Heteropoly acid encapsulated into zeolite imidazolate framework (ZIF-67) cage as an efficient heterogeneous catalyst for Friedel-Crafts acylation

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• 作者：Muhammad Ammar ; Sai Jiang ; Shengfu Ji ; ^{jisf@mail.buct.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; ^{2071658081@qq.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Heteropoly acid ; Encapsulate ; Zeolite imidazolate framework ; Catalyst ; Friedel&ndash ; Crafts acylation
• 刊名：Journal of Solid State Chemistry
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：233
• 期：Complete
• 页码：303-310
• 全文大小：1216 K

文摘

A new strategy has been developed for the encapsulation of the phosphotungstic heteropoly acid (H₃PW₁₂O₄₀ denoted as PTA) into zeolite imidazolate framework (ZIF-67) cage and the PTA@ZIF-67(ec) catalysts with different PTA content were prepared. The structure of the catalysts was characterized by XRD, BET, SEM, FT-IR, ICP-AES and TG. The catalytic activity and recovery properties of the catalysts for the Friedel-Crafts acylation of anisole with benzoyl chloride were evaluated. The results showed that 14.6–31.7 wt% PTA were encapsulated in the ZIF-67 cage. The PTA@ZIF-67(ec) catalysts had good catalytic activity for Friedel-Crafts acylation. The conversion of anisole can reach ~100% and the selectivity of the production can reach ~94% over 26.5 wt% PTA@ZIF-67(ec) catalyst under the reaction condition of 120 °C and 6 h. After reaction, the catalyst can be easily separated from the reaction mixture by the centrifugation. The recovered catalyst can be reused five times and the selectivity can be kept over 90%.