硝基苯
铂金
催化作用
硫黄
吸附
离解(化学)
X射线光电子能谱
硫脲
选择性
化学
催化剂中毒
无机化学
有机化学
催化剂载体
化学工程
工程类
作者
Jianxun Luo,Chong Yan,Dawei Ma,Yixin Chen,Min Tian,Haoxuan Xie,Ruihao Chen,Ji‐Wei Wu,Yaoyao Zhen,Limei Pan,Chunshan Lu,Feng Feng,Xiaoliang Xu,Qingtao Wang,Qunfeng Zhang,Xiaonian Li
标识
DOI:10.1016/j.apcata.2023.119198
摘要
Sulfur modification can effectively modulate the electronic properties of the active sites on the metal catalysts and thus tune the catalytic performance. In this paper, sulfur-modified Pt/C catalysts were prepared by impregnation with a certain amount of thiourea as the precursor for the selective hydrogenation of nitrobenzene (NB) to p-aminophenol (PAP). Under reaction conditions, the highest conversion achieved was 99.5% and the selectivity was 72.5%. The effects of sulfur source type and sulfur content on the structure and physicochemical properties of catalyst support and active site were investigated. Results of XPS, H2-TPD-Mass and IR indicated the presence of strong inter-electron interaction between S and Pt. The sulfur modified catalyst not only reduces the dissociation and adsorption strength of hydrogen by Pt, but also inhibits the adsorption strength of phenylhydroxylamine on the catalyst surface, preventing excessive hydrogenation of phenylhydroxylamine, and prompting Bamberger rearrangement to p-aminophenol.
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