On highly active partially oxidized platinum in carbon monoxide oxidation over supported platinum catalysts

In situ X-ray absorption spectroscopy identified the role of oxidized platinum species in generating a high-activity state in the oxidation of carbon monoxide over Pt/Al 2O 3, Pt/TiO 2 and Pt/SiO 2. Two activity regimes were identified: low-activity at high carbon monoxide concentration and low temp...

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Published inJournal of catalysis Vol. 263; no. 2; pp. 228 - 238
Main Authors Alayon, E.M.C., Singh, J., Nachtegaal, M., Harfouche, M., van Bokhoven, J.A.
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier Inc 25.04.2009
Elsevier
Elsevier BV
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Abstract In situ X-ray absorption spectroscopy identified the role of oxidized platinum species in generating a high-activity state in the oxidation of carbon monoxide over Pt/Al 2O 3, Pt/TiO 2 and Pt/SiO 2. Two activity regimes were identified: low-activity at high carbon monoxide concentration and low temperature, and high activity at low carbon monoxide concentration and high temperature. The change between the two regimes occurred suddenly; there was ignition when going from low to high activity, and extinction from high to low activity. Ignition only occurred when the concentration of oxygen was higher than that of carbon monoxide. The catalyst was metallic and covered with carbon monoxide at low activity and partially oxidic at high activity. Carbon monoxide poisoned the catalyst at low activity. The partially oxidized platinum catalysts showed high activity. The partially oxidized catalyst had a lower oxygen coordination number and shorter Pt–O bond length as expected for bulk PtO 2, suggesting that a strongly defected platinum oxide was formed with a possibly square planar coordination. The catalyst structure showed a dynamic behavior and the amount of oxide depended on the concentration of reactants in the gas phase. Smaller particles of Pt/Al 2O 3 reached high activity at lower temperature than the larger particles. Pt/TiO 2 reached high activity at the lowest temperature while Pt/SiO 2 required the highest temperature. Parallel with the temperature of ignition, Pt/SiO 2 was the most oxidized while Pt/TiO 2 was the least oxidized. In situ XAS identified surface-oxidized platinum as the active species at high activity during carbon monoxide oxidation over supported platinum catalysts. At low activity, the platinum catalysts were metallic and poisoned by carbon monoxide.
AbstractList In situ X-ray absorption spectroscopy identified the role of oxidized platinum species in generating a high-activity state in the oxidation of carbon monoxide over Pt/Al 2O 3, Pt/TiO 2 and Pt/SiO 2. Two activity regimes were identified: low-activity at high carbon monoxide concentration and low temperature, and high activity at low carbon monoxide concentration and high temperature. The change between the two regimes occurred suddenly; there was ignition when going from low to high activity, and extinction from high to low activity. Ignition only occurred when the concentration of oxygen was higher than that of carbon monoxide. The catalyst was metallic and covered with carbon monoxide at low activity and partially oxidic at high activity. Carbon monoxide poisoned the catalyst at low activity. The partially oxidized platinum catalysts showed high activity. The partially oxidized catalyst had a lower oxygen coordination number and shorter Pt–O bond length as expected for bulk PtO 2, suggesting that a strongly defected platinum oxide was formed with a possibly square planar coordination. The catalyst structure showed a dynamic behavior and the amount of oxide depended on the concentration of reactants in the gas phase. Smaller particles of Pt/Al 2O 3 reached high activity at lower temperature than the larger particles. Pt/TiO 2 reached high activity at the lowest temperature while Pt/SiO 2 required the highest temperature. Parallel with the temperature of ignition, Pt/SiO 2 was the most oxidized while Pt/TiO 2 was the least oxidized. In situ XAS identified surface-oxidized platinum as the active species at high activity during carbon monoxide oxidation over supported platinum catalysts. At low activity, the platinum catalysts were metallic and poisoned by carbon monoxide.
In situ X-ray absorption spectroscopy identified the role of oxidized platinum species in generating a high-activity state in the oxidation of carbon monoxide over Pt/Al2O3, Pt/TiO2 and Pt/SiO2. Two activity regimes were identified: low-activity at high carbon monoxide concentration and low temperature, and high activity at low carbon monoxide concentration and high temperature. The change between the two regimes occurred suddenly; there was ignition when going from low to high activity, and extinction from high to low activity. Ignition only occurred when the concentration of oxygen was higher than that of carbon monoxide. The catalyst was metallic and covered with carbon monoxide at low activity and partially oxidic at high activity. Carbon monoxide poisoned the catalyst at low activity. The partially oxidized platinum catalysts showed high activity. The partially oxidized catalyst had a lower oxygen coordination number and shorter Pt-O bond length as expected for bulk PtO2, suggesting that a strongly defected platinum oxide was formed with a possibly square planar coordination. The catalyst structure showed a dynamic behavior and the amount of oxide depended on the concentration of reactants in the gas phase. Smaller particles of Pt/Al2O3 reached high activity at lower temperature than the larger particles. Pt/TiO2 reached high activity at the lowest temperature while Pt/SiO2 required the highest temperature. Parallel with the temperature of ignition, Pt/SiO2 was the most oxidized while Pt/TiO2 was the least oxidized. [PUBLICATION ABSTRACT]
Author van Bokhoven, J.A.
Singh, J.
Harfouche, M.
Nachtegaal, M.
Alayon, E.M.C.
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Copyright 2009 Elsevier Inc.
2009 INIST-CNRS
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Issue 2
Keywords Carbon monoxide oxidation
Active phase
Supported platinum catalysts
In situ XAS
Binary compound
Bond length
In situ
Ignition
High temperature
Silica
Supported catalyst
Particle
Dynamics
Platinum
Defect
Oxidation
Carbon monoxide
Structure
Low temperature
Platinum oxide
Oxygen
Extinction
Transition element compounds
Transition metal
Heterogeneous catalysis
Silicon oxides
Gas phase
Titanium oxide
Catalyst activity
Alumina
X ray absorption
Language English
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Snippet In situ X-ray absorption spectroscopy identified the role of oxidized platinum species in generating a high-activity state in the oxidation of carbon monoxide...
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StartPage 228
SubjectTerms Active phase
Analytical chemistry
Carbon monoxide
Carbon monoxide oxidation
Catalysis
Catalysts
Chemistry
Exact sciences and technology
General and physical chemistry
In situ XAS
Oxidation
Platinum
Supported platinum catalysts
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Title On highly active partially oxidized platinum in carbon monoxide oxidation over supported platinum catalysts
URI https://dx.doi.org/10.1016/j.jcat.2009.02.010
https://www.proquest.com/docview/195448542
Volume 263
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