Infrared studies of CO oxidation by oxygen and by water over Pt/Al2O3 and Pd/Al2O3 catalysts
[Display omitted] ► Pd/Al2O3 and Pt/Al2O3 catalysts have been studied by IR spectroscopy of CO adsorption. ► CO oxidation and water gas shift experiments have been performed. ► Dispersed Ptn+ and Pdn+ cations and PdOx species are revealed. ► After reduction by hydrogen, they are reformed by O2 and a...
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Published in: | Applied catalysis. B, Environmental Vol. 113-114; pp. 172 - 179 |
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Elsevier B.V
22-02-2012
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Abstract | [Display omitted]
► Pd/Al2O3 and Pt/Al2O3 catalysts have been studied by IR spectroscopy of CO adsorption. ► CO oxidation and water gas shift experiments have been performed. ► Dispersed Ptn+ and Pdn+ cations and PdOx species are revealed. ► After reduction by hydrogen, they are reformed by O2 and also by water at moderate temperature. ► They are not detectable in reaction conditions but can be active sites for CO oxidation and LTWGS.
CO adsorption has been studied over Pd/Al2O3 and Pt/Al2O3 catalysts using IR spectroscopy in different conditions and after different pretreatments. The oxidation of CO by oxygen and water (water gas shift) has also been studied at 130–673K. The spectra show that the most active species as oxidant for CO are dispersed Ptn+ and Pdn+ cations and PdOx species mainly “decorating” the defects of alumina crystals where they modify completely the behaviour of surface OH's and Lewis acid sites. Some of these species oxidize CO to CO2 already below ∼200K. These highly oxidized species escape detection by IR during reaction at 500–673K, when only reduced sites are apparent due to their very strong interaction with CO. The data suggest that redox mechanisms could occur for both WGS and CO oxidation occurring on highly dispersed cationic species non detectable under reaction conditions. |
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AbstractList | [Display omitted]
► Pd/Al2O3 and Pt/Al2O3 catalysts have been studied by IR spectroscopy of CO adsorption. ► CO oxidation and water gas shift experiments have been performed. ► Dispersed Ptn+ and Pdn+ cations and PdOx species are revealed. ► After reduction by hydrogen, they are reformed by O2 and also by water at moderate temperature. ► They are not detectable in reaction conditions but can be active sites for CO oxidation and LTWGS.
CO adsorption has been studied over Pd/Al2O3 and Pt/Al2O3 catalysts using IR spectroscopy in different conditions and after different pretreatments. The oxidation of CO by oxygen and water (water gas shift) has also been studied at 130–673K. The spectra show that the most active species as oxidant for CO are dispersed Ptn+ and Pdn+ cations and PdOx species mainly “decorating” the defects of alumina crystals where they modify completely the behaviour of surface OH's and Lewis acid sites. Some of these species oxidize CO to CO2 already below ∼200K. These highly oxidized species escape detection by IR during reaction at 500–673K, when only reduced sites are apparent due to their very strong interaction with CO. The data suggest that redox mechanisms could occur for both WGS and CO oxidation occurring on highly dispersed cationic species non detectable under reaction conditions. CO adsorption has been studied over Pd/Al2O3 and Pt/Al2O3 catalysts using IR spectroscopy in different conditions and after different pretreatments. The oxidation of CO by oxygen and water (water gas shift) has also been studied at 130-673 K. The spectra show that the most active species as oxidant for CO are dispersed Ptn+ and Pdn+ cations and PdOx species mainly "decorating" the defects of alumina crystals where they modify completely the behaviour of surface OH's and Lewis acid sites. Some of these species oxidize CO to CO2 already below similar to 200 K. These highly oxidized species escape detection by IR during reaction at 500-673 K, when only reduced sites are apparent due to their very strong interaction with CO. The data suggest that redox mechanisms could occur for both WGS and CO oxidation occurring on highly dispersed cationic species non detectable under reaction conditions. |
Author | Busca, Guido Escribano, Vicente Sanchez Finocchio, Elisabetta |
Author_xml | – sequence: 1 givenname: Guido surname: Busca fullname: Busca, Guido email: Guido.Busca@unige.it organization: Dipartimento di Ingegneria Chimica e di Processo, Università di Genova, P.le J.F. Kennedy 1, I-16129, Genova, Italy – sequence: 2 givenname: Elisabetta surname: Finocchio fullname: Finocchio, Elisabetta organization: Dipartimento di Ingegneria Chimica e di Processo, Università di Genova, P.le J.F. Kennedy 1, I-16129, Genova, Italy – sequence: 3 givenname: Vicente Sanchez surname: Escribano fullname: Escribano, Vicente Sanchez organization: Dpto. de Química Inorgánica, Facultad de Ciencias Químicas, Universidad de Salamanca, Pl. de la Merced s/n, 37008 Salamanca, Spain |
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Keywords | Platinum on alumina CO oxidation Palladium on alumina IR spectroscopy Noble metal catalysts Water gas shift |
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► Pd/Al2O3 and Pt/Al2O3 catalysts have been studied by IR spectroscopy of CO adsorption. ► CO oxidation and water gas shift experiments have... CO adsorption has been studied over Pd/Al2O3 and Pt/Al2O3 catalysts using IR spectroscopy in different conditions and after different pretreatments. The... |
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SubjectTerms | CO oxidation IR spectroscopy Noble metal catalysts Palladium on alumina Platinum on alumina Water gas shift |
Title | Infrared studies of CO oxidation by oxygen and by water over Pt/Al2O3 and Pd/Al2O3 catalysts |
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