Catalysis Today, Vol.169, No.1, 16-23, 2011
Characterization of iron cationic sites in ferrierite using Mossbauer spectroscopy
Iron ferrierites with low iron content and well-defined cation occupation supported by FTIR, UV-vis and EPR analysis, were utilized in order to settle the Mssbauer parameters of individual iron cationic species. These samples thus could serve as standard for establishing parameters for the Mssbauer spectroscopy analysis. In accordance with the analysis and supported by the published DFT modeling iron ions were present in three types of cationic sites (one alpha and two beta). For the first time, experimental evidence supporting the proposed existence of two types of beta sites for Fe(II) bonding has been presented. Fe(II) in two types of beta sites were characterized by IS = 0.92mm/s and QS = 0.44 mm/s, and IS = of 0.94mm/s and QS = 0.70 mm/s. The Mossbauer parameters of the Fe(II) in alpha sites has been established with IS = 1.02mm/s and QS = 2.02 mm/s. (C) 2010 Published by Elsevier B.V.