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

Abstract

The Aⁿ⁻/CoAl LDH_x precursors with various interlayer anions (Aⁿ⁻) and Co²⁺ to Al³⁺ ratios (x) were successfully synthesized using the co-precipitation method under alkaline conditions. The XRD profiles of the as-prepared Aⁿ⁻/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, Aⁿ⁻/CoAl_x_T, was obtained after calcination of Aⁿ⁻/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 Aⁿ⁻/CoAl_x_T acted as efficient catalyst for aerobic oxidation of 1-phenyl ethanol. Among The Aⁿ⁻/CoAl_x_T catalysts tested, CO₃²⁻/CoAl_3_573 gave the most outstanding catalytic performance with the acetophenone yield of 89%.