Mechanisms of n-decane hydrocracking on a sulfided NiW on silica-alumina catalyst

Roussel, Martial

doi:10.1016/s0021-9517(03)00164-7

Cited by 37 publications

(13 citation statements)

References 18 publications

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“…Hydroconversion of n-decane on a sulfided Ni/W/silica-alumina catalyst in the presence of hydrogen sulfide and ammonia (286) gave the mono-branched isomers of C 10 and cracking products in the range of C 2 -C 8 alkanes. It was found that this catalyst is more selective than NiW/HUSYzeolite system (287). The main reaction observed is the transformation of n-decane into monobranched isomers.…”

Section: Other Potentially Important Catalysts For Hydroconversion Ofmentioning

confidence: 97%

Recent Advances and Future Aspects in the Selective Isomerization of High n‐Alkanes

2007

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Section: Other Potentially Important Catalysts For Hydroconversion Ofmentioning

confidence: 97%

Recent Advances and Future Aspects in the Selective Isomerization of High n‐Alkanes

2007

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“…Metals from group VIII, such as platinum and nickel, are commonly loaded onto the zeolites used in commercial refining processes as bifunctional catalysts, having both a hydrogenation/dehydrogenation function provided by the metal and an acidic function provided by the zeolite acid sites [28,29]. A common method for preparing bifunctional catalysts is a multi-step process consisting mainly of the deposition of a metal precursor compound over the support surface, either by impregnation, ion exchange or mechanical mixing; the drying and calcination of the catalysts; and the transformation of the precursor compound into the active metallic phase by reduction.…”

Section: Metal Loadingmentioning

confidence: 99%

The catalytic stability of some selected bifunctional nanoporous-based catalysts in the hydroisomerisation of n-C7 and the effect of post-synthesis modification techniques

et al. 2014

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In this work, some commercial and in-house nanoporous-based catalysts, such as USY, beta and mordenite zeolites, and mesoporous aluminosilicate molecular sieves such as MCM-48 and SBA-15, loaded with metals and acting as mono-and bimetallic bifunctional catalysts, were used for hydroisomerisation experiments in a fixedbed reactor at pressures between 1 and 15 bar and at feed space time ranging from 2.57 to 10.26 h-1 (35.14-140.6 kg s mol-1) to hydroisomerise n-heptane over a temperature range of 210-270°C. The effect of post-synthesis treatments of micro-and mesoporous catalysts was examined, regarding their activity, selectivity and stability, such as acid and steam dealumination techniques, acid leaching via a chelating agent, bimetal loading techniques, different platinum loading methods, and composite or hybrid catalyst generation. Results show that pore architecture is the most important factor affecting coke formation and deactivation in zeolite catalysts. It was found that those catalysts with high Si/Al ratios and those which had been acid-leached or steamed showed better activity, higher selectivity towards isomeric products and better time stability. Moreover, the balance between the number of metal sites and the number of acid sites played an important role in determining the activity, selectivity and stability of the bifunctional catalysts. Higher metal loading improves catalytic stability, due to a better balance and closeness of the catalytic functions. Moreover, the bimetallic catalyst improves the formation of smaller metal particles and better dispersion, which may affect selectivity and stability.

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“…In this study, n-decane is used as a model compound to represent petroleum or petroleum-derived fuels [4,24,25]. Even though the decane is~11.4 Å long, it has a strip shape, which can get through the 5.1-5.6 Å network in the ZSM-5 zeolite.…”

Section: Introductionmentioning

confidence: 99%

Designing a Mesoporous Zeolite Catalyst for Products Optimizing in n-Decane Hydrocraking

et al. 2019

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Mesoporous ZSM-5 zeolite is developed to enhance the catalytic performance in a hydrocracking reaction. The generated mesopores and mesoporous channels in the new catalyst supply more opportunities for reactant accessing the active sites according to the better mass transfer and diffusion. Meanwhile, the acidity of the mesoporous catalyst is also weakened because of the removal of Si and Al species from its MFI structure, which makes the products distribution drift to more valued chemicals such as olefins. In the modified mesoporous ZSM-5 zeolites via different metallic promoters, the olefins’ selectivity increases as the alkalinity of the catalyst increases. The reason for this is that the formed olefins will be further hydrogenated into corresponding alkanes immediately over the extremely acidic zeolite catalyst. Hence, the moderate alkalinity will limit this process, while at the same time the remaining olefins products will too. Furthermore, the Pd-based mesoporous ZSM-5 zeolite shows an excellent n-decane conversion and high propane selectivity due to the occurrence of hydrogen spillover via the Pd promoter. The phenomenon of hydrogen spillover supplies more chemisorbed sites of hydrogen atoms for hydrocracking and hydrogenating in this reaction. In short, this study explores the important effect factors in n-decane hydrocracking reaction activity and products distribution. It also shows a potential for the further industrial application of petroleum-derived fuel hydrocracking according to the optimized products distribution under metallic promoted mesoporous zeolite.

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Mechanisms of n-decane hydrocracking on a sulfided NiW on silica-alumina catalyst

Cited by 37 publications

References 18 publications

Recent Advances and Future Aspects in the Selective Isomerization of High n‐Alkanes

Recent Advances and Future Aspects in the Selective Isomerization of High n‐Alkanes

The catalytic stability of some selected bifunctional nanoporous-based catalysts in the hydroisomerisation of n-C7 and the effect of post-synthesis modification techniques

Designing a Mesoporous Zeolite Catalyst for Products Optimizing in n-Decane Hydrocraking

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