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Iron Species Present in Fe/ZSM-5 Catalysts – Influence of the Preparation Method |
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| Authors: | M. S. Batista M. A. Morales E. Baggio-Saitovich E. A. Urquieta-González |
| Affiliation: | 1. Department of Chemical Engineering, Federal University of S?o Carlos, Caixa Postal 676, CEP13565-905, S?o Carlos, SP, Brazil 2. Brazilian Center for Research in Physics, rua Dr. Xavier Sigaud 150, CBPF/DME, CEP 22290-180, Rio de Janeiro, Brazil 3. Department of Chemical Engineering, Federal University of S?o Carlos, Caixa Postal 676, CEP13565-905, S?o Carlos, SP, Brazil |
| Abstract: | The Fe species present in Fe/ZSM-5 catalysts prepared by ionic exchange in aqueous solution or in the solid state are investigated. The samples were characterized by XRD, EPR, Mössbauer Spectroscopy (MOS-S) and chemical analysis. XRD showed that the peak intensity decreased with the increase in Fe content in the samples. EPR and MOS-S showed that the Fe atoms in all the activated samples appear as Fe+3, independently of the method used in the catalyst preparation. The MOS-S data also showed that Fe/ZSM-5, prepared by ion exchange in the solid state presented lower hematite content and more Fe species in charge-compensation sites, the responsible for the catalytic activity, as confirmed by the behavior in the propane oxidation. |
| Keywords: | Fe/ZSM-5 catalyst ionic exchange M?ssbauer spectroscopy EPR |
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