Abstract
Rh/ceria catalysts were synthesized by flame spray pyrolysis for high temperature water gas shift (WGS) reactions. These catalysts show a high specific surface area due to a high degree of nanocrystallinity. X-ray absorption spectroscopy (XAS) unraveled the formation of small Rh particles under WGS reaction conditions. The catalytic activity was examined at atmospheric pressure by measuring CO conversion as a function of temperature. Some methane formation was observed above 310°C.
Highlights
Hydrogen is a feedstock used for diverse industrial applications, and a clean fuel for fuel cells and a key element for chemical storage of renewable energy
4.3 wt.% Rh/CeO2 catalysts were prepared by flame spray pyrolysis (FSP) [5], using solutions of the corresponding initial precursor in xylene (VWR chemicals)
The results show that the 4.3 wt.% Rh/CeO2 catalyst is reduced at ca. 114 °C
Summary
Hydrogen is a feedstock used for diverse industrial applications, and a clean fuel for fuel cells and a key element for chemical storage of renewable energy. 4.3 wt.% Rh/CeO2 catalysts were prepared by flame spray pyrolysis (FSP) [5], using solutions of the corresponding initial precursor in xylene (VWR chemicals). First the catalysts were characterized by in situ temperature programmed reduction (TPR) during heating from room temperature to 450 °C at 5 °C/min in 5% H2/He (flow 50 mL/min) while recording XANES spectra in Quick-EXAFS mode (recorded at SNBL/ESRF).
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