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Direct reaction between silicon and methanol over Cu-based catalysts: investigation of active species and regeneration of CuCl catalyst

Author:
Wang, Aili, Zhang, Mingming, Yin, Hengbo, Liu, Shuxin, Liu, Mengke, Hu, Tongjie
Source:
RSC advances 2018 v.8 no.34 pp. 19317-19325
ISSN:
2046-2069
Subject:
catalysts, chlorination, cupric oxide, cuprous oxide, methanol, nitrogen, silicon, temperature
Abstract:
When a CuCl/Si mixture was pretreated at 200–240 °C in a N₂ atmosphere, trimethoxysilane was predominantly formed in the direct reaction of silicon with methanol. When the pretreatment temperatures were raised to 260–340 °C, tetramethoxysilane was favorably formed. The CuₓSiyClz species catalyzed the reaction between silicon and methanol to trimethoxysilane. Chlorination of the spent CuCl/Si mixture promoted the reaction between silicon and methanol to form both trimethoxysilane and tetramethoxysilane due to the recovery of the CuCl phase and the exposure of the metallic Cu⁰ phase. When Cu₂O, CuO, and Cu⁰ were used as the catalysts, tetramethoxysilane was formed as the main product.
Agid:
6185842