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Understanding Reactivity and Stability of Rhodium Supported on Different Ceria Facets in Catalytic NO Reduction and CO/Hydrocarbon Oxidation Reactions

07 March 2023, Version 1
Working Paper
This content is a preprint and has not undergone peer review at the time of posting.

Abstract

Fully dispersed rhodium was supported on ceria with varying abundance of facets (100), (101) and (111). The resulting materials were evaluated for NO reduction by CO as well as CO/propylene oxidation under model and industrially relevant conditions. Very pronounced reactivity and stability differences were observed depending on the facet. Rh supported on (111) abundant ceria showed the highest activity and stability for all reactions. TPR and in-situ IR measurements revealed mechanistic details of NO reduction and CO oxidation, highlighting very different modes of interaction of Rh+3 ions on various facets and their contrasting reducibility, resulting in such pronounced catalytic activity changes.

Keywords

rhodium
ceria facets
catalysis
nitric oxide NO reduction
carbon monoxide CO oxidation
hydrocarbon oxidation

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Version History

Mar 07, 2023 Version 1

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The content is available under CC BY NC ND 4.0 [opens in a new tab]

DOI

10.26434/chemrxiv-2023-9ldvr
D O I: 10.26434/chemrxiv-2023-9ldvr [opens in a new tab]

Funding

The authors gratefully acknowledge the US Department of Energy (DOE), Energy Efficiency and Renewable Energy, Vehicle Technologies Office and PNNL CRADA with Stellantis for the support of this work. The research described in this paper was performed at Energy Science Laboratory (ESC), a national scientific user facility sponsored by the DOE’s Office of Biological and Environmental Research and located at Pacific Northwest National Laboratory (PNNL). PNNL is operated for the US DOE by Battelle.

Author’s competing interest statement

The author(s) have declared they have no conflict of interest with regard to this content

Ethics

The author(s) have declared ethics committee/IRB approval is not relevant to this content

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