Insights into Synergy of Copper and Acid Sites for Selective Catalytic Reduction of NO with Ammonia over Zeolite Catalysts

Autor:	Wenyi Zhao, Menglin Shen, Yueran Zhu, Xudong Ren, Xingang Li
Rok vydání:	2023
Předmět:	acid sites NH3-SCR copper cations zeolite Physical and Theoretical Chemistry NO3− species Catalysis General Environmental Science
Zdroj:	Catalysts Volume 13 Issue 2 Pages: 301
ISSN:	2073-4344
DOI:	10.3390/catal13020301
Popis:	Herein, we report the function of copper sites in Cu-SSZ-13, Cu-ZSM-5 and Cu-Beta catalysts with the same Si/Al ratio (14) and Cu/Al ratio (0.4) on selective catalytic reduction of NO with NH3 (NH3-SCR) and reveal the relationship between active sites (Cu sites, acid sites) and catalytic activity. The results show that the amount of isolated Cu2+ ions in the catalysts directly determines the formation of strong Lewis acid sites and reaction intermediate NO3− ions, thus affecting the low-temperature SCR performance, while the amount of highly stable Cu+ ions and Brønsted acid sites is related to the high-temperature SCR performance of the catalysts. Consequently, it contains enough isolated Cu2+ ions, highly stable Cu+ ions and Brønsted acid sites, which endows Cu-SSZ-13 with excellent NH3-SCR activity.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8bb016b543d12ebf357880a860840856 https://doi.org/10.3390/catal13020301 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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