Synthesis of hierarchical nanocrystalline β zeolite as efficient catalyst for alkylation of benzene with benzyl alcohol

To develop an efficient solid acid catalysts for the Friedel-Crafts alkylation reaction, especially for involving bulky molecules, the direct synthesis of hierarchical nanocrystalline β zeolites were achieved by using amphiphilic organosilane ([(CH 3 O) 3 SiC 3 H 6 N(CH 3 ) 2 C 18 H 37 ]Cl, TPOAC) a...

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Bibliographic Details
Published in:RSC advances 2022-02, Vol.12 (8), p.4865-4873
Main Authors: Zhou, Pan, Liu, Meng-Nan, Luo, Qun-Xing, Zhang, Jianbo, Chen, Huiyong, Ma, Xiaoxun, Hao, Qing-Qing
Format: Article
Language:English
Subjects:
Acids
Alkylation
Benzene
Benzyl alcohol
Catalysts
Catalytic activity
Chemical synthesis
Chemistry
Crystal structure
Crystals
Hydrocarbons
Nanocrystals
Silicon dioxide
Zeolites
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Summary:To develop an efficient solid acid catalysts for the Friedel-Crafts alkylation reaction, especially for involving bulky molecules, the direct synthesis of hierarchical nanocrystalline β zeolites were achieved by using amphiphilic organosilane ([(CH 3 O) 3 SiC 3 H 6 N(CH 3 ) 2 C 18 H 37 ]Cl, TPOAC) as collaborative structure-directing agent (SDA). The growth evolution of β crystals and the influence of TPOAC/SiO 2 molar ratio on the mesoporous structure, crystal size, and acidic properties of β zeolites were investigated and discussed in detail. The characterization results reveal that intracrystalline mesopores and intercrystalline mesopores/macropores via the stacking of β nanocrystals were generated over the hierarchical β zeolites. Moreover, most of the strong acid sites were well remained compared with the conventional microporous β zeolite. Consequently, the hierarchical nanocrystalline β zeolite synthesized under the optimized synthesis conditions shows improved specific catalytic activity of acid sites (turnover number, TON) in alkylation of benzene with benzyl alcohol, which can be attributed to the integrated balance of considerable mesoporosity, accessibility of the acid sites, and well-remained strong acid sites in the hierarchical β zeolite. Hierarchical β zeolite with enhanced transport and specific catalytic activity of acid sites in Friedel-Crafts alkylation was achieved by using amphiphilic organosilane surfactant as mesopores-directing agent and crystal growth inhibitor.
ISSN:2046-2069
2046-2069
DOI:10.1039/d2ra00209d