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Experimental Evidence of the Mechanism of Selective Catalytic Reduction of NO with NH 3 over Fe‐Containing BEA Zeolites
Author(s) -
Boroń Paweł,
Rutkowska Małgorzata,
Gil Barbara,
Marszałek Bartosz,
Chmielarz Lucjan,
Dzwigaj Stanislaw
Publication year - 2019
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201801883
Subject(s) - catalysis , zeolite , chemistry , selective catalytic reduction , inorganic chemistry , adsorption , ion exchange , ammonia , ammonia production , reaction mechanism , selective reduction , fourier transform infrared spectroscopy , ion , chemical engineering , organic chemistry , engineering
Various temperature‐programmed techniques were used as tools in mechanistic studies of selective catalytic reduction (SCR) of NO with ammonia in the presence of Fe‐containing BEA zeolites. Moreover, FTIR studies of adsorbed NH 3 and NO were conducted to determine the interactions of reactants with the catalyst surface. Iron was introduced into BEA zeolite by three different methods: i) two‐step post‐synthesis; ii) conventional wet impregnation; iii) ion exchange. The catalytic activity was dependent on the method used for iron introduction. The reactivities of NH 3 and NO adsorbed on iron‐modified zeolites obtained by impregnation and ion‐exchange methods were higher than those measured for the catalyst obtained by a two‐step post‐synthesis method. The activity of Fe‐containing zeolites in SCR was related to the form of deposited iron species, as well as to the nature, strength, and concentration of acid sites. Possible reaction pathways of NO reduction over the FeBEA zeolite catalysts were presented and discussed.