Selective gas-phase oxidation of ethanol by molecular oxygen over oxide and gold-containing catalysts
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- Koltunov, K.Y. & Sobolev, V.I. Catal. Ind. (2012) 4: 247. doi:10.1134/S2070050412040101
The rapid increase in the production rates of bioalcohols (in particular bioethanol) gives grounds for regarding them as a promising renewable chemical raw material for obtaining a number of useful organic synthesis products. In order to develop new green technologies for processing ethanol into value-added products, a systematic study of selective conversion of ethanol under conditions of oxidation by molecular oxygen in the flow gas-phase mode over such catalysts as V2O5-TiO2, mixed oxides V-Mo-Te, V-Mo-Nb and V-Mo-Te-Nb, and gold supported on oxide supports is performed. The catalytic activity is determined under conditions of temperature-programmed reaction under atmospheric pressure using a gas mixture (composition, mol %: EtOH, 2; O2, 18; He, 80) at a hourly space velocity of the mixture of 3600 h−1 over 0.25–0.5 mm catalyst fraction. The possibility of the efficient conversion of ethanol to products of partial oxidation and accompanying conversions (acetaldehyde, 90–99% yield; acetic acid, 92-98% yield; productive capacity >3 g g-cat−1 h−1) and acetic acid-ethyl acetate mixtures (1: 1 ratio, total yield >90%) in a number of cases is demonstrated.