Effect of active metal loading on catalyst structure and performance in room temperature oxidation of acetone by ozone

Abstract

Room temperature ozonation of gaseous acetone was performed using CoOx/γ-alumina catalyst with different cobalt loadings. Turnover frequency of acetone removal increased by decreasing metal loading of the catalyst. A comprehensive catalyst characterization showed that variation in cobalt loading altered the local environment of cobalt. Enhanced performance of the catalysts with lower cobalt loadings were attributed to (a) increase in cobalt dispersion from 4% in Co10% to 16% in Co2.5% (b) decrease in oxidation state of cobalt from Co(II,III) to Co(II), which resulted in improved electron transferring ability and ozone utilization.