NOx Storage and Release Activity on Pd/BEA Passive NOx Adsorber

Date

2017-05

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Abstract

Increasingly stringent vehicular emission regulation on NOx demands a better strategy to further mitigate tailpipe NOx exhaust. In terms of NOx reduction strategy, both current state-of-the-art technologies, selective catalytic reduction (SCR) and NOx storage and reduction (NSR), have shown optimal performance in warm conditions but are not fully functional at temperature below 200°C, commonly regarded cold-start condition. Thus, in order to mitigate NOx cold-start emission, the passive NOx adsorber (PNA) has been introduced. Among the potential PNAs, Pd/BEA stands out due to its promising NOx storage capacity and well-controlled thermal desorption performance. In this Masters thesis, NOx adsorption and desorption on Pd/BEA was studied using temperature-programmed desorption method. It was shown that CO improved NOx storage and induced NOx release to higher temperature on Pd/BEA where the chemical state of Pd is key. The desorption kinetics of NOx on Pd/BEA was also studied in an attempt to resolve the effect of heating rate on the controlled release of NOx.

Description

Keywords

Passive NOx adsorber, NOx abatement, Low temperature applications

Citation

Portions of this document appear in: Vu, Anh, Jinyong Luo, Junhui Li, and William S. Epling. "Effects of CO on Pd/BEA Passive NO x Adsorbers." Catalysis Letters 147, no. 3 (2017): 745-750.