High-Resolution Single-Turnover Mapping Reveals Intraparticle Diffusion Limitation in Ti-MCM-41-Catalyzed Epoxidation

被引：104

作者：

De Cremer, Gert ^{[2
]}

Roeffaers, Maarten B. J. ^{[1
]}

Bartholomeeusen, Evelyne ^{[2
]}

Lin, Kaifeng ^{[2
]}

Dedecker, Peter ^{[1
]}

Pescarmona, Paolo P. ^{[2
]}

Jacobs, Pierre A. ^{[2
]}

De Vos, Dirk E. ^{[2
]}

Hofkens, Johan ^{[1
]}

Sels, Bert F. ^{[2
]}

机构：

[1] Katholieke Univ Leuven, Dept Chem, B-3001 Heverlee, Belgium

[2] Katholieke Univ Leuven, Dept Microbial & Mol Syst, B-3001 Heverlee, Belgium

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2010年 / 49卷 / 05期

关键词：

diffusion; epoxidation; fluorescent probes; heterogeneous catalysis; single-molecule studies; MOLECULE FLUORESCENCE SPECTROSCOPY; CATALYTIC-ACTIVITY; INTRACRYSTALLINE DIFFUSION; TI-MCM-41; NANOPARTICLES; MESOPOROUS MATERIALS; SELECTIVE OXIDATION; MICROSCOPY; LOCALIZATION; CRYSTALS; PROBES;

D O I：

10.1002/anie.200905039

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

(Figure Presented) Shedding light on catalysis: For the first time, transport phenomena and their influence on catalysis are directly observed for individual catalytic particles by single-turnover mapping using highresolution fluorescence microscopy. The Thiele modulus could be measured with just one experiment, proving the existence of diffusional limitations for the Ti-MCM-41 catalyzed epoxidation of a fluorescent reporter molecule (see picture; TBH P = tert-butylhydroperoxide). © 2010 Wiley-VCH Verlag GmbH & Co. KGaA.

引用

页码：908 / 911

页数：4

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