@article {Gazdag:2019:1533-4880:484, title = "Effect of Particle Restructuring During Reduction Processes Over Polydopamine-Supported Pd Nanoparticles", journal = "Journal of Nanoscience and Nanotechnology", parent_itemid = "infobike://asp/jnn", publishercode ="asp", year = "2019", volume = "19", number = "1", publication date ="2019-01-01T00:00:00", pages = "484-491", itemtype = "ARTICLE", issn = "1533-4880", eissn = "1533-4899", url = "https://www.ingentaconnect.com/content/asp/jnn/2019/00000019/00000001/art00064", doi = "doi:10.1166/jnn.2019.15770", keyword = "Heterogeneous Catalysis, Transfer-Hydrogenation, Enantioselective Hydrogenation, Transmission Electron Microscopy, Polydopamine, Palladium", author = "Gazdag, Tam{\’a}s and Bar{\’o}thi, {\’A}d{\’a}m and Juh{\’a}sz, Kopp{\’a}ny Levente and Kunfi, Attila and N{\’e}meth, P{\’e}ter and S{\’a}pi, Andr{\’a}s and Kukovecz, {\’A}kos and K{\’o}nya, Zolt{\’a}n and Szori, Korn{\’e}l and London, G{\’a}bor", 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 investigation 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 dependent 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.", }