Abstract
Abstract MnO 2 -ZrO 2 binary oxide catalytic system was applied for the effective utilization of CO 2 as an oxidant in the ethylbenzene dehydrogenation (EBD) to styrene monomer (SM). MnO 2 -ZrO 2 oxides were prepared by co-precipitation method and characterized as solid solution mixture having surface area more than 100 2 g −1 . 10% MnO 2 -ZrO 2 mixed oxide catalyst exhibited conversion of 73% with the selectivity of 98% at 650 °C. The MnO 2 -ZrO 2 binary oxides were X-ray amorphous whereas the individual oxides (MnO 2 and ZrO 2 ) having much lower surface areas were crystalline in nature. As a result, MnO 2 -ZrO 2 binary oxides exhibited greatly elevated catalytic activity for the conversion of ethylbenzene (EB) than those of individual oxides in the presence of CO 2 . However, in the absence of CO 2 poor catalytic activity and stabilities were observed. Gradual enhancement of activities were demonstrated in the higher CO 2 to EB ratios. Hence, CO 2 had a profound role as a soft oxidant by improving both activity and stability in the EBD over MnO 2 -ZrO 2 mixed oxide catalysts.
Published Version
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