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

Abstract

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 low-temperature CO oxidation were investigated. The prepared catalysts were characterized using XRD, SEM, N2 adsorption/desorption isotherms, XPS, and H2-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 °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.