Studies on CrO x /La2O3/ZrO2 catalysts modified by Mg

Autor:	Dang Lanh Hoang, Soliman Farage, Andrea Dittmar, Andreas Martin, H. Lieske, Annette Trunschke
Rok vydání:	2006
Předmět:	inorganic chemicals Chemistry Magnesium Inorganic chemistry technology industry and agriculture Oxide chemistry.chemical_element General Chemistry Coke Heterogeneous catalysis Catalysis Chromium chemistry.chemical_compound Desorption Mixed oxide
Zdroj:	Catalysis Letters. 112:173-180
ISSN:	1572-879X 1011-372X
Popis:	Lanthana–zirconia supported chromium oxide and magnesium chromium mixed oxide catalysts were studied in the dehydrocyclization of n-octane and characterized by temperature-programmed desorption of NH3, temperature-programmed reduction, XPS and DRIFTS. The Mg-free catalyst shows the highest activity, but suffers from rapid deactivation due to coke formation. The addition of Mg decreases the initial activity of the supported chromium oxide and retards its deactivation. The characterization results reveal that the deactivation retarding effect of Mg species not only consists in the deletion of strong acid sites but also in the decoration and/or dilution of Cr3+ oxide cluster, supposedly due to the formation of Mg–Cr surface compounds and, thus, in preventing the formation of coke.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::4090bd3de47de1784a25abe14d1c564d https://doi.org/10.1007/s10562-006-0199-3 Zobrazit plný text záznamu Plný text ve formátu PDF