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NOx Removal Performance Optimization of NiMnTi Mixed Oxide Catalysts by Tuning the Redox Capability
Author(s) -
Wu Xu,
Li XiaoJian,
Du Yali,
Wang RuoNan,
Guo XingMei,
Hou BenHui
Publication year - 2019
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.201802050
Subject(s) - catalysis , nox , redox , calcination , inorganic chemistry , selectivity , materials science , oxide , mixed oxide , layered double hydroxides , chemical engineering , chemistry , metallurgy , organic chemistry , engineering , combustion
A series of Ni 4‐x Mn x Ti 1 O y mixed metal oxides (Ni 4‐x Mn x Ti 1 ‐LDO) catalysts originated from layered double hydroxides (LDHs) were fabricated and evaluated in the selective catalytic reduction of NO with NH 3 (NH 3 ‐SCR). To optimize the denitrification performance, the redox capability of catalysts was adjusted by calcining the Ni 4‐x Mn x Ti 1 ‐LDHs precursors with different Mn loading at different temperatures. The results revealed that calcination temperature was the secondary factor while the molar ratio of Mn to Ni was the main factor for influencing the redox properties. Among Ni 4‐x Mn x Ti 1 ‐LDO catalysts, the Ni 2 Mn 2 Ti 1 ‐LDO catalyst afforded the optimal DeNOx behavior with above 90 % NOx conversion and 95 % selectivity of N 2 as well as superior SO 2 resistance in the wide temperature region of 150–360 °C. Multiple characterizations indicated that exceptional catalytic performance of Ni 2 Mn 2 Ti 1 ‐LDO catalyst was highly dependent on the suitable redox capability resulted from moderate concentration of Ni 3+ , Mn 4+ and chemisorbed oxygen O β in catalysts surface.