Effect of acidity and metal content on the activity and product selectivity for n-decane hydroisomerization and hydrocracking over nickel–tungsten supported on silica–alumina catalysts

Rezgui, Yacine; Guemini, Miloud

doi:10.1016/j.apcata.2004.11.044

Cited by 75 publications

(29 citation statements)

References 50 publications

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“…Additionally, Fe/WO 3 + ZrO 2 , with the highest yield of H 2 , showed excellent stability during the test. The performance of Fe/WO 3 + ZrO 2 can be attributed to the properties of its support: like the unique acidity of WO 3 , its chemical and thermal stability [18][19][20]. The addition of WO 3 to the pristine ZrO 2 enhanced the diffusion of carbon deposits from the MD, making the active metal sites accessible to the feed, and its reported thermal stability contributes to the inhibition of metal aggregation, sintering, and the loss of catalyst structure.…”

Section: Catalytic Testmentioning

confidence: 99%

“…Additionally, its chemical and thermal stability properties could be of utmost importance in reaction to the CH 4 decomposition. Furthermore, WO 3 has versatile applications and has been used in the cracking of heavy fractions in petroleum as well as dehydrogenation of alcohols [18][19][20]. Lanthanum (III) oxide (La 2 O 3 ) has been tested in MD, being used as support over Fe.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

H2 Production from Catalytic Methane Decomposition Using Fe/x-ZrO2 and Fe-Ni/(x-ZrO2) (x = 0, La2O3, WO3) Catalysts

et al. 2020

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An environmentally-benign way of producing hydrogen is methane decomposition. This study focused on methane decomposition using Fe and Fe-Ni catalysts, which were dispersed over different supports by the wet-impregnation method. We observed the effect of modifying ZrO2 with La2O3 and WO3 in terms of H2 yield and carbon deposits. The modification led to a higher H2 yield in all cases and WO3-modified support gave the highest yield of about 90% and was stable throughout the reaction period. The reaction conditions were at 1 atm, 800 °C, and 4000 mL(hgcat)−1 space velocity. Adding Ni to Fe/x-ZrO2 gave a higher H2 yield and stability for ZrO2 and La2O3 + ZrO2-supported catalysts whose prior performances and stabilities were very poor. Catalyst samples were analyzed by characterization techniques like X-ray diffraction (XRD), nitrogen physisorption, temperature-programmed reduction (TPR), thermo-gravimetric analysis (TGA), and Raman spectroscopy. The phases of iron and the supports were identified using XRD while the BET revealed a significant decrease in the specific surface areas of fresh catalysts relative to supports. A progressive change in Fe’s oxidation state from Fe3+ to Fe0 was observed from the H2-TPR results. The carbon deposits on Fe/ZrO2 and Fe/La2O3 + ZrO2 are mainly amorphous, while Fe/WO3 + ZrO2 and Fe-Ni/x-ZrO2 are characterized by graphitic carbon.

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Section: Catalytic Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

H2 Production from Catalytic Methane Decomposition Using Fe/x-ZrO2 and Fe-Ni/(x-ZrO2) (x = 0, La2O3, WO3) Catalysts

et al. 2020

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“…The addition of a catalyst to HDC can reduce the operational severity while leading to more favorable products [7]. A HDC catalyst must have bi-functionality, consisting of dehydrogenation/ hydrogenation metals, for example, Co-Mo [8] or Ni-Mo [9], as well as a strong acidic support such as silica-alumina [10,11] that can crack the hydrocarbon molecules [12]. Good distribution and abundance of acidic and metallic sites on a HDC catalyst largely dictates its performance, as larger distances between sites impede the step-by-step reactions during HDC [13].…”

Section: Introductionmentioning

confidence: 99%

Hydrocracking of Athabasca Vacuum Residue Using Ni-Mo-Supported Drill Cuttings

2019

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Ni-Mo supported drill cuttings were used to catalyze the hydrocracking (HDC) of Athabasca vacuum residue (AVR) in an autoclave. Drill cuttings are a common waste product that are, depending on their origin, plentiful in acidic sites. The catalyst was prepared using the wet impregnation method. HDC was carried out at both low and high H2 pressure at 400 °C. Control thermal cracking (TC) and HDC runs with and without raw drill cuttings were performed to better examine the role of the supported drill cuttings catalyst. The quality in terms of viscosity and °API gravity, and the yield of various fractions making up the product oil were used to gauge the performance of the catalyst. Similar temperature and energy profiles between TC and HDC suggested strong overlap between the two different reactions, despite H2 presence. Nevertheless, supported drill cuttings runs at high H2 pressures promoted H2 consumption to a strong extent. Consequently, the liquid yield was the highest (~75 wt.%) and the coke yield was negligible. High temperature simulated distillation results revealed a residue conversion of ~55% for both low and high pressure HDC catalytic runs. The product oil quality with respect to viscosity and °API gravity was also found to be comparable between the low and high pressure HDC catalytic runs. Accordingly, no trade-off between liquid yield and quality was incurred at high H2 pressure. Effectively the supported drill cuttings drastically reduced coke formation, while maximizing the yield of the desired liquid product.

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“…The role and importance of catalysts in the hydrocracking processes has been intensely studied [14][15][16][17][18][19][20][21][22][23][24][25][26][27]. Generally, the hydrocracking catalysts composed of noble metals or transition metals paired with a mesoporous support have dual functions in the reaction process.…”

Section: Introductionmentioning

confidence: 99%

“…These are (a) cracking C-C bonds from high-molecular weight hydrocarbons and (b) hydrogenating the unsaturated hydrocarbons formed in the cracking steps and/or were already present in the feedstock [17,18]. The most conventional catalysts are NiW, NiMo, and CoMo bimetallic paired on a number of supports, including zeolite, silica-alumina, and alumina [19][20][21][22]. Recently, Pd-based catalysts have also been widely used due to their high activity on hydrocracking sulfur-free heavy hydrocarbons [24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Mesoporous Silica-Supported Palladium Catalysts for Biofuel Upgrade

Ling

Reddy

Hill

et al. 2012

Journal of Nanotechnology

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We report the preparation of two hydrocracking catalysts Pd/CoMoO 4 /silica and Pd/CNTs/CoMoO 4 /silica (CNTs, carbon nanotubes). The structure, morphologies, composition, and thermal stability of catalysts were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy, transmission electron microscopy (TEM), energy-dispersive X-ray (EDX), and thermogravimetric analysis (TGA). The catalyst activity was measured in a Parr reactor with camelina fatty acid methyl esters (FAMEs) as the feed. The analysis shows that the palladium nanoparticles have been incorporated onto mesoporous silica in Pd/CoMoO 4 /silica or on the CNTs surface in Pd/CNTs/CoMoO 4 /silica catalysts. The different combinations of metals and supports have selective control cracking on heavy hydrocarbons.

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Effect of acidity and metal content on the activity and product selectivity for n-decane hydroisomerization and hydrocracking over nickel–tungsten supported on silica–alumina catalysts

Cited by 75 publications

References 50 publications

H2 Production from Catalytic Methane Decomposition Using Fe/x-ZrO2 and Fe-Ni/(x-ZrO2) (x = 0, La2O3, WO3) Catalysts

H2 Production from Catalytic Methane Decomposition Using Fe/x-ZrO2 and Fe-Ni/(x-ZrO2) (x = 0, La2O3, WO3) Catalysts

Hydrocracking of Athabasca Vacuum Residue Using Ni-Mo-Supported Drill Cuttings

Preparation of Mesoporous Silica-Supported Palladium Catalysts for Biofuel Upgrade

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