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Enhanced low‐temperature Selective Catalytic Reduction (SCR) of NO x by CuO‐CeO 2 ‐MnO x /γ‐Al 2 O 3 mixed oxide catalysts
Author(s) -
Sun Jiaxing,
Chen Heng,
Wu Hao,
Zhou Changsong,
Yang Hongmin
Publication year - 2019
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.23483
Subject(s) - catalysis , selective catalytic reduction , scanning electron microscope , bet theory , oxide , flue gas , temperature programmed reduction , specific surface area , copper oxide , atmospheric temperature range , nox , materials science , space velocity , analytical chemistry (journal) , chemical engineering , chemistry , inorganic chemistry , selectivity , metallurgy , composite material , combustion , chromatography , organic chemistry , engineering , physics , meteorology
A series of CuO‐MnO x ‐CeO 2 /γ‐Al 2 O 3 catalysts in different ratios were synthesized by a sol‐gel method with the purpose of improving the low‐temperature denitration performance (loading a transition mental oxide (MnO x , CeO 2 ) on a CuO/γ‐Al 2 O 3 copper‐based catalyst). The denitration performance of a low‐temperature SCR under the condition of simulated flue gas was measured using the programmed heating method in the catalytic reaction efficiency evaluation system. The denitration efficiency of the 6 % CuO‐5 % MnO x ‐10 % CeO 2 /γ‐Al 2 O 3 catalytic particles was maintained at over 80 % within a temperature range of 100–200 °C. The catalysts were characterized by surface area analysis (BET), x‐ray diffraction (XRD), and scanning electron microscopy (SEM). The best surface structure characteristics include the 5 % MnO x + 10 % CeO 2 loading capacity of the catalyst, which was indicated by a BET analysis. The catalyst surface structure characteristics were effectively promoted by the amount of CeO 2 and MnO 2 loading proved by the SEM analysis. The possible mechanisms involved in SCR denitration at a low temperature were also discussed. The experimental results revealed that the catalyst granule with perfect surface characteristics and pore features was successfully synthesized by the sol‐gel method. The denitration performances were restrained by 10 % of H 2 O and 800 mg · m −3 of SO 2 , indicating that SO 2 and H 2 O have an inhibiting effect on NO x conversion.