Oxidative Dehydrogenation of n‐Octane over Niobium‐Doped NiAl2O4: An Example of Beneficial Coking in Catalysis over Spinel

Farahani, Majid D.; Dasireddy, Venkata D.B.C.; Friedrich, Holger B.

doi:10.1002/cctc.201701940

Cited by 25 publications

(15 citation statements)

References 55 publications

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“…The activation of n-octane at 450 • C, using the 0.04 mol alkaline earth metal modified Ga-NaY catalysts showed the previously reported ODH products of n-octane, which were octenes, aromatics, oxygenates, cracked products and carbon oxides [1][2][3][4]. Only GHSV was varied between the catalysts to achieve iso-conversion.…”

Section: Product Selectivity At Iso-conversionsupporting

confidence: 51%

“…Oxidation, cracking, dehydrogenation, dehydrocyclization, and oxidative dehydrogenation are possible reactions that can activate paraffins using heterogeneous catalysts. Dehydrogenation (DH) of n-octane is one of the important reactions industrially and can be carried out using a variety of catalysts, both mono-and bi-functional [1][2][3][4]. Paraffins are easily and cheaply obtained from natural gas and petroleum, and this, with their relative environmental friendliness, makes them interesting alternatives to olefinic and aromatic feedstocks.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Modifying Acidity and Reducibility on the Activity of NaY Zeolite in the Oxidative Dehydrogenation of n-Octane

2020

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Non-coking stable alkaline earth metal (M = Mg, Sr, and Ba) modified Ga-NaY catalysts were prepared by ionic-exchange and tested in oxidative dehydrogenation (ODH) of n-octane using air as the source of oxygen. The role of the alkaline earth metals in NaY was to poison the acid sites while enhancing the basic sites responsible for ODH. The exception was the calcium modified NaY, which was more acidic than the parent NaY, coking and unstable under the ODH conditions used in this study. The role of gallium was to enhance the dehydrogenation pathway and improve the stability of NaY. The sequence of increasing selectivity to octenes followed the order: CaGa-NaY < Ga-NaY< MgGa-NaY < SrGa-NaY < BaGa-NaY. The highest octene selectivity obtained was 37% at iso-conversion of 6 ± 1% when BaGa-NaY was used at a temperature of 450 °C. The activity of the catalysts was directly proportional to the reducibility of the catalysts, which is in agreement with expectations.

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Section: Product Selectivity At Iso-conversionsupporting

confidence: 51%

Section: Introductionmentioning

confidence: 99%

Effects of Modifying Acidity and Reducibility on the Activity of NaY Zeolite in the Oxidative Dehydrogenation of n-Octane

2020

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“…In Nb3d spectrum the BE of Nb3d 5/2 peak is 207.2 eV, and it corresponds to Nb 5 + state. [72,73] Figure 4d presents the spectral region of Sb3d + O1s levels. Due to the fact that the more intense peak Sb3d 5/2 overlaps with the O1s line, the identification of the chemical state of antimony was carried out from Sb3d 3/2 peak position.…”

Section: Xps Studymentioning

confidence: 99%

New Multicomponent MoVSbNbCeO_x/SiO₂ Catalyst with Enhanced Catalytic Activity for Oxidative Dehydrogenation of Ethane to Ethylene

et al. 2020

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In our study, we have obtained a multicomponent MoVSbNbCeOx/SiO2 catalyst with high catalytic activity for oxidative dehydrogenation of ethane (ODE) to ethylene. To date, multicomponent MoVTe(Sb)NbOx catalysts, which have been intensively studied during the last years, were found as very promising for the ODE to produce ethylene. It was generally agreed that the MoVTeNbOx catalyst was more efficient than MoVSbNbOx. The major drawback of using Te‐containing catalysts is the presence of environmentally harmful, toxic tellurium, and its volatility during the catalyst preparation and catalytic reaction conditions. In our work, the Mo1V0.24Sb0.23Nb0.08Ce0.01Ox/50 wt. % SiO2 catalyst was prepared via the spray‐dry method of aqueous solutions of the starting components, followed by heat‐treatment in He at 350 and 600 °C. For comparative purpose, one of the best Te‐containing catalysts Mo1V0.3Te0.23Nb0.12Ox was also tested in this reaction under the similar reaction conditions. A comparison of the catalytic properties of Sb− and Te− containing catalysts at the reaction temperature of 400–450 °C illustrates for both catalysts relatively high catalytic properties for ODE. The yield of ethylene of ca. 74 % was obtained for these catalysts, which exceeds the best yield reported in literature for Sb‐containing catalysts. The two main phases – M1 and M2 were revealed by XRD in the Sb‐containing catalyst. Intergrowth between the crystals of M1 and M2 phases with the formation of the interphase boundary in the highly active and selective Sb‐containing catalyst can be proposed from HRTEM results. The nature of the active state in this catalyst is discussed.

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“…Additionally, only few articles on transition metal-doped nickel aluminates have been published until now. The Ru-doped nickel aluminate spinel was employed for carbon monoxide methanation [32], while Nb-doped NiAl 2 O 4 served as a catalyst of oxidative n-octane dehydrogenation [33]. The two other reports presented the enhancement of the NiAl 2 O 4 photocatalytic activity after its doping with copper [34], cobalt [35], zinc [35], and manganese [35].…”

Section: Introductionmentioning

confidence: 99%

Rare-Earth Metals-Doped Nickel Aluminate Spinels for Photocatalytic Degradation of Organic Pollutants

et al. 2020

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Visible-light-activated photocatalysts based on samarium-doped, europium-doped, and gadolinium-doped nickel aluminates (SmNA, EuNA, GdNA) were synthesized. The spinel crystalline structures of the doped mixed metal oxides were demonstrated by X-ray diffraction (XRD) and transmission electron microscopy (TEM) analysis. The presence of the rare-earth metals (REMs) was confirmed by the energy-dispersive X-ray (EDX) studies. Ultraviolet-visible-near-infrared (UV-Vis-NIR) spectra revealed that the REMs-doped catalysts absorb in the full solar spectrum range covering both visible and near infrared wavelengths. Scanning electron microscopy (SEM) visualized the profound morphological alterations of the doped nickel aluminate samples. Consequently, the pore volume and the Brunauer-Emmett-Teller (BET) surface area decreased, while nanoparticles sizes increased. Fourier-transform infrared spectroscopy (FTIR) exposed that surfaces of REMs-doped nickel aluminates are rich in hydroxyl groups. Finally, the photocatalytic performance was notably increased through doping nickel aluminate (NA) with REMs; the highest activity was observed for EuNA.

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Oxidative Dehydrogenation of n‐Octane over Niobium‐Doped NiAl₂O₄: An Example of Beneficial Coking in Catalysis over Spinel

Abstract: ResultsX-ray diffraction (XRD) and inductively coupled plasma optical emission spectroscopy (ICP-OES)

Cited by 25 publications

References 55 publications

Effects of Modifying Acidity and Reducibility on the Activity of NaY Zeolite in the Oxidative Dehydrogenation of n-Octane

Effects of Modifying Acidity and Reducibility on the Activity of NaY Zeolite in the Oxidative Dehydrogenation of n-Octane

New Multicomponent MoVSbNbCeO_x/SiO₂ Catalyst with Enhanced Catalytic Activity for Oxidative Dehydrogenation of Ethane to Ethylene

Rare-Earth Metals-Doped Nickel Aluminate Spinels for Photocatalytic Degradation of Organic Pollutants

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Oxidative Dehydrogenation of n‐Octane over Niobium‐Doped NiAl2O4: An Example of Beneficial Coking in Catalysis over Spinel

Abstract: ResultsX-ray diffraction (XRD) and inductively coupled plasma optical emission spectroscopy (ICP-OES)

Cited by 25 publications

References 55 publications

Effects of Modifying Acidity and Reducibility on the Activity of NaY Zeolite in the Oxidative Dehydrogenation of n-Octane

Effects of Modifying Acidity and Reducibility on the Activity of NaY Zeolite in the Oxidative Dehydrogenation of n-Octane

New Multicomponent MoVSbNbCeOx/SiO2 Catalyst with Enhanced Catalytic Activity for Oxidative Dehydrogenation of Ethane to Ethylene

Rare-Earth Metals-Doped Nickel Aluminate Spinels for Photocatalytic Degradation of Organic Pollutants

Contact Info

Product

Resources

About

Oxidative Dehydrogenation of n‐Octane over Niobium‐Doped NiAl₂O₄: An Example of Beneficial Coking in Catalysis over Spinel

New Multicomponent MoVSbNbCeO_x/SiO₂ Catalyst with Enhanced Catalytic Activity for Oxidative Dehydrogenation of Ethane to Ethylene