A series of x wt.% CuO/Ce_0.4Zr_0.6O₂ (x = 2, 5, 15, 25, 35 and 40) catalysts obtained by oxalate co-precipitation method are characterized by XRD, BET, SEM, Raman, EPR, H₂-TPR, CO₂/H₂-TPD and high pressure (3 MPa) in situ DRITFS techniques in order to elucidate the effect of CuO loading on the catalytic activity of CO₂ hydrogenation to methanol. Catalytic activity results demonstrate that CO₂ conversion and methanol selectivity enhance with an increase of the CuO loading until it reaches the maximum values at a CuO loading of 35 wt.%, while further addition of CuO inhibits the catalytic performance. The higher CO₂ conversion of 7.0 % (13.2 %) and methanol selectivity of 96.4 % (71.8 %) are obtained over 35 wt.% CuO/Ce_0.4Zr_0.6O₂ catalyst at 220 °C (280 °C) and 3 MPa. The excellent performance of 35 wt.% CuO/Ce_0.4Zr_0.6O₂ is attributed to the presence of adequate copper species with higher copper surface area and larger number of Cu-Ce-Zr solid solution. These two features are benefit to provide larger number of activated hydrogen atom and promote CO₂ adsorption, respectively, which are the key to the hydrogenation reaction related to the hydrogen dissociation and the activation of the carbon dioxide.

通过XRD，BET，SEM，Raman，EPR对通过草酸盐共沉淀法获得的一系列x wt。％CuO / Ce _0.4 Zr _0.6 O ₂（x = 2、5、15、25、35和40）催化剂进行了表征，H ₂ -TPR，CO ₂ / H ₂ -TPD和高压（3 MPa）原位DRITFS技术，以阐明CuO负载量对CO ₂加氢制甲醇的催化活性的影响。催化活性结果表明，CO ₂随着CuO负载量的增加，转化率和甲醇选择性增强，直到在35wt。％的CuO负载量下达到最大值，而进一步添加CuO会抑制催化性能。在220°C（280°C）和3 MPa的压力下，在35 wt。％CuO / Ce _0.4 Zr _0.6 O ₂催化剂上可获得7.0％（13.2％）的更高的CO ₂转化率和96.4％（71.8％）的甲醇选择性。35 wt。％CuO / Ce _0.4 Zr _0.6 O ₂的卓越性能这归因于存在具有较高铜表面积和大量Cu-Ce-Zr固溶体的适当铜物种。这两个特征分别有利于提供更多的活化氢原子并促进CO ₂吸附，这是与氢离解和二氧化碳活化有关的氢化反应的关键。