Bulk oxygen promoted water–gas shift reaction activity over Pt/Ce0.6Zr0.4O2 catalyst

• Pt/Ce0.6Zr0.4O2 exhibits faster WGS reaction kinetics.
• Pt/Ce0.6Zr0.4O2 catalyst exhibit less carbonaceous deposition during WGS reaction.
• Surface oxygen vacancies of Pt/Ce0.6Zr0.4O2 diffuse into the bulk.
• The oxygen storage capacity was higher for Pt/Ce0.6Zr0.4O2 catalyst.

The water–gas shift (WGS) reaction of Pt/Ce0.6Zr0.4O2 catalyst was studied, as well as the reference catalysts Pt/CeO2 and Pt/ZrO2. In situ electronic conductivity measurements under reactive atmosphere show that surface oxygen vacancies of Pt/Ce0.6Zr0.4O2 diffuse into the bulk materials at the temperature typical for the operation of WGS reaction, i.e., bellow 623 K. Compared with Pt/CeO2, it was found that the oxygen storage capacity (OSC) was higher for Pt/Ce0.6Zr0.4O2 catalyst. Pt/Ce0.6Zr0.4O2 shows a markedly higher CO conversion rate than Pt/CeO2 and Pt/ZrO2 catalysts, which was interpreted by more active oxygen species available and higher coke resistance.

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