水热改性SO_4^(2-)/TiO_2-WO_3催化环己醇脱水合成环己烯  

Preparation of SO_4^(2-)/TiO_2-WO_3 Through Hydrothermal Modification and Its Application to Catalytic Dehydration of Cyclohexanol to Cyclohexene

作　　者：王燕[1] 黎先财[1] 曹小华[1] 

机构地区：[1]南昌大学化学系,江西南昌330047

出　　处：《南昌大学学报（理科版）》2007年第4期361-364,共4页Journal of Nanchang University(Natural Science)

基　　金：江西省自然科学基金资助项目(0520037)

摘　　要：以钛酸四丁酯为原料,十六烷基三甲基溴化铵(CTAB)作模板剂,通过水热法制备出介孔TiO2。将TiO2与H2WO4混合,用1 mol/L H2SO4浸渍制得SO42-/TiO2-WO3固体超强酸。以催化环己醇脱水制备环己烯为探针反应,采用IR、XRD对催化剂进行表征。结果表明,在优化条件下,即反应温度为170~180℃,w(催化剂)=5.3%,反应时间为45 m in,环己烯收率可达95.6%。催化剂重复使用5次后收率仍可达88.9%。使用5次后的催化剂经再生后,环己烯收率可达95.3%。水热法制备的催化剂比普通方法制备的催化剂烯收率提高5.65%。Mesoporous TiO2 was prepared by hydrothermal method with Tetrabutyl titanate and Cetyhrimethylammonium bromide, then the solid superacid SO4^2-/TiO2-WO3 was obtained by impregnating above mixtures with 1 mol/L HESO4. The catalyst was applied in the catalytic synthesis of cyclohexene from cyclohexanol and was characterized by IR,XRD. The results showed that when the experiment conditions were optimum, i. e. , w（ catalyst） = 5.3% , the reaction temperature was in the range of 170 - 180 ℃ ,the reaction time was 45 min, the yield of cyclohexene could reach 95.6 %. The catalyst could be reused for 5 times and the yield was still above 88.9%. If the catalyst which had been reused for five times was regenerated, then its activities could be enhanced as high as the fresh one. Catalyst prepared by this method has a 5.65% higher yield than the catalyst prepared by the ordinary method.

关 键 词：水热法 SO4^2-/TIO2-WO3 环己烯 环己醇 

分 类 号：TQ031.2[化学工程]