Light straight-run gas oil hydrotreatment over sulfided CoMoP/Al2O3-USY zeolite catalysts

Marín, Celia; Escobar, José; Galván, Ernesto; Murrieta, Florentino; Zárate, René; Vaca, Heriberto

doi:10.1016/j.fuproc.2004.05.007

Cited by 24 publications

(19 citation statements)

References 22 publications

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“…The 29 Si MAS-NMR spectra for the MCM-22 samples obtained after the treatment with a high alkaline concentration (or with a long exposure time) show lower peak intensities. Especially the peaks with resonances below -105 ppm have decreased considerably.…”

Section: Characterizationsmentioning

confidence: 95%

“…Higher alkaline concentrations lead to a further change in the crystal morphology. 27 Al MAS-NMR and 29 Si MAS-NMR spectra of the parent and modified HMCM-22 samples are shown in Figs. 4 and 5a, b, respectively.…”

Section: Characterizationsmentioning

confidence: 99%

“…The parent and modified zeolites were investigated using X-ray diffraction (XRD), nitrogen adsorption, scanning electron microscopy (SEM) and 27 Al and 29 Si MAS-NMR. The amount of silicon leached from the zeolite was determined by chemical analysis.…”

Section: Introductionmentioning

confidence: 99%

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Alkaline Modification of MCM-22 to a 3D Interconnected Pore System and its Application in Toluene Disproportionation and Alkylation

et al. 2009

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Modification of HMCM-22 zeolite by alkaline treatment was investigated by various characterization techniques and in toluene disproportionation and alkylation with isopropyl alcohol. This 'desilication' process led for mild alkaline concentrations (*0.10-0.20 M NaOH at 323 K for 45 min) to the partial destruction of the zeolite framework, but also to the formation of additional mesoporosity. Furthermore, the accessibility/availability of Lewis acid sites, investigated by d 3 -acetonitrile and pyridine adsorption using FTIR spectroscopy, increased for these mild alkaline treatments, while the Brønsted acidity decreased. Higher alkaline concentrations (up to 0.50 M NaOH) led to a too severe framework and pore destruction and a decrease of both the Lewis and Brønsted acid site concentration. Decomposition and deconvolution of 29 Si MAS-NMR spectra confirmed the Si extraction and partial framework destruction, since more Q 3 SiOH groups were formed at the expense of the Q 4 T-atoms in the framework. Furthermore, the T6 and T7 Si-atoms were preferentially extracted, which would indicate that an interconnection between the intralayer and the interlayer and/or outer surface is formed. The toluene conversion in its disproportionation reaction increased for the mildly treated sample, while the selectivity to xylene isomers (and cymene and n-propyltoluene isomers in the alkylation reaction with isopropyl alcohol) was similar to the thermodynamic equilibrium, suggesting that the reaction primarily occurs at outer surface cups of the HMCM-22 zeolite.

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Section: Characterizationsmentioning

confidence: 95%

Section: Characterizationsmentioning

confidence: 99%

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Alkaline Modification of MCM-22 to a 3D Interconnected Pore System and its Application in Toluene Disproportionation and Alkylation

et al. 2009

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“…Therefore, aromatic reduction results in ''cleaner'', environmentally enhanced transportation fuels [4][5][6]. Beside significant sulphur reduction in diesel fuels a tougher limit for aromatic content (mainly polyaromatic content) is expected.…”

Section: Introductionmentioning

confidence: 99%

“…Beside quality requirements, demand for the transportation diesel fuels (mainly in the European Union) is also increasing [1][2][3]. It is expected that deep hydrodearomatization and hydrodesulphurization of gas oils may be needed in order to satisfy these requirements [4,5].…”

Section: Introductionmentioning

confidence: 99%

Investigation of hydrodearomatization of prehydrogenated gas oil fractions on Pt–Pd/H-USY catalysts

Nagy

Hancsók

Varga³

et al. 2007

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Hydrodearomatization (HDA), hydrodenitrogenation (HDN) and hydrodesulphurization (HDS) of real gas oils (various sulphur, nitrogen and total aromatic content) was investigated over Pd, Pt catalysts supported on USY zeolite, whose Pd/Pt mass ratio was varied between 6:1 and 1:3, and total metal contents were between 0.90 and 0.93. The effect of Pd/Pt ratio on HDA, HDN and HDS activities is presented. The advantageous process parameters for HDA, HDN and HDS of gas oils over a selected catalyst (e.g. Pd/Pt mass ratio 3:1) were determined. Additionally, the effect of key process parameters (temperature, pressure, LHSV) on the yield and quality of products was studied. Under optimal process parameters the HDA efficiency decreased with sulphur and nitrogen content of feed. The rate of HDA enhanced with Pt content of the catalyst while HDS and HDN efficiency increased with Pd content. The maximum aromatic saturation was 85% and it decreased with sulphur and nitrogen content of the feed.

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Fuels from Crude Oil (Petroleum)

2014

Fuels and Fuel‐Additives

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Light straight-run gas oil hydrotreatment over sulfided CoMoP/Al2O3-USY zeolite catalysts

Cited by 24 publications

References 22 publications

Alkaline Modification of MCM-22 to a 3D Interconnected Pore System and its Application in Toluene Disproportionation and Alkylation

Alkaline Modification of MCM-22 to a 3D Interconnected Pore System and its Application in Toluene Disproportionation and Alkylation

Investigation of hydrodearomatization of prehydrogenated gas oil fractions on Pt–Pd/H-USY catalysts

Fuels from Crude Oil (Petroleum)

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