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Sulfated zirconia; deactivation; UV-vis-NIR spectroscopy; isomerization
Acid-base & redox properties of promoted sulfated zirconia
Abstract:
The deactivation phenomena during n-butane isomerization on sulfated zirconia (SZ) at 373 K are investigated by in situ UV-vis-NIR diffuse reflectance spectroscopy and on-line gas chromatography.
Water formed initially blocks the access of the reactant to the active sites and leads thus to the fast short term deactivation.
Adding propene to the feed leads to the formation of polyunsaturated species. These species are good candidates to explain the slow long term deactivation of SZ. Monoenic allylic species detected on the catalyst during reaction, are only spectators, and not responsible for the deactivation, as previously reported in the literature.
