HgCl_2-ZnCl_2-ScCl_3-CeCl_3/C低汞复合催化剂合成氯乙烯的催化机理  

Catalytic mechanism of HgCl_2-ZnCl_2-ScCl_3-CeCl_3/C low-mercury composite catalyst in the synthesis of vinyl chloride

作　　者：唐晓宁[1,2] 陈肖虎[1,2] 卢大磊[1] 薛安[3] 

机构地区：[1]贵州大学材料与冶金学院,贵阳550025 [2]贵州省冶金工程与过程节能重点实验室,贵阳550025 [3]贵州省冶金化工研究所,贵阳550002

出　　处：《功能材料》2015年第B12期88-92,共5页Journal of Functional Materials

基　　金：贵州省重大专项资助项目[黔科合重大专项字(2014)6001]

摘　　要：以氯化锌(ZnCl_2)、氯化钪(ScCl_3)和氯化铈(CeCl_3)为助催化剂,采用浸渍法制备氯乙烯(VCM)合成用低汞复合催化剂HgCl_2-ZnCl_2-ScCl_3-CeCl_3/C。研究了含稀土氯化物低汞复合催化剂在氯乙烯合成中的催化机理。结果表明,HgCl_2的催化机理遵循不对称合成反应立体选择性和立体专一性原则,按自由基和氢转移机理进行;稀土金属氯化物ScCl_3和CeCl_3与ZnCl_2和HgCl_2形成二维簇状螯合物,这增大了C2H2和HCl分子的活化百分数,提高了氯乙烯合成反应几率。Low-mercury composite catalysts （HgCl2-ZnCl2-ScCl3-CeCl3/C） were prepared by impregnation. ZnCl2, ScCl3 and CeCl3 were used as cocatalysts. Catalytic mechanism of HgCl2-ZnCl2-ScCl3-CeCl3/C in the synthesis of vinyl chloride （VCM） was studied. Mechanism research shows that the synthesis reaction abides by the principles of stereoselectivity and stereospecificity, followed free radicals and hydrogen transfer mechanism. ScCl3 , CeCl3, ZnCl2 and HgCl2 form multi-active centers two-dimension clustered chelate （TDCC）, which in crease the activated percentage of C2 H2 and HCl molecules and enhance the probability of synthesizing VCM.

关 键 词：低汞 催化剂 助催化机理 氯乙烯 

分 类 号：TQ325.3[化学工程—合成树脂塑料工业]