NOx Removal by Selective Catalytic Reduction with Ammonia over a Hydrotalcite-Derived NiFe Mixed Oxide
A series of NiFe mixed oxide catalysts were prepared via calcining hydrotalcite-like precursors for the selective catalytic reduction of nitrogen oxides (NOx) with NH3 (NH3-SCR). Multiple characterizations revealed that catalytic performance was highly dependent on the phase composition, which was v...
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doaj-08b018eac6874c9881caa2fe7d61f6a22020-11-25T00:38:49ZengMDPI AGCatalysts2073-43442018-09-018938410.3390/catal8090384catal8090384NOx Removal by Selective Catalytic Reduction with Ammonia over a Hydrotalcite-Derived NiFe Mixed OxideRuonan Wang0Xu Wu1Chunlei Zou2Xiaojian Li3Yali Du4College of chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Chemistry and Chemical Engineering, Jinzhong University, Jinzhong 030619, ChinaA series of NiFe mixed oxide catalysts were prepared via calcining hydrotalcite-like precursors for the selective catalytic reduction of nitrogen oxides (NOx) with NH3 (NH3-SCR). Multiple characterizations revealed that catalytic performance was highly dependent on the phase composition, which was vulnerable to the calcination temperature. The MOx phase (M = Ni or Fe) formed at a lower calcination temperature would induce more favorable contents of Fe2+ and Ni3+ and as a result contribute to the better redox capacity and low-temperature activity. In comparison, NiFe2O4 phase emerged at a higher calcination temperature, which was expected to generate more Fe species on the surface and lead to a stable structure, better high-temperature activity, preferable SO2 resistance, and catalytic stability. The optimum NiFe-500 catalyst incorporated the above virtues and afforded excellent denitration (DeNOx) activity (over 85% NOx conversion with nearly 98% N2 selectivity in the region of 210–360 °C), superior SO2 resistance, and catalytic stability.http://www.mdpi.com/2073-4344/8/9/384NiFe-LDHmixed oxideNiFe2O4 spinelNOxNH3-SCR |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Ruonan Wang Xu Wu Chunlei Zou Xiaojian Li Yali Du |
spellingShingle |
Ruonan Wang Xu Wu Chunlei Zou Xiaojian Li Yali Du NOx Removal by Selective Catalytic Reduction with Ammonia over a Hydrotalcite-Derived NiFe Mixed Oxide Catalysts NiFe-LDH mixed oxide NiFe2O4 spinel NOx NH3-SCR |
author_facet |
Ruonan Wang Xu Wu Chunlei Zou Xiaojian Li Yali Du |
author_sort |
Ruonan Wang |
title |
NOx Removal by Selective Catalytic Reduction with Ammonia over a Hydrotalcite-Derived NiFe Mixed Oxide |
title_short |
NOx Removal by Selective Catalytic Reduction with Ammonia over a Hydrotalcite-Derived NiFe Mixed Oxide |
title_full |
NOx Removal by Selective Catalytic Reduction with Ammonia over a Hydrotalcite-Derived NiFe Mixed Oxide |
title_fullStr |
NOx Removal by Selective Catalytic Reduction with Ammonia over a Hydrotalcite-Derived NiFe Mixed Oxide |
title_full_unstemmed |
NOx Removal by Selective Catalytic Reduction with Ammonia over a Hydrotalcite-Derived NiFe Mixed Oxide |
title_sort |
nox removal by selective catalytic reduction with ammonia over a hydrotalcite-derived nife mixed oxide |
publisher |
MDPI AG |
series |
Catalysts |
issn |
2073-4344 |
publishDate |
2018-09-01 |
description |
A series of NiFe mixed oxide catalysts were prepared via calcining hydrotalcite-like precursors for the selective catalytic reduction of nitrogen oxides (NOx) with NH3 (NH3-SCR). Multiple characterizations revealed that catalytic performance was highly dependent on the phase composition, which was vulnerable to the calcination temperature. The MOx phase (M = Ni or Fe) formed at a lower calcination temperature would induce more favorable contents of Fe2+ and Ni3+ and as a result contribute to the better redox capacity and low-temperature activity. In comparison, NiFe2O4 phase emerged at a higher calcination temperature, which was expected to generate more Fe species on the surface and lead to a stable structure, better high-temperature activity, preferable SO2 resistance, and catalytic stability. The optimum NiFe-500 catalyst incorporated the above virtues and afforded excellent denitration (DeNOx) activity (over 85% NOx conversion with nearly 98% N2 selectivity in the region of 210–360 °C), superior SO2 resistance, and catalytic stability. |
topic |
NiFe-LDH mixed oxide NiFe2O4 spinel NOx NH3-SCR |
url |
http://www.mdpi.com/2073-4344/8/9/384 |
work_keys_str_mv |
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