Effects of Reaction Temperature and Support Composition on the Mechanism of Water–Gas Shift Reaction over Supported-Pt Catalysts

The present work reports on a detailed study of the effect of support chemical composition and reaction temperature on the mechanism of the water–gas shift (WGS) reaction over supported-Pt catalysts. The effect of the same parameters on the chemical composition and surface concentration of active reaction intermediates was also determined for the first time, information that allowed elucidating also the site location of these intermediates, e.g., support versus metal or support–metal interface. The above-mentioned mechanistic information was rigorously provided by the application of steady-state isotopic transient kinetic analysis (SSTIKA) experiments coupled with mass spectrometry (MS) and DRIFTS techniques, and by other transient isotopic experiments designed. It was found that on Pt/CeO2 a switch of the WGS reaction mechanism from “redox” to a combination of redox and “associative formate with −OH group regeneration” is obtained after increasing the reaction temperature from 473 to 573 K. On the other ...

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