Total Oxidation of Oxygenated Organic Compounds

Partial substitution of these perovskites by noble metals enhances the activity to total oxidation even when the catalysts are exposed to reaction conditions specific to partial oxidation [43]. 

Alcohols (methanol, ethanol, 2-propanol, and -propanol), aldehydes (formaldehyde), ketones (acetone), and esters (ethylacetate) are considered oxygenated VOC environmental pollutants and, therefore, their emissions are under a permanent control [44]. 

The effect of the preparation procedure onto the catalytic behavior in the oxidation of M-butanol was also underlined for Co-Mg mixed oxides prepared via an assisted ultrasonic procedure [47]. Comparing with catalysts prepared via the classic solid-solid reactions, these catalysts showed both a greater activity and a greater selectivity to CO2 and H2O. 

Ethanol is also considered a VOC, and literature reported its total oxidation over Lai ,Ca j,Mn03 perovskites prepared by the citrate method [49]. Pure unsubstituted perovskite phases, LaMnOs, presented a certain amount of Mn and cationic vacancies, which is generally called oxidative nonstoichiometry. The electronic unbalance yield by the partial substitution of lanthanum by calcium caused an oxidation state increase of part of the manganese occupying the B sites of the structure. Concurrently, the amount of cationic vacancies decreased with the increase of calcium amount. In spite of these differences, the catalytic activity in the combustion of ethanol showed no evident differences with the value of X and the total oxidation was achieved on all the compositions at temperatures below 220 °C. 

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