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In situ DRIFTS study ofsurface species formed over sodium promoted Pt/Al2O3 catalysts during thereduction of NO by C3H6”

Matsouka Vasiliki, Koukiou S., Konsolakis Michail, Yentekakis Ioannis.V.

Πλήρης Εγγραφή


URI: http://purl.tuc.gr/dl/dias/10CEEC83-261C-46A2-A99F-55F4E319DA80
Έτος 2008
Τύπος Πλήρης Δημοσίευση σε Συνέδριο
Άδεια Χρήσης
Λεπτομέρειες
Βιβλιογραφική Αναφορά V. Matsouka, S. Koukiou, M. Konsolakis, I.V. Yentekakis, “In situ DRIFTS study of surface species formed over sodium promoted Pt/Al2O3 catalysts during the reduction of NO by C3H6”, in Proc. Protection and Restoration of the Environment IX, 2008.
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Περίληψη

The nature and the relative population of adsorbed species formed on the surface of un-promotedand sodium promoted Pt catalysts supported on γ-Al2O3 was investigated by using in situ DRIFTSpectroscopy, during the NO reduction by propene. Under steady-state reaction conditions, thesurface of the un-promoted Pt/γ-Al2O3 catalyst is mainly covered by adsorbed hydrocarbonfragments, formates, acetates and cyanide species. In contrast, the surface of Na-promoted Pt(Na)/γ-Al2O3 catalysts is predominantly covered by NOx ad-species, carbonyls, cyanides and isocyanates,whereas no hydrocarbons fragments were detected under reaction conditions. The present resultsdemonstrate that the strongly enhanced catalytic performance of Na-modified Pt(Na)/Al2O3catalysts, can be attributed to the pronounced effect of alkalis on the hydrocarbon and NOchemisorption bonds, which in turn prevents self-poisoning of catalyst surface by strongly bondedhydrocarbon fragments and carboxylates.

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