Catalytic activity in the oxidative dehydrogenation of ethane over Ni and/or Co molybdate catalysts: Synthesis and characterization

Boukhlouf, Hamza; Barama, Akila; Benrabaa, Rafik; Caballero, Jesús Guerrero; Löfberg, Axel; Bordes‐Richard, Elisabeth

doi:10.1016/j.crci.2016.02.016

Cited by 16 publications

(4 citation statements)

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“…Among various choices of reactive catalysts, Ni-based catalyst has been widely used in various catalytic applications, such as stream reforming processes, , water–gas shift reaction, , and biomass gasification . Ni-based catalyst has also been reported as a good catalyst for hydrogenation and dehydrogenation of small alkanes. − Recently, this catalyst has been reported as a candidate for the PDH process due to its high reactivity for hydrocarbon reaction, eco-friendliness, and lower cost compared to Pt-based catalysts. ,− Yan et al experimentally studied PDH reaction on Ni supported by SiO 2 (Ni/SiO 2 ). They found that the reaction rate of propane conversion is very high (about 1 × 10 14 molecule/s at 523 K).…”

Section: Introductionmentioning

confidence: 99%

Theoretical Insight into Catalytic Propane Dehydrogenation on Ni(111)

et al. 2018

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Here, propane dehydrogenation (PDH) to propylene and side reactions, namely, cracking and deep dehydrogenation on Ni(111) surface, have been theoretically investigated by density functional theory calculation. On the basis of adsorption energies, propane is physisorbed on Ni(111) surface, whereas propylene exhibits chemisorption supported by electronic charge results. In the PDH reaction, possible pathways can occur via two possible intermediates, i.e., 1-propyl and 2-propyl. Our results suggest that PDH reaction through 1-propyl intermediate is both kinetically and thermodynamically more favorable than another pathway. The C–C bond cracking during PDH process is more difficult to occur than the C–H activation reaction because of higher energy barrier of the C–C bond cracking. However, deep dehydrogenation is the preferable process after PDH, owing to the strong adsorption of propylene on Ni(111) surface, resulting in low selectivity of propylene production. This work suggests that Ni(111) has superior activity toward PDH; however, the enhancement of propylene desorption is required to improve its selectivity. The understanding in molecular level from this work is useful for designing and developing better Ni-based catalysts in terms of activity and selectivity for propane conversion to propylene.

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Section: Introductionmentioning

confidence: 99%

Theoretical Insight into Catalytic Propane Dehydrogenation on Ni(111)

et al. 2018

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“…Ethylene is one of the most produced and essential chemical products in the world [1][2][3]. Oxydehydrogenation of C 2 H 6 with CO 2 to C 2 H 4 provides new ideas for pressing issues (energy conservation and emission reduction, green chemical industry, sustainable development) [4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Selective catalytic and kinetic studies on oxydehydrogenation of ethane with CO2 over lanthanide metal catalysts

Wang¹,

Wang²,

Yang³

et al. 2020

Comptes Rendus. Chimie

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Single metal catalysts with different active components (La, Sm, Ce) and La loadings (5%, 10%, 15%) were prepared. Oxydehydrogenation of C 2 H 6 with CO 2 over the above catalysts was studied by catalyst activity experiments and characterization tests. The results indicate that the homogeneous reaction of CO 2 /C 2 H 6 is the coupling of ethane pyrolysis and hydrogenolysis. Dehydrogenation has better selectivity than reforming on La/Sm/Ce-based catalysts; Sm exhibits the best catalytic activity due to carbon deposition resistance and many oxygen vacancies. C 2 H 6 conversion on 10% Sm/SiO 2 is 42.75% at 700°C, but C 2 H 4 selectivity is lowest. Because of the existence of Ce 4+ , Ce has the best C 2 H 4 selectivity; it has potential to modify the catalyst, but its catalytic activity is lowest. La shows the best catalytic performance. The activation energy on 10% La/SiO 2 is 83.99 kJ/mol, C 2 H 4 selectivity is 96.84% at 700°C, and its optimum loading is between 10% and 15%.

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“…A lo largo de los últimos años, un gran número de catalizadores basados en metales de transición se han preparado de los cuales los catalizadores basados en níquel han reportado alcanzar buenos niveles de conversión de etano, sin embargo, la selectividad es todavía una tarea difícil de mejorar. La incorporación de promotores en la red de NiO tales como Ta, Nb, Ce, Co, W y Al aumentó el rendimiento de los catalizadores basados en NiO [4][5][6][7][8][9] . Heracleous y col. 6 , reportaron que la adición de promotores con valencia mayor que Ni 2+ tuvo un efecto positivo en el logro de buenas selectividades ya que eran capaces de disminuir los defectos catiónicos, y por lo tanto, las especies de oxígeno no selectivos que conllevan a la sobreoxidación de la olefina.…”

Section: Introductionunclassified

“…Un método de evaporación Rev Soc Quím Perú. 82 (4) 2016 simple pero controlada se realizó con el fin de favorecer la integración de fases para formar una solución mixta.…”

Section: Introductionunclassified

SÍNTESIS DE CATALIZADORES BASADOS EN ÓXIDOS MIXTOS DE Ni-Ti PARA LA PRODUCCIÓN DE ETILENO A PARTIR DE LA DESHIDROGENACIÓN CATALÍTICA DEL ETANO

Unsihuay

Picasso

Kou

2016

rsqp

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Se prepararon catalizadores a base de óxidos de níquel dopados con titanio Ni1-αTiα O con α de 0,01 a 0,05, por un método de evaporación controlada a 550ºC para la deshidrogenación oxidativa (ODH) de etano a etileno. La introducción de pequeñas cantidades de Ti en la celda del NiO tuvo efectos notables sobre las propiedades de óxido simple de níquel, aumentando la superficie BET. Además, se observó una disminución del tamaño del cristal tras el análisis XRD, una generación de nuevos sitios ácidos, evaluados por TPD-NH3 , una redistribución de especies reducibles a temperaturas más bajas y más altas estudiadas a partir del perfil TPR-H2 y una disminución de los oxígenos no estequiométricos con la composición creciente de titanio detectada por TPD-O2 . Los ensayos catalíticos se llevaron a cabo en condiciones de estado estacionario a una constante W/F de 0,48 g.s / mL con el fin de evaluar la conversión y se modificó la constante W/F de 0,24 a 0,48 g.s/ mL, para cuantificar la selectividad al etileno. En todos los catalizadores Ni1-αTiα O, las pruebas catalíticas revelaron un efecto positivo de dopaje de Ti en el rendimiento de las muestras, mejorando los niveles de conversión y de selectividad de etano al etileno, en comparación con el NiO puro. La muestra Ni0.95Ti0.05O logró la mejor selectividad para el etileno (77%) en una conversión moderada de etano del 35%, probablemente debido al aumento de las especies nucleofílicas de oxígeno superficial.

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Catalytic activity in the oxidative dehydrogenation of ethane over Ni and/or Co molybdate catalysts: Synthesis and characterization

Abstract: International audienc

Cited by 16 publications

References 46 publications

Theoretical Insight into Catalytic Propane Dehydrogenation on Ni(111)

Theoretical Insight into Catalytic Propane Dehydrogenation on Ni(111)

Selective catalytic and kinetic studies on oxydehydrogenation of ethane with CO2 over lanthanide metal catalysts

SÍNTESIS DE CATALIZADORES BASADOS EN ÓXIDOS MIXTOS DE Ni-Ti PARA LA PRODUCCIÓN DE ETILENO A PARTIR DE LA DESHIDROGENACIÓN CATALÍTICA DEL ETANO

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