Reaction Characteristics of Precious-Metal-Free Ternary Mn-Cu-M (M = Ce, Co, Cr, and Fe) Oxide Catalysts for Low-Temperature CO Oxidation

In this paper, we prepared binary Mn-Cu and M (M = Ce, Co, Cr, and Fe)-added ternary Mn-Cu-M oxide catalysts using the redox precipitation method, and their catalytic performances in law-temperature CO oxidation were investigated. The prepared catalysts were characterized using XRD, SEM, N-2 adsorption/desorption isotherms, XPS, and H-2-TPR techniques. It was observed that the CO oxidation performance at low temperature improved significantly when Cu and other dopants were added. The optimum molar ratio of Mn to Cu in a binary oxide catalyst was 1.0/0.1. The Mn Cu Co oxide catalyst had the highest activity, which was converted 90% of the CO at the relatively low temperature of 75 degrees C, among the prepared catalysts. It was concluded that the improvement of oxygen mobility and textural properties for Mn Cu Co catalyst are more favorably influenced on the enhanced catalytic activity.