Jump to main content
Jump to site search

Issue 3, 2018

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

Author affiliations

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

Supplementary files

Article information


Submitted
20 Feb 2018
Accepted
21 Mar 2018
First published
21 Mar 2018

React. Chem. Eng., 2018,3, 293-300
Article type
Paper

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, 3, 293 DOI: 10.1039/C8RE00026C

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.


Social activity

Search articles by author

Spotlight

Advertisements