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High activity and wide temperature window of Fe‐Cu‐SSZ‐13 in the selective catalytic reduction of NO with ammonia
Author(s) -
Zhang Tao,
Li Jianmei,
Liu Jian,
Wang Daxi,
Zhao Zhen,
Cheng Kai,
Li Junhua
Publication year - 2015
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.14923
Subject(s) - ammonia , selective catalytic reduction , reduction (mathematics) , catalysis , window (computing) , chemistry , ammonia production , thermodynamics , inorganic chemistry , chemical engineering , materials science , physics , engineering , organic chemistry , computer science , mathematics , geometry , operating system
Fe‐Cu‐SSZ‐13 catalysts were prepared by aqueous solution ion‐exchange method based on the one‐pot synthesized Cu‐SSZ‐13. The catalysts were applied to the selective catalytic reduction (SCR) of NO with NH 3 and characterized by the means of XRD, UV‐Vis, EPR, XPS, NH 3 ‐TPD, and so on. The selected Fe‐Cu‐SSZ‐13‐1 catalyst exhibited the high NO conversion (>90%) in the wide temperature range (225–625°C), which also showed good N 2 selectivity and excellent hydrothermal stability. The results of XPS showed that the Cu and Fe species were in the internal and outer parts of the SSZ‐13 crystals, respectively. The results of UV‐Vis and EPR indicated that the monomeric Cu 2+ ions coordinated to three oxygen atoms on the six‐ring sites and Fe monomers are the real active species in the NH 3 ‐SCR reaction. Furthermore, the influence of intracrystalline mass‐transfer limitations on the Fe‐Cu‐SSZ‐13 catalysts is related to the location of active species in the SSZ‐13 crystals. © 2015 American Institute of Chemical Engineers AIChE J , 61: 3825–3837, 2015