COMPARATIVE CATALYTIC STUDY OF PURE COBALT OXIDE SPINEL AND NON-NOBLE METAL DOPED COBALT OXIDE SPINEL FOR SELECTIVE OXIDATION OF ALCOHOL TO ALDEHYDE: A REVIEW

Abstract

The selective oxidation of alcohol by heterogeneous catalysts, such as noble and non-noble metal oxide spinels and doped metal oxide spinels, is one of the challenging and interesting routes in catalysis. In this review, the selective oxidation mechanism of non-noble cobalt oxide spinel and various metal-doped cobalt oxide spinel-based catalyst systems are examined. Selective oxidation of alcohol to aldehyde by using cobalt oxide spinel (Co<sub>3</sub>O<sub>4</sub>) and various metal-doped cobalt oxide spinels (Fe, Mn, Ni, Al, Cu, Sr) has been reviewed carefully. The selective oxidation by pure cobalt oxide spinel showed higher activity. However, a large number of studies have also been devoted to selective oxidation by various metal-doped cobalt oxide spinels. The metal-doped Co<sub>3</sub>O<sub>4</sub> showed higher selective oxidation activity compared to the pure spinel Co<sub>3</sub>O<sub>4</sub>. The mechanistic aspects and the role of cobalt and doping metal in the selective oxidation of alcohol have been studied thoroughly.