One-step preparation of efficient cuprous chloride catalyst for direct synthesis of trimethoxysilane

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外文摘要：CuCl-based catalysts are the most commonly used catalysts for the"direct synthesis"of trimethoxysilane (M3). CuCl species are sensitive to air and water,and are prone to oxidation deactivation. When CuCl is directly used as a catalyst,it needs to be purified before the utilization,and the operating conditions for the catalyst preparation are relatively harsh,requiring the inert gas environment. Considering a high-temperature activation step required for CuCl-based catalysts used for catalyzing synthesis of M3 to form active phase Cu-Si alloys (CuxSi) with Si powder,in this work,a series of catalysts for the"direct synthesis"of M3 were obtained by a one-step high-temperature activation of the mixture of stable CuCl2 precursors,activated carbon-reducing agent,and Si powder,simultaneously achieving the reduction of CuCl2 to CuCl and the formation of active phase CuxSi alloys of CuCl with Si powder. The prepared samples were characterized through various characterization techniques,and investigated for the cat-alytic performance for the"direct synthesis"of M3. Moreover,the operation conditions were optimized,including the activation temperature,catalyst dosage,Si powder particle size,and reaction temperature. The characterization results indicate that during the one-step activation process,the CuCl2 precursor is reduced to CuCl,and the resulting CuCl simultaneously reacts with Si powder to form active phases Cu3Si and Cu15Si4 alloys. The optimal catalyst Sacm(250,0.8:10) exhibits a good catalytic activity with selectivity of 95％ and yield of 77％ for M3,and shows a good universality for various alcohol substrates. Further-more,the catalytic mechanism of the prepared catalyst for the"direct synthesis"of M3 was discussed.

外文关键词：

TrimethoxysilaneCuprous chlorideCatalysisCatalyst activationReductionActive phase formation

作者：

Jiaxin Zhang、Lu Wang、Zhiqiang Ma、Chuanjun Di、Guanghui Chen、Jipeng Dong、Jianlong Li、Fei Gao

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作者单位：

Key Laboratory of Multiphase Flow Reaction and Separation Engineering of Shandong Province,College of Chemical Engineering,Qingdao University of Science and Technology,Qingdao 266042,China

基金：

Key Research&Development Plan of Shandong Province the Major Scientific Technological Innovation ProjectsNatural Science Foundation of Shandong Province

项目编号：

2021ZDSYS13ZR2021MB135

出版年：

2024

DOI：

10.1016/j.cjche.2024.05.001

中国化学工程学报(英文版)

中国化工学会

中国化学工程学报(英文版)

CSTPCDEI

影响因子：0.818

ISSN：1004-9541

年,卷(期)：2024.71(7)