Supported Noble Metal Catalysts and Adsorbents with Soft Lewis Acid Functions |
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| Authors: | Dr Haruno Murayama Dr Qi-An Huang Dr Eiji Yamamoto Prof?Dr Makoto Tokunaga Dr Tamao Ishida Dr Mitsutaka Okumura Dr Tetsuo Honma Dr Tadahiro Fujitani Dr Atsuko Isogai |
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| Institution: | 1. Department of Chemistry, Graduate School of Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395 Japan;2. Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-osawa, Hachioji, Tokyo, 192-0397 Japan;3. Department of Chemistry, Osaka University, Toyonaka, Osaka, 560-0043 Japan;4. Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1 Kouto, Sayo, Hyogo, 679-5198 Japan;5. National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8565 Japan;6. National Research Institute of Brewing (NRIB), Higashihiroshima, Hiroshima, 739-0046 Japan |
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| Abstract: | Heterogeneous noble metal catalysts exhibit various functions. Although their redox functions have been extensively studied, we focused on their soft Lewis acid functions. Supported Au, Pt, and Pd catalysts electrophilically attack the π-electrons of soft bases such as alkynes, alkenes, and aromatic compounds to perform addition and substitution reactions. Hydroamination, intramolecular cyclization of alkynyl carboxylic acids, isomerization of allylic esters, vinyl exchange reactions, Wacker oxidation, and oxidative homocoupling of aromatics are introduced based on a discussion of the active species and reaction mechanisms. Furthermore, the adsorption of sulfur compounds, which are soft bases, onto the supported AuNPs is discussed. The adsorption and removal of 1,3-dimethyltrisulfane (DMTS), which is the compound responsible for the stale odor of “hine-ka” in alcoholic beverages, particularly Japanese sake, is described. |
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| Keywords: | noble metals supported catalysts adsorbents soft Lewis acids soft Lewis bases |
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