ChemInform Abstract: In Situ Mössbauer Spectroscopic Characterization of Fe/Al2O3 and Fe/ThO2 Fischer‐Tropsch Catalysts.

Vaishnava, P. P.; Ktorides, Petros I.; Montano, P. A.; Mbadcam, Ketcha Joseph; Melson, Gordon A.

doi:10.1002/chin.198612018

Cited by 2 publications

(2 citation statements)

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“…However, no Fe z+ in octahedral vacancy was found. Some researchers [2,8] have reported that Fe z+ in tetrahedral and octahedral vacancy were found in the reduction processes for Fe/)t-Al203 catalysts, and this revealed a difference from the Fe/y-AlzO3 in our case.…”

Section: Tpr Spectra Studiescontrasting

confidence: 65%

A study on the reduction behavior of silica supported iron and platinum-iron catalysts

Jia

Shen

Lin

et al. 1998

React Kinet Catal Lett

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The reduction behavior of silica supported iron and platinum-iron catalysts were studied by combined in situ temperature programmed reduction (TPR)-Mtssbauer Spectroscopy 0VIBS). The results indicated that the TPR profiles of the supported Fe catalysts were different fi'om that ofbttlk cc-Fe203. There existed an interaction between the Pt and Fe metals and the SiO2 support for the Pt-Fe/SiO2 catalyst. On the supported iron-containing catalysts, the Fe 3+ species were highly dispersed on the SiO2 support before reduction. No Fe ~ and Fe 2+ in octahedral vacancy were found in the reduction of SiO2 supported iron-containing catalysts. Addition of Pt to the Fe/SiO2 catalyst could promote the reduction of the iron species.

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Section: Tpr Spectra Studiescontrasting

confidence: 65%

A study on the reduction behavior of silica supported iron and platinum-iron catalysts

Jia

Shen

Lin

et al. 1998

React Kinet Catal Lett

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“…In the case of LF5A-700 (Figure 4b, Table 2), the only doublet was again assigned to α-Fe 2 O 3 with a superparamagnetic state, which is probably due to its small crystalline size (about 5 nm) or the dissolution of hematite in alumina. 65,66 For LF5A-900, a magnetic hyperfine field distribution (49%) associated with increased α-Fe 2 O 3 crystallites was detected in the spectrum, resulting from the increasing Fe concentration (x = 5). In addition, a broadened doublet (8%) was also observed in the fitted spectrum.…”

Section: Resultsmentioning

confidence: 98%

Characterization of Fe Substitution into La-Hexaaluminate Systems and the Effect on N₂O Catalytic Decomposition

et al. 2014

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Compared to Ba-hexaaluminates with β-Al 2 O 3 structure, La-hexaaluminates with magnetoplumbite (MP) structure have more substituted Al sites in the preferentially exposed mirror plane, which should favor N 2 O decomposition. In this regard, LaFe x Al 12−x O 19 catalysts with x = 1 and 5 were herein prepared using the coprecipitation method. 57 Fe Mossbauer spectroscopy and X-ray diffraction structure refinements revealed that Fe 3+ ions originating in Fe 2 O 3 species mainly entered tetrahedral Al(2) and trigonal bipyramidal Al(5) sites. Meanwhile, Fe 3+ ions in octahedral sites of perovskite-type LaFeO 3 intermediates preferentially accommodated in octahedral Al(3) sites in the mirror plane of La-hexaaluminates. Correlation of normalized rates (moles of N 2 O per hour per square meter) of the catalysts at 500 °C with the occupancy of Fe ions in different Al crystallographic sites of the MP phase indicated that Fe 3+ ions in the Al(3) and Al(5) sites were highly active for N 2 O decomposition. In contrast, Fe 2+ derived from a Fe 3+ → Fe 2+ reduction under high-temperature calcination played a negative role.

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ChemInform Abstract: In Situ Mössbauer Spectroscopic Characterization of Fe/Al₂O₃ and Fe/ThO₂ Fischer‐Tropsch Catalysts.

Abstract: Mössbauer spectroscopy has been used to study in situ the transformation of the title catalysts under different stages of calcination, reduction, carbu?zation, and Fischer‐Tropsch reactions.

Cited by 2 publications

References 1 publication

A study on the reduction behavior of silica supported iron and platinum-iron catalysts

A study on the reduction behavior of silica supported iron and platinum-iron catalysts

Characterization of Fe Substitution into La-Hexaaluminate Systems and the Effect on N₂O Catalytic Decomposition

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ChemInform Abstract: In Situ Mössbauer Spectroscopic Characterization of Fe/Al2O3 and Fe/ThO2 Fischer‐Tropsch Catalysts.

Abstract: Mössbauer spectroscopy has been used to study in situ the transformation of the title catalysts under different stages of calcination, reduction, carbu?zation, and Fischer‐Tropsch reactions.

Cited by 2 publications

References 1 publication

A study on the reduction behavior of silica supported iron and platinum-iron catalysts

A study on the reduction behavior of silica supported iron and platinum-iron catalysts

Characterization of Fe Substitution into La-Hexaaluminate Systems and the Effect on N2O Catalytic Decomposition

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Product

Resources

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ChemInform Abstract: In Situ Mössbauer Spectroscopic Characterization of Fe/Al₂O₃ and Fe/ThO₂ Fischer‐Tropsch Catalysts.

Characterization of Fe Substitution into La-Hexaaluminate Systems and the Effect on N₂O Catalytic Decomposition