Experimental Evidence of the Mechanism of Selective Catalytic Reduction of NO with NH3 over Fe‐Containing BEA Zeolites. Issue 3 (17th October 2018)

• Record Type: Journal Article
• Authors: Boroń, Paweł; Rutkowska, Małgorzata; Gil, Barbara; Marszałek, Bartosz; Chmielarz, Lucjan; Dzwigaj, Stanislaw
• Is Part Of: ChemSusChem. Volume 12:Issue 3(2019)
• Page Start: 692
• Page End: 705
• Publication Date: 2018-10-17
• Subjects: deNOx -- heterogeneous catalysis -- iron -- reaction mechanisms -- zeolites; Green chemistry -- Periodicals; Sustainable engineering -- Periodicals; Chemistry -- Periodicals; Chemical engineering -- Periodicals; 660
• DOI: 10.1002/cssc.201801883
• Languages: English
• ISSNs: 1864-5631

Abstract

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 NH3 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 NH3 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. Abstract : BEA here now : Iron introduced to BEA zeolite in various forms gave rise to different catalytic activities in the deNOx process. The interactions of NH3 and NO molecules with iron species, as well as reactivity of adsorbed reactants and possible reaction mechanisms, were analyzed by temperature‐programmed methods and FTIR spectroscopy.