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NH 3 ‐SCR Performance Enhancement of LDHs‐Based NiMnFe‐Mixed Oxides by Two‐Phase Coexistence and Cooperation
Author(s) -
Liu Xuezhen,
Du Yali,
Zou Chunlei,
Liu Lili,
Yang Baoshuan,
Wu Xu
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201902337
Subject(s) - calcination , catalysis , spinel , selectivity , phase (matter) , redox , ion , selective catalytic reduction , inorganic chemistry , chemistry , materials science , electron transfer , chemical engineering , metallurgy , organic chemistry , engineering , biochemistry
Mixed oxides with NiMnFe‐LDHs as precursors were synthesized and evaluated as catalysts in selective catalytic reduction of NO with NH 3 (NH 3 ‐SCR). Appropriate calcination temperature was identified to achieve optimal catalyst. The results pronouncedly affirmed that the catalytic performances of the as‐acquired catalysts were vulnerable to calcination temperature, where Ni 3 Mn 1 Fe 1 ‐600 presented preferable DeNO x activity with above 90% NO conversion and 98% N 2 selectivity in the range of 150‐360 °C. Multiple characterizations exhibited that the outstanding DeNO x activity was determined by the coexistence as well as cooperation of NiFe 2 O 4 spinel and Ni 6 MnO 8 phase, which could contribute more surface active sites, and synergetic effect arising from the electron transfer between Ni, Mn ions and Ni, Fe ions. Furthermore, a more rapid redox cycle and optimal DeNO x performance were resultantly accomplished.