Hydrothermal Aging Alleviates the Phosphorus Poisoning of Cu-SSZ-39 Catalysts for NH 3 -SCR Reaction

As a new type of catalyst with the potential for commercial application in NO removal from diesel engine exhausts, Cu-SSZ-39 catalysts must have excellent resistance to complex and harsh conditions. In this paper, the effects of phosphorus on Cu-SSZ-39 catalysts before and after hydrothermal aging t...

Full description

Saved in:
Bibliographic Details
Published in:Environmental science & technology 2023-03, Vol.57 (10), p.4113-4121
Main Authors: Chen, Junlin, Shan, Yulong, Sun, Yu, Ding, Wenqing, Xue, Sen, Han, Xuewang, Du, Jinpeng, Yan, Zidi, Yu, Yunbo, He, Hong
Format: Article
Language:English
Subjects:
Ammonia - chemistry
Catalysis
Copper
Oxidation-Reduction
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:As a new type of catalyst with the potential for commercial application in NO removal from diesel engine exhausts, Cu-SSZ-39 catalysts must have excellent resistance to complex and harsh conditions. In this paper, the effects of phosphorus on Cu-SSZ-39 catalysts before and after hydrothermal aging treatment were investigated. Compared with fresh Cu-SSZ-39 catalysts, phosphorus poisoning significantly decreased the low-temperature NH -SCR catalytic activity. However, such activity loss was alleviated by further hydrothermal aging treatment. To reveal the reason for this interesting result, a variety of characterization techniques including NMR, H -TPR, X-ray photoelectron spectroscopy, NH -TPD, and in situ DRIFTS measurements were employed. It was found that Cu-P species produced by phosphorus poisoning decreased the redox ability of active copper species, resulting in the observed low-temperature deactivation. After hydrothermal aging treatment, however, Cu-P species partly decomposed with the formation of active CuO species and a release of active copper species. As a result, the low-temperature NH -SCR catalytic activity of Cu-SSZ-39 catalysts was recovered.
ISSN:0013-936X
1520-5851
DOI:10.1021/acs.est.2c08876