摘要
分别采用沉淀法,水解法和溶胶凝胶法制备了负载型纳米TiO2/Al2O3复合载体,同时在复合载体表面负载SO42-制成SO42-/TiO2/Al2O3固体酸催化剂,并将此催化剂用于α-蒎烯异构化反应中.用XRD、FTIR,TPD等手段对催化剂的晶相结构、比表面积、孔径分布、表面酸性等进行了表征.结果表明,三种方法所制备的催化剂均为纳米级且拥有着丰富而规则的孔结构,水解法制备的SO42-/TiO2/Al2O3催化剂中TiO2的平均粒径(10.0 nm)较小,比表面积(172.88 m2/g)较大,平均孔径为3.926 nm,表面酸中心数和酸强度均高于沉淀法和溶胶凝胶法制备的催化剂,在α-蒎烯催化异化反应中的具有较高的活性,α-蒎烯转化率为82.76%.
Precipitation method, hydrolysis method, Sol-gel method were applied to prepare the nano-meter supported TiO2/Al2O3 composite supports. Catalyst of SO4^2-/TiO2/Al2O3 which were prepared by supporting SO4^2- on the surface of the composite supports were used in the isomerisation of α-pinene. Surface area, pore diameter, crystal structure and acid strength of the catalyst were characterized by X-ray diffracticn（XRD） , fourier transformation infra-red （FFIR）, and temperature-programmed desorption （TPD）, et al. The results indicated that the grain size of TiO2（ 10.0 nm） in the composite supports prepared by hydrolysis method was smaller with the bigger surface area （ 172.88 m^2/g） and average pore diameter of 3. 926 nm. The acid center and acid strengths were higher than all the others. The catalyst prepared by hydrolysis showed higher activity towards α-pinene isomerisation. α-pinene conversion ratio was 82.76%.
出处
《分子催化》
EI
CAS
CSCD
北大核心
2008年第5期443-448,共6页
Journal of Molecular Catalysis(China)
基金
广西科学研究与技术开发计划课题(桂科攻0630004-1D)
广西科学基金项目(桂科自0728217)资助课题
