Palladium Nanoparticle–Graphene Catalysts for Asymmetric Hydrogenation

• Published in: Catalysis letters Vol. 143; no. 6; pp. 539 - 546
• Main Authors: Szori, Kornel, Puskas, Robert, Szollosi, Gyorgy, Bertoti, Imre, Szepvolgyi, Janos, Bartok, Mihaly
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01.06.2013; Springer; Springer Nature B.V
• Subjects: Acrylic acid; Aliphatic compounds; Asymmetry; Carboxylic acids; Catalysis; Catalysts; Chemistry; Chemistry and Materials Science; Colloidal state and disperse state; Diffraction; Electrons; Enantiomers; Exact sciences and technology; General and physical chemistry; Graphene; Graphite; Hydrogenation; Industrial Chemistry/Chemical Engineering; Nanoparticles; Optical emission spectroscopy; Organic acids; Organometallic Chemistry; Palladium; Palladium catalysts; Photoelectrons; Physical and chemical studies. Granulometry. Electrokinetic phenomena; Physical Chemistry; Rain and rainfall; Raman spectroscopy; Spectrum analysis; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Transmission electron microscopy; X ray photoelectron spectroscopy; X-ray diffraction; X-rays; Cinchona alkaloid; Palladium; Enantioselective; Carboxylic acid; Graphene; Hydrogenation; Cinchona; Enantioselectivity; Nanoparticle; Transition metal; Heterogeneous catalysis; Alkaloid; Dicotyledones; Angiospermae; Rubiaceae; Spermatophyta; Platinoid; Catalyst
• ISSN: 1011-372X; 1572-879X
• DOI: 10.1007/s10562-013-1006-6

We report for the first time the application of palladium nanoparticle-graphene (Pd/Gn) catalysts in the asymmetric hydrogenation of aliphatic α,β-unsaturated carboxylic acids using cinchonidine as chiral modifier. Pd/Gns were prepared by deposition–precipitation from the aqueous phase over graphite oxide and subsequent simultaneous reduction of both the support and the metal precursor with NaBH 4 . The materials obtained were characterized by ICP optical emission spectroscopy, X-ray diffraction spectroscopy, Raman spectroscopy, transmission electron microscopy and X-ray photoelectron spectroscopy. We demonstrate that the Pd/Gns modified by cinchonidine can act as efficient catalysts in the asymmetric hydrogenation of α,β-unsaturated carboxylic acids for producing optically enriched saturated carboxylic acids. Graphical Abstract