Enhanced CO resistance of Pd/SSZ-13 for passive NOx adsorption
Journal article, 2023

Passive NOx adsorption (PNA) is a novel technology to control NOx emissions during cold start. However, the recent generation of PNA material, Pd/zeolite, suffers from major degradation under high CO concentrations. In this work, we developed a novel form of Pd/SSZ-13 by using a freeze-drying process after incipient wetness impregnation. This Pd/SSZ-13 showed a better stability than the sample synthesized by the common process. Several characterization measurements were conducted and it was found that the Pd sites on the freeze-dried sample were more resistant towards CO-induced agglomeration. By combing in-situ characterization and kinetic modeling, we found that the freeze-dried Pd/SSZ-13 had more ion-exchanged Pd sites, which provided greater resistance towards the CO-induced Ostwald ripening process, and consequently suppressed the sintering behavior under a high CO concentration. This material offers a potentially improved stability of PNAs under extremely high CO concentration pulses from incomplete diesel combustion during engine cold start.

Ostwald ripening

Passive NOx adsorption

Pd sintering

CO tolerance

Kinetic model

Author

Dawei Yao

Chalmers, Chemistry and Chemical Engineering, Chemical Technology

Hoang Phuoc Ho

Chalmers, Chemistry and Chemical Engineering, Chemical Technology

Rojin Feizie Ilmasani

Chalmers, Chemistry and Chemical Engineering, Chemical Technology

Johann C. Wurzenberger

AVL

Thomas Glatz

AVL

Derek Creaser

Chalmers, Chemistry and Chemical Engineering, Chemical Technology

Louise Olsson

Chalmers, Chemistry and Chemical Engineering, Chemical Technology

Chemical Engineering Journal

1385-8947 (ISSN)

Vol. 460 141681

Subject Categories

Chemical Process Engineering

Other Chemical Engineering

Other Materials Engineering

DOI

10.1016/j.cej.2023.141681

More information

Latest update

2/16/2023