Effects of individual promoters on the Direct Synthesis of methylchlorosilanes

Alexander D. Gordon, B. J. Hinch, Daniel R. Strongin

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

The industrially relevant Direct Synthesis involves the reaction of methyl chloride with silicon in the presence of a copper catalyst (promoted with Zn, Sn, and P), termed the contact mass, to form methylchlorosilanes. In situ attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR) coupled with flow reactor studies was used to help understand the relationship between the composition of the working catalytic surface and product selectivity during reaction (1 bar CH3Cl at 300 °C). Promotion of copper-silicon contact masses with Sn and Zn increased the selectivity of the reaction for dimethyldichlorosilane compared to P-promoted and copper-silicon (unpromoted) contact masses. Results showed that the rate of Si conversion associated with the Sn-promoted contact mass was higher than the Si conversion rate associated with the Zn and unpromoted contact masses. ATR-FTIR results suggested that Sn promotion led to a stabilization and relatively high concentration of surface methyl species. In contrast to Sn or Zn promotion, P promotion led to significant methyl fragmentation on the contact mass surface, consistent with its relatively low selectivity toward dimethyldichlorosilane.

Original languageEnglish (US)
Pages (from-to)291-298
Number of pages8
JournalJournal of Catalysis
Volume266
Issue number2
DOIs
StatePublished - Sep 10 2009

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Physical and Theoretical Chemistry

Keywords

  • Attenuated total reflection
  • Dichloromethylsilane
  • Dimethyldichlorosilane
  • Fourier transform infrared spectroscopy
  • Methylchlorosilane
  • Trichloromethylsilane

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