Insights into the Stability of Pd/CN Catalyst in Liquid Phase Hydrogenation of Phenol to Cyclohexanone: Role of Solvent
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The production of cyclohexanone by liquid phase phenol hydrogenation is sustainable and green. In this work, the effect of solvent, i.e., water and organic solvents (cyclohexane, methanol and acetone) on the stability of Pd/CN catalyst in the production of cyclohexanone by selective phenol hydrogenation was investigated, and the mechanism is explored by comprehensive characterizations. The results suggest that the solvent has significant effect on the reusability of Pd/CN catalyst in phenol hydrogenation, and the catalytic performance of Pd/CN increases gradually in water but decreases in organic solvents with the reaction cycle. The results of XRD, TEM and XPS confirm that the Pd/CN catalyst maintains wonderful dispersion of Pd NPs and forms more ratio of Pd (0) in water with the reaction cycle, while the opposite results are found in cyclohexane (organic solvents). The results of XPS, TG and BET suggest that the Pd/CN catalyst adsorbs continually phenol in water with the reaction cycle, which inhibits the agglomeration of Pd NPs and promotes the formation of Pd (0), thus better catalytic stability. This work would aid the efficient industrial production of cyclohexanone over Pd/CN.
KeywordsPhenol hydrogenation Cyclohexanone Pd/CN Stability Solvent
The financial supports from the National Key R&D Program (2016YFB0301503) and the National Natural Science Foundation (21776127) of China are gratefully acknowledged.
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