AlCl3 modified Pd/Al2O3 catalyst for enhanced anthraquinone hydrogenation

doi:10.1016/j.cjche.2023.06.021

Abstract

Abstract: Anthraquinone hydrogenation to produce H₂O₂ is an economically interesting reaction with great industrial importance. Here, we report a series of Pd/xAl catalysts with different AlCl₃ contents by a conventional stepwise impregnation method. The optimal Pd/1.0Al catalyst exhibits a higher performance toward anthraquinone hydrogenation with 8.3 g·L^-1 hydrogenation efficiency, 99.5% selectivity and good stability, obviously superior to that of Pd/Al₂O₃ catalyst (5.2 g·L^-1 and 97.2%). Detailed characterization demonstrates that AlCl₃ can be grafted on the γ-Al₂O₃ support to obtain a modified support with abundant surface weak acid and Lewis acid, which can adsorb and activate anthraquinone. Meanwhile, its steric hindrance could isolate and disperse active metals to form more active sites. The synergies between metal sites and acid sites promotes the anthraquinone hydrogenation. Furthermore, the good stability after grafting AlCl₃ could attribute to the enhanced metal-support interaction inhibiting metal particles agglomeration and leaching.

Key words: AlCl₃, Pd-based catalyst, H₂O₂, Weak acid, Hydrogenation

摘要： Anthraquinone hydrogenation to produce H₂O₂ is an economically interesting reaction with great industrial importance. Here, we report a series of Pd/xAl catalysts with different AlCl₃ contents by a conventional stepwise impregnation method. The optimal Pd/1.0Al catalyst exhibits a higher performance toward anthraquinone hydrogenation with 8.3 g·L^-1 hydrogenation efficiency, 99.5% selectivity and good stability, obviously superior to that of Pd/Al₂O₃ catalyst (5.2 g·L^-1 and 97.2%). Detailed characterization demonstrates that AlCl₃ can be grafted on the γ-Al₂O₃ support to obtain a modified support with abundant surface weak acid and Lewis acid, which can adsorb and activate anthraquinone. Meanwhile, its steric hindrance could isolate and disperse active metals to form more active sites. The synergies between metal sites and acid sites promotes the anthraquinone hydrogenation. Furthermore, the good stability after grafting AlCl₃ could attribute to the enhanced metal-support interaction inhibiting metal particles agglomeration and leaching.

关键词: AlCl₃, Pd-based catalyst, H₂O₂, Weak acid, Hydrogenation

Qinqin Yuan, Jingyue Liang, Wei Li, Jinli Zhang, Cuili Guo. AlCl₃ modified Pd/Al₂O₃ catalyst for enhanced anthraquinone hydrogenation[J]. Chinese Journal of Chemical Engineering, 2023, 64(12): 271-280.

Qinqin Yuan, Jingyue Liang, Wei Li, Jinli Zhang, Cuili Guo. AlCl₃ modified Pd/Al₂O₃ catalyst for enhanced anthraquinone hydrogenation[J]. 中国化学工程学报, 2023, 64(12): 271-280.

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AlCl₃ modified Pd/Al₂O₃ catalyst for enhanced anthraquinone hydrogenation

AlCl₃ modified Pd/Al₂O₃ catalyst for enhanced anthraquinone hydrogenation

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