Iron-containing zeolites as catalysts of the profound oxidation of propylene

Skalkina, L. V.; Kolchin, I. K.; Margolis, L. Ya.; Ermolenko, N. F.; Levina, S. A.; Malashevich, L. N.

doi:10.1007/bf01084290

Cited by 1 publication

(1 citation statement)

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“…Fe(III) ions exist in several zeolites and have been found to be active for the catalysis of certain selective oxidation processes [16][17][18]. Fe(III) incorporated into MCM-41 mesoporous materials are also catalysts for the liquid phase oxidation of cyclohexane into cyclohexanone and cyclohexanol with aqueous H 2 O2 or tert-butyl hydroperoxide as oxidants [3,4].…”

Section: Introductionmentioning

confidence: 99%

Electron spin resonance and electron spin echo modulation studies of Fe-containing mesoporous MCM-48 molecular sieves

Kevan

2001

Appl. Magn. Reson.

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Through electron spin resonance (ESR) and electron spin echo modulation (ESEM) studies, three Fe(III) species are found in liquid ion-exchanged Fe-MCM-48 and synthesized FeMCM-48. Species A with ESR parameters gA = 4.30 with a line width of 160 G is observed in hydrated samples. This species is accompanied by a shoulder at g = 7.60 and is assigned to distorted tetrahedral Fe(III) likely located at framework defect sites. Species B is a broad peak centered at ga = 2.00 and is assigned to distorted octahedral Fe(III) located at extraframework sites. This species is also observed in dehydrated samples. Species C is a very narrow isotropic signal at gC = 4.30 with a line width of 30 G and is only observed in synthesized mesophase materials. It is consistent with rhombic Fe(III) with zero field parameters D and E corresponding to DIE = 1/3 and is assigned to tetrahedral Fe(III) located at framework sites. Framework Fe(III) in FeMCM-48 is less accessible to ND 3 than is extraframework Fe(III) in Fe-MCM-48. On the basis of deuterium ESEM data, framework Fe(III) in synthesized FeMCM-48 directly coordinates to two D 2 0 or CH3OD molecules and interacts more weakly with two more molecules. However, no deuterium ESEM is observed for extraframework Fe(III) in ion-exchanged Fe-MCM-48 with adsorbed D20 or CH 2 OD. It is also found that Fe(III) is incorporated into the framework of FeMCM-48 at an early stage of the formation of the MCM-48 mesostructure.

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Section: Introductionmentioning

confidence: 99%

Electron spin resonance and electron spin echo modulation studies of Fe-containing mesoporous MCM-48 molecular sieves

Kevan

2001

Appl. Magn. Reson.

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Iron-containing zeolites as catalysts of the profound oxidation of propylene

Cited by 1 publication

References 7 publications

Electron spin resonance and electron spin echo modulation studies of Fe-containing mesoporous MCM-48 molecular sieves

Electron spin resonance and electron spin echo modulation studies of Fe-containing mesoporous MCM-48 molecular sieves

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