Characterization and activity of Fe-ZSM-5 catalysts for the total oxidation of phenol in aqueous solutions

Fe-MFI zeolite was successfully synthesized using silatrane as precursor and tetrapropyl ammonium bromide as template via the sol-gel process and microwave heating technique. The effects of ageing time, heating temperature, heating time and iron concentration were investigated, and it was found that Fe-MFI synthesis favors higher heating temperatures, but is limited by the degradation of the incorporation of a template molecule. Moreover, longer ageing and heating times promote the incorporation of higher amounts of iron atom in the MFI structure. However, too long an ageing time decreases the incorporation of iron. The lower the percentage Fe loading, the greater the percentage of Fe 3+ ions incorporated into the MFI framework. The catalytic activity of Fe-MFI catalyst for the oxidation of CO was studied and it was found that these synthesized catalysts catalyzed the oxidation of CO very well.

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“…ESR results (Fig. 6) 22 From these results, it can be confirmed that both framework and extra-framework Fe appear together in the Fe-MFI samples.…”

Section: Effect Of Iron Concentrationsupporting

confidence: 53%

Synthesis of Fe‐loaded MFI zeolite using silatrane as precursor and its CO activity

Kritchayanon

Thanabodeekij

Jitkarnka

et al. 2005

Applied Organom Chemis

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“…2 together with the parent ZSM-5 zeolite used in ion exchange. All samples exhibited the typical diffractograms of the MFI framework (2u = 7-98 and 23-258) which emphasized high dispersion of Cu and Fe ions in compensating positions inside zeolites [24][25][26][27][28][29][30][31][32]. The course of the baseline indicated that no-impurity phase was observed.…”

Section: X-ray Diffraction Studiesmentioning

confidence: 99%

“…The bands at about 1100 and 445 cm À1 are due to the internal vibrations of (Si, Al) O 4 tetrahedra of ZSM-5, whereas the bands at 1225 and 800 cm À1 are due to vibrations related to external linkages between tetrahedral and hence sensitive to framework structure. The band at 550 cm À1 has been assigned to the five membered ring of the pentasil zeolite structure [22,23,25,28,33]. The band appearing at around 650 cm À1 was related to CuO vibration mode and -(Si-O-Fe) n -symmetric stretching vibration band [23,33,34].…”

Section: Ftir Measurementsmentioning

confidence: 99%

Characterization and catalytic activity of CuFeZSM-5 catalysts for oxidative degradation of Rhodamine 6G in aqueous solutions

Dükkancı

Gündüz

Yılmaz

et al. 2010

Applied Catalysis B: Environmental

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This study presents an evaluation of the catalytic performances of Fe and Cu containing ZSM-5 zeolites for oxidation of Rhodamine 6G. Fe and Cu were loaded by ion exchange or through hydrothermal synthesis. The catalytic process was carried out in an aqueous solution using H2O2 as an oxidant. The catalyst prepared by hydrothermal synthesis showed the highest activity (100% decolorization, 59.1% aromatic degradation and 51.8% TOC removal at initial pH of 3.5). This catalyst was stable against leaching even at low pH. The change in activity of the catalysts prepared was attributed to incorporation of the Fe and Cu species with ZSM-5. Fe and Cu were in structural locations - in the framework - in the catalyst prepared by hydrothermal synthesis while there were extraframework cations or species in catalysts prepared by ion exchange. Incoporation of Cu into FeZSM-5 increased its catalytic activity. © 2010 Elsevier B.V. All rights reserved.TÜBİTAK and NASU project number 107M62

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“…Iron and copper containing zeolites show redox properties because these metals can change their oxidation states [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Recently, high catalytic activity of iron containing zeolites for phenol oxidation [15,16] and for degradation of dyes [2,3] has been reported. Supported Fe-saponite clay catalysts revealed to be quite active in the Fenton-like oxidation of Orange II [4].…”

Section: Introductionmentioning

confidence: 99%

Heterogeneous Fenton-like degradation of Rhodamine 6G in water using CuFeZSM-5 zeolite catalyst prepared by hydrothermal synthesis

Dükkancı

Gündüz

Yılmaz

et al. 2010

Journal of Hazardous Materials

165

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a b s t r a c tIn this study, heterogeneous Fenton-like degradation of reactive azo dye Rhodamine 6G in water was investigated over a CuFeZSM-5 zeolite catalyst prepared by hydrothermal synthesis. At initial pH of 3.4, a color removal of 100% was achieved after a reaction time of 45 min. TOC elimination was measured to be 51.8% after 2 h of oxidation. Initial decolorization rate was described by an equation of −r A0 = 4.56 × 10 2 e −24.83/RT C R6G,0 C 0.35 H 2 O 2 ,0 where R is in kJ/mol. The leaching of iron and copper cations from zeolite structure into the solution during oxidation was dependent on pH strongly. The regulation of pH from 6.5 (dye solution pH) to 3.4, increased leaching for iron from 0.7 to 0.8 mg/dm 3 and for copper from 1.4 to 2.1 mg/dm 3 . The copper was totally leached from the catalyst during the process at pH 3.4.

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Characterization and activity of Fe-ZSM-5 catalysts for the total oxidation of phenol in aqueous solutions

Cited by 73 publications

References 15 publications

Synthesis of Fe‐loaded MFI zeolite using silatrane as precursor and its CO activity

Synthesis of Fe‐loaded MFI zeolite using silatrane as precursor and its CO activity

Characterization and catalytic activity of CuFeZSM-5 catalysts for oxidative degradation of Rhodamine 6G in aqueous solutions

Heterogeneous Fenton-like degradation of Rhodamine 6G in water using CuFeZSM-5 zeolite catalyst prepared by hydrothermal synthesis

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