SYNTHESIS AND PHYSICOCHEMICAL CHARACTERIZATION OF ZSM-5 METALLOSILICATE ZEOLITES PREPARED BY ISOMORPHOUS SUBSTITUTION PROCESS | ||
| Al-Azhar Bulletin of Science | ||
| Article 17, Volume 2007, Issue 12, December 2007, Pages 203-220 PDF (483.44 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/absb.2007.11143 | ||
| Author | ||
| TAREK M. SALAMA* | ||
| Faculty of Science, Chemistry Department, Al-Azhar University, Nasr City 11884, Cairo, Egypt. | ||
| Abstract | ||
| Metal ions-containing ZSM-5 materials were prepared by isomrphous substitution of purely ZSM-5 using different metal ions, namely Co(II), Ni(II) and Cu(II). The metal modified ZSM-5 samples were synthesized hydrothermally in the presence of tetrapropyl ammonium bromide (TPABr) as the template and n-propyl amine (n-PrNH2) as the mobilizing agent. The structure, morphology, particle-size distribution, surface texture and acidity of these materials have been investigated and compared with ZSM-5 prepared by direct hydrothermal synthesis. The apparent effect of the substitution of Al by Co(II) ions on the crystal size results in a structural arrangement of the gel during aging-favoring nucleation.Thesurfacearea, degree of crystallinity and particle size of Co/ZSM-5 increase at the expense of pore radius, though Ni(II) and Cu(II) ions substituted ZSM-5 cause lesser effects. The M/ZSM-5 catalyst in the presence H2O2/UV is an active system for the oxidative color removal of Direct blue-1 in aqueous heterogeneous suspensions with a very low M(II)/substrate ratio. The high phase heterogeneity of Co/ZSM-5 catalyst account for the increased values of the activity than the corresponding Ni/ and Cu/ZSM-5 ones. | ||
| Keywords | ||
| ZSM-5; Isomorphous substitution; In-situ FT-IR; Surface texture; particle-size distribution; XRD; photocatalysis | ||
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