Contact dynamics for a solid-solid reaction mediated by gas-phase oxygen

Study on the soot oxidation over ceria-based catalysts

Journal article (2016)

Authors

Marco Piumetti Politecnico di Torino
B. van der Linden , ChemE/O&O groep - AS
Paolo Miceli Politecnico di Torino
Debora Fino Politecnico di Torino
Nunzio Russo Politecnico di Torino
Samir Bensaid Politecnico di Torino
Copyright: © 2016 Marco Piumetti, B. van der Linden, M. Makkee, Paolo Miceli, Debora Fino, Nunzio Russo, Samir Bensaid
DOI
help_outline
https://doi.org/10.1016/j.apcatb.2016.06.006
Ceria Accessible surface area Nanocatalysts Nanostructured ceria Soot oxidation Soot-catalyst contact points
More Info
expand_more

Published Date

15-12-2016

Language

English

Reuse Rights

Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.

Abstract

Ceria-based catalysts with different topological and textural properties have been prepared to study the role of the soot-catalyst contact on the soot oxidation reaction. The physico-chemical features of the catalysts have been investigated by means of complementary techniques, such as powder XRD, N2 physisorption at -196 °C, optical microscopy at variable temperature, FESEM, TEM, and thermogravimetric analysis.As a whole, the best catalytic activity has been obtained with the CeO2-nanocubes (denoted to as "Ce-NC") because of their higher intrinsic reactivity. On the other hand, high-surface area materials prepared by the cerium nitrate decomposition (denoted to as "Ce-ND") or hydrothermal route (CeO2-stars, referred to as "Ce-SAS") resulted less effective toward the soot combustion, confirming the surface-sensitivity for this reaction.Moreover, it has been proven a higher dependence of the oxidation activity on the catalyst-to-soot ratio (wt./wt.) for the nanostructured catalyst (Ce-NC) exhibiting the lowest BET specific surface area (SBET = 4 m2 g-1). On the other hand, the accessible (real) surface area, at variance of the BET surface area, seems to play a relevant role for this solid-solid reaction mediated by gas-phase oxygen.