Surface properties and hydrocracking activity of NiMo zeolite catalysts

Egia, B.; Cambra, J.F.; Arias, P.L.; Güemez, M.B.; Legarreta, J.A.; Pawelec, B.; Fierro, J.L.G.

doi:10.1016/s0926-860x(97)00320-7

Cited by 25 publications

(9 citation statements)

References 31 publications

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“…Alkanes are dehydrogenated on the metallic sites and then isomerized or cracked on the acid sites through classical and non-classical carbenium ion chemistry [12][13][14]. The most conventional hydrocracking catalysts used for the production of gasoline or diesel from crude oil are NiMo and NiW catalysts supported on alumina [15], silica-alumina [16], fluorine-doped alumina [17], USY zeolite [18], and molecular sieves [19]. Pd or Ptloaded solid acid catalysts have also been investigated for the hydrocracking of heavy hydrocarbons [20].…”

Section: Introductionmentioning

confidence: 99%

Production of Middle Distillate Through Hydrocracking of Paraffin Wax over NiMo/SiO2–Al2O3 Catalysts: Effect of SiO2–Al2O3 Composition on Acid Property and Catalytic Performance of NiMo/SiO2–Al2O3 Catalysts

et al. 2008

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SiO 2 -Al 2 O 3 supports with different composition were prepared by a precipitation method in order to control the acid property of SiO 2 -Al 2 O 3 supports. NiMo/ SiO 2 -Al 2 O 3 catalysts were then prepared by an impregnation method and sulfided for use in the production of middle distillate through hydrocracking of paraffin wax. It was revealed that MoS 2 phase was dominantly formed in the NiMo/SiO 2 -Al 2 O 3 catalysts, while Ni-Mo-S phase was not detected due to its fine dispersion. Acidity of NiMo/SiO 2 -Al 2 O 3 catalysts measured by NH 3 -TPD experiments showed a volcano-shaped curve with respect to SiO 2 content. Acidity of the catalysts played an important role in determining the catalytic performance in the hydrocracking of paraffin wax. Conversion of paraffin wax was monotonically increased with increasing acidity of the catalyst, while yield for middle distillate showed a volcano-shaped curve with respect to acidity of the catalyst. Thus, optimal acidity of NiMo/SiO 2 -Al 2 O 3 catalysts was required for the maximum production of middle distillate through hydrocracking of paraffin wax.

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Section: Introductionmentioning

confidence: 99%

Production of Middle Distillate Through Hydrocracking of Paraffin Wax over NiMo/SiO2–Al2O3 Catalysts: Effect of SiO2–Al2O3 Composition on Acid Property and Catalytic Performance of NiMo/SiO2–Al2O3 Catalysts

et al. 2008

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“…Pressure effect at 350 °C, reversed the relationship C 18 /C 17 . at 2 MPa, the quantity of C 18 was higher than C 17 . it was reversed when the pressure increase to 5 MPa and it was intensified at 8 MPa.…”

Section: Cracking and Deoxygenation Of Molecules Modelsmentioning

confidence: 80%

“…The difference of the amount of aldehydes (37.7%) and alcohol (2.1%) in the product suggests that hydrogenation from the metal sites inhibited mainly the full deoxygenation of acid by the reaction of -OH with hydrogen, forming aldehydes, but also to attack with less intensity the =O bonds forming alcohol. Moreover, Egia et al (Egia et al, 1998) employed n-Decane like model molecule at variable temperature and pressure. under these conditions, it was found that there is no relationship between the degree of saturation of products and the degree of acidity of the catalyst.…”

Section: Cracking and Deoxygenation Of Molecules Modelsmentioning

confidence: 99%

Biofuel production from thermocatalytic processing of vegetable oils: a review

Cassio

Ortiz-Bravo

Machado

2015

revfue

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With the worsening environmental problems caused by the greenhouse effect, the study of fuel alternatives generated by non-fossil sources has intensifi ed. The incorporation of biodiesel (mono-ester of triglycerides) to petroleum diesel is an example of commercial application for reduction in the emission of fossil CO 2 and sOx and nOx as well. in this context, the generation of mixture of hydrocarbons for catalytic cracking of vegetable oils combines the advantages of the Transesterifi cation process to generate compounds such as petroleum-derived fuels such as: gasoline, kerosene and diesel. This review presents current trends in scientifi c literature for biofuels from thermal (pyrolysis) and catalytic processing. For the pyrolysis it has been described the temperatures use to obtain the fuel in the diesel range. the catalytic processing involves the heterogeneous catalysts used in the processing crude oil and the conditions of temperature and pressure. in conclusion it is showed that the cracking catalytic process allows chose what fuel does one want simply changing the catalytic that is used.Keywords: Biofuels, Pyrolysis, Hydroprocessing, vegetable oils. Producción de biocombustibles por medio de los procesos termocatalíticos de aceites vegetales: una reseña resuMenCon el empeoramiento de los problemas ambientales causados por el efecto invernadero, el estudio de combustibles alternativos generados por fuentes so fósiles ha sido intensifi cado. La incorporación de biodiesel (mono-éster de triglicéridos) a diesel de petróleo es un ejemplo de una aplicación comercial para la reducción en la emisión de CO2 fósil, sOx al igual que nOx. en este contexto, la generación de mezclas de hidrocarburos para craqueo catalítico de aceites vegetales combina las ventajas de los procesos de Transesterifi cación para generar componentes como los combustibles derivados del petróleo, como: gasolina, kerosene y diesel. esta reseña presenta las tendencias actuales en la literatura científi ca para procesos térmicos (pirolisis) y catalíticos en los biocombustibles. Para la pirolisis se han descrito las temperaturas usadas para obtener el combustible en los rangos de diesel. Los procesos catalíticos implican los catalizadores heterogéneos usados en el procesamiento del crudo y las condiciones de presión y temperatura. en conclusión se muestra que el proceso de craqueo catalítico permite elegir que combustible puede buscarse simplemente cambiando la catálisis que es usada.

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“…It is generally accepted that the identity of support strongly affects the catalytic performance of metal/acid bifunctional catalyst in the hydrocracking reaction [28]. In particular, acid property of support plays an important role for efficient production of middle distillate [20].…”

Section: Introductionmentioning

confidence: 99%