期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 59, 期 4, 页码 1548-1551出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201913660
关键词
diffusion barriers; interfaces; n-heptane; Pt; Beta; zeolite catalysis
资金
- National Natural Science Foundation of China [21706067]
- Shanghai Education Development Foundation
- Shanghai Municipal Education Commission [17CG29]
- Fundamental Research Funds for the Central Universities [222201714004, 222201718003]
- EPSRC Frontier Engineering Centre for Nature Inspired Engineering [EP/K038656/1]
- UK Catalysis Hub [EP/K014706/1]
- Chenguang Program
- EPSRC [EP/K038656/1, EP/K014706/1] Funding Source: UKRI
Applications of zeolites in catalysis are plagued by strong diffusion resistance, which results from limitations to molecular transport in micropores, across external crystal surfaces, but also across internal interfaces. The first type of diffusion resistance is well understood, the second is receiving increasing attention, while the diffusion barriers at internal interfaces remain largely unclear. We take Pt/Beta catalyzed isomerization of n-heptane as the model system to explore the role of internal diffusion barriers in zeolite catalysis. The two as-synthesized Pt/Beta catalysts have an identical Pt loading, similar Beta particle size and acidity, but different internal structures. A Pt/Beta crystal with no observable internal interfaces can be 180 % higher in activity and 22 % higher in selectivity than its counterpart with numerous internal interfaces. This can only be attributed to the strong transport barriers across internal interfaces, as supported by directly comparing the apparent diffusivities of the two Beta samples.
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