H_2SO_4-SiO_2固体酸的结构及酸性研究  

Preparation and Characterization of H_2SO_4-SiO_2 Solid Acid

作　　者：辛秀兰[1] 谢文华[2] 王晶[2] 付强[2] 舒兴田[2] 闵恩泽[2] 

机构地区：[1]北京工商大学化工学院,北京100037 [2]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：《分子催化》2004年第2期98-103,共6页Journal of Molecular Catalysis(China)

基　　金：国家重点基础研究规划项目(课题编号:G2000048002).

摘　　要：以溶胶-凝胶法制备了H2SO4-SiO2固体酸催化剂,并对其结构和酸性进行了系统表征.FT-IR和29Si-NMR结果表明H2SO4和SiO2间存在相互作用,因此硫酸与硅胶形成稳定的固体.XRD、SEM和TEM结果表明,H2SO4-SiO2固体酸是一多孔无定型材料;BET法测定的H2SO4-SiO2固体酸的比表面积和孔体积结果表明,随着H2SO4与SiO2质量比增加,其比表面减少,孔体积增大;H2SO4-SiO2固体酸的酸强度和液体浓硫酸相当,酸强度与干燥温度和H2SO4加入量有关,固体酸的这一性质以1H-MASNMR进行了系统的表征.H_2SO_4-SiO_2 solid acid was synthesized by a sol-gel method. The structure, stability, acidity of as-prepared material were studied by SEM, XRD, BET, FT-IR, +(29)Si-MAS NMR and+(1)H-MAS NMR .The characterization results of FT-IR and NMR confirmed that H_2SO_4 is combined with the amorphous SiO_2. ((\)+(1)H-)MAS NMR investigations showed that it has high acidic strength. It was found that the acidity of the solid acid was enhanced by increasing of drying temperature and also influenced by acid ratio in the silica.

关 键 词：固体酸 溶胶-凝胶 H2SO4-SiO2 ^1H—MAS NMR 

分 类 号：O643.32[理学—物理化学]