期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 61, 期 24, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202203603
关键词
Acidity; Crystallographically Distinct Oxygen Atoms; IR Spectroscopy; NMR Spectroscopy; Zeolites
资金
- National Creative Research Initiative Program [2021R1A3A3088711, 2021K2A9A2A06039845, FY2021]
- National Research Foundation of Korea
- National Natural Science Foundation of China [21733013, 22161132028, 22111540254]
- Youth Innovation Promotion Association
- Chinese Academy of Sciences
- National Research Foundation of Korea [2021R1A3A3088711, 2021K2A9A2A06039845] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
A clear understanding of the acidic properties of bridging Si-OH-Al groups in zeolites is crucial for optimizing their performance as catalysts. This study reveals the existence of previously unrecognized bridging Si-OH-Al groups in LTA zeolite with different crystallographic oxygen atoms compared to known Bronsted acid sites. The synthesis and properties of the specific type of bridging OH groups in zeolites depend on the content and spatial distribution of framework Al atoms.
A clear understanding of the acidic properties of bridging Si-OH-Al groups containing crystallographically different oxygen atoms in zeolites is a prerequisite for optimizing their performance as industrial solid catalysts and developing new acid-catalyzed reactions, but presents many challenges. Here, we report the direct observation of yet unrecognized bridging Si-OH-Al groups in the LTA zeolite whose oxygen atoms are crystallographically different from those of already known Bronsted acid sites. We also report that the creation of a crystallographically particular type of bridging OH groups in zeolites and its concentration and acid strength can vary strongly with the content and spatial distribution of framework Al atoms, thus being synthetic in nature, which has been rationalized in terms of the secondary building unit concept.
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