In:
Reaction Chemistry & Engineering, Royal Society of Chemistry (RSC), Vol. 7, No. 3 ( 2022), p. 769-780
Abstract:
We report the results of studies on the direct synthesis of tetraalkoxysilanes from alcohols and metallic silicon in a high-pressure mechanochemical reactor. The effect of the following factors on the process was considered: temperature (100–250 °C), amount of catalyst (0–20 wt%), type of catalyst, and type of the alcohol used in the synthesis. A silicon conversion of 90% with a selectivity of 94% with respect to a tetraalkoxysilane can be attained under optimal conditions. The studies showed that the temperature of the direct synthesis of alkoxysilanes was the lowest of the values reported to date (100 °C). Under these conditions, a silicon conversion of 77% and a selectivity of 98% with respect to a tetraalkoxysilane can be attained. It was shown that CuCl (20 wt%) exhibited the highest activity among copper-based catalysts, including CuF 2 , CuCl, CuBr, CuI, CuO, and Cu 2 O. In addition to MeOH, such alcohols as EtOH, n -BuOH, and EtO(CH 2 ) 2 OH were used. The contact masses (CMs) sampled after 15 and 25 minutes and after reactions at 150, 200, and 250 °C were studied using SEM-EDX, PXRD, and XPS.
Type of Medium:
Online Resource
ISSN:
2058-9883
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2022
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