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Effect of CO 2 on the DeNO x Activity of a Small Pore Zeolite Copper Catalyst for NH 3 /SCR
Author(s) -
Kim Young Jin,
Min Kyung Myung,
Lee Jun Kyu,
Hong Suk Bong,
Cho Byong K.,
Nam InSik
Publication year - 2014
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201400093
Subject(s) - chemistry , nox , catalysis , zeolite , adsorption , inorganic chemistry , copper , selective catalytic reduction , denticity , nuclear chemistry , metal , combustion , organic chemistry
Abstract Exposure of CuSSZ13 to CO 2 at temperatures below 300 °C can deactivate its low‐temperature deNOx activity during NH 3 /SCR, with the severity of deactivation being dependent on reaction temperature. The adsorption of NO on Cu 2+ ion is inhibited by CO 2 due to its competitive adsorption, while NH 3 adsorption on acidic sites of CuSSZ13 is largely unaffected by CO 2 , as evidenced by NO‐ and NH 3 ‐TPD in the presence of CO 2 . Under O 2 ‐rich conditions, CO 2 forms unidentate carbonates on Cu 2+ sites suppressing the formation of nitrates, a key reaction intermediate essential for NOx reduction during the NH 3 /SCR reaction, as revealed in an in situ FTIR study.