Development of Cobalt Oxide Nanocomposite Catalyst from Cobalt Aluminum Layered Double Hydroxide Precursor Towards Aerobic Alcohol Oxidation

Abstract

The A n− /CoAl LDH_ x precursors with various interlayer anions (A n− ) and Co 2+ to Al 3+ ratios ( x ) were successfully synthesized using the co-precipitation method under alkaline conditions. The XRD profiles of the as-prepared A n− /CoAl LDH_ x resembles the typical pattern of hydrotalcite materials without any presence of impurities. The TG-DTA analysis revealed that different types of interlayer anions led to the formation of LDH with different thermal behavior. The cobalt aluminum oxide nanocomposite, A n− /CoAl_ x _ T , was obtained after calcination of A n− /CoAl LDH_ x at T K for 2 h, and it was applied as a heterogeneous catalyst for aerobic oxidation of 1-phenyl ethanol to acetophenone using molecular oxygen as a sole oxidant. The A n− /CoAl_ x _ T acted as efficient catalyst for aerobic oxidation of 1-phenyl ethanol. Among The A n− /CoAl_ x _ T catalysts tested, CO 32− /CoAl_3_573 gave the most outstanding catalytic performance with the acetophenone yield of 89%. Another report shows that a highly reducible CuO could