三乙氧基硅烷
催化作用
选择性
材料科学
润湿
双金属片
化学工程
浸出(土壤学)
涂层
有机化学
纳米技术
化学
复合材料
土壤水分
土壤科学
工程类
环境科学
作者
Rong Guo,Guannan He,Xinyu Chen,Xinyue Zhang,Zenan Hu,Xiaodong Li,Dapeng Niu,Hong Sun
标识
DOI:10.1002/admi.202100013
摘要
Abstract Surface wettability of heterogeneous catalysts plays a crucial role in the catalytic activity and selectivity. In this work, an ultra‐thin modified silica coating is firstly used as the “skin” to adjust the surface hydrophilicity of the catalyst, which promotes the catalytic activity and selectivity in the transfer hydrogenation of nitriles. The ultrathin‐modified silica “skin” with 2–3 nm thickness is fabricated by the consecutive hydrolysis of (3‐aminopropyl)triethoxysilane and n ‐propyltriethoxysilane, and the bimetallic catalyst Fe 3 O 4 @PtCu is encapsulated in the coating. The modified catalyst demonstrated significant catalytic efficiency for hydrogenation of benzonitrile to dibenzylamine. The reaction performs 93% conversion and 99% selectivity in “green” solvent H 2 O. Furthermore, the modified silica “skin” encapsulates the PtCu nanoparticles to prevent the leaching of active sites, thus brings excellent catalytic recyclability. More than Fe 3 O 4 @PtCu, the modified silica “skin” is applicable to a diverse range of catalysts, that is, PtCu/SiO 2 , PtCu/Al 2 O 3 , and PtCu/UiO‐66, endowing them with additional catalytic activity and selectivity in the hydrogenation of nitriles.
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