期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 54, 期 6, 页码 1836-1840出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201410236
关键词
BrOnsted acidity; fluid catalytic cracking; fluorescence; single-molecule microscopy; zeolites
资金
- Netherlands Organisation for Scientific Research (NWO) Gravitation program (Netherlands Center for Multiscale Catalytic Energy Conversion, MCEC)
- European Research Council (ERC) [321140]
- Fonds voor Wetenschappelijk Onderzoek [G0197.11]
- KU Leuven Research Fund [OT/12/059]
- Belspo [IAP-VII/05]
- Flemish government [METH/08/04]
- ERC [307523]
- European Research Council (ERC) [307523] Funding Source: European Research Council (ERC)
Fluid catalytic cracking (FCC) is a major process in oil refineries to produce gasoline and base chemicals from crude oil fractions. The spatial distribution and acidity of zeolite aggregates embedded within the 50-150m-sized FCC spheres heavily influence their catalytic performance. Single-molecule fluorescence-based imaging methods, namely nanometer accuracy by stochastic chemical reactions (NASCA) and super-resolution optical fluctuation imaging (SOFI) were used to study the catalytic activity of sub-micrometer zeolite ZSM-5 domains within real-life FCC catalyst particles. The formation of fluorescent product molecules taking place at BrOnsted acid sites was monitored with single turnover sensitivity and high spatiotemporal resolution, providing detailed insight in dispersion and catalytic activity of zeolite ZSM-5 aggregates. The results point towards substantial differences in turnover frequencies between the zeolite aggregates, revealing significant intraparticle heterogeneities in BrOnsted reactivity.
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