引入SiO_2对SO_4^(2-)/ZrO_2超强酸体系的影响

Influence of Adding SiO2 into ZrO2 onSO2-4/ZrO2 Solid Superacid

用共沉淀法和负载法制备了一系列ＳＯ２－４／ＺｒＯ２－ＳｉＯ２催化剂，详细研究了添加ＳｉＯ２对ＳＯ２－４／ＺｒＯ２超强酸样品的晶化、比表面、硫含量、超强酸性和异丙苯裂解及异丙醇脱水反应的影响．引入ＳｉＯ２会延迟ＺｒＯ２的晶化和晶相转变，减弱ＳＯ２－４／ＺｒＯ２体系的超强酸性。

A series of SO2-4/ZrO2SiO2 catalysts with different SiO2 amount were prepared by coprecipitation and coating methods. The effect of adding SiO2 into ZrO2 on the crystallization, surface area, sulfur content, superacidity of SO2-4/ZrO2 and cumene cracking and isopropanol dehydration was studied in detail. Adding SiO2 into ZrO2 retarded the crystallization and phase transformation of ZrO2, and decreased solid superacidity of SO2-4/ZrO2, but enhanced the catalytic activities of SO2-4/ZrO2 for cumene cracking and isopropanol dehydration.