MgAPO-5-supported Pt-Pb-based novel catalyst for the hydrogenation of nitrobenzene to p-aminophenol

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• 作者：Shufang Wang ; ^{wangshufang@hebut.edu.cn} ; Beibei He ; Yanji Wang ; ^{yjwang@hebut.edu.cn} ; Xinqiang Zhao
• 关键词：p-Aminophenol ; Nitrobenzene hydrogenation ; Pt&ndash ; Pb based catalyst ; MgAPO-5 support ; Bifunctional catalyst
• 刊名：Catalysis Communications
• 出版年：2012
• 期刊代码：12_15667367
• 类别：ce
• 出版时间：5 July, 2012
• 卷：24
• 期：Complete
• 页码：109-113
• 文件大小：836 K

摘要

A series of MgAPO-5-supported Pt or bimetallic Pt-Pb catalysts of various Pt loadings were prepared for the hydrogenation of nitrobenzene (NB) to p-aminophenol (PAP). The structural modification and changes in the electronic properties of the catalysts were analyzed using temperature-programmed desorption of hydrogen, high-resolution transmission electron microscopy, and diffuse reflectance infrared Fourier transformation spectroscopy of the adsorbed carbon monoxide. Results show that Pb doping in Pt/MgAPO-5 catalyst decreases the hydrogenation rate of NB and phenylhydroxylamine simultaneously and increases PAP selectivity greatly. A possible reason for the improvement in the PAP selectivity of the Pb-Pt/MgAPO-5 is the increase in electron density of the Pt sites caused by the interaction of Pb and Pt. The decreased rate of NB hydrogenation over the modified Pb-Pt/MgAPO-5 catalyst can be improved considerably by increasing the reaction temperature or hydrogen pressure while maintaining a high PAP selectivity.