Abstract
This work demonstrates the preparation of zinc cobalt oxide materials (ZCO-1, ZCO-2, and ZCO-3) via thermal annealing of novel zinc cobalt acetate hydroxide precursors prepared in three different Co/Zn molar ratios (2:1, 1:1, and 1:2). Among these, the ZCO-1 sample displayed superior catalytic activity for the dehydrogenative oxidation of alcohols to carboxylic acids, exhibiting wide substrate applicability and high yield output with concomitant evolution of hydrogen gas (latent fuel) under oxidant-free conditions. The high catalytic activity of ZCO-1 can be accredited to synergistic effects arising from a balanced molar ratio of Co/Zn (2:1), which led to the formation of pure spinel-structured zinc cobalt oxide and a sufficiently high surface area capable of furnishing copious active sites, resulting in faster reaction kinetics and higher productivity. Moreover, the practical utility of the current protocol was displayed via ZCO-1-catalyzed gram-scale synthesis of value-added chemicals like nicotinic acid, terephthalic acid, and succinic acid.
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