Analysis of the HDS of 4,6-DMDBT in the presence of naphthalene and carbazole over NiMo/Al2O3–SiO2(x) catalysts

Sánchez-Minero, Felipe; Ramı́rez, Jorge; Gutièrrez-Alejandre, Aı̀da; Fernández-Vargas, César; Torres–Mancera, Pablo; Cuevas-García, R.

doi:10.1016/j.cattod.2007.12.018

Cited by 40 publications

(27 citation statements)

References 38 publications

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“…Pd or Ptloaded solid acid catalysts have also been investigated for the hydrocracking of heavy hydrocarbons [20]. Although Ni-Mo/silica-alumina catalyst has been employed for upgrading crude oil [21], no noticeable progress has been made on the production of middle distillate through hydrocracking of F-T wax (n-paraffin) over NiMo/silicaalumina catalyst.…”

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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“…The surface modification of alumina with silica is an efficient way to weaken the metal-support interaction. Sanchez-Minero et al [46] studied the effect of incorporate SiO2 with a nominal loading of 10 wt% (SAC 10) onto the surface of alumina in NiMo/Al2O3-SiO2(x) catalysts for the hydrotreatment of mixtures of 4,6-DMDBT-naphthalene-carbazole. An infrared analysis of the hydroxyl region was carried out, characteristics bands of Al2O3 hydroxyl groups were observed at 3790, 3775, 3740, 3730 and 3680 cm À1 [47], and it can be noted from the IR spectrum of the alumina support (SAC).…”

Section: Hds Catalysts Supported On Sio2-al2o3mentioning

confidence: 99%

The Silicon on the Catalysis: Hydrodesulfurization of Petroleum Fractions

Cabrera‐Munguía¹,

Rosales-Marines²,

Rubio-Ríos³

et al. 2019

Silicon Materials

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The use of silicon in hydrodesulfurization (HDS) catalysts has had an impact on some of the fundamental parameters for the performance of the HDS catalyst, such as dispersion of the active phase, the extent of sulfidation, or the level of promotion. Mesoporous silicates such as MCM-41, SBA-15, the modified surface of γ-alumina with silica, or mixed Al 2 O 3-SiO 2 support have showed to affect the metal-support interaction, favoring the so-called type II Co(Ni)-Mo(W)-S structures. The aim of this chapter is to elaborate an analysis on the recent advances in the synthesis design of silicon catalyst support for the hydrodesulfurization of petroleum fractions.

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“…S1 shows. 20 These hydroxyl groups are responsible for the strong interaction that leads, during the calcination of the catalyst precursors, to Co and Ni species difficult to sulfide. Therefore, grafting SiO 2 to the alumina surface leads to more Co and Ni species available to form the active phase.…”

Section: B Mo-speciesmentioning

confidence: 99%

“…Many studies have been reported on the effect of different additives to alumina or silica to improve the catalyst performance [14][15][16][17] or to characterize the surface properties. 18,19 Although it is known that the addition of SiO 2 to the alumina surface improves the HDS catalyst performance, 20,21 a systematic study of the changes in activity, selectivity, dispersion, sulfidation, and extent of promotion for CoMo and NiMo hydrodesulfurization catalysts supported on Al 2 O 3 and SiO 2 /Al 2 O 3 has not yet been made. Accordingly, the aim of this work is to analyze how the HDS activity, selectivity, dispersion, sulfidation, and promotion of CoMo and NiMo HDS catalysts are affected by changing the nature of the catalyst support from pure Al 2 O 3 to alumina grafted with 4 wt% SiO 2 .…”

Section: Introductionmentioning

confidence: 99%

Relevant changes in the properties of Co(Ni)Mo/Al₂O₃HDS catalysts modified by small amounts of SiO₂

et al. 2018

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The changes in hydrodesulfurization activity, selectivity, dispersion, sulfidation, and extent of promotion of Co(Ni)Mo catalysts were investigated when the alumina support surface is modified by grafting 4 wt% silica. Adding SiO 2 eliminates the most reactive hydroxyl groups on the alumina surface (IR band at 3775 cm À1 ) decreasing the possibility of generating tetrahedral Mo species difficult to sulfide in favor of octahedral ones capable of contributing to the sulfided active phase. The catalysts were evaluated in the hydrodesulfurization of 4,6-dimethyldibenzothiophene. Incorporating SiO 2 to alumina increases the hydrogenation rate constant and therefore the global hydrodesulfurization rate of 4,6-dimethyldibenzothiophene and enhances the promotion of Mo by Co (or Ni). The global sulfidation of Ni is not affected by the addition of silica but the sulfidation of cobalt is significantly improved. The extent of promotion of the NiMo/Al 2 O 3 and NiMo/SiO 2 / Al 2 O 3 catalysts was greater than the one achieved in their Co-promoted counterparts.

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Analysis of the HDS of 4,6-DMDBT in the presence of naphthalene and carbazole over NiMo/Al2O3–SiO2(x) catalysts

Cited by 40 publications

References 38 publications

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

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

The Silicon on the Catalysis: Hydrodesulfurization of Petroleum Fractions

Relevant changes in the properties of Co(Ni)Mo/Al₂O₃HDS catalysts modified by small amounts of SiO₂

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Analysis of the HDS of 4,6-DMDBT in the presence of naphthalene and carbazole over NiMo/Al2O3–SiO2(x) catalysts

Cited by 40 publications

References 38 publications

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

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

The Silicon on the Catalysis: Hydrodesulfurization of Petroleum Fractions

Relevant changes in the properties of Co(Ni)Mo/Al2O3HDS catalysts modified by small amounts of SiO2

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Relevant changes in the properties of Co(Ni)Mo/Al₂O₃HDS catalysts modified by small amounts of SiO₂