Layered Pd/SSZ-13 with Cu/SSZ-13 as PNA−SCR Dual-Layer Monolith Catalyst for NOx Abatement
Journal article, 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.

Passive NOx adsorber

Zeolite

Cold start

Layered catalyst

Selective catalytic reduction

Author

Aiyong Wang

Chalmers, Chemistry and Chemical Engineering, Chemical Technology, Chemical Engineering Design

Kunpeng Xie

Chalmers, Chemistry and Chemical Engineering, Chemical Technology, Chemical Engineering Design

Ashok Kumar

Krishna Kamasamudram

Louise Olsson

Chalmers, Chemistry and Chemical Engineering, Chemical Technology

Catalysis Today

0920-5861 (ISSN)

Driving Forces

Sustainable development

Areas of Advance

Transport

Roots

Basic sciences

Subject Categories

Chemical Engineering

DOI

10.1016/j.cattod.2020.01.035

More information

Created

2/14/2020