催化作用
甲醇
吸附
选择性
化学
固溶体
氨
降水
无机化学
化学工程
动力学
活化能
有机化学
材料科学
物理
工程类
气象学
量子力学
作者
Feng Sha,Shan Tang,Chizhou Tang,Zhendong Feng,Jijie Wang,Can Li
出处
期刊:Chinese Journal of Catalysis
[China Science Publishing & Media Ltd.]
日期:2023-01-16
卷期号:45: 162-173
被引量:34
标识
DOI:10.1016/s1872-2067(22)64176-7
摘要
ZnZrOx solid solution catalyst is an excellent catalyst in methanol synthesis from CO2 hydrogenation. It is still highly aspiration to make any further improvement in catalytic performance. In this work, ZnZrOx solid solution catalyst is prepared with different methods, resulting in different surface property. The ZnZrOx solid solution catalyst prepared by reflux ammonia (ZnZrOx-RA) exhibits higher methanol selectivity of 95.2% and CO2 conversion of 3.3% than that of the catalyst obtained via co-precipitation (ZnZrOx-CP) at 280 °C, 5 MPa. Subsequent kinetics analysis shows that ZnZrOx-RA, in comparison to ZnZrOx-CP, shows a decreased activation energy for methanol synthesis, an increased reaction order in H2, and a similar reaction order in CO2. Structural characterizations indicate that these two catalysts are in solid solution state, while ZnZrOx-RA possesses more Zn-OH species on the surface. The surface Zn-OH species enhance the activation and adsorption of CO2 and H2, and improve the generation and stability of HCOO* species, which promote CO2 hydrogenation to methanol.
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