| he direct synthesis of dimethyldichlorosilane (DMDCS) was studied by reacting contact masses containing copper-silicon alloy and metallic promoters with gaseous methyl chloride in a fixed bed reactor. The purpose of the study was to determine the role of metallic promoters in affecting the reactivity and selectivity of the contact masses for the direct synthesis. The promoters which were studied included aluminum, zinc, and tin, and the combinations aluminum-tin and zinc-tin. Contact masses were prepared from high purity reagents, so that the effects of the promoters on reactivity and selectivity could be isolated.;The average reaction rate of the direct synthesis reaction for the contact masses studied at 623 K decreased in the following order: SiCuZnSn... |
