Catalytic activity of Co–Mg mixed oxides in the VOC oxidation: Effects of ultrasonic assisted in the synthesis

Abstract

Ultrasound effect in the synthesis of catalysts of cobalt oxides prepared starting from the coprecipitation method of a hydrotalcite structure was evaluated in this work and characterized by DRX, FRX, BET, TPR and TPO. It is found that catalytic conversion of butanol on the Co–Mg–Al mixed oxides prepared by ultrasound method (10 min) is higher than that on the Co–Mg–Al mixed oxides prepared by conventional treatment (24 h). The surface area and the butanol oxidation are linearly related to the content of the hydrotalcite-like phase in the precursor, which resulted in highly dispersed Co (Co 2+), MgO and A1 2O 3 particles in the final catalyst. Similarly, the use of ultrasound in the synthesis reveals a benefic effect in so far as similar solids are obtained in much less time. The catalysts show greater activity and selectivity to CO 2 and H 2O than the commercial ones.