Catalyst Deactivation in Slurry-Phase Residue Hydroconversion

Rezaei, Hooman; Smith, Kevin J.

doi:10.1021/ef401024a

Cited by 32 publications

(33 citation statements)

References 35 publications

(90 reference statements)

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“…Methane and ethane were the major [37,38], which could contribute to the catalyst deactivation during the heavy oil hydrocracking process, does not exist in the model reactant system. Therefore, hydrogen free radical was provided during the whole reaction process and the formation of isomerization products was suppressed sharply.…”

Section: Hydrocracking Of Model Reactantmentioning

confidence: 99%

Slurry-phase hydrocracking of heavy oil and model reactant: effect of dispersed Mo catalyst

Ren

et al. 2015

Appl Petrochem Res

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Thermal hydrocracking and catalytic hydrocracking of heavy oil and model reactant have been carried out to investigate the effect of dispersed Mo catalyst on slurry-phase hydrocracking. The XRD and XPS patterns suggested that the major existence form of dispersed Mo catalyst in slurry-phase hydrocracking was MoS 2 . Experimental data revealed that the conversion of feedstock oils and model reactant increased with the presence of catalyst, while the yields of light products (gas, naphtha) and heavy products (vacuum residue, coke) decreased, the yields of diesel and vacuum gas oil increased in the meantime. Besides, the yields of aromatic hydrocarbon and naphthenic hydrocarbon in naphtha fraction decreased. Effect parameters R G (the ratio of i-C 4 H 10 yield to n-C 4 H 10 yield) and isoparaffin/n-paraffin ratio were proposed to study the reaction mechanism of slurry-phase hydrocracking, the smaller effect parameters showed that there was no carbonium ion mechanism in slurry-phase hydrocracking, which still followed the free radical mechanism, and that the isomerization ratio of products decreased with the presence of Mo catalyst.

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Section: Hydrocracking Of Model Reactantmentioning

confidence: 99%

Slurry-phase hydrocracking of heavy oil and model reactant: effect of dispersed Mo catalyst

Ren

et al. 2015

Appl Petrochem Res

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“…In the case of unsupported catalysts formed in situ during heavy oil hydroconversion, several studies have reported the formation of nickel and vanadium sulfides from inherent metal complexes by various techniques. In a series of reports by Rezaei et al 10–12. concerning residue hydroconversion with unsupported MoS 2 catalysts, the coke–catalyst mixtures were separated and analyzed in detail by XRD and SEM combined with elemental mapping.…”

Section: Introductionmentioning

confidence: 99%

The Catalytic Performance of Metalloporphyrins during Hydrogenation of Anthracene

Liu

Wang

et al. 2014

Energy Tech

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The potential catalytic performance of metalloporphyrins (MPs) for the hydrogenation of anthracene was investigated. The hydrogenation of anthracene with MPs, sulfur, or a combination of both was investigated. The MPs showed a small amount of catalytic activity for the hydrogenation reaction. Sulfur markedly improved the catalytic activity of the MPs. To probe demetalation of the MPs and the formation of catalytic species, conversions of the MPs were evaluated by UV/Vis spectroscopy. The solids formed in situ with α‐Al2O3 as a carrier during the hydrogenation with nickel tetraphenylporphyrin and sulfur were characterized by Raman, X‐ray photoelectron (XPS), and energy‐dispersive X‐ray spectroscopy (EDS). In the presence of sulfur, high conversions of the MPs were obtained. Raman spectroscopy, XPS, and EDS analyses suggested that the catalytic species were mixtures of different nickel sulfide phases with NiS as the main component. Thus, with the aid of sulfur, the MPs could be readily demetalated and then sulfided to catalytic species, and thus it is possible to activate inherent MPs to improve the hydroconversion of heavy oil.

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“…So the mixed phase of MoNi catalyst is better analyzed through other methods, such as TEM and XPS [10,15]. As shown in the TEM image of the MoNi catalyst after reaction (Figure 2(a)), nickel sulfides crystals were decorated with MoS2 layers, this suggested the NiMoS mixed phase existed in MoNi catalyst.…”

Section: Nimos Phase Of Catalyst After Reactionmentioning

confidence: 97%

Study of NiMoS mixed phase from catalyst precursors in residue slurry-bed hydrocracking

Du¹,

Deng²,

Li³

et al. 2017

AIP Conference Proceedings

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Abstract. The evolution and role of NiMoS structures from catalyst precursors on residue hydrocracking was investigated. NiMoS mixed phase played important roles in unsupported catalyst and heavy oil development, such as synergy effect and coke inhibiting. The oil-soluble molybdenum naphthenate and nickel naphthenate were chosen as catalyst precursors. The mixtures of the precursor were compared to those of other monometallic oil-soluble precursor in an effort to evaluate the evolution and role of NiMoS phase in the slurry bed hydrocracking of heavy oil. The presence of NiMoS phase were characterized by X-ray diffraction (XRD), TEM and XPS. The series of tests in the slurry-phase reactor was to confirm the synergy effect of NiMoS mixed phase.

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Catalyst Deactivation in Slurry-Phase Residue Hydroconversion

Cited by 32 publications

References 35 publications

Slurry-phase hydrocracking of heavy oil and model reactant: effect of dispersed Mo catalyst

Slurry-phase hydrocracking of heavy oil and model reactant: effect of dispersed Mo catalyst

The Catalytic Performance of Metalloporphyrins during Hydrogenation of Anthracene

Study of NiMoS mixed phase from catalyst precursors in residue slurry-bed hydrocracking

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