Evidence of Preferential Aluminum Site Loss during Reaction-Induced Dealumination
Understanding the mechanism of steam-induced dealumination of zeolite catalysts is of high relevance for tuning their performance and stability in multiple industrial processes. A combination of <sup>27</sup>Al and <sup>1</sup>H-<sup>1</sup>H double-quantum single-quantum magic angle spinning nuclear magnetic resonance and diffuse-reflectance ultraviolet-visible spectroscopies identified a preferential dealumination of tetrahedral aluminum sites in H-ZSM-5 zeolites. Framework aluminum atoms facing channels display reactivity toward steam higher than that of those in their intersections. Dealumination randomly occurs on isolated and proximate sites. However, the concentration of the latter sites decays more prominently. These findings contribute to a better understanding of the stability of zeolite catalysts in the presence of steam.
Authors
- Jeroen A. van Bokhoven (ORCID: https://orcid.org/0000-0002-4166-2284)
- Vladimir Paunović (ORCID: https://orcid.org/0000-0001-6630-1672)
- Andreas Brenig (ORCID: https://orcid.org/0000-0002-7863-8763)
- Jun Xu (ORCID: https://orcid.org/0000-0003-2741-381X)
- Chao Wang (ORCID: https://orcid.org/0000-0001-8367-5211)
- Feng Deng (ORCID: https://orcid.org/0000-0002-6461-7152)
Institutions
- Chinese Academy of Sciences (CN)
- Paul Scherrer Institute (CH)
- ETH Zurich (CH)
- Wuhan Institute of Physics and Mathematics (CN)
Publication Details
- Journal
- Journal of the American Chemical Society
- Published
- 2024-12-10
- DOI
- https://doi.org/10.1021/jacs.4c13212
- Citations
- 10
- Primary Topic
- Zeolite Catalysis and Synthesis
- Type
- article
- Field-Weighted Citation Impact
- 1.58
Funders
- National Natural Science Foundation of China
- Eidgenössische Technische Hochschule Zürich
- Youth Innovation Promotion Association of the Chinese Academy of Sciences
- National Key Research and Development Program of China