Work

Comparison of Brønsted Acidic Silanol Nests and Lewis Acidic Metal Sites in Ti-Beta Zeolites for Conversion of Butenes

Year: 2024

Type: article

Abstract: 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.

Source: Catalysts

DOI: 10.3390/catal14110749

Authors: Fengjiao Yi, Mengjiao Xing, Jing-Pei Cao, Shupeng Guo, Yong Yang

Institutions: China University of Mining and Technology, State Power Investment Corporation (China), Chinese Academy of Sciences, Institute of Coal Chemistry, State Key Laboratory of Coal Conversion

Language: English

Topic: Zeolite Catalysis and Synthesis

Subfield: Inorganic Chemistry

Field: Chemistry

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $3,069

Funders: National Natural Science Foundation of China, Natural Science Foundation of Shanxi Province