Method for making alkylhalosilanes with a reactivated contact mass is derived from the making alkylh

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Method for making alkylhalosilanes, which comprises reacting Alkyl halides with a silicon-containing contact mass comprises, characterized in that the contact mass is obtained by Reacting a spent contact mass, which in turn from the Making alkylhalosilanes originates with carbon dioxide at Temperatures > 100 °C, and wherein a pressure of 0.5-100 at. and adding fresh silicon and/or fresh promoters, selected from the group consisting the phosphorus or phosphorus compounds are consists of, zinc or zinc compounds, tin or tin compounds, aluminum or aluminum compounds, Sulfur or sulfur compounds and indium or indium.