Correlation between Structural and Catalytic Properties of Copper Supported on Porous Alumina for the Ethanol Dehydrogenation Reaction

Autor:	Celso Valentim Santilli, Valérie Briois, Aline Ribeiro Passos, Amélie Rochet, Wellington H. Cassinelli, Sandra Helena Pulcinelli, Leandro Martins
Rok vydání:	2015
Předmět:	X-ray absorption spectroscopy Chemistry Organic Chemistry Inorganic chemistry chemistry.chemical_element Activation energy Atmospheric temperature range Copper Catalysis Inorganic Chemistry Adsorption Dehydrogenation Physical and Theoretical Chemistry Incipient wetness impregnation
Zdroj:	ChemCatChem. 7:1668-1677
ISSN:	1867-3880
Popis:	Structural and surface features of highly dispersed copper catalysts supported on hierarchical porous alumina were evaluated for the ethanol dehydrogenation reaction. The catalysts were prepared by incipient wetness impregnation of alumina obtained by a dual template sol–gel procedure. Structural characterizations provided evidence that the copper was highly dispersed on the alumina in the form of monomeric octahedral Cu2+ species adsorbed into an incomplete layer. A two-step reduction was observed for the catalysts in a temperature range of 50–250 °C under H2/He flow. The temperature for onset of reduction and the percentage of Cu+ species formed upon activation were dependent on the Cu loading. At lower Cu loadings, the amount of Cu+ increased, leading to a slower and less complete reduction. Based on the apparent activation energy and turnover frequency, it could be concluded that Cu+ containing a mixture of Cu+/Cu0 results in a more efficient catalyst than Cu0 for the ethanol dehydrogenation reaction.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::aa81809a0c20de2b03e43a3ccada2839 https://doi.org/10.1002/cctc.201500112 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
Nepřihlášeným uživatelům se plný text nezobrazuje	K zobrazení výsledku je třeba se přihlásit.