Synthesis and Unique Catalytic Performance of Single-Site Ti-Containing Hierarchical Macroporous Silica with Mesoporous Frameworks

被引:52
作者
Kamegawa, Takashi [1 ]
Suzuki, Norihiko [1 ]
Che, Michel [2 ,3 ]
Yamashita, Hiromi [1 ]
机构
[1] Osaka Univ, Grad Sch Engn, Div Mat & Mfg Sci, Suita, Osaka 5650871, Japan
[2] Univ Paris 06, Inst Univ France, CNRS, UMR 7197, Paris, France
[3] Univ Paris 06, Lab React Surface, CNRS, UMR 7197, Paris, France
关键词
VISIBLE-LIGHT IRRADIATION; HETEROGENEOUS CATALYSTS; PHOTONIC CRYSTALS; POROUS SILICA; EPOXIDATION; PHASE; OXIDATION; ZEOLITES; OXIDE; DECOMPOSITION;
D O I
10.1021/la1048634
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Single-site Ti-containing hierarchical macroporous silica with mesoporous frameworks (Ti-MMS) was successfully prepared by a solvent evaporation method using organic surfactant and poly(methyl methacrylate) (PMMA) colloidal crystals as the template. The formation of a well-defined macroporous structure composed of mesoporous silica walls was characterized by SEM and TEM observations. The successful incorporation of tetrahedrally coordinated Ti oxide moieties within their frameworks was also confirmed by spectroscopic techniques such as UV-vis and XAFS measurements. Comparative studies revealed that Ti-MMS exhibited higher catalytic activities for the epoxidation of linear alpha-olefin compared to Ti-containing mesoporous silica without macropores (Ti-MS). The reaction rate was significantly enhanced on Ti-MMS depending on increases in the alkyl chain length of linear alpha-olefins. It was also found that Ti-MMS showed good catalytic performance in the selective epoxidation of methyl oleate, which is a kind of unsaturated fatty acid methyl ester (FAME), under acid-free reaction conditions with tert-butylhydroperoxide (TBHP) because of the advantages of the combination of hierarchical macroporous and mesoporous structures.
引用
收藏
页码:2873 / 2879
页数:7
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