Comparison of Brønsted Acidic Silanol Nests and Lewis Acidic Metal Sites in Ti-Beta Zeolites for Conversion of Butenes
The Lewis acidic framework Ti sites in Ti-Beta and Si-Beta catalysts were compared by FT-IR and NMR characterization methods before they were applied to the conversion of four butenes. The results showed that Si-Beta has fewer Lewis acid sites and abundant weak Brønsted acidic silanol nests, which play an important role in conversions between n-butene, cis-2-butene, and trans-2-butene. The conversions for these butenes over Si-Beta were always higher than those over a series of Ti-Beta catalysts with gradient-varied Lewis acidic framework Ti sites and silanols. This is because isobutene can only oligomerize, which requires stronger acidity, so its conversion over Si-Beta was lower than those over Ti-Beta zeolites. For a series of Ti-Beta catalysts with different abundances of Lewis acidic Ti sites, the more Lewis acid sites it had, the higher the conversions for the four butenes.
Authors
- Fengjiao Yi
- Mengjiao Xing
- Shupeng Guo (ORCID: https://orcid.org/0000-0003-3439-299X)
- Jing‐Pei Cao (ORCID: https://orcid.org/0000-0002-1544-7441)
- Yong Yang
Institutions
- China University of Mining and Technology (CN)
- State Power Investment Corporation (China) (CN)
- Institute of Coal Chemistry (CN)
Publication Details
- Journal
- Catalysts
- Published
- 2024-10-23
- DOI
- https://doi.org/10.3390/catal14110749
- Citations
- 2
- Primary Topic
- Zeolite Catalysis and Synthesis
- Type
- article
- Field-Weighted Citation Impact
- 0.32
Funders
- National Natural Science Foundation of China
- Natural Science Foundation of Shanxi Province