Ethylbenzene dehydrogenation with CO2 over Fe-doped MgAl2O4 spinel catalysts: Synergy effect between Fe2+ and Fe3+

Ji, Min; Zhang, Xiaoyan; Wang, Junhu; Park, Sang-Eon

doi:10.1016/j.molcata.2013.01.025

Cited by 37 publications

(14 citation statements)

References 35 publications

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“…1(c), which clearly indicates the orientation relationship of β -Ga 2 O 3 //(0001) Al 2 O 3 . However, it does not found obvious multilayer structure, which can be attributed to the following two factors: (1) The radii of Fe and Ga cations are close (Fe 2+ , Fe 3+ , and Ga 3+ ionic are 0.74, 0.64, and 0.62 Å, respectively232425), and the lattice parameters of Ga 2 O 3 change rarely with the Fe doping; (2) The Fe doping concentration of the Ga 2 O 3 /Fe(N) multilayer thin film is low (it is 2.44 at.% for N = 50). To investigate the composition distributions in the Ga 2 O 3 /Fe multilayer thin films, the elemental composition mapping of cross-sectional observation was obtained by the energy dispersive X-ray (EDX) measurement in TEM.…”

Section: Resultsmentioning

confidence: 95%

“…3(b) with the enlarged view of θ–2θ XRD patterns around 38°, the peaks of are located at 38.36°, 38.31°, 38.29°, 38.26°, 38.24°, and 38.19° for N = 0, 10, 20, 30, 40, and 50, respectively, indicating that the peak gradually shifts to smaller 2θ with the increase of Fe layer thickness. The lower angles shift of and higher order diffraction peaks indicates an increase of the lattice constants, which means that Fe ion has incorporated into Ga ion site and possesses a larger radius than Ga ion232425. However, for the Ga 2 O 3 /Fe(100) film, extra diffraction peaks of (110) and (113) of β phase Ga 2 O 3 appear and the diffraction intensity of the family of crystal planes decreases, featuring a polycrystalline nature.…”

Section: Resultsmentioning

confidence: 99%

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Epitaxial growth and magnetic properties of ultraviolet transparent Ga2O3/(Ga1−xFex)2O3 multilayer thin films

Guo

Cui

et al. 2016

Sci Rep

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Multilayer thin films based on the ferromagnetic and ultraviolet transparent semiconductors may be interesting because their magnetic/electronic/photonic properties can be manipulated by the high energy photons. Herein, the Ga2O3/(Ga1−xFex)2O3 multilayer epitaxial thin films were obtained by alternating depositing of wide band gap Ga2O3 layer and Fe ultrathin layer due to inter diffusion between two layers at high temperature using the laser molecular beam epitaxy technique. The multilayer films exhibits a preferred growth orientation of crystal plane, and the crystal lattice expands as Fe replaces Ga site. Fe ions with a mixed valence of Fe2+ and Fe3+ are stratified distributed in the film and exhibit obvious agglomerated areas. The multilayer films only show a sharp absorption edge at about 250 nm, indicating a high transparency for ultraviolet light. What’s more, the Ga2O3/(Ga1−xFex)2O3 multilayer epitaxial thin films also exhibits room temperature ferromagnetism deriving from the Fe doping Ga2O3.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Epitaxial growth and magnetic properties of ultraviolet transparent Ga2O3/(Ga1−xFex)2O3 multilayer thin films

Guo

Cui

et al. 2016

Sci Rep

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“…Also finally, on the third hand, this doublet can describe the Fe +3 isomorphically substituting aluminum [ 41 ] in the corresponding crystallographic positions of the MgAl 2 O 4 ‐matrix. [ 42,43 ] The second doublet (# 9, Table 4) has a significantly smaller area than the first doublet and was observed in all samples, except for FeK/S. It was characterized by high magnitude of the isomeric shift and quadrupole splitting, which is characteristic of Fe +2 in high spin state.…”

Section: Resultsmentioning

confidence: 95%

Unusual Effect of Support Carbonization on the Structure and Performance of Fe/Mgal₂o₄ Fischer–Tropsch Catalyst

et al. 2020

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Carbonization of MgAl2O4 spinel via glucose treatment is applied for preparation of spinel‐supported iron Fischer–Tropsch synthesis (FTS) catalysts. The catalysts are characterized by low‐temperature adsorption of N2, transmission electron microscopy (TEM), Mössbauer spectroscopy, in situ magnitometry, and are tested in high‐temperature FTS conditions. Surface carbonization leads to magnetite formation in the course of catalyst calcining, likely due to reductive function of surface carbon. In contrast, hematite is formed if iron precursor is deposited on pristine spinel. Support carbonization facilitates iron precursor reduction into carbide during catalyst activation step in synthesis gas flow and gives rise to highly dispersed iron nanopartilcles. Comparison of sequential and co‐impregnation approaches for support carbonization reveal that the first is preferable in terms of Hägg carbide formation during catalyst activation. Specific activity of the catalysts in high‐temperature FTS is approximately doubled due to the support carbonization. The carbonization also boosts C5+ selectivity and olefin percentage in the product hydrocarbons, while methane formation is suppressed. Adding potassium to catalyst formulation suppresses iron carbide oxidation and Fe3O4 formation, and promotes conversion of χ‐Fe5C2 into θ‐Fe7C3 in FTS conditions.

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“…The redox-type metal oxide is mainly studied as an effective catalyst for CO 2 -ODEB, − such as V-, ,− Cr-, , Fe-, − or Ce-based oxides, − whose reaction may proceed via the defective oxygen-participated Mars–van Krevelen reaction mechanism. However, the fatal drawback for these catalysts is their fast deactivation, which makes the process of CO 2 -ODEB far from being commercialized.…”

Section: Introductionmentioning

confidence: 99%

Insights into the Oxidative Dehydrogenation of Ethylbenzene with CO₂ Catalyzed by the Ordered Mesoporous V₂O₅–Ce_0.5Zr_0.5O₂–Al₂O₃

Wang

Zhu

Yang

et al. 2019

Ind. Eng. Chem. Res.

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The ordered mesoporous V2O5 (9 wt %)–Ce1–x Zr x O2 (7 wt %)–Al2O3 (VCA-x, x = 0, 0.5, and 1) was successfully synthesized by combining the hydrothermal and the modified evaporation-induced self-assembly methods. The mixed oxides were evaluated as a catalyst for the oxidative dehydrogenation of ethylbenzene with CO2 (CO2-ODEB) under industrial relevant conditions, and VCA-0.5 showed the best performance during the 50 h test. Although the coke deposition could really cover the active site, block the pore channel, and decrease the specific surface area of the catalyst, the loss of the active V with a high oxidation state was rigorously revealed as the critical cause of the catalyst deactivation. Moreover, the best performance of VCA-0.5 was well explained as the efficient stabilization of V5+ by the redox cycle of Ce3+/Ce4+. This finding is beneficial to promote the advancement of an active and stable V2O5-based catalyst for CO2-ODEB.

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Ethylbenzene dehydrogenation with CO2 over Fe-doped MgAl2O4 spinel catalysts: Synergy effect between Fe2+ and Fe3+

Cited by 37 publications

References 35 publications

Epitaxial growth and magnetic properties of ultraviolet transparent Ga2O3/(Ga1−xFex)2O3 multilayer thin films

Epitaxial growth and magnetic properties of ultraviolet transparent Ga2O3/(Ga1−xFex)2O3 multilayer thin films

Unusual Effect of Support Carbonization on the Structure and Performance of Fe/Mgal₂o₄ Fischer–Tropsch Catalyst

Insights into the Oxidative Dehydrogenation of Ethylbenzene with CO₂ Catalyzed by the Ordered Mesoporous V₂O₅–Ce_0.5Zr_0.5O₂–Al₂O₃

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Ethylbenzene dehydrogenation with CO2 over Fe-doped MgAl2O4 spinel catalysts: Synergy effect between Fe2+ and Fe3+

Cited by 37 publications

References 35 publications

Epitaxial growth and magnetic properties of ultraviolet transparent Ga2O3/(Ga1−xFex)2O3 multilayer thin films

Epitaxial growth and magnetic properties of ultraviolet transparent Ga2O3/(Ga1−xFex)2O3 multilayer thin films

Unusual Effect of Support Carbonization on the Structure and Performance of Fe/Mgal2o4 Fischer–Tropsch Catalyst

Insights into the Oxidative Dehydrogenation of Ethylbenzene with CO2 Catalyzed by the Ordered Mesoporous V2O5–Ce0.5Zr0.5O2–Al2O3

Contact Info

Product

Resources

About

Unusual Effect of Support Carbonization on the Structure and Performance of Fe/Mgal₂o₄ Fischer–Tropsch Catalyst

Insights into the Oxidative Dehydrogenation of Ethylbenzene with CO₂ Catalyzed by the Ordered Mesoporous V₂O₅–Ce_0.5Zr_0.5O₂–Al₂O₃