Abstract

Co3O4 catalysts were prepared by combustion synthesis using different fuels glycine (G), ODH (O) and urea (U). Morphological changes of the materials were observed by using different fuels. The prepared catalysts were characterized by XRD, XPS, SEM, TEM, BET and DRIFTS analysis. All compounds showed 100% conversion of CO below 175°C. The prepared catalysts exhibited very high stability and conversions did not decrease even after 50h of continuous operation. The oxygen storage capacity (OSC) of materials was measured by H2–TPR analysis. Co3O4–O is having high OSC among the synthesized catalysts. The activation energies of these catalysts were found to be in the range of 42.3–64.8kJmol−1. With DRIFTS analysis, the surface carbonates, superoxide anions, adsorbed CO, O2 species on the catalyst surface were found and this information was used to develop a detailed reaction pathway. A kinetic model was developed with the help of proposed mechanism and used to fit the data.

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