Effects of Synthesis Method on the Localization of Aluminum Atoms and on Catalytic Performance of BEA Zeolite in Toluene Disproportionation

The physicochemical properties of BEA zeolites with SiO 2 /Al 2 O 3 ratios of about 40–50 and 200–250 synthesized in fluoride and alkaline media have been characterized, and their catalytic activity have been tested in liquid-phase disproportionation of toluene. It has been found that samples with a...

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Bibliographic Details
Published in:Petroleum chemistry 2024, Vol.64 (2), p.202-209
Main Authors: Kostyukov, I. A., Ponomareva, O. A., Kolyagin, Yu. G., Petz, M. I., Shutkina, O. V., Bok, T. O., Ivanova, I. I.
Format: Article
Language:English
Subjects:
Aluminum oxide
Catalytic activity
Chemistry
Chemistry and Materials Science
Disproportionation
Industrial Chemistry/Chemical Engineering
Liquid phases
Localization
Silicon dioxide
Synthesis
Toluene
Zeolites
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Summary:The physicochemical properties of BEA zeolites with SiO 2 /Al 2 O 3 ratios of about 40–50 and 200–250 synthesized in fluoride and alkaline media have been characterized, and their catalytic activity have been tested in liquid-phase disproportionation of toluene. It has been found that samples with a close SiO 2 /Al 2 O 3 ratio obtained by fluoride synthesis have a smaller number of acid sites. The samples with lower SiO 2 /Al 2 O 3 ratios exhibite a higher activity in toluene disproportionation than the samples with lower Al content, regardless of the synthesis method. The BEA zeolites that have Al atoms in the T6 positions of the framework which are more active. Synthesis in an alkaline medium promotes the localization of aluminum at the T6 position.
ISSN:0965-5441
1555-6239
DOI:10.1134/S0965544124010067