0000000000201624

AUTHOR

Alfonso Caballero

showing 2 related works from this author

Redox and Catalytic Properties of Promoted NiO Catalysts for the Oxidative Dehydrogenation of Ethane

2017

[EN] NiO and metal-promoted NiO catalysts (M-NiO, with a M/(M+Ni) atomic ratio of 0.08, with M = Nb, Sn, or La) have been prepared, tested in the oxidative dehydrogenation (ODH) of ethane, and characterized by means of XRD, TPR, HRTEM, Raman, XPS, and in situ XAS (using H-2/He, air or C2H6/He mixtures). The selectivity to ethylene during the ODH of ethane decreases according to the following trend: Nb NiO Sn NiO > La NiO > NiO, whereas the catalyst reducibility (determined by both TPR and XAS using H-2/He mixtures) shows the opposite trend. However, different reducibility and catalytic behavior in the absence of oxygen (ethane/He mixtures) have been observed, especially when comparing Nb- a…

X-ray absorption spectroscopyEthyleneInorganic chemistryNon-blocking I/O02 engineering and technology010402 general chemistry021001 nanoscience & nanotechnology01 natural sciencesRedox0104 chemical sciencesSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsCatalysischemistry.chemical_compoundGeneral EnergychemistryDehydrogenationAtomic ratioPhysical and Theoretical Chemistry0210 nano-technologySelectivityThe Journal of Physical Chemistry C
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Support effects on NiO-based catalysts for the oxidative dehydrogenation (ODH) of ethane

2019

[EN] We report on the effect of NiO-support interactions on the chemical nature of Ni species in a series of supported NiO catalysts for the ODH of ethane. SiO2, TiO2-anatase, a high surface area TiO2 and a porous clay hetero-structure (PCH) with TiO2 and SiO2 pillars were used as supports, which led to a selectivity to ethylene in the range 30-90% over supported NiO catalysts. The catalysts were characterized by means of XRD, N-2-Adsorption, H-2-TPR, XPS and in situ (under H-2 reductive atmosphere) and ex situ XAS spectroscopy. The catalytic performance of supported materials is discussed in terms of their reducibility and specific reduction kinetics, but also taking into account the speci…

X-ray absorption spectroscopyMaterials scienceEthyleneExtended X-ray absorption fine structureNon-blocking I/OOxidative dehydrogenation (ODH)02 engineering and technologyGeneral Chemistry010402 general chemistry021001 nanoscience & nanotechnology01 natural sciencesCatalysis0104 chemical sciencesCatalysisSupported NiOchemistry.chemical_compoundEthyleneEXAFSChemical engineeringchemistryX-ray photoelectron spectroscopyDehydrogenation0210 nano-technologySelectivity
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