Abstract
The ordered mesoporous Al2O3 material was employed as support to prepare the CeO2-Co3O4 binary oxide catalysts for N2O-assisted oxidative dehydrogenation of ethylbenzene (EB), which was treated both as an effective method of styrene (ST) production and a high value-added utilization of the greenhouse gas. The catalytic performance was observed for the optimal 0.3Ce-7Co/OMA catalyst, which achieved 52.1% EB conversion with 88.7% selectivity toward ST at temperature as low as 500 ºC, far exceeding any other reported catalyst systems. Characterization results showed that an increase in the Co content led to a partial destruction of the order degree of pores, but maintained the mesoporous structure. The Ce modification not only decreased the particle size (<12 nm), considerably boosting the specific surface area, but also weakened the Co-O bond, making more O species available for the EB conversion. Studies on the carbon deposition formed during the catalytic runs revealed that the carbon deposited at the initial stage of reaction acted directly as the catalytically active sites enhanced the EB conversion. As the reaction progressed, the dynamic equilibrium between carbon deposition and burning relieved the loss of active sites and maintained the stability of catalyst activity. In addition, the excellent regeneration property of 0.3Ce-7Co/OMA catalyst indicated that N2O, which was used as an oxidizing agent, protected the catalyst against the formation of inactive carbonaceous deposition.
Published Version
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