Patent ID: 7626050

Claim:
A process for the preparation of alkylhalosilanes which comprises reacting an alkyl halide with a solid body formed of silicon in the presence of a catalytic system comprising (α) a copper catalyst and (β) a group of promoting additives, wherein said group comprises: an additive β1 chosen from metallic zinc, a zinc-based compound or a mixture thereof, an additive β2 chosen from tin, a tin-based compound or a mixture thereof, optionally, an additive β3 chosen from cesium, potassium, rubidium, a compound derived from these metals or a mixture thereof, wherein the copper catalyst (α) is in the form of metallic copper, a copper halide or a mixture thereof, and the solid body includes a supplementary promoting additive β4 wherein the additive β4 is an alkali metal hypophosphite, an alkaline earth metal hypophosphite, a metal hypophosphite or a mixture thereof.