The different method and condition were used to prepare Au/Co₃O₄ catalysts and Co₃O₄ support.The aqueous precipitation and deposition-precipitation method were used to prepare Au/Co₃O₄ catalysts. The effect of preparation method and the condition of support on the catalyst activity of CO was investigated. The BET, XRD, TPR and XPS were carried out to analyze the influence factor on the catalysts activity. The results show that the catalytic activity is effected by preparation method distinctly, the catalyst prepared by deposition-precipitation method has higher activity than the other catalysts. Furthermore, the preparation conditions of support also affected the catalyst activity and the addition of dispersant and use of microwave in the support preparation process can improve the catalytic activity. The result of XPS indicates that Au δ+ species is catalytic activity component, the increasing of OH^- content can promote catalytic activity. The result of TPR indicates that addition of gold can accelerate the reduction of support and improve catalytic activity.

Gold catalyst, Preparation method,  Co₃O₄, Catalytic oxidation of carbon monoxide