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An environmentally friendly FeTiSO x catalyst with a broad operation‐temperature window for the NH 3 ‐SCR of NO x
Author(s) -
Song Lei,
Ma Kui,
Tian Wen,
Ji Junyi,
Liu Changjun,
Tang Siyang,
Jiang Wei,
Yue Hairong,
Liang Bin
Publication year - 2019
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.16684
Subject(s) - catalysis , chemistry , selective catalytic reduction , redox , selectivity , coprecipitation , anatase , fourier transform infrared spectroscopy , inorganic chemistry , diffuse reflectance infrared fourier transform , reaction mechanism , hydrolysis , infrared spectroscopy , analytical chemistry (journal) , nuclear chemistry , chemical engineering , photocatalysis , organic chemistry , engineering
A novel FeTiSO x catalyst prepared by a simple hydrolysis coprecipitation method was used for the selective catalytic reduction (SCR) of NO x with NH 3 , which exhibited high catalytic activity (NO x conversion of >97% and N 2 selectivity of >95%) and tolerance for both H 2 O and SO 2 at a broad temperature window of ~325–475°C. The characterization results showed that the formation of Fe–O–Ti and Fe–O–S species could significantly enhance the acidic sites of the catalyst, which play an important role in NH 3 absorption and their catalytic activity. The Fe 3+ ions in the bulk anatase TiO 2 could significantly enhance the redox properties for the SCR reaction and suppress the side reaction of NH 3 oxidation to NO or N 2 O. In addition, the reaction mechanism was discussed based on in situ diffuse reflectance infrared Fourier transform spectroscopy measurements and kinetic investigation, indicating that the reaction was dominated by the Eley–Rideal mechanism over the FeTiSO x catalyst.