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A definitive assessment of the CO oxidation pattern of a nanocomposite MnCeOx catalyst

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Abstract

The CO oxidation pattern of a nanocomposite MnCeOx catalyst (M5C1; Mnat/Ceat, 5) in the range of 293–533 K (P, 1 atm) has been probed under a kinetic regime, varying reagent pressure (p0CO, 0.01–0.025 atm; λ0, 1), Image ID:c8re00026c-t1.gif ratio (λ0, 0.25–4.0) and CO2 co-feeding (0.05–0.10 atm). Activity data indicate fractional orders on pCO (0.6 ± 0.1) and pO2 (0.4 ± 0.1), with an activation energy of 40 ± 3 kJ mol−1, and a negative kinetic effect of CO2 co-feeding due to competitive adsorption processes. Coupled with systematic evidence on the reactivity and mobility of catalyst oxygen and surface intermediates, kinetic data disclose a concerted redox mechanism of Langmuir–Hinshelwood type, which starts by abstraction of O-atoms from surface active MnIV centres (r.d.s.), and is sustained by adsorption of diatomic oxygen species on O-vacancies. The derivative and integral forms of the formal rate equation explain the empirical kinetics, predicting the activity pattern of the MnCeOx catalyst in the range of 293–533 K.

Graphical abstract: A definitive assessment of the CO oxidation pattern of a nanocomposite MnCeOx catalyst

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Publication details

The article was received on 20 Feb 2018, accepted on 21 Mar 2018 and first published on 21 Mar 2018


Article type: Paper
DOI: 10.1039/C8RE00026C
Citation: React. Chem. Eng., 2018, Advance Article
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    A definitive assessment of the CO oxidation pattern of a nanocomposite MnCeOx catalyst

    F. Arena, R. di Chio, C. Espro, A. Palella and L. Spadaro, React. Chem. Eng., 2018, Advance Article , DOI: 10.1039/C8RE00026C

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