F−@d4r, a New Type of Acidic Catalytic Site in Zeolite

As a solid acid, zeolite has been widely used in many fields such as tail gas treatment, petrochemical engineering, and the fine chemical industry. F− has been widely used in the synthesis of pure silica or high silica zeolites. To balance the charge of organic structure directing agents (OSDA), F−...

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Bibliographic Details
Published inCatalysts Vol. 12; no. 8; p. 809
Main Authors Zhao, Yukai, Liang, Weichi, Wang, Yihan, Tong, Yan, Li, Zhanhong, Liang, Yuqian, Liu, Xiaolong, Jiang, Jiuxing
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.08.2022
Subjects
Catalysts
Catalytic activity
Chemical industry
Chemical reactions
Composite materials
Corrosion
double-4-rings
Fine chemicals
Fluorides
Fluorine
Porous materials
Roasting
Silica
Silicon dioxide
Spectrum analysis
Zeolites
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Summary:As a solid acid, zeolite has been widely used in many fields such as tail gas treatment, petrochemical engineering, and the fine chemical industry. F− has been widely used in the synthesis of pure silica or high silica zeolites. To balance the charge of organic structure directing agents (OSDA), F− is often found located at the center of the double-4-rings (d4r) of the as-made zeolites. During calcination, fluorine ion is removed with the OSDA. We screened a series of composition building units and found that d4r is capable to retain F− in zeolite structure. We introduce the F− back after the calcination to create an unprecedented type of acid site, i.e., F−@d4r in pure silica zeolites ITQ-12. The F−@d4r species is thermal stable up to 300 °C. ITQ-12 with F−@d4r shows substantial catalytic activity in Biginelli reaction. Furthermore, the catalytic performance is proved to be positive correlated with the presence of F−@d4r, indicating the mild acid catalytic property of F−@d4r.
ISSN:2073-4344
2073-4344
DOI:10.3390/catal12080809