Powder and structured Pt/Ce0.75Zr0.25O2-based catalysts: Water gas shift performance and quasi in situ XPS studies

The data on the performance in water gas shift reaction of a powder 5 wt% Pt/Ce0.75Zr0.25O2 and a structured 0.33 wt% Pt/Ce0.75Zr0.25O2/q-Al2O3/FeCrAl catalysts are reported in this work. For the powder one the lowest outlet CO concentrations were shown to be 0.5, 0.9 and 1.5 vol% corresponding to the initial ones of 5, 10 and 15 vol%, respectively; the temperature required to reach these values did not exceed 310 degrees C. The quasi in situ XPS data have shown that doping CeO2 with Zr enhances the reducibility of the oxide allowing Ce3+ formation without any treatment. Additionally, it was found that there are 20-30% of nonmetallic Pt atoms on the surface even after a treatment in CO at 300 degrees C. For the structured catalyst the downward temperature gradient along the monolith was observed with a dispersion of 50-60 degrees C. The lowest CO concentrations were observed at the temperatures at the catalyst's back point of 280 degrees C-3.9 and 4.3 vol% CO in the dry gas for 15,700 and 31,400 cm3 center dot gcat -1 center dot h-1, respectively, for 10 vol% CO in the feed gas. (c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.