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- Title
NO<sub>x</sub> Removal by Selective Catalytic Reduction with Ammonia over a Hydrotalcite-Derived NiFe Mixed Oxide.
- Authors
Ruonan Wang; Xu Wu; Chunlei Zou; Xiaojian Li; Yali Du
- Abstract
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.
- Subjects
SELECTIVE catalytic oxidation; MIXED oxide catalysts; SPINEL
- Publication
Catalysts (2073-4344), 2018, Vol 8, Issue 9, p384
- ISSN
2073-4344
- Publication type
Article
- DOI
10.3390/catal8090384