Molecular design of solid acid catalysts. Isomerization of n-butane catalyzed by acidic cesium salts of 12-tungstophosphoric acid combined with platinum
✍ Scribed by Kyutae Na; Takeshi Iizaki; Toshio Okuhara; Makoto Misono
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 254 KB
- Volume
- 115
- Category
- Article
- ISSN
- 1381-1169
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✦ Synopsis
Our recent efforts made for the molecular design of solid acid catalysts utilizing heteropoly compounds are described first and, then, as an example, the isomerization of n-butane in the presence of hydrogen catalyzed by a bifunctional catalyst consisting of Pt and Cs H PW O was examined mostly at 573 K. Presence of Pt suppressed substantially the catalyst 2.5 0.5 12 40 deactivation and gave much higher stationary activity, although the initial activity was lowered a little due to a decrease in the concentration of butenes produced. It was further demonstrated that the activity of Pt for hydrogenolysis was nearly completely suppressed by the protonic acid sites present near Pt, giving a very high selectivity for isomerization.