由铜精矿制备有机硅单体合成反应三元铜催化剂及其性能

Synthesis and Characterization of Cu-Cu_2O-CuO Catalyst from Copper Concentrate and Its Catalytic Performance in Rochow Reaction of Organosilicon Monomers

采用铜精矿焙烧-酸浸-置换法得到铜粉,经部分氧化-球磨制备三元铜催化剂Cu-Cu2O-Cu O,对所制样品进行了表征,用固定床评价了其对有机硅反应制备单体二甲基二氯硅烷(M2)的催化性能.结果表明,与置换铜相比,三元铜催化剂的M2选择性和硅粉转化率明显提高,置换铜的M2选择性和硅粉转化率分别为34.6%和15.7%,经773K部分氧化和球磨后,Cu-Cu2O-Cu O的M2选择性可达82.0%,硅粉转化率可达57.1%.三元铜催化剂独特的催化性能归因于其较小的粒径及反应过程中形成更多的活性合金相CuxSi,反应符合催化-吸附机理.

Copper powder was obtained from the copper concentrate via the roasting-acid leaching-displacement process,followed by partial oxidation and ball milling,the three-component Cu-based catalyst was prepared,and characterized.The catalytic properties were then investigated by using the Rochow reaction on a lab fixed-bed reactor.The results indicated that the obtained ternary Cu-based catalyst,Cu-Cu2O-CuO,exhibited much improved M2 selectivity（82.0%） and silicon conversion（57.1%） in comparison with displaced Cu powder,which gave a very low M2 selectivity of 34.6% and silicon conversion of 15.7%,respectively.The physical and chemical properties of the contact masses before and after the reaction verified that the enhanced catalytic performance of Cu-Cu2O-CuO catalyst was ascribed to the smaller particle size and much more active phase of CuxSi alloy formed during the reaction,which was consistent with the adsorption oxidation mechanism.