Role of metallic promoters in the direct synthesis of methylchlorosilanes

Journal Article · Mon Apr 01 04:00:00 EST 1991 · Journal of Catalysis; (USA)

DOI:https://doi.org/10.1016/0021-9517(91)90304-M· OSTI ID:5530515

Gasper-Galvin, L D; Sevenich, D M; Friedrich, H B; Rethwisch, D G ^[1]

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1. Univ. of Iowa, Iowa City (USA)

Overall reaction rates and selectivities for dimethyldichlorosilane were determined for the direct reaction of silicon with methyl chloride to produce methylchlorosilanes. Copper was used as the catalyst, and zinc, tin, and aluminum were investigated as promoters. To unambiguously determine effects of the promoters, high-purity reagents were used for contact mass sample preparation. Others have reported that tin significantly increases both reaction rate and selectivity for samples prepared using technical grade silicon. However, promotion of high purity samples with tin alone (i.e., SiCuSn) significantly decreased both the reaction rate and selectivity. These conflicting results are explained in terms of the aluminum impurities present in technical grade silicon. Tin is suggested to promote this reaction synergistically with zinc and aluminum by lowering the melting points and surface tensions of the catalyst/promoter alloys which form on the surface.

• OSTI ID: 5530515
• Journal Information: Journal of Catalysis; (USA), Journal Name: Journal of Catalysis; (USA) Vol. 128:2; ISSN 0021-9517; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALLOYS
ALUMINIUM
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHLORINATED ALIPHATIC HYDROCARBONS
COPPER
ELEMENTS
HALOGENATED ALIPHATIC HYDROCARBONS
HYDRIDES
HYDROGEN COMPOUNDS
INTERMETALLIC COMPOUNDS
KINETICS
MELTING POINTS
METALS
METHYL CHLORIDE
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC SILICON COMPOUNDS
PHYSICAL PROPERTIES
PROMOTERS
REACTION KINETICS
SEMIMETALS
SILANES
SILICON
SILICON COMPOUNDS
SURFACE PROPERTIES
SURFACE TENSION
SYNTHESIS
THERMODYNAMIC PROPERTIES
TIN
TRANSITION ELEMENTS
TRANSITION TEMPERATURE
ZINC