环己烯水合制备环己醇的研究 Ⅰ.分子筛结构及晶粒大小的影响  

Studies on Production of Cyclohexanol by Hydration of Cyclohexene Ⅰ. Effects of Zeolite Structure and Crystal Size

作　　者：王殿中[1] 舒兴田[1] 何鸣元[1] 

机构地区：[1]中国石油化工股份有限公司石油化工科学研究院,北京100083

出　　处：《催化学报》2002年第6期503-506,共4页

基　　金：国家 973计划资助项目 (G2 0 0 0 0 480 0 5 )

摘　　要：考察了三种不同结构的分子筛 (ZSM 5 ,MCM 2 2及 β)以及不同晶粒大小的ZSM 5分子筛对环己烯水合反应的催化活性 .结果表明 ,具有 12元环孔道体系的 β分子筛对环己烯的转化率 (9 6 % )最高 ,但对环己醇的选择性 (35 4 % )最差 .MCM 2 2分子筛的活性很低 ,其环己烯转化率只有 0 8% .而孔口为 10元环结构的ZSM 5分子筛则具有较高的活性 (环己烯转化率7 5 % )和产物选择性 (99 2 % ) ,因此是较好的水合催化剂 .ZSM 5分子筛的晶粒大小对其环己烯水合反应活性有明显的影响 ,分子筛晶粒越细 ,则水合反应活性越高 ,其原因在于晶粒变细增大了分子筛的外比表面积 ,从而增加了接近孔口处的活性中心的数量 .The effects of the structure of zeolites (ZSM 5, MCM 22 and β) and the crystal size of ZSM 5 on their activity and selectivity for the hydration of cyclohexene were investigated. The results showed that β, which has channels formed by 12 membered rings, had the highest conversion of cyclohexene and the lowest selectivity for cyclohexanol because of the high yields of dimeric of cyclohexene and dicyclohexyl ether. MCM 22 had the lowest activity of 0 8% and ZSM 5 with 12 membered ring channels gave a good activity of 7 5% and a good selectivity for cyclohexanol more than 99%. ZSM 5 was the better catalyst for the hydration of cyclohexene. The crystal size of ZSM 5 significantly affected the hydration of cyclohexene. The smaller the crystal size of ZSM 5 was, the higher the zeolite activity. This was because when the crystal size decreased, the number of the adsorption sites located near the pore mouth on the external surface of zeolite increased.

关 键 词：结构 晶粒大小 环己烯 水合 环己醇 ZSM-5分子筛 催化剂 

分 类 号：O624[理学—有机化学]