Approach to generating the right active phase in the “Direct” synthesis of trimethoxysilanes using the CuCl-Cu2O catalyst

Kai Su; Yongjun Ji; Xiwen Zhou; Xingyu Jiang; Huifang Li; Yongxia Zhu; Jing Li; Hezhi Liu; Junping Xiao; Ziyi Zhong; Fabing Su

doi:10.1016/j.apsusc.2020.148915

Approach to generating the right active phase in the “Direct” synthesis of trimethoxysilanes using the CuCl-Cu₂O catalyst

Kai Su, Yongjun Ji^*, Xiwen Zhou, Xingyu Jiang, Huifang Li, Yongxia Zhu, Jing Li, Hezhi Liu, Junping Xiao, Ziyi Zhong, Fabing Su

^*Corresponding author for this work

Chemical Engineering

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

The “direct” synthesis of trimethoxysilane (M3) by the reaction of Si with methanol over the CuCl catalyst often generates a large amount of erosive HCl gas, causing severe environmental pollution. Thus, it calls for the development of greener and more efficient composite catalysts. In this work, to reduce the amount of CuCl, we employed three pretreatment methods to activate the contact mass of Si powder and the composite catalyst of CuCl and Cu₂O. It was found that the contact mass activated by argon (Ar), hydrogen argon (H₂/Ar) and methyl chloride (CH₃Cl), respectively, exhibited different catalytic performances: the highest Si conversion (34.1%) and M3 yield (24.0%) were obtained on the sample activated by CH₃Cl. Notably, the M3 yield was increased 8-fold than that of the un-activated sample. The X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) studies revealed that different activation methods led to the generation of different kinds of Cu_xSi phases, such as Cu₃Si and Cu₄Si, both of which gradually transformed into Cu₁₅Si₄ during the reaction process. Pretreatment of the contact mass with CH₃Cl promoted the formation of Cu_xSi, which contributed to the generation of more Cu₁₅Si₄ active phase, and finally to the superior catalytic performance.

Original language	English
Article number	148915
Journal	Applied Surface Science
Volume	544
DOIs	https://doi.org/10.1016/j.apsusc.2020.148915
State	Published - 1 Apr 2021

Keywords

Active phase
Catalytic performance
Composite catalyst
Pretreatment
Trimethoxysilane

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This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.apsusc.2020.148915

Cite this

@article{f57683c7d52e491ab216a4585f6c536d,

title = "Approach to generating the right active phase in the “Direct” synthesis of trimethoxysilanes using the CuCl-Cu2O catalyst",

abstract = "The “direct” synthesis of trimethoxysilane (M3) by the reaction of Si with methanol over the CuCl catalyst often generates a large amount of erosive HCl gas, causing severe environmental pollution. Thus, it calls for the development of greener and more efficient composite catalysts. In this work, to reduce the amount of CuCl, we employed three pretreatment methods to activate the contact mass of Si powder and the composite catalyst of CuCl and Cu2O. It was found that the contact mass activated by argon (Ar), hydrogen argon (H2/Ar) and methyl chloride (CH3Cl), respectively, exhibited different catalytic performances: the highest Si conversion (34.1%) and M3 yield (24.0%) were obtained on the sample activated by CH3Cl. Notably, the M3 yield was increased 8-fold than that of the un-activated sample. The X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) studies revealed that different activation methods led to the generation of different kinds of CuxSi phases, such as Cu3Si and Cu4Si, both of which gradually transformed into Cu15Si4 during the reaction process. Pretreatment of the contact mass with CH3Cl promoted the formation of CuxSi, which contributed to the generation of more Cu15Si4 active phase, and finally to the superior catalytic performance.",

keywords = "Active phase, Catalytic performance, Composite catalyst, Pretreatment, Trimethoxysilane",

author = "Kai Su and Yongjun Ji and Xiwen Zhou and Xingyu Jiang and Huifang Li and Yongxia Zhu and Jing Li and Hezhi Liu and Junping Xiao and Ziyi Zhong and Fabing Su",

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AU - Su, Kai

AU - Ji, Yongjun

AU - Zhou, Xiwen

AU - Jiang, Xingyu

AU - Li, Huifang

AU - Zhu, Yongxia

AU - Li, Jing

AU - Liu, Hezhi

AU - Xiao, Junping

AU - Zhong, Ziyi

AU - Su, Fabing

PY - 2021/4/1

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AB - The “direct” synthesis of trimethoxysilane (M3) by the reaction of Si with methanol over the CuCl catalyst often generates a large amount of erosive HCl gas, causing severe environmental pollution. Thus, it calls for the development of greener and more efficient composite catalysts. In this work, to reduce the amount of CuCl, we employed three pretreatment methods to activate the contact mass of Si powder and the composite catalyst of CuCl and Cu2O. It was found that the contact mass activated by argon (Ar), hydrogen argon (H2/Ar) and methyl chloride (CH3Cl), respectively, exhibited different catalytic performances: the highest Si conversion (34.1%) and M3 yield (24.0%) were obtained on the sample activated by CH3Cl. Notably, the M3 yield was increased 8-fold than that of the un-activated sample. The X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) studies revealed that different activation methods led to the generation of different kinds of CuxSi phases, such as Cu3Si and Cu4Si, both of which gradually transformed into Cu15Si4 during the reaction process. Pretreatment of the contact mass with CH3Cl promoted the formation of CuxSi, which contributed to the generation of more Cu15Si4 active phase, and finally to the superior catalytic performance.

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