Synthesis Of Copper And Its Oxide Icroparticles By Solution Phase Method Or Dimethyldichlorosilane

Organic silane compound shows advantages both of organic andinorganic materials. Methylchlorosilane is the most important monomerfor the production of Organic silane material, among whichdimethyldichlorosilane （M₂） is in the largest demand. The direct synthesisis the most popular way of M2production, which is strongly influencedby the catalyst. The most popular commercial catalyst is Cu-Cu₂O-CuOsysterm presently.The effect of conditions of solusion phase method to the material wasstudied. It was found that the temperature, aging time, type of solvent etchave a substantial effect on the particle size, morphology and Cu-Cu₂Oratio of Cu and its oxide.The as-synthesized Cu and its oxide were then characterized and used asmodel catalyst in direct synthesis. The effect of particle size, morphologyand Cu-Cu₂O ratio of catalyst to the direct synthesis was studied. It wasfound that:（1）The particle size of the Cu₂O microparticles has asubstantial effect on the M2selectivity, but has no obvious effect on the Si conversion （about12%）. The M₂selectivity over Cu₂O microparticleswith three size ranges of100¹50nm,0.5¹μm, and1²μm were86.48%，80.65%and74.31%, respectively. Surface morphology of Si andcontact mass at different stages shows that the carbon deposition isrelated to the catalyst size.（2）The morphology of the Cu₂O-CuOmicroparticles has a substantial effect on the M2selectivity and the Siconversion. The M2selectivity over microparticles of3kinds ofmorphology were73.94%,78.09%and83.89%, and the corresponding Siconversion were14.5%,16.0%and23.6%. The sliced catalyst causedmore dispersed Cu3Si and the less carbon deposition, which led to higherM2selectivity.（3） While pure Cu and Cu₂O was used to catalyze thedirect synthesis, Si conversions were both²4%and the M2selectivitywere51.5%and69.6%respectively. While Cu and Cu₂O mixedmicroparticls was used to catalyze the direct synthesis, M2selectivityincreased with the increasing Cu₂O content, and the maximum Siconversions was35%when Cu content was15.7%in catalyst. There wasan evident synergetic effect between Cu and Cu₂O, which increased withthe better homogenicity of Cu and Cu₂O.