Metal−Support Interactions in Zeolite-Supported Noble Metals: Influence of Metal Crystallites on the Support Acidity

Autor:	Hannu Karhu, Tapani Venäläinen, David Kubička, Iva Kubickova, Narendra Kumar, Heidi Österholm, Dmitry Yu. Murzin
Rok vydání:	2006
Předmět:	Inorganic chemistry chemistry.chemical_element Surfaces Coatings and Films Catalysis Metal chemistry.chemical_compound Adsorption chemistry Decalin Desorption visual_art Pyridine Materials Chemistry visual_art.visual_art_medium Physical and Theoretical Chemistry Platinum Zeolite
Zdroj:	The Journal of Physical Chemistry B. 110:4937-4946
ISSN:	1520-5207 1520-6106
DOI:	10.1021/jp055754k
Popis:	The metal-support interactions on a series of catalysts of different acidities, including platinum-modified zeolites and H-MCM-41, are investigated by means of XPS, CO and pyridine adsorption, and a model reaction (ring opening of decalin). The electronic properties of Pt are influenced by the acidity of the support, and the alteration of Pt properties increases with increasing acidity of the support, as can be seen from the changes in the Pt binding energy and stretching frequency of adsorbed CO. At the same time, the presence of platinum affects the acidic properties of the supports by reducing the strength of the acid sites. This is observed directly as the changes in desorption of pyridine from the acid sites and indirectly as the suppression of cracking reactions during the ring opening of decalin on the Pt-modified catalysts. The observed results are discussed in terms of the interatomic potential model.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7ee14e807fb2f35900d4175d18e3a57f https://doi.org/10.1021/jp055754k Zobrazit plný text záznamu