Layered Pd/SSZ-13 with Cu/SSZ-13 as PNA − SCR dual-layer monolith catalyst for NOx abatement
Artikel i vetenskaplig tidskrift, 2020

A concept of a layered Pd/SSZ-13 with Cu/SSZ-13 as PNA-SCR dual-layer monolith catalyst for NOx abatement is demonstrated. NO-TPD was employed for determining the NOx storage, and the samples are characterized in detail using SEM-EDX, CO/NO-DRIFTS, XPS and H2-TPR. 750 °C hydrothermal treatment greatly promotes the NOx storage capacity and the addition of CO promotes NOx storage capacity and also shifts the NOx desorption temperature. The dual-layer sample (Pd/SSZ-13+Cu/SSZ-13) maintains most of the NOx storage capacity while the NOx desorption temperature is modified due to Cu/SSZ-13 as the top layer. The layered sample work well for NH3-SCR reaction. Notably, for Pd/SSZ-13+Cu/SSZ-13, more than 80 % of the NOx trapped at low temperature (i.e., 80 °C) can desorb in the suitable SCR temperature region where NOx conversion higher than 80 % is found. However, some loss of NO storage is found after SCR experiments. Overall, the dual-layer concept shows interesting potential for NOx abatement, but requires further developments on the PNA material to ensure stable storage capacity.

Layered catalyst

Selective catalytic reduction

Zeolite

Passive NO adsorber x

Cold start

Författare

Aiyong Wang

Chalmers, Kemi och kemiteknik, Kemiteknik, Kemisk apparatteknik

Kunpeng Xie

Chalmers, Kemi och kemiteknik, Kemiteknik, Kemisk apparatteknik

A. Kumar

Cummins Inc.

K. Kamasamudram

Cummins Inc.

Louise Olsson

Chalmers, Kemi och kemiteknik, Kemiteknik

Catalysis Today

0920-5861 (ISSN)

Vol. In press

Ämneskategorier

Materialkemi

Annan kemiteknik

Annan kemi

DOI

10.1016/j.cattod.2020.01.035

Mer information

Senast uppdaterat

2020-02-14