Hydrofining of Oil Shale Pyrolysis Tar in the Presence of Ultradispersed Catalysts

Kadiev, Kh. M.; Gyul’maliev, A. M.; Zekel, L. A.; Kadieva, M. Kh.

doi:10.3103/s0361521918050051

Cited by 2 publications

(6 citation statements)

References 15 publications

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“…Catalytic activity tests under hydro-conversion conditions in per pass mode (catalyst loading 0,05 wt % Mo, P = 70 atm, T = 425 • C, H 2 /feed = 1500 nL/L, feed space velocity 1.4 hr −1 ) were performed following the procedure applied in our previous studies [13,15,18]. The composition of heavy oil residue, i.e., the continuous phase of reverse emulsions, was similar to that of the feed used for hydro-conversion tests.…”

Section: Discussionmentioning

confidence: 99%

“…Hydro-conversion tests in the presence of ex-situ synthesized sulfide molybdenum-containing catalysts were conducted in the flow mode using the pilot unit described in References [15,16] at constant parameters: temperature 425 • C, feed space velocity 0.4 and 1.4 h -1 , pressure 7.0 MPa, and hydrogen/feed ratio 1500 nL/L. The feedstock was prepared by mixing the vacuum residue (94 wt %) and FCC gas oil (6 wt %) with a portion of ex-situ prepared MoS2 suspension.…”

Section: Research Of Catalytic Activity In the Hydro-conversion Processmentioning

confidence: 99%

“…To compare the catalytic activity, an experiment with in-situ synthesized molybdenum disulfide [15] was also carried out. In this case, the feedstock loaded to the pilot unit was represented by reverse emulsion.…”

Section: Research Of Catalytic Activity In the Hydro-conversion Processmentioning

confidence: 99%

“…To evaluate the catalytic properties of the Cat (S) and Cat (TC) catalysts, hydro-conversion tests were performed under conditions described above to compare with the in-situ synthesized catalyst described in References [1,15,20]. The results are shown in Table 5.…”

Section: Activity Of Ex-situ Catalysts In Hydro-conversionmentioning

confidence: 99%

“…Practically, it is often necessary to process low-sulfur petroleum residues, such as the atmospheric residue of gas condensate, shale residue, polymer wastes, biomass, etc. [15]. In this case, it is required to use an ex-situ prepared suspension of an active nanosized catalyst.…”

Section: Introductionmentioning

confidence: 99%

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Ex-Situ Synthesis and Study of Nanosized Mo-Containing Catalyst for Petroleum Residue Hydro-Conversion

2019

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This study represents the results of ex-situ synthesis and research of the properties of concentrated suspensions with new catalysts for petroleum residue hydro-conversion. Suspensions were prepared and stabilized in a petroleum residue medium through reverse emulsions containing water-soluble Mo-precursor and S-containing agents (elemental sulfur, thiocarbamide) in the absence of a solid carrier. The resulting ex-situ catalyst dispersions had Mo content of 6-10 wt % and contained nanosized and submicron catalyst particles stabilized in a petroleum residue medium. The effects of S-containing agents on the properties of catalytic particles (sulfidation level, dispersity, structural and morphological features) were studied. The synthesis conditions for the optimal ex-situ catalyst providing the lowest coke yield (0.2 wt %) and the highest conversion (55.5 wt %) during petroleum residue hydro-conversion in a single pass mode have been determined.

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Section: Discussionmentioning

confidence: 99%

Section: Research Of Catalytic Activity In the Hydro-conversion Processmentioning

confidence: 99%

Section: Research Of Catalytic Activity In the Hydro-conversion Processmentioning

confidence: 99%

Section: Activity Of Ex-situ Catalysts In Hydro-conversionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ex-Situ Synthesis and Study of Nanosized Mo-Containing Catalyst for Petroleum Residue Hydro-Conversion

2019

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Determination of the Kinetic Parameters of Thermal Degradation and Hydrodemetallization of a Mixture of the Heavy Fraction of Low-Temperature Coal Tar and Coal Shale

Baikenov,

Izbastenova,

Sarsenbekova

et al. 2024

Energies

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The laws of thermal degradation of the mixture of the heavy fraction of low-temperature coal tar and coal shale were investigated using dynamic thermogravimetry. The kinetic characteristics of the process were determined using various methods, including the Ozawa–Flynn-Wall, Friedman, non-parametric kinetics and Šesták–Berggren methods. It is shown that coal shale initiated changes in the kinetic parameters and decomposition rate of the heavy fraction of coal tar. It was found that a 13% content of coal shale in the mixture led to the maximum rate of weight loss of the heavy fraction of coal tar. A hydrodemetallization kinetic model of the mixture of the heavy fraction of low-temperature coal tar and coal shale is proposed. The kinetic parameters of the hydrodemetallization process were determined; in addition, the rate constants at various temperatures were estimated. The study shows that the distribution of trace elements in the hydrogenate from the initial mixture and in the hydrogenate from the solid residue was characterized by relatively low values of reaction rate constants. The maximum microelement distribution rate was achieved in the hydrogenate solid residue. Energy indicators of activation processes indicated that hydrodemetallization at low temperatures is advantageous from an energy point of view.

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Hydrofining of Oil Shale Pyrolysis Tar in the Presence of Ultradispersed Catalysts

Cited by 2 publications

References 15 publications

Ex-Situ Synthesis and Study of Nanosized Mo-Containing Catalyst for Petroleum Residue Hydro-Conversion

Ex-Situ Synthesis and Study of Nanosized Mo-Containing Catalyst for Petroleum Residue Hydro-Conversion

Determination of the Kinetic Parameters of Thermal Degradation and Hydrodemetallization of a Mixture of the Heavy Fraction of Low-Temperature Coal Tar and Coal Shale

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