ZrO2添加方法对CuO-ZnO-ZrO2催化剂性能的影响

研究了ZrO₂的两种加入法所得CuO-ZnO-ZrO₂催化剂对CO₂加H₂合成CH₃OH反应催化活性的影响,得到催化剂的最佳含量组成及各种操作条件下的活性规律。采用BET、XRD、TPR、XPS等手段对催化剂表面晶相组成、活性组分存在状态进行了探讨。

Effect of Adding ZrO_2 Methods on the Properties of CuO-ZnO-ZrO_2 Catalysts

The influence of preparation methods for catsalyst CuO-ZnO-ZrO2 on the activities for the reaction of rnethanol synthesis from CO2 and hydrogen is studied. The optimum composition of the catalysts has been obtained. BET, XRD, TPR and XPS were used to examine the crystal phases of catalysts and the state of active species. The adding methods of ZrO2 affect the ratios of various component to catalytic activity. Adding ZrO2 can increase the dispersion of active species and the surface area. The catalytic activities are not only related with the catalyst surface area, but also with the amount of bulky CuO, The activities and surface area of catalysts prepared from two solutions containing precipitate were higher than those of the catalysts made by adding ZrO2 powder. And the former has 75% CuO in bulk phase in the catalyst, the latter just has only 69% CuO in bulk phase. The state of active component CuO and its effect is also studied.