Effect of particle restructuring during reduction processes over polydopamine-supported Pd nanoparticles

Gazdag, T. and Baróthi, Á. and Juhász, Koppány Levente and Kunfi, Attila and Németh, Péter and Sápi, András and Kukovecz, Ákos and Kónya, Zoltán and Szőri, Kornél and London, Gábor (2019) Effect of particle restructuring during reduction processes over polydopamine-supported Pd nanoparticles. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, 19 (1). pp. 484-491. ISSN 1533-4880

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Abstract

The effect of catalyst restructuring on the polydopamine-supported Pd catalyzed transfer hydrogenation of ethyl 4-nitrobenzoate and the catalytic hydrogenation of (E)-2-methyl-2-butenoic acid is reported. Transmission electron microscopy Delivered investigation by Ingenta of different catalyst pre-treatment and reaction conditions revealed high catalytic activity in both reactions unless drastic aggregation of the active metal occurred. In the transfer hydrogenation reaction aggregation was primarily depen- dent on the H-source used, while in the catalytic hydrogenation additives in combination with the reductive environment led to extensive Pd aggregation and thus decreased catalytic activity. The enantioselective hydrogenation of (E)-2-methyl-2-butenoic acid showed increased enantioselectivity and decreased conversion with increased particle size.

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