title: Selective semihydrogenation of alkynes on shape-controlled palladium nanocrystals.
abstract: A systematic study on the selective semihydrogenation of alkynes to alkenes on shape-controlled palladium (Pd) nanocrystals was performed. Pd nanocrystals with a cubic shape and thus exposed {100} facets were synthesized in an aqueous solution through the reduction of Na2PdCl4 with L-ascorbic acid in the presence of bromide ions. The Pd nanocubes were tested as catalysts for the semihydrogenation of various alkynes such as 5-decyne, 2-butyne-1,4-diol, and phenylacetylene. For all substrates, the Pd nanocubes exhibited higher alkene selectivity (>90 %) than a commercial Pd/C catalyst (75-90 %), which was attributed to a large adsorption energy of the carbon-carbon triple bond on the {100} facets of the Pd nanocubes. Our approach based on the shape control of Pd nanocrystals offers a simple and effective route to the development of a highly selective catalyst for alkyne semihydrogenation.
authors.affiliation: Department of Chemistry, College of Natural Sciences, Seoul National University, Seoul, Korea.
authors.forename: Jooyoung
authors.initials: J
authors.lastname: Chung
authors.forename: Chanhoi
authors.initials: C
authors.lastname: Kim
authors.forename: Hansaem
authors.initials: H
authors.lastname: Jeong
authors.forename: Taekyung
authors.initials: T
authors.lastname: Yu
authors.forename: Do Huy
authors.initials: DH
authors.lastname: Binh
authors.forename: Jyongsik
authors.initials: J
authors.lastname: Jang
authors.forename: Jaichan
authors.initials: J
authors.lastname: Lee
authors.forename: B Moon
authors.initials: BM
authors.lastname: Kim
authors.forename: Byungkwon
authors.initials: B
authors.lastname: Lim
mesh_terms: D000475:Alkenes / Q000138:chemical synthesis* / Q000737:chemistry; D000480:Alkynes / Q000737:chemistry*; D006865:Hydrogenation; D015394:Molecular Structure; D053758:Nanoparticles / Q000737:chemistry*; D010165:Palladium / Q000737:chemistry*; D010316:Particle Size; D013499:Surface Properties
chemical_list: D000475:Alkenes; D000480:Alkynes; D010165:Palladium