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Gó,ra-Marek, Kinga,Brylewska, Kamila,Tarach, Karolina A.,Choi, Minkee The Royal Society of Chemistry 2015 Dalton Transactions Vol.44 No.17
<P>This work was attempted in order to provide a new and well-established approach for the quantification of Fe<SUP>2+</SUP> sites in zeolites. The experimental procedure was based on carbon monoxide and nitrogen monoxide sorption in Fe-exchanged ZSM-5 zeolites with different pore hierarchies, which was followed by IR spectroscopy. The values of the absorption coefficients of the respective monocarbonyl Fe<SUP>2+</SUP>(CO) and mononitrosyl Fe<SUP>2+</SUP>(NO) IR bands were obtained. In turn, the concentrations of Fe(<SMALL>II</SMALL>) moieties of various kinds were calculated and discussed with regard to the composition (Si/Al and Fe/Al ratios) of the zeolites studied.</P> <P>Graphic Abstract</P><P>This work was attempted in order to provide a new and well-established approach for the quantification of Fe<SUP>2+</SUP> sites in zeolites. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c5dt00424a'> </P>