Enhanced CO resistance of Pd/SSZ-13 for passive NOx adsorption
Artikel i vetenskaplig tidskrift, 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


Dawei Yao

Chalmers, Kemi och kemiteknik, Kemiteknik

Hoang Phuoc Ho

Chalmers, Kemi och kemiteknik, Kemiteknik

Rojin Feizie Ilmasani

Chalmers, Kemi och kemiteknik, Kemiteknik

Johann C. Wurzenberger


Thomas Glatz


Derek Creaser

Chalmers, Kemi och kemiteknik, Kemiteknik

Louise Olsson

Chalmers, Kemi och kemiteknik, Kemiteknik

Chemical Engineering Journal

1385-8947 (ISSN)

Vol. 460 141681


Kemiska processer

Annan kemiteknik

Annan materialteknik



Mer information

Senast uppdaterat