Catalytic cracking of CH3Cl on copper-based phases

The methylchlorosilanes synthesis from Si and CH3Cl, also called the direct synthesis suffers from a side-reaction during which the CH3Cl reactant cracks and forms carbonaceous compounds, called coke. It leads to deactivation of the Cu3Si active phase formed by reaction of Si and a Cu precursor. Thi...

Full description

Saved in:
Bibliographic Details
Published in:Catalysis science & technology 2022-01, Vol.12 (6), p.2006-2014
Main Authors: Blaser, Eugénie, Rosier, Cécile, Huet, Michel, Geantet, Christophe, Loridant, Stéphane
Format: Article
Language:English
Subjects:
Carbon
Carbon black
Catalysis
Catalytic cracking
Chemical Sciences
Coke
Copper
Copper chloride
Deactivation
Organic chemistry
Phases
Selectivity
Silicon dioxide
Stoichiometry
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The methylchlorosilanes synthesis from Si and CH3Cl, also called the direct synthesis suffers from a side-reaction during which the CH3Cl reactant cracks and forms carbonaceous compounds, called coke. It leads to deactivation of the Cu3Si active phase formed by reaction of Si and a Cu precursor. This paper deals with the CH3Cl cracking on the copper-based phases CuCl and Cu, without and with Si (during the direct synthesis). In the former case, the two phases were supported either on carbon black or on silica. Both CuCl and Cu were shown to be active phases with similar reaction rate and the stoichiometry of the CH3Cl cracking was determined from the selectivity values. Cu turns into CuCl by reacting with CH3Cl. CuCl is stable on SiO2 while it is reduced on carbon black support which is chlorinated during the cracking. This key result reveals an original effect of coke since it favours formation of metallic Cu inactive for the direct synthesis in addition to covering the active sites leading to deactivation.
ISSN:2044-4753
2044-4761
DOI:10.1039/d1cy02226a