Selective Semihydrogenation of Alkynes on Shape‐Controlled Palladium Nanocrystals |
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| Authors: | Jooyoung Chung Chanhoi Kim Hansaem Jeong Prof Taekyung Yu Do Huy Binh Prof Jyongsik Jang Prof Jaichan Lee Prof B Moon Kim Prof Byungkwon Lim |
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| Institution: | 1. Department of Chemistry, College of Natural Sciences, Seoul National University, Seoul 151‐747 (Korea), Fax: (+82)?2‐872‐7505;2. World Class University (WCU) program of Chemical Convergence for Energy & environment (C2E2), School of Chemical and Biological Engineering, Seoul National University, Seoul 151‐747 (Korea);3. Department of Chemical Engineering, College of Engineering, Kyung Hee University, Youngin 446‐701 (Korea);4. School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon 440‐746 (Korea) |
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| 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. |
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| Keywords: | chemoselectivity hydrogenation nanocrystals nanocubes palladium |
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