Effect of Copper Content on the Direct Process of Organosilane Synthesis from Silicon and Methyl Chloride |
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Authors: | Wuxi Luo,
, Guoliang Zhang, ý , Guangrun Wang, Ú ,Jinfu Wang,
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Affiliation: | aDepartment of Chemical Engineering, Tsinghua University, Beijing 100084, China;bJilin Chemical Corporation, Jilin 132022, China |
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Abstract: | The effect of copper concentration on the performance of the catalytic reaction between silicon and methyl chloride was investigated using online gas chromatogram. The catalyst concentration greatly in-fluences various aspects of the direct organosilane synthesis process, including the reaction rate, the selec-tivity, and the silicon conversion. The reaction activity and the silicon conversion increase as the catalyst concentration increases. However, the reaction selectivity decreases for the catalyst concentrations more than 9 wt.%. The cross-sections of deactivated contact mass particles were observed by optical microscopy and analyzed by scanning electron microscope combined with energy dispersive X-ray detector (SEM-EDX). The observations showed that a textured substance formed on the original flat surface of the silicon particles after deactivation with copper only in a shallow surface layer of the contact mass. This indicates that the copper diffusion is the rate limiting step which causes the reaction deactivation. |
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Keywords: | direct process copper concentration reaction activity reaction selectivity silicon conversion online gas chromatogram (GC) scanning electron microscope combined with energy disper-sive X-ray detector (SEM-EDX) |
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