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The Influence of Support Composition on the Activity of Cu:Ce Catalysts for Selective Catalytic Reduction of NO by CO in the Presence of Excess Oxygen

Abstract

The catalytic activity of a series of Cu1:Ce3 catalysts supported on different supports (CNT, AC, TiO2, γ-Al2O3, and SiC) was studied for NO reduction by CO in the presence of excess oxygen. The effects of support on physicochemical properties of the Cu1:Ce3 catalysts were characterized by SEM, TEM, N2 adsorption–desorption, FTIR, XRD, XPS, CO-TPD, and NO-TPD techniques. The highest activity in the presence of oxygen was observed for the Cu1:Ce3/Al2O3 catalyst, and the NO conversion of 71.8% obtained at 420 °C in the presence of 5% oxygen. The catalytic activity of the catalysts was significantly related to the synergistic interactions between surface oxygen vacancies and Cu+ species in the catalysts, as well as the electron transfer and metal/support interface. The high activity of the Al2O3 supported catalyst in the presence of oxygen is attributed to the presence of catalytically active centers on the support as well as on the surface of the supported crystallites. The NO conversion slightly increased after increasing the O2 concentration from 2% to 5%, due to the adsorption of more O2 on the surface and providing more adsorbed O, reacted with adsorbed CO to form CO2 and provide oxygen vacancy for NO adsorption and dissociation. The adsorbed O can react with NO, form NO2, which quickly reacts with CO to form N2 and CO2. The possible reaction mechanism was proposed for the reaction in the presence of excess oxygen.

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Publication details

The article was received on 21 Aug 2019, accepted on 27 Nov 2019 and first published on 27 Nov 2019


Article type: Paper
DOI: 10.1039/C9NJ04335G
New J. Chem., 2019, Accepted Manuscript

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    The Influence of Support Composition on the Activity of Cu:Ce Catalysts for Selective Catalytic Reduction of NO by CO in the Presence of Excess Oxygen

    Z. Gholami, G. Luo and F. Gholami, New J. Chem., 2019, Accepted Manuscript , DOI: 10.1039/C9NJ04335G

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