Abstract
The application of electric field promotes benzene oxidation significantly over Pd/CoxCey catalysts. For 1% Pd loading catalysts, the complete oxidation of benzene can be realized at 175 °C with an electric field under an input current of 3 mA, 79 °C lower than the temperature demanded for complete benzene conversion without electric field. The introduction of electric field can save Pd loading in the catalysts while maintaining high benzene conversion. The characterization experiments showed that CeO2 reduction was accelerated with electric field and created more active oxygen, promoting the formation of active sites on the catalyst surface. The OH removal ability of PdO was enhanced by forming CoO(OH) species, which can easily dehydroxylate since the reduction of Co3+ was promoted by the electric field. The optimized Ce/Co ratio is a balance between oxygen availability and OH removal ability.
Highlights
Nowadays, volatile organic compound (VOC) abatement has aroused wide concern due to its harmful effects on human health and the environment [1]
Complete benzene conversion over the most effective catalysts that have been studied cannot be achieved below 200 ◦ C [5,10,11,12] and a high loading of noble metal is demanded to further promote the catalytic activity, leading to increasing costs of catalysts
More effort should be focused on cutting down noble metal loading while maintaining high catalytic activity
Summary
Volatile organic compound (VOC) abatement has aroused wide concern due to its harmful effects on human health and the environment [1]. Complete benzene conversion over the most effective catalysts that have been studied cannot be achieved below 200 ◦ C [5,10,11,12] and a high loading of noble metal is demanded to further promote the catalytic activity, leading to increasing costs of catalysts. Study, the electric field was applied to improve benzene oxidation over Pd based catalysts. A series of x%Pd/Com Cen x%Pd/Co. Cen catalysts wereand synthesized and the electric field promoted catalytic system catalysts mwere synthesized applied in theapplied electricinfield promoted catalytic system for benzene for benzene oxidation. The promoting effect of the electric field on catalytic activity was investigated oxidation.
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