The critical role of Zr in controlling the activity of Pd/Beta on the hydrogenation of phenol to cyclohexanone

doi:10.1016/j.cjche.2022.07.033

摘要/Abstract

摘要： The promoting effect of zirconium addition on Pd/Beta catalysts has been investigated in the selective hydrogenation of phenol to cyclohexanone in the aqueous phase. The activity of the catalyst in the reaction was greatly improved by introducing Zr atoms into the framework of H-Beta zeolite. An important synergy between the Zr species and Pd, affecting the Pd dispersion state on the support, has been observed. The modification of the support with Zr⁴⁺ improves the Lewis/Brønsted acid ratio of the catalyst, suppressing the further transformation of cyclohexanone. The kinetics of Pd/Zr-Beta catalyst showed high selectivity to cyclohexanone. The catalytic results showed that the Pd/Zr-Beta had the best catalytic performance at the desired temperature of 80 ℃ for 5 h.

关键词: Palladium, Phenol hydrogenation, Cyclohexanone, Zirconium, Zeolite

Abstract: The promoting effect of zirconium addition on Pd/Beta catalysts has been investigated in the selective hydrogenation of phenol to cyclohexanone in the aqueous phase. The activity of the catalyst in the reaction was greatly improved by introducing Zr atoms into the framework of H-Beta zeolite. An important synergy between the Zr species and Pd, affecting the Pd dispersion state on the support, has been observed. The modification of the support with Zr⁴⁺ improves the Lewis/Brønsted acid ratio of the catalyst, suppressing the further transformation of cyclohexanone. The kinetics of Pd/Zr-Beta catalyst showed high selectivity to cyclohexanone. The catalytic results showed that the Pd/Zr-Beta had the best catalytic performance at the desired temperature of 80 ℃ for 5 h.

Key words: Palladium, Phenol hydrogenation, Cyclohexanone, Zirconium, Zeolite

Bin Gao, Junwen Chen, Qi Zuo, Hongyan Wang, Wenlin Li. The critical role of Zr in controlling the activity of Pd/Beta on the hydrogenation of phenol to cyclohexanone[J]. 中国化学工程学报, 2023, 57(5): 79-87.

Bin Gao, Junwen Chen, Qi Zuo, Hongyan Wang, Wenlin Li. The critical role of Zr in controlling the activity of Pd/Beta on the hydrogenation of phenol to cyclohexanone[J]. Chinese Journal of Chemical Engineering, 2023, 57(5): 79-87.

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