H2 production from a single stage water–gas shift reaction over Pt/CeO2, Pt/ZrO2, and Pt/Ce(1−x)Zr(x)O2 catalysts

To develop a single stage water–gas shift reaction (WGS) catalyst for compact reformers, Pt/CeO2, Pt/ZrO2, and Pt/Ce(1−x)Zr(x)O2 catalysts have been applied for the target reaction. The CeO2/ZrO2 ratio was systematically varied to optimize Pt/Ce(1−x)Zr(x)O2 catalysts. Pt/CeO2 showed the highest turnover frequency (TOF) and the lowest activation energy (Ea) among the catalysts tested in this study. It has been found that the reduction property of the catalyst is more important than the dispersion for a single stage WGS. Pt/CeO2 catalyst also showed stable catalytic performance. Thus, Pt/CeO2 can be a promising catalyst for a single stage WGS for compact reformers.

► Pt/CeO2, Pt/ZrO2, and Pt/Ce(1−x)Zr(x)O2 have been applied to a single stage WGS.
► Pt/CeO2 exhibited the highest CO conversion as well as 100% CO2 selectivity.
► This is due to easier reducibility, lower activation energy and high OSC of CeO2.
► Pt/CeO2 also showed relatively stable activity with time on stream.
► Thus, Pt/CeO2 can be a promising catalyst for a single stage WGS.