1. Catalytic Isomerization of Dimethyltetralin over Silicon- and Boron-Modified H-BEA Zeolites
- Author
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Won Choon Choi, Na Young Kang, Woo Hyung Lee, Chul Wee Lee, Yong-Ki Park, Tong Chen, and Seung-Kyu Park
- Subjects
Inorganic chemistry ,chemistry.chemical_element ,General Chemistry ,Catalysis ,Tetraethyl orthosilicate ,Boric acid ,chemistry.chemical_compound ,chemistry ,Brønsted–Lowry acid–base theory ,Boron ,Zeolite ,Transalkylation ,Isomerization - Abstract
Silicon- and Boron-modified H-BEA(Si/Al ratio of 12.5) were prepared by chemical liquid deposition (CLD) of tetraethyl orthosilicate (TEOS) and post-modification method using boric acid, respectively. The catalytic performance of the modified H-BEA catalysts was evaluated for the isomerization of 2,7-dimethyltetralin (DMT) to 2,6-DMT. It was found that the silylation with TEOS passivated preferentially the external acid sites of H-BEA zeolite while the Boron passivated both of the external and internal acid sites. The strong Bronsted acid sites were responsible for the side reactions such as dealkylation, cracking and transalkylation and can be prevented effectively by the silylation and boronation of BEA zeolite.
- Published
- 2009
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