REVIEW ON CO OXIDATION BY NOBLE AND NON-NOBLE METAL BASED CATALYST

The abatement of CO by heterogeneous catalysts such as noble and non-noble metal is one of the challenging and interesting routes in environmental catalysis. In this review, the CO oxidation mechanism of noble metal and non-metal based catalyst systems is examined. Oxidation of CO to CO2 by using noble metals (Pt, Pd, Rh, and Au) and non-noble metals (Cu, Co,Mn) has been reviewed carefully regarding their role in support. The CO oxidation by noble metals has shown very high activity. However, a large number of studies have also been devoted to the CO oxidation by non-noble metals, metal oxides, modified binary metal oxides, and the like. Non-noble metals showed CO oxidation activity at lower temperature and were comparable with noble metals. The mechanistic aspects and the role of surface and gaseous oxygen in CO oxidation using transition metals/mixture of metal oxides and Pt, Pd, Rh, and Au have been studied thoroughly.