Synthesis of iron substituted zeolite with Na-P1 framework
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Zeolites with substitution by transition metals are expected to have unique catalytic properties in addition to common cation exchange abilities, but studies on the synthesis of iron-substituted zeolites with a greater cation exchange capacity (CEC) are very few. We hydrothermally synthesized iron-substituted Na-P1 type zeolites having CEC values of >300 cmolc kg−1 with iron content of up to 90 cmolc kg−1 with changing the addition of iron. Most of the iron in the products was concluded to be incorporated into the structure of Na-P1 by substituting aluminum, because measured CEC value and the content of sodium (exchangeable cation) nearly coincided with the sum of aluminum and iron contents in each product. In addition, UV–Visible diffuse reflectance spectra of the products revealed characteristic bands of isolated tetrahedral iron species and Fourier Transform Infrared spectroscopy (FT-IR) results indicated the existence of Si-O-Fe bonds in the products. These results confirmed the substitution of iron in the framework of Na-P1 by a hydrothermal synthesis in a short time.
KeywordsZeolite Na-P1 Iron Substitution Synthesis
We thank Associate Professor Dr. Satoshi Mitsunobu for providing of the iron oxides and Mr. Takeshi Kiyoi at the Division of Analytical Bio-medicine the Advanced Research Support Center, Ehime University for his technical assistance of SEM observation. Additionally this study was supported by Ehime Institute of Industrial Technology for using UV–Visible spectroscopy.
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