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- W2064201514 abstract "The present work investigates the reactivity of the surface species observable by in situ DRIFTS formed over a Pt/ZrO2 during the water–gas shift (WGS) reaction. A DRIFTS cell/mass spectrometer system was operated at the chemical steady state during isotopic transients to yield information about the true nature (i.e., main reaction intermediate or spectators) of adsorbates. Only carbonyl and formate species were observed by DRIFTS under reaction conditions; the surface coverage of carbonate species was negligible. Isotopic transient kinetic analyses revealed that formates exchanged uniformly according to a first-order law, suggesting that most formates observed by DRIFTS were of the same reactivity. In addition, the time scale of the exchange of the reaction product CO2 was significantly shorter than that of the surface formates. Therefore, a formate route based on the formates as detected by DRIFTS can be ruled out as the main reaction pathway in the present case. The number of precursors of the reaction product CO2 was smaller than the number of surface Pt atoms, suggesting that carbonyl species or some “infrared-invisible” complex (not excluding formates) at the Pt–zirconia interface was the main reaction intermediate. A simple redox mechanism could also explain the present results." @default.
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- W2064201514 date "2006-12-01" @default.
- W2064201514 modified "2023-10-15" @default.
- W2064201514 title "An investigation of possible mechanisms for the water–gas shift reaction over a ZrO2-supported Pt catalyst" @default.
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- W2064201514 doi "https://doi.org/10.1016/j.jcat.2006.09.004" @default.
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