Catalytic Chemistry of Supported Heteropolyacids and Their Applications as Solid Acids to Industrial Processes |
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Authors: | Yuichi Kamiya Toshio Okuhara Makoto Misono Atsuyuki Miyaji Katsuyuki Tsuji Tetsuo Nakajo |
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Institution: | (1) Research Faculty of Environmental Earth Science, Hokkaido University, Sapporo 060-0810, Japan;(2) National Institute of Technology and Evaluation, Tokyo 151-0066, Japan;(3) Showa Denko K.K, Oita Complex, Oita 870-0189, Japan;(4) Corporate Technical Office, Showa Denko K.K, Tokyo 105-8518, Japan |
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Abstract: | This article reviews recent research and development of supported heteropolyacid (HPA) catalysts; focusing on the acidic and
catalytic properties. First the basic knowledge of solid HPAs is provided briefly to facilitate understanding of heterogeneous
catalysis of HPAs. Secondly, the structure as well as the physical and chemical properties of supported HPA catalysts is described.
Especially the layer structure of HPA dispersed on the surface of SiO2 and the changes in the surface acidity with the loading level of HPA are discussed. For this purpose, temperature programmed
desorption of benzonitrile devised by Okuhara and Kamiya’s group is useful. This method is capable to assess the surface acidity
of the supported HPA, which controls the catalytic activity for the reactions proceeding by surface-type catalysis. Then,
two new industrial processes developed by Showa Denko K. K. are described; (i) production of ethyl acetate from ethylene and
acetic acid and (ii) oxidation of ethylene to acetic acid. Supported HPA catalysts are utilized for both processes, which
were recently much improved by finely controlling the catalysts and reaction conditions. |
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Keywords: | Heteropolyacid Supported heteropolyacid catalyst Solid acid Industrial process Layer structure Wacker-type reaction Green chemical process |
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