Synthesis of CuMnOx catalysts by novel routes for selective catalytic oxidation of carbon monoxide

Abstract

The ambient temperature catalytic oxidation of carbon monoxide (CO) is very important process for all living beings present in the atmosphere. Hopcalite (CuMnOx) is a mixed oxide of copper and manganese has been efficiently applied as a catalyst in the catalytic converter for CO oxidation. All the catalysts are prepared by the Co-precipitation method and characterized by the SEM-EDX, XRD, FTIR, BET and XPS technique. The ratio of Cu:Mn in CuMnOx catalyst was divided into three equal parts (Cu:Mn = 1:2, Cu:Mn = 1:1 and Cu:Mn = 2:1) and their performances for CO oxidation was also measured. The activity order of catalysts for CO oxidation was as follows: Cu2Mn1 < Cu1Mn1 < Cu1Mn2. In these catalysts the Cu1Mn2 has showed that the best catalytic activity for CO oxidation at a lower temperature. The calcinations strategies of precursors have great influences on the activity of resultant catalyst. All the catalysts are prepared in different calcinations conditions like reactive calcinations (RC) and traditional calcinations. The reactive calcinations strategy is one of the best calcinations strategies for the preparation of highly active catalysts. The stability of CuMnOx catalyst is also investigated in this research work.