Title :

Promotional Effect of the Periodic Rich and Lean Switching on the Performance of Three-Way Catalysts and Influence of Metal Zone-Coating

Author(s) :

Elgayyar, T. [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Richard, Mélissandre [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Chaillou, C. [Auteur]
Dujardin, Christophe [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Granger, Pascal [Auteur]
UCCS Équipe Catalyse pour une transition énergétique durable et l’environnement [CASETE]
Laigle, E. [Auteur]
Norsic, C. [Auteur]

Journal title :

Top. Catal.

Abbreviated title :

Top. Catal.

Volume number :

-

Pages :

-

Publication date :

2024-11-18

ISSN :

1022-5528

English keyword(s) :

Three-way catalysis
Monolith
Metal zone-coating
Rich/lean transient conditions
Realistic exhaust gas matrix

HAL domain(s) :

Chimie/Catalyse

English abstract : [en]

Increasingly stricter regulations for vehicle emissions require more competitive exhaust emission control systems. Three-way catalysis is a major up-to-date emission control technology, though the activity could be limited ...
Show more >Increasingly stricter regulations for vehicle emissions require more competitive exhaust emission control systems. Three-way catalysis is a major up-to-date emission control technology, though the activity could be limited during the cold start as well as steady state operation including the three regimes: rich (λ<1), lean (λ>1), and stoichiometric (λ=1). Periodic rich/lean switching emerges as a promising strategy to address this challenge. In this work, we investigate the influence of the switching process, using a fixed lambda air-to-fuel ratio amplitude of λ = 1±0.02 (0.5 Hz), on pollutant conversion from 100 to 400 °C, under a complex matrix including nitrogen monoxide (NO), carbon monoxide (CO), hydrogen (H2), and hydrocarbons (C1-C5), simulating the typical car exhaust gas. Moreover, two catalysts were tested: one homogeneously coated with Pd, and another zone-coated with Pd, both containing the same total amount of Pd, in order to identify the effect of the catalyst zone-coating and rationalize the use of increasingly scarce platinum group metals. Simple binary pollutant oxidation reactions were also performed to determine the reactivity of individual pollutant gases. Interestingly, NO, CH4 and C5H12 displayed highest conversions during the switching regime compared to steady-state periods, attributed to the beneficial balance between active site poisoning/regeneration during the rich/lean regimes respectively. The zone-coated catalyst showed an overall higher activity under the full gas mixture that could be explained by a slightly higher Pd content, more effective Pd-support interactions, exothermic effect or the better OSC properties.Show less >

Language :

Anglais

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

Université de Lille
CNRS
Centrale Lille
ENSCL
Univ. Artois

Collections :

• Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181

Research team(s) :

Remédiation et matériaux catalytiques (REMCAT)

Submission date :

2025-04-10T21:01:27Z
2025-04-23T07:48:51Z