通过原位红外和H₂-TPD表征，比较研究了由共沉淀法(CMLZ-CP)、溶胶凝胶法(CMLZ-S)、水热法(CMLZ-H)制备的Cu-Mn-La-Zr催化剂上二氧化碳加氢制甲醇的反应历程。结果表明，催化剂表面羟基对二氧化碳加氢制甲醇反应有一定的促进作用，并且催化剂上的二氧化碳加氢反应均遵循甲酸盐(HCOO^*)和羧酸盐(COOH^*)路径。CMLZ-CP和CMLZ-H催化剂更倾向于羧酸盐路径，而CMLZ-S催化剂更倾向于甲酸盐路径。CMLZ-CP催化剂有最强的H₂活化能力，从而表现出最高的CO₂转化率和甲醇产率，而CMLZ-H催化剂有更高的中强碱性位点和氧缺陷占比，使得中间物种更倾向于加氢合成甲醇，从而表现出最高的甲醇选择性。

The reaction routes for the CO₂ hydrogenation to methanol over a series of Cu-Mn-La-Zr catalysts prepared by different methods, viz., CMLZ-CP by co-precipitation, CMLZ-S by sol-gel method and CMLZ-H by hydrothermal method, were comparatively investigated by in-situ DRIFT and H₂-TPD characterization. The results indicate that the surface hydroxyl groups on these catalysts contribute to the CO₂ hydrogenation to methanol and the reaction may follow the formate (HCOO*) and carboxylate (COOH*) routes. The carboxylate pathway is preferred for the reaction over the CMLZ-CP and CMLZ-H catalysts, whereas the formate pathway dominates in the reaction over the CMLZ-S catalyst. The CMLZ-CP catalyst shows the strongest ability to activate H₂ and thus exhibits the highest CO₂ conversion and methanol yield. In contrast, the CMLZ-H catalyst has high percentage of medium to strong basic sites and oxygen defects, which favor the hydrogenation of intermediate species to methanol, and thus exhibits the highest selectivity to methanol.