Design and development of Ti-modified zeolite-based catalyst for hydrocracking heavy petroleum

Shimada, Hiromichi; Sato, Koichi; Honna, Kôsaku; Enomoto, Toshiyuki; Ohshio, Nobuyasu

doi:10.1016/j.cattod.2008.04.012

Cited by 30 publications

(10 citation statements)

References 31 publications

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“…Important works have been carried out in the last period to upgrade heavy cuts, like atmospheric or vacuum residues, into valuable distillates using catalysts (Shimada et al, 2009;Elizalde et al, 2009;Rana et al, 2007;Ancheyta et al, 2005;Zhang et al, 2005;Kressmann et al, 1998;Morel et al, 1997;Toulhoat et al, 1990). This conversion requires demetallation (Ni and V), sulfur and nitrogen subtraction.…”

Section: Introductionmentioning

confidence: 99%

Diffusion of asphaltene molecules through the pore structure of hydroconversion catalysts

Tayakout

Ferreira

Espinat

et al. 2010

Chemical Engineering Science

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Section: Introductionmentioning

confidence: 99%

Diffusion of asphaltene molecules through the pore structure of hydroconversion catalysts

Tayakout

Ferreira

Espinat

et al. 2010

Chemical Engineering Science

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“…Crystalline aluminosilicate Y zeolite has typical microporous structure and three-dimensional channels. Due to its adjustable acidity, high surface area, and thermal/hydrothermal stabilities, Y zeolite has been widely used in many reactions such as fluid catalytic cracking (FCC) [2], hydrocracking [3], alkylation [4] and desulfurization [5]. However, with the crude oil supplies becoming severe and inferior, the micropore of conventional Y zeolite set severe limitation on the diffusion of large-molecule reactants and products [6].…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of hierarchical USY by post-treatment

et al. 2015

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Two modifying agents, citric acid and EDTA2Na, were used to modify USY zeolite to obtain the hierarchical USY with high crystallinity. XRD, N 2 isothermal sorption, 27 Al and 29 Si NMR, and TEM were adopted to characterize the dealumination process in the post-treatment of USY. The results showed that all modified USY have increased surface areas and pore volume due to the removal of non-framework Al species. Besides, framework dealumination occurred in the modification process. USY-EC, which was modified by the combined effects of citric acid and EDTA-2Na, has the highest SiO 2 /Al 2 O 3 ratio of 19.40 and relatively high crystallinity.

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“…However, the relation between active phase crystal morphology and HDS activity can't be determined only depending on the stacking degree of the crystal morphology. Shimada et al [46] summarized the relation, indicating that the higher aspect ratios (approximately equal to the thickness divided by length) of the crystal morphology, the higher intrinsic activity of the catalyst. Many studies [5,23,26,28,32,49] have supported the view.…”

Section: The Active Phase Crystal Morphologymentioning

confidence: 99%

“…Generally speaking, multilayer stacking shows better performance than the single-layer. This is mainly manifested in two aspects: First, multilayer stacking can generate more type II active sites than the single-layer due to its weaker interaction with carrier except the basal layer [46]. The top layer possesses the highest activity because of the weakest steric hindrance and higher unsaturation degree of the brim and corners active sites [8], in addition, the top layer and middle layers also differ in the desulfurization mechanism, the brim of the top layer owns capability of DDS (direct desulfurization) and HY D (hydrogenation desulfurization) routes while the middle layers only have DDS activity [47].…”

Section: The Active Phase Crystal Morphologymentioning

confidence: 99%

Advancement of Hydro-Desulfurization Catalyst and Discussion of Its Application in Coal Tar

Liu¹,

Zhang²,

Jiang³

et al. 2013

ACES

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This paper describes the influences of active metal, promoter and chelating agent on the properties of hydro-desulfurization catalyst. The use of chelating agent, especially its combination with common promoters e.g., EDTA-P, has an important meaning to develop highly active catalyst, specifically to unify the active metal dispersion degree and sulfurization degree in some extent, however, they are contradictory in conventional cognition. In the aspect of carriers, composition and nanometer carriers have more excellent performances in acidity, pores structure and metal-carrier interaction than common carriers, and are the developing trend in the future and should be a breakthrough mainly in preparation methods. We also pointed out the decisive factors to improve the activity of the catalyst: higher sulfurization degree of active metal oxide and higher aspect ratios of active phase crystal morphology, and the proper acidity and pores structure can be considered the key factors for deep desulfurization whose mainly obstacle is the desulfurization of large rigid molecules, e.g., dibenzothiophene and 4, 6-dimethyl substituted dibenzothiophene. Based on above that, We discussed the suitable hydrodesulfurization (HDS) catalyst for coal tar, aiming at providing some theoretical guidance for the "design" of coal tar HDS catalyst.

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Design and development of Ti-modified zeolite-based catalyst for hydrocracking heavy petroleum

Cited by 30 publications

References 31 publications

Diffusion of asphaltene molecules through the pore structure of hydroconversion catalysts

Diffusion of asphaltene molecules through the pore structure of hydroconversion catalysts

Preparation and characterization of hierarchical USY by post-treatment

Advancement of Hydro-Desulfurization Catalyst and Discussion of Its Application in Coal Tar

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