Mössbauer spectroscopic study of iron phosphate catalysts used in selective oxidation

Millet, J.M.M.; Virely, Christine; Forissier, M.; Bussiere, P.; Védrine, J.C.

doi:10.1007/bf02398251

Cited by 49 publications

(18 citation statements)

References 5 publications

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“…As reported in the literature, 35,36 the rst step in the reduction occurs above the temperatures of 500 C. The use of CH 4 as reductant in this study accelerated the reduction, probably due to the activation and spill over of hydrogen from the metal centers to the iron phosphate.…”

Section: Partial Oxidation Of Methanesupporting

confidence: 77%

The effect of oxidant species on direct, non-syngas conversion of methane to methanol over an FePO₄ catalyst material

et al. 2019

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Section: Partial Oxidation Of Methanesupporting

confidence: 77%

The effect of oxidant species on direct, non-syngas conversion of methane to methanol over an FePO₄ catalyst material

et al. 2019

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“…The lower IS is about 0.326 mm s À1 at 300 K which in the experimental error range is close to the value 0.31 mm s À1 , which was previously reported for tetrahedral coordinated iron embedded in a-FePO 4 . 39 The higher IS component can be assigned to iron in a higher coordination like fivefold, which is predicted by the proposed model. It is also worth mentioning that the distribution of IV Fe 3+ hyperfine interaction parameters is narrower than the distribution of V Fe 3+ , which suggests a higher order of the tetrahedral Fe 3+ surroundings.…”

Section: Mössbauer Spectroscopymentioning

confidence: 55%

Structural properties of iron-phosphate glasses: spectroscopic studies and ab initio simulations

Stoch

Szczerba

Bodnar

et al. 2014

Phys. Chem. Chem. Phys.

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Vitrification is the most effective method for the immobilization of hazardous waste by incorporating toxic elements into a glass structure. Iron phosphate glasses are presently being considered as matrices for the storage of radioactive waste, even of those which cannot be vitrified using conventional borosilicate waste glass. In this study, a structural model of 60P2O5-40Fe2O3 glass is proposed. The model is based on the crystal structure of FePO4 which is composed of [FeO4][PO4] tetrahedral rings. The rings are optimized using the DFT method and the obtained theoretical FTIR and Raman spectra are being compared with their experimental counterparts. Moreover, the proposed model is in very good agreement with X-ray absorption fine structure spectroscopy (XANES/EXAFS) and Mössbauer spectroscopy measurements. According to the calculations the Fe(3+) is in tetrahedral and five-fold coordination. The maximal predicted load of waste constituents into the glass without rebuilding of the structure is 30 mol%. Below this content, waste constituents balance the charge of [FeO4](-) tetrahedra which leads to their strong bonding to the glass resulting in an increase of the chemical durability, transformation and melting temperatures and density.

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“…Mössbauer spectroscopy : The Mössbauer spectrometer was a homemade apparatus using a 2 GBq 57 Co/Rh γ‐ray source and a conventional constant acceleration Mössbauer spectrometer . The solid samples were diluted in sucrose at about 50 wt % concentration and pressed into discs.…”

Section: Methodsmentioning

confidence: 99%

Structural Changes of Binary/Ternary Spinel Oxides During Ethanol Anaerobic Decomposition

et al. 2017

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Several M‐modified iron oxides of the spinel family have proven to be effective electron and O2− vectors for the production of hydrogen in the chemical‐loop reforming of bio‐alcohols. The present work is specifically focused on investigation of ethanol anaerobic decomposition over spinel oxides, which results in significant structural changes of the oxygen carrier material itself and corresponds to a first step of the chemical‐loop reforming process. In particular, a series of binary/ternary M‐modified ferrospinels were prepared by a co‐precipitation method and tested in terms of both redox properties and intrinsic catalytic activity in addition to a complex ex situ study that encompasses the solid‐state chemistry investigations of the fresh and reduced oxygen carrier materials. It was found that Co/Cu incorporation facilitates total/partial oxidation of ethanol, giving rise to high yields of H2, COx, and H2O; whereas Mn incorporation predominantly favored dehydrogenation and condensation reactions, leading to the formation of acetaldehyde and acetone. In addition, the incorporation of Mn contributed to significantly reduce the amount of coke formed; however, it caused a lower intrinsic reducibility, which was explained by the formation of a thermodynamically stable and hardly reducible layer of MnxFeyO solid solution.

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Mössbauer spectroscopic study of iron phosphate catalysts used in selective oxidation

Cited by 49 publications

References 5 publications

The effect of oxidant species on direct, non-syngas conversion of methane to methanol over an FePO₄ catalyst material

The effect of oxidant species on direct, non-syngas conversion of methane to methanol over an FePO₄ catalyst material

Structural properties of iron-phosphate glasses: spectroscopic studies and ab initio simulations

Structural Changes of Binary/Ternary Spinel Oxides During Ethanol Anaerobic Decomposition

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Mössbauer spectroscopic study of iron phosphate catalysts used in selective oxidation

Cited by 49 publications

References 5 publications

The effect of oxidant species on direct, non-syngas conversion of methane to methanol over an FePO4 catalyst material

The effect of oxidant species on direct, non-syngas conversion of methane to methanol over an FePO4 catalyst material

Structural properties of iron-phosphate glasses: spectroscopic studies and ab initio simulations

Structural Changes of Binary/Ternary Spinel Oxides During Ethanol Anaerobic Decomposition

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Product

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The effect of oxidant species on direct, non-syngas conversion of methane to methanol over an FePO₄ catalyst material

The effect of oxidant species on direct, non-syngas conversion of methane to methanol over an FePO₄ catalyst material