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Experimental Evidence of the Mechanism of Selective Catalytic Reduction of NO with NH 3 over Fe-Containing BEA Zeolites.
- Source :
-
ChemSusChem [ChemSusChem] 2019 Feb 07; Vol. 12 (3), pp. 692-705. Date of Electronic Publication: 2018 Oct 17. - Publication Year :
- 2019
-
Abstract
- 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 <subscript>3</subscript> 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 <subscript>3</subscript> 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.<br /> (© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.)
Details
- Language :
- English
- ISSN :
- 1864-564X
- Volume :
- 12
- Issue :
- 3
- Database :
- MEDLINE
- Journal :
- ChemSusChem
- Publication Type :
- Academic Journal
- Accession number :
- 30328281
- Full Text :
- https://doi.org/10.1002/cssc.201801883