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NO reduction by CO over iron‐based catalysts supported by activated semi‐coke
Author(s) -
Wang Luyuan,
Cheng Xingxing,
Wang Zhiqiang,
Zhang Xingyu,
Ma Chunyuan
Publication year - 2017
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.22678
Subject(s) - catalysis , physisorption , coke , diffuse reflectance infrared fourier transform , x ray photoelectron spectroscopy , adsorption , chemistry , oxygen , activated carbon , diffuse reflection , dissociation (chemistry) , scanning electron microscope , fourier transform infrared spectroscopy , inorganic chemistry , materials science , chemical engineering , photocatalysis , organic chemistry , physics , optics , engineering , composite material
Activated semi‐coke was developed and loaded by iron species and other assistant metals (Co, La, and Ce) using a hydrothermal method to obtain the abatement of NO x emissions from power plants and then used for NO removal by CO. These catalysts were systematically characterized by N 2 physisorption, scanning electron microscopy, X‐ray diffraction, X‐ray photoelectron spectroscopy, in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), and the activity of NO x reduction. The results showed that the activated semi‐coke that was loaded by Fe species could achieve an excellent NO x conversion of 96.5 % at 350 °C with 0.2 g/g (20 wt%) of the precursor content (catalyst denoted as Fe20/ASC). This was ascribed to higher amounts of surface Fe 3+ and chemisorbed oxygen. Furthermore, Co was the best promoter among Co, La, and Ce. This enhancement was attributed to the increase of the specific surface area and chemisorbed oxygen, as well as the formation of CoFe 2 O 4 . The synergistic effect between Fe and Co species was beneficial for the formation of oxygen vacancies, which could promote the adsorption and dissociation of NO. The in situ DRIFTS results indicated that the reaction for NO x removal by CO over activated semi‐coke supported catalysts mainly occurred between coordinated nitrates/nitryls and the adsorbed CO x species.