| Autor: |
K.B. Fogash, James A. Dumesic, Z. Hong, Jeffrey M. Kobe |
| Rok vydání: |
1998 |
| Předmět: |
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| Zdroj: |
Applied Catalysis A: General. 172:107-116 |
| ISSN: |
0926-860X |
| DOI: |
10.1016/s0926-860x(98)00112-4 |
| Popis: |
The catalytic properties of sulfated-zirconia and H-mordenite for isomerization of n -butane and isobutane were studied at temperatures near 450 K. Both catalysts showed rapid deactivation (deactivation constant k deact near 0.02 min −1 ) during isomerization of n -butane when olefins were present in the feed stream. Removal of olefins from the feed decreased the rate of catalyst deactivation over sulfated-zirconia ( k deact near 0.007 min −1 ), while removal of feed olefins eliminated the isomerization reaction over H-mordenite. Deactivation of the catalysts during n -butane isomerization appears to be caused by the production of coke on the catalyst from straight-chain olefinic species either present in the feed or produced on the catalyst (for the case of sulfated-zirconia) under reaction conditions. The rates of deactivation are slower during isobutane isomerization than during n -butane isomerization over sulfated-zirconia and H-mordenite catalysts in the presence of feed olefins ( k deact near 0.006 min −1 ). Higher rates of production of C 6 -species are observed during isobutane isomerization than during n -butane isomerization. It appears that more effective hydride transfer during isobutane isomerization than during n -butane isomerization may remove coke precursors. Isobutane isomerization may be an effective probe reaction to study solid acid catalysts at pseudo-steady state reaction conditions. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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