Effect of Phase Composition of the Oxidic Precursor on the HDS Activity of the Sulfided Molybdates of Fe(II), Co(II), and Ni(II)

Brito, Joaquı́n L.; Barbosa, Aida L.

doi:10.1006/jcat.1997.1796

Cited by 157 publications

(128 citation statements)

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“…For CoMoϕy623 consistency with the reduction temperatures reported by Brito and Barbosa [25] for β-CoMoO 4 were observed. It was established that a reduction to lower valence oxidized states takes place, generating equimolar mixtures of Co 2 Mo 3 O 8 and Co 2 MoO 4 species, followed by a high-temperature reduction to the metals; these events take place at 807 K and 1113 K respectively.…”

Section: Temperature Programmed Reduction (Tpr)supporting

confidence: 89%

Oxidative dehydrogenation of propane with cobalt, tungsten and molybdenum based materials

Salamanca

Licea

Echavarría-Isaza

et al. 2017

Rev. Fac. Ing. Univ. Antioquia

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ABSTRACT:Oxidative dehydrogenation of propane is a reliable alternative for olefins production. This paper presents the results obtained on oxidative dehydrogenation of propane by using two materials based on cobalt, tungsten, and molybdenum. The materials were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), temperature programmed reduction (TPR), thermogravimetric analysis (TGA), and differential thermal analysis (DTA). The CoMoϕy material was calcined at 623 K, transforming itself to β-CoMoO4 phase (CoMoϕ623), the same phase is observed when the material is calcined at 873 K (CoMoϕy873). CoMoϕy623 showed the best performance in oxidative dehydrogenation of propane, a yield to propene of 3.4% was obtained at 623 K using a space velocity of 100 mLg-1min-1. CoWsϕy was calcined at 673 K, a low crystallinity wolframite was obtained. This material has a high selectivity to propene and low yield. CoMoϕy873 has a selectivity and conversion within the range of the results reported in the literature. This is a prospective catalyst for the oxidative dehydrogenation of propane; it was stable for 24 h of continuous operation at 773 K. RESUMEN:La deshidrogenación oxidativa de propano es una alternativa interesante para la obtención de olefinas. En este trabajo se presentan los resultados obtenidos en la deshidrogenación oxidativa de propano utilizando dos materiales a partir de cobalto, tungsteno y molibdeno. Los materiales fueron caracterizados utilizando Difracción de Rayos X (XRD), espectroscopia infrarroja con transformada de Fourier (FTIR), análisis termogravimétrico (TGA) y análisis térmico diferencial (DTA). El material CoMoϕy al ser calcinado a 623 K se transforma en la fase β-CoMoO4 (CoMoϕy623), la misma fase es obtenida cuando el material se calcina a 873 K (CoMoϕy873). CoMoϕy623 muestra un buen desempeño en la deshidrogenación oxidativa de propano, se obtuvo un rendimiento a propeno de 3,4% a una temperatura de 623 K y una velocidad espacial de 100 mL g-1 min-1. El material CoWsϕy fue calcinado a 673 K, obteniéndose una fase wolframita de baja cristalinidad. Este material presenta una alta selectividad a propeno y un bajo rendimiento. CoMoϕy873 presenta una buena actividad y selectividad, comparable con otros materiales reportados en la literatura, y su potencial como catalizador en la deshidrogenación oxidativa de propano se hace más evidente con la prueba que muestra ser estable durante 24 h de operación continua a 773 K.

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Section: Temperature Programmed Reduction (Tpr)supporting

confidence: 89%

Oxidative dehydrogenation of propane with cobalt, tungsten and molybdenum based materials

Salamanca

Licea

Echavarría-Isaza

et al. 2017

Rev. Fac. Ing. Univ. Antioquia

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“…[1][2][3][4][5] Among these, transition-metal-containing molybdates are attractive candidates due to their structural, electronic, and catalytic properties. [6][7][8][9][10] For example, β-FeMoO 4 and Fe 2 (MoO 4 ) 3 have been employed in the synthesis of formaldehyde from methanol on a commercial scale, and Fe-Mo-O catalysts exhibit good activity for the oxidation of toluene to benzaldehyde. [11] In addition, it has been found that β-FeMoO 4 is a very good precursor of catalysts for hydrodesulfurization (HDS) processes, [12] and cobalt and nickel molybdates are important components of industrial catalysts for the partial oxidation of hydrocarbons and precursors in the synthesis of catalysts for hydrodesulfurization (HDS).…”

Section: Introductionmentioning

confidence: 99%

Influence of 2‐Aminopyridine on the Formation of Molybdates under Hydrothermal Conditions

Pavani

Ramanan

2005

Eur J Inorg Chem

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“…In addition, CoMoO 4 can also be applied in the electronics and bioscience industries due to its structural, magnetic, electronic and antibacterial properties [9][10][11][12][13][14][15][16][17]. Therefore, four stoichiometric type CoMoO 4 crystalline structures are reported by the literature.…”

Section: Introductionmentioning

confidence: 99%

Photoluminescent Properties of CoMoO<sub>4</sub> Nanorods Quickly Synthesized and Annealed in a Domestic Microwave Oven

Moura¹,

Oliveira²,

Pereira³

et al. 2012

ACES

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A simple way to prepare -and -CoMoO 4 nanorods is reported in this paper. CoMoO 4 ·xH 2 O nanorod precursors were obtained using the microwave-assisted hydrothermal (MAH) method. By annealing the as-prepared CoMoO 4 ·xH 2 O precursor at 600˚C for 10 min in a domestic microwave oven, -and -CoMoO 4 nanorods were prepared. These powders were analyzed by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), Fourier transform Raman microscopy and ultraviolet visible absorption spectroscopy (UV-vis spectra) as well as photoluminescence (PL) measurements. Based on the results, these materials revealed nanorod morphology. PL spectra obtained at room temperature for -and -CoMoO 4 particles exhibited maximum components around the blue light emission. The results show that the domestic microwave oven has been successfully employed to obtain -and -CoMoO 4 nanoparticles.

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Effect of Phase Composition of the Oxidic Precursor on the HDS Activity of the Sulfided Molybdates of Fe(II), Co(II), and Ni(II)

Cited by 157 publications

References 43 publications

Oxidative dehydrogenation of propane with cobalt, tungsten and molybdenum based materials

Oxidative dehydrogenation of propane with cobalt, tungsten and molybdenum based materials

Influence of 2‐Aminopyridine on the Formation of Molybdates under Hydrothermal Conditions

Photoluminescent Properties of CoMoO<sub>4</sub> Nanorods Quickly Synthesized and Annealed in a Domestic Microwave Oven

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Effect of Phase Composition of the Oxidic Precursor on the HDS Activity of the Sulfided Molybdates of Fe(II), Co(II), and Ni(II)

Cited by 157 publications

References 43 publications

Oxidative dehydrogenation of propane with cobalt, tungsten and molybdenum based materials

Oxidative dehydrogenation of propane with cobalt, tungsten and molybdenum based materials

Influence of 2‐Aminopyridine on the Formation of Molybdates under Hydrothermal Conditions

Photoluminescent Properties of CoMoO&lt;sub&gt;4&lt;/sub&gt; Nanorods Quickly Synthesized and Annealed in a Domestic Microwave Oven

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Photoluminescent Properties of CoMoO<sub>4</sub> Nanorods Quickly Synthesized and Annealed in a Domestic Microwave Oven