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Technical University of Crete
Technical University of Crete
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| URI: | http://purl.tuc.gr/dl/dias/10CEEC83-261C-46A2-A99F-55F4E319DA80 | ||
| Year | 2008 | ||
| Type of Item | Conference Full Paper | ||
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| Bibliographic Citation | 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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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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