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Operando XAFS investigation on the effect of ash deposition on three-way catalyst used in gasoline particulate filters and the effect of the manufacturing process on the catalytic activity

Panchal, Monik, Callison, June, Skukauskas, Vainius, Gianolio, Diego, Cibin, Giannantonio, York, Andrew P. E., Schuster, Manfred E., Hyde, Timothy I., Collier, Paul, Catlow, C. Richard A. and Gibson, Emma K. 2021. Operando XAFS investigation on the effect of ash deposition on three-way catalyst used in gasoline particulate filters and the effect of the manufacturing process on the catalytic activity. Journal of Physics: Condensed Matter 33 (28) , 284001. 10.1088/1361-648X/abfe16

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Abstract

Platinum group metals such as palladium and rhodium based catalysts are currently being implemented in gasoline particulate filter (GPF) autoexhaust after treatment systems. However, little is known about how the trapped particulate matter, such as the incombustible ash, interacts with the catalyst and so may affect its performance. This operando study follows the evolution of the Pd found in two different model GPF systems: one containing ash components extracted from a GPF and another from a catalyst washcoat prior to adhesion onto the GPF. We show that the catalytic activity of the two systems vary when compared with a 0 g ash containing GPF. Compared to the 0 g ash sample the 20 g ash containing sample had a higher CO light off temperature, in addition, an oscillation profile for CO, CO2 and O2 was observed, which is speculated to be a combination of CO oxidation, C deposition via a Boudouard reaction and further partial oxidation of the deposited species to CO. During the ageing procedure the washcoat sample reduces NO at a lower temperature than the 0 g ash sample. However, post ageing the 0 g ash sample recovers and both samples reduce NO at 310 °C. In comparison, the 20 g ash GPF sample maintains a higher NO reduction temperature of 410 °C post ageing, implying that the combination of high temperature ageing and presence of ash has an irreversible negative effect on catalyst performance.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Additional Information: Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence.
Publisher: IOP Publishing
ISSN: 0953-8984
Funders: EPSRC and Johnson Matthey
Date of First Compliant Deposit: 21 June 2021
Date of Acceptance: 4 May 2021
Last Modified: 28 Sep 2022 08:13
URI: https://orca.cardiff.ac.uk/id/eprint/142025

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