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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

DOI: 10.1088/1361-648X/abfe16 DOI Help

Authors: Monik Panchal (University College London) , June Callison (UK Catalysis Hub, Research Complex at Harwell) , Vainius Skukauskas (University of Glasgow) , Diego Gianolio (Diamond Light Source) , Giannantonio Cibin (Diamond Light Source) , Andrew P. E. York (Johnson Matthey Plc) , Manfred Erwin Schuster (Johnson Matthey Plc) , Timothy I. Hyde (Johnson Matthey Plc) , Paul Collier (Johnson Matthey Plc) , C. Richard A. Catlow (University College London) , Emma K. Gibson (University of Glasgow)
Co-authored by industrial partner: Yes

Type: Journal Paper
Journal: Journal Of Physics: Condensed Matter

State: Published (Approved)
Published: May 2021
Diamond Proposal Number(s): 24156

Open Access Open Access

Abstract: Platinum group metals (PGM) such as palladium and rhodium based catalysts are currently being implemented in Gasoline Particulate Filter (GPF) autoexhaust aftertreatment 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 circleC. In comparison, the 20 g ash GPF sample maintains a higher NO reduction temperature of 410 circleC post ageing, implying that the combination of high temperature ageing and presence of ash has an irreversible negative effect on catalyst performance.

Subject Areas: Chemistry, Materials


Instruments: B18-Core EXAFS

Added On: 10/05/2021 15:00

Documents:
Panchal+et+al_2021_J._Phys.%3A_Condens._Matter_10.1088_1361-648X_abfe16.pdf

Discipline Tags:

Catalysis Physical Chemistry Materials Science Chemistry

Technical Tags:

Spectroscopy X-ray Absorption Spectroscopy (XAS) Extended X-ray Absorption Fine Structure (EXAFS)