Oxidative dehydrogenation of ethylbenzene to styrene over the CoFe2O4–MCM-41 catalyst: preferential adsorption on the O2−Fe3+O2− sites located at octahedral positions

Soares, Moisés da Costa Borges; Barbosa, Felipe Fernandes; Morales, Marco A.; Valentini, Antoninho; Albuquerque, Anderson R.; Pergher, Sibele Berenice Castellã; Essayem, N.; Braga, Tiago Pinheiro

doi:10.1039/c9cy00618d

Cited by 28 publications

(9 citation statements)

References 70 publications

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“…The previous studies have reported the ethylbenzene dehydrogenation mechanism. , In this case, we proposed a CL-ODH reaction pathway for ethylbenzene conversion (Scheme ). First, ethylbenzene was adsorbed to the Mn 4+ active site by hemolytic cleavage.…”

Section: Resultsmentioning

confidence: 93%

Lattice Oxygen Regulation of Perovskites for Chemical Looping Oxidative Dehydrogenation of Ethylbenzene to Styrene

Wang

Zhang

et al. 2023

ACS Sustainable Chem. Eng.

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The direct dehydrogenation process produces over 90% of global styrene. However, it is hampered by high energy consumption due to equilibrium limitation, a high steam/ethylbenzene feeding ratio, and complicated separation procedures. In this study, we propose the synthesis of a novel perovskitestructured metal oxide as the redox catalyst for chemical looping oxidative dehydrogenation (CL-ODH) of ethylbenzene into styrene. Lower ethylbenzene activation temperature and higher oxygen storage capacity contributing to high ethylbenzene conversion are achieved by Mn doping of the B site in SrFeO 3−δ , and styrene yield is further enhanced by Ba doping of the A site. The optimized Sr 0.8 Ba 0.2 Fe 0.2 Mn 0.8 O 3−δ catalyst exhibits favorable dehydrogenation activity but is deactivated in the first five redox cycles due to the severe carbonation and perovskite structure decomposition. The decarbonization treatment on the catalyst at 950 °C in an O 2 atmosphere restores the perovskite structure and dehydrogenation activity, resulting in 85% ethylbenzene conversion and 89% styrene selectivity at 550 °C. Ethylbenzene on the catalyst undergoes full combustion via adsorbed oxygen, ODH of ethylbenzene into styrene and H 2 O using lattice oxygen, and direct dehydrogenation without available lattice oxygen. The proposed redox catalyst demonstrates efficient conversion of ethylbenzene into styrene, showing great potential for the energy conservation and process intensification of styrene production.

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Section: Resultsmentioning

confidence: 93%

Lattice Oxygen Regulation of Perovskites for Chemical Looping Oxidative Dehydrogenation of Ethylbenzene to Styrene

Wang

Zhang

et al. 2023

ACS Sustainable Chem. Eng.

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“…It is worth mentioning that surface electrostatic potential maps have been extensively studied to assess the acidity of metallic oxides by visualizing the surface charge distribution, which is related to the change of colors concerning more positive (blue) or negative regions (red). 68,69 Thus, Fig. 12b presents the electron density for the Al 2 O 3 phase (001).…”

Section: Resultsmentioning

confidence: 99%

Catalytic dehydration of glycerol over Cu–Fe–Al-based oxides: understanding changes in active sites throughout the reaction

Barbosa,

Tavares,

Albuquerque

et al. 2023

RSC Adv.

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“…Utilizing Néel law, K eff = 25 k B T B / V m , the magnetic anisotropy constant ( K eff ) was calculated for all nanoferrites, where k B is Boltzmann’s constant (1.3807 × 10 –23 J/K) and V m is the volume of a single nanocrystal assuming sphere as V m = π D m 3 /6 ( D m is the magnetic core diameter from TEM). , For all nanoferrites, there is a peak in the ZFC measurements, indicating a blocking behavior, with the blocking temperature T B well below room temperature (300 K). FC/ZFC curves converged at temperatures higher than the blocking temperatures ( T > T B ).…”

Section: Resultsmentioning

confidence: 99%

Improvements in the Organic-Phase Hydrothermal Synthesis of Monodisperse M_xFe_3–xO₄ (M = Fe, Mg, Zn) Spinel Nanoferrites for Magnetic Fluid Hyperthermia Application

Etemadi

Plieger

2020

ACS Omega

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In the quest for optimal heat dissipaters for magnetic fluid hyperthermia applications, monodisperse M x Fe 3– x O 4 (M = Fe, Mg, Zn) spinel nanoferrites were successfully synthesized through a modified organic-phase hydrothermal route. The chemical composition effect on the size, crystallinity, saturation magnetization, magnetic anisotropy, and heating potential of prepared nanoferrites were assessed using transmission electron microscopy (TEM), dynamic light scattering, X-ray diffraction (XRD), thermogravimetric analysis (TGA), energy-dispersive X-ray spectroscopy (EDS), atomic absorption spectroscopy (AAS), X-ray photoelectron spectroscopy (XPS), and vibrating sample magnetometer (VSM) techniques. TEM revealed that a particle diameter between 6 and 14 nm could be controlled by varying the surfactant ratio and doping ions. EDS, AAS, XRD, and XPS confirmed the inclusion of Zn and Mg ions in the Fe 3 O 4 structure. Magnetization studies via VSM revealed both the superparamagnetic nature of the nanoferrites and the dependence on substitution of the doped ions to the final magnetization. The broader zero-field cooling curve of Zn-doped Fe 3 O 4 was related to their large size distribution. Finally, a maximum rising temperature ( T max ) of 66 °C was achieved for an aqueous ferrofluid of nondoped Fe 3 O 4 nanoparticles after magnetic field activation for 12 min.

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Oxidative dehydrogenation of ethylbenzene to styrene over the CoFe₂O₄–MCM-41 catalyst: preferential adsorption on the O²⁻Fe³⁺O²⁻ sites located at octahedral positions

Abstract: The present study describes the catalytic performance of cobalt ferrite supported on MCM-41 for the oxidative dehydrogenation of ethylbenzene.

Cited by 28 publications

References 70 publications

Lattice Oxygen Regulation of Perovskites for Chemical Looping Oxidative Dehydrogenation of Ethylbenzene to Styrene

Lattice Oxygen Regulation of Perovskites for Chemical Looping Oxidative Dehydrogenation of Ethylbenzene to Styrene

Catalytic dehydration of glycerol over Cu–Fe–Al-based oxides: understanding changes in active sites throughout the reaction

Improvements in the Organic-Phase Hydrothermal Synthesis of Monodisperse M_xFe_3–xO₄ (M = Fe, Mg, Zn) Spinel Nanoferrites for Magnetic Fluid Hyperthermia Application

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Oxidative dehydrogenation of ethylbenzene to styrene over the CoFe2O4–MCM-41 catalyst: preferential adsorption on the O2−Fe3+O2− sites located at octahedral positions

Abstract: The present study describes the catalytic performance of cobalt ferrite supported on MCM-41 for the oxidative dehydrogenation of ethylbenzene.

Cited by 28 publications

References 70 publications

Lattice Oxygen Regulation of Perovskites for Chemical Looping Oxidative Dehydrogenation of Ethylbenzene to Styrene

Lattice Oxygen Regulation of Perovskites for Chemical Looping Oxidative Dehydrogenation of Ethylbenzene to Styrene

Catalytic dehydration of glycerol over Cu–Fe–Al-based oxides: understanding changes in active sites throughout the reaction

Improvements in the Organic-Phase Hydrothermal Synthesis of Monodisperse MxFe3–xO4 (M = Fe, Mg, Zn) Spinel Nanoferrites for Magnetic Fluid Hyperthermia Application

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Oxidative dehydrogenation of ethylbenzene to styrene over the CoFe₂O₄–MCM-41 catalyst: preferential adsorption on the O²⁻Fe³⁺O²⁻ sites located at octahedral positions

Improvements in the Organic-Phase Hydrothermal Synthesis of Monodisperse M_xFe_3–xO₄ (M = Fe, Mg, Zn) Spinel Nanoferrites for Magnetic Fluid Hyperthermia Application