than 70 % at the reaction temperatures below 275 °C for Rh/In₂O₃ catalyst.

CO ₂加氢制甲醇对控制和利用CO ₂具有重要意义。本文采用沉积沉淀法制备了高Rh分散度的Rh / In ₂ O ₃催化剂。催化剂的表征表明，高度分散的Rh物种促进了氢的解离吸附和溢出，这不仅进一步增强了In ₂ O ₃的表面氧空位的形成，而且还增强了CO _2的吸附和活化。由此实现了增强的活性，用于将CO ₂选择性氢化为甲醇。一氧化碳₂在300°C，5 MPa，76/19/5下获得了17.05％的转化率和56.06％的甲醇选择性，相当于高达0.54 g _MeOH  h ^-1 g _cat ^-1的甲醇时空产率（STY）H ₂ / CO ₂ / N ₂（摩尔比）和21,000 cm ³  h ^-1 g ^-1气体时空速度。在相同的反应条件下，在In ₂ O ₃上的甲醇STY为0.34 g _MeOH  h ^-1 g _cat ^-1时，CO ₂转化率仅为9.38％。对于Rh / In ₂ O ₃催化剂，在低于275°C的反应温度下，甲醇的选择性甚至可以高于70％。