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...
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Veröffentlicht in: | Environmental science & technology 2023-03, Vol.57 (10), p.4113-4121 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | 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. |
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ISSN: | 0013-936X 1520-5851 |
DOI: | 10.1021/acs.est.2c08876 |