Effect of partial Mo substitution by W on HDS activity using sulfide CoMoW/Al2O3–TiO2 catalysts

Obeso–Estrella, R.; Fierro, J.L.G.; León, J.N. Díaz de; Fuentes, S.; Alonso-Núñez, G.; Lugo-Medina, Eder; Pawelec, B.; Zepeda, T.A.

doi:10.1016/j.fuel.2018.06.078

Cited by 29 publications

(11 citation statements)

References 50 publications

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“…In another work, Chao et al [68] reached a conversion around 80% at 603 K and 3.5 Mpa with a model fuel containing thiophene at an initial concentration of 1500 ppm. In several other studies where the alumina was used as support, even though under harsh operating reaction (temperature, pressure), the catalyst activity was found lower than or equal to those of the current study [69][70][71]. Beside the excellent performance of the prepared catalysts in this study, they were prepared by a far simpler and faster procedure than all the above mentioned catalysts.…”

Section: Tpr Analysiscontrasting

confidence: 49%

WITHDRAWN: Fabrication of Nimo Nanostructured Catalyst via Ultrasonic-Assisted Combustion Method Used in High Efficiency Thiophene Hydrodesulfurization: Influence of Organic Compound Type

Hamidi¹,

Khoshbin²,

Karimzadeh³

2020

Preprint

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Alumina supported NiMo nanocatalysts were synthesized through ultrasonic-assisted combustion method with various organic additives, including citric acid, ethylene glycol, glycine and urea using in hydrodesulfurization of thiophene at atmospheric pressure. The samples were characterized by XRD, TGA, FESEM, EDX, BET-BJH and TPR analyses. The results indicated that the type of organic compound has a noticeable effect on phase structure, surface morphology and reducibility potential as a consequence of different amount of heat and gaseous products released during combustion reaction. Our method showed that a relatively homogeneous distribution of the active material over the support can be achieved. Using citric acid as an organic additive, led to synthesis of nanocatalyst in which more than 90% of particles are less than 70 nm. The sample synthesized by citric acid exhibited the highest activity in hydrodesulfurization reaction due to its significant properties such as high surface area, considerable surface hole and weakened metal-support interaction compared with other organic additives. In addition, activity assessment of the prepared catalyst by ethylene glycol and glycine demonstrated that 100% abatement of thiophene can be achieved at 105 °C and 30 min.

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Section: Tpr Analysiscontrasting

confidence: 49%

WITHDRAWN: Fabrication of Nimo Nanostructured Catalyst via Ultrasonic-Assisted Combustion Method Used in High Efficiency Thiophene Hydrodesulfurization: Influence of Organic Compound Type

Hamidi¹,

Khoshbin²,

Karimzadeh³

2020

Preprint

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“…47,48 Little adsorption at low relative pressure (below 0.2) can be attributed to the micropores, while adsorption at relative pressure above 0.7 originated from the presence of mesopores. 35 A similar result was obtained by Obeso-Estrella et al 49 Furthermore, the pore diameter distribution of the samples resulted from Barrett-Joyner-Halenda (BJH) calculation indicated narrow distributions at low fuel content. By increasing the fuel content, a shi to larger pore diameters has obtained in the case of NMACA2 and NMACA4, yielding a broaden pore diameter distribution.…”

Section: Fesem Analysissupporting

confidence: 82%

Facile fabrication, characterization and catalytic activity of a NiMo/Al₂O₃ nanocatalyst via a solution combustion method used in a low temperature hydrodesulfurization process: the effect of fuel to oxidant ratio

2020

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“…Early studies showed for example that Mo over Al/Ti = 1 and Ti/(Ti + Zr) = 0.8 supports lead to the highest activities among tested catalysts for hydrocracking and coal-derived liquids upgrading [69]. For the HDS of DBT, several reports have been published using Al/Ti = 2 to obtain the highest activity [4,35,52,55] among materials prepared by the sol-gel method.…”

Section: Mixed Oxides Support: a Different Approachmentioning

confidence: 99%

Recent Insights in Transition Metal Sulfide Hydrodesulfurization Catalysts for the Production of Ultra Low Sulfur Diesel: A Short Review

et al. 2019

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The literature from the past few years dealing with hydrodesulfurization catalysts to deeply remove the sulfur-containing compounds in fuels is reviewed in this communication. We focus on the typical transition metal sulfides (TMS) Ni/Co-promoted Mo, W-based bi- and tri-metallic catalysts for selective removal of sulfur from typical refractory compounds. This review is separated into three very specific topics of the catalysts to produce ultra-low sulfur diesel. The first issue is the supported catalysts; the second, the self-supported or unsupported catalysts and finally, a brief discussion about the theoretical studies. We also inspect some details about the effect of support, the use of organic and inorganic additives and aspects related to the preparation of unsupported catalysts. We discuss some hot topics and details of the unsupported catalyst preparation that could influence the sulfur removal capacity of specific systems. Parameters such as surface acidity, dispersion, morphological changes of the active phases, and the promotion effect are the common factors discussed in the vast majority of present-day research. We conclude from this review that hydrodesulfurization performance of TMS catalysts supported or unsupported may be improved by using new methodologies, both experimental and theoretical, to fulfill the societal needs of ultra-low sulfur fuels, which more stringent future regulations will require.

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Effect of partial Mo substitution by W on HDS activity using sulfide CoMoW/Al2O3–TiO2 catalysts

Cited by 29 publications

References 50 publications

WITHDRAWN: Fabrication of Nimo Nanostructured Catalyst via Ultrasonic-Assisted Combustion Method Used in High Efficiency Thiophene Hydrodesulfurization: Influence of Organic Compound Type

WITHDRAWN: Fabrication of Nimo Nanostructured Catalyst via Ultrasonic-Assisted Combustion Method Used in High Efficiency Thiophene Hydrodesulfurization: Influence of Organic Compound Type

Facile fabrication, characterization and catalytic activity of a NiMo/Al₂O₃ nanocatalyst via a solution combustion method used in a low temperature hydrodesulfurization process: the effect of fuel to oxidant ratio

Recent Insights in Transition Metal Sulfide Hydrodesulfurization Catalysts for the Production of Ultra Low Sulfur Diesel: A Short Review

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Effect of partial Mo substitution by W on HDS activity using sulfide CoMoW/Al2O3–TiO2 catalysts

Cited by 29 publications

References 50 publications

WITHDRAWN: Fabrication of Nimo Nanostructured Catalyst via Ultrasonic-Assisted Combustion Method Used in High Efficiency Thiophene Hydrodesulfurization: Influence of Organic Compound Type

WITHDRAWN: Fabrication of Nimo Nanostructured Catalyst via Ultrasonic-Assisted Combustion Method Used in High Efficiency Thiophene Hydrodesulfurization: Influence of Organic Compound Type

Facile fabrication, characterization and catalytic activity of a NiMo/Al2O3 nanocatalyst via a solution combustion method used in a low temperature hydrodesulfurization process: the effect of fuel to oxidant ratio

Recent Insights in Transition Metal Sulfide Hydrodesulfurization Catalysts for the Production of Ultra Low Sulfur Diesel: A Short Review

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Product

Resources

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Facile fabrication, characterization and catalytic activity of a NiMo/Al₂O₃ nanocatalyst via a solution combustion method used in a low temperature hydrodesulfurization process: the effect of fuel to oxidant ratio