Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1521133 | Materials Chemistry and Physics | 2015 | 7 Pages |
Abstract
The incorporation of Fe3+ ions in the framework of FDU-5, a cubic Ia3d silicate, with different Si/Fe ratio have been synthesized for the first time in room temperature under acidic condition employing solvent drying method without the necessity of pH adjustments. The synthesized samples, Fe-FDU-5, were investigated using different characterization techniques including XRD, N2 sorption, TEM, UV-vis, ESR, NH3-TPD, H2-TPR and pyridine-absorbed FT-IR techniques. The presence of isolated Fe3+ species and extraframework Fe2O3 particles were confirmed at all loadings (1.2-4.5Â wt% Fe). The N2 sorption studies of Fe-FDU-5 materials evidenced a specific surface area of 340-394Â m2/g, total pore volume of 0.41-0.44Â cm3/g and a narrow pore distribution of 4.4-4.9Â nm. Fe-FDU-5 are excellent catalysts for benzylation of benzene and is independent of acid sites. A near complete conversion of benzyl chloride (BnCl) was achieved in 20Â min over Fe-FDU-5 where as other metal ions including Al3+, Sn4+ and Mn2+or Mn3+ supported on various silica supports yielded only 3-8% BnCl conversion. Moreover, both framework Fe3+ and extraframework octahedral Fe species are found beneficial for this reaction, however, bulk Fe2O3 species are inactive.
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Electronic, Optical and Magnetic Materials
Authors
Vinju V. Srinivasan, Gaffar Imran, Rajamanickam Maheswari,