Cobalt migration inside a mordenite framework upon CO chemisorption and CO oxidation

Autor:	Juan O. Petunchi, Eduardo Ernesto Miró
Rok vydání:	1992
Předmět:	Reaction rate Adsorption Chemisorption Chemistry Inorganic chemistry Enthalpy chemistry.chemical_element Activation energy Physical and Theoretical Chemistry Cobalt Mordenite Catalysis
Zdroj:	J. Chem. Soc., Faraday Trans.. 88:1219-1223
ISSN:	1364-5455 0956-5000
DOI:	10.1039/ft9928801219
Popis:	A Co mordenite (CoM) has been investigated to determine its suitability as a catalyst for the oxidation of CO. It proved to be an active catalyst for this reaction. After treatment at 773 K in CO followed by O2 at the same temperature, the reaction rate increased by three orders of magnitude. This treatment also enhanced the CO adsorption capacity of the solid. Two different rate laws were found. The fresh sample was fractional order in O2 and CO, 0.5 and 0.75, respectively, with an activation energy of 87.9 kJ mol–1. After treatment, the rate was zero order in CO and first order in O2 and the activation energy was 48.9 kJ mol–1. The enthalpy of adsorption was also different for fresh and treated CoM, 39.7 and 48.1 kJ mol–1, respectively. The results obtained are analysed in terms of the mobility of the cations from hidden to accessible sites in the mordenite framework, where different active sites may be generated.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::1a69ee833012fbb0e1463ef3797a984a https://doi.org/10.1039/ft9928801219 Zobrazit plný text záznamu