Direct synthesis and catalytic activity of ordered large pore titanium-substituted spherical SBA-15 molecular sieves

被引：5
|
作者：
Chen, Shengwen [1 ]
Ma, Changwen [1 ]
Qin, Minmin [2 ]
Yang, Haifeng [2 ]
Xie, Hongyong [1 ]
Guan, Jie [1 ]
机构：
[1] Shanghai Second Polytech Univ, Sch Urban Dev & Environm Engn, Shanghai 201209, Peoples R China
[2] Shanghai Normal Univ, Sch Biol & Environm Sci, Shanghai 200234, Peoples R China
来源：
REACTION KINETICS MECHANISMS AND CATALYSIS | 2012年 / 106卷 / 01期
关键词：
Titanium; SBA-15; Spherical; Cyclohexene epoxidation; MESOPOROUS SBA-15; OXIDATION; SILICA;
D O I：
10.1007/s11144-012-0426-4
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Titanium substituted highly ordered SBA-15 spheres with a diameter about 5 mu m in a ternary P123-H2O-HCl-TEOS system were prepared by the hydrothermal method and the catalytic activity in the epoxidation of cyclohexene was studied. The synthesized materials were characterized by XRD, ICP-AES, FT-IR, BET and SEM, UV-Vis and N-2 adsorption/desorption isotherms. The results show that incorporation of titanium into the framework of SBA-15 makes the surface area, pore diameter and pore volume increase and the pore walls slimmer than pure SBA-15. When the titanium content is above a critical value, TiO2 anatase forms on the material surface. The Ti-SBA-15 materials showed good catalytic activity for the oxidation of cyclohexene. The catalytic activity increases with an increase of Ti content and decreases when anatase TiO2 clusters are formed.
引用
收藏
页码：245 / 256
页数：12
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