催化作用
甲醇
选择性
吸附
电子转移
无机化学
氧化还原
价(化学)
化学
核化学
物理化学
有机化学
作者
Shiqiang Wang,Jinhai Yang,Shiwei Wang,Fang Xiao,Ning Zhao
出处
期刊:Chemcatchem
[Wiley]
日期:2022-11-09
卷期号:14 (23)
被引量:8
标识
DOI:10.1002/cctc.202200957
摘要
Abstract A series of Cu−Mn−(La)−Zr catalysts with molecular ratios of 6 : 3 : (0.35) : 1 was synthesized by sol‐gel (CMLZ−S), co‐precipitation (CML−CP, CMLZ−CP) and hydrothermal (CMLZ−H) methods, respectively. The effects of the Mn and La on the activity of catalysts were investigated. It was found that the addition of La promoted the formation of the medium basic sites. Mn acted as an electronic promotor that transfer electrons through redox reactions, causing other metals to exhibit different valence states, thus promoting the adsorption and activation of H 2 and CO 2 . At a certain temperature, methanol selectivity decreased in the order of CMLZ−H>CMLZ−S>CMLZ−CP>CMZ−CP. The selectivity of methanol is correlated with the distribution of basic sites. For the CMLZ−H catalyst, the highest percentage of moderate basic sites facilitated the activation of CO 2 , resulting in the highest selectivity of methanol. The CO 2 conversion was correlated with the Cu specific surface area.
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