Performance of supported Co₃O₄ catalysts in the preferential oxidation of carbon monoxide: effect of support type and synthesis method

Abstract

This study investigated the performance of supported Co₃O₄ catalysts during the preferential oxidation of carbon monoxide (CO-PrOx) in a H₂-rich environment, focusing on the effects of different catalyst synthesis methods, namely, wetness impregnation (WI) and solution combustion synthesis (SCS), and different support materials, namely, Al₂O₃ and SiC. During CO-PrOx, the SiC-supported Co₃O₄ catalysts attained higher CO₂ yields when compared with the Al₂O₃-supported Co₃O₄ catalysts possibly because of the existence of weaker interactions between Co₃O₄ and SiC. Moreover, the catalysts prepared via SCS achieved higher CO₂ yields than the catalysts prepared via WI likely due to the presence of smaller and well-dispersed Co₃O₄ particles in the SCS-prepared catalysts. Significantly high amounts of unwanted CH₄ were produced over the SiC-supported catalysts between 225 and 250 °C. The high CO methanation activity was also attributed to the weaker Co₃O₄-SiC interactions, which enabled the easier reduction of Co₃O₄ to methanation active metallic Co.

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