Catalytic co-oxidation of CO and H2 over FeOx-supported Pd catalyst at low temperatures

Co-oxidation of CO and H2 or oxidation of H2 in the presence of CO was first achieved at low temperatures (0–20 °C) over single-component catalysts (Pd/FeOx  ) at a space velocity of 15,000mlgcat-1h-1. A systematical study of FeOx- and Al2O3-supported Pd catalysts is carried out by means of STEM, TEM, XRD, XPS, Mössbauer spectra, and time-resolved CO titration. Highly dispersed Pd nanoparticles with size 1–1.8 nm over 5.4 wt% Pd/FeOx are confirmed by HAADF-STEM and HRTEM. Time-resolved CO titration, Mössbauer spectra, and XRD and XPS results suggest FeOx support supplying active oxygen is involved in the oxidations. Particle size effect and oxygen supply from FeOx support are speculated to be the main reasons for the excellent performance of Pd/FeOx in co-oxidation of CO and H2 or oxidation of H2 in the presence of CO.

Graphical abstractCo-oxidation of CO and H2 or oxidation of H2 in the presence of CO was achieved at low temperatures (0–20 °C) over single-component catalysts (Pd/FeOx  ) at a space velocity of 15,000mlgcat-1h-1. Based on a systematical characterization study, it is speculated that highly dispersed Pd nano particles and FeOx support supplying active oxygen which is involved in oxidations are the key factors for excellent performance of Pd/FeOx for co-oxidation of CO and H2 at low temperatures.Figure optionsDownload full-size imageDownload high-quality image (159 K)Download as PowerPoint slideHighlights► Co-oxidation of CO and H2 or oxidation of H2 in the presence of CO was achieved at low temperatures (0–20 °C). ► Particle size effect is evident. ► Highly dispersed Pd nano particles over Pd/FeOx are indispensable but not enough for high co-oxidation activity. ► FeOx support supplying active oxygen is involved in oxidations. ► Time-resolved CO titration.