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A detailed insight into the catalytic reduction of NO operated by Cr–Cu nanostructures embedded in a CeO2 surface

Abstract

Replacing rare and expensive elements, such as Pt, Pd, and Rh commonly used in catalytic devices, with more abundant and less expensive ones is a mandatory issue to realize efficient, sustainable and economically appealing three–way catalysts. In this context, the surface of a Cr–Cu/CeO2 system represents a versatile catalyst for the conversion of toxic NO into harmless N2. Yet, a clear picture of the underlying mechanism is still missing. We provide here a detailed insight into such a reaction mechanism by a combined experimental and theoretical study. Fourier- transform infrared spectroscopy is used to detect all the products resulting from catalytic reactions of NO and CO on the surface of a Cr–Cu/CeO2 nanocatlayst. CO pulsing experiments unveil that reactions of CO with O atoms at the Cr–Cu/CeO2 surface are the major responsible for the formation of surface vacancies. On these grounds, a comprehensive picture of the NO reduction and the role of both Cu and Cr dopants and vacancies is rationalized by first–principles modeling. Our findings provide a general route for the realization of ceria-based cost-effective catalysts.

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Publication details

The article was accepted on 02 Aug 2018 and first published on 08 Aug 2018


Article type: Paper
DOI: 10.1039/C8CP04314K
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    A detailed insight into the catalytic reduction of NO operated by Cr–Cu nanostructures embedded in a CeO2 surface

    K. Koizumi, H. Yoshida, M. BOERO, K. Tamai, S. Hosokawa, T. Tanaka, K. Nobusada and M. Machida, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C8CP04314K

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