Catalytic Hydrodemetallation of Petroleum

Quann, Richard J.; Ware, Robert A.; Hung, Chi-Wen; Wei, James Cheng‐Chung

doi:10.1016/s0065-2377(08)60101-5

Cited by 107 publications

(82 citation statements)

References 135 publications

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“…As illustrated in Fig. 9, the hydrodemetallation activity rapidly drops during the first 30 h on stream, but then it stabilizes and starts a much slower deactivation process, as previously described in the literature [2]. The carbon accumulation measured after a 60 h reaction period, followed by toluene extraction and vacuum drying, was only 0.8 wt.% C. To compare the aged samples with fresh samples, we wanted to eliminate the initial short-term activity.…”

Section: Resultsmentioning

confidence: 80%

“…The shape of these profiles is due to the nature of the demetallation reaction, which occurs though a consecutive mechanism. As proposed by Quann et al [2], this mechanism starts with the formation of a metal-depositing intermediate resulting from the interaction of the metalloporphyrins with the surface, and it is then followed by the accumulation of metals. Therefore, as the metalloporphyrin penetrates the pore, it starts a conversion process that eventually ends in the deposition of the metal.…”

Section: M-shaped Profilesmentioning

confidence: 94%

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Deactivation of Ni–Mo/Al2O3 catalysts aged in a commercial reactor during the hydrotreating of deasphalted vacuum residuum

Isaza

Pachon

Viatcheslav

et al. 2000

Applied Catalysis A: General

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A series of Ni-Mo/Al 2 O 3 catalysts for the hydrotreating of deasphalted vacuum bottoms has been investigated as fresh catalysts and after aging in an industrial reactor during a typical commercial run. Several structural parameters have been varied in the catalyst series. In particular, pore size, surface area, active metal loading and pellet size were changed to investigate the role of kinetic and diffusional phenomena present in this process. The samples were placed in different locations along the industrial reactor allowing for a comparative analysis of the different samples under varying environments, since along the reactor, quality, temperature, and H 2 partial pressure continuously change.Fresh and aged samples were analyzed by a variety of techniques, which include atomic adsorption, scanning electron microscopy, X-ray microanalysis, BET, thermogravimetry and temperature-programmed oxidation. In addition, a laboratory trickle-bed reactor was used to compare the catalytic activity of fresh samples with the residual activity retained by the aged samples after the commercial run.These catalysts deactivate by accumulation of metals and, to a lesser extent, coke deposition. These effects are governed by a competition of kinetic and diffusional phenomena. The kinetic phenomena, which involve adsorption and decomposition of metal-bearing compounds are mainly related to the active metal content and overall surface area of the catalyst, while the diffusion of the molecules inside the pellet are controlled by pore size distribution and pellet size. The current contribution shows how this type of comparative study can be used to identify the most appropriate catalyst configuration for a given set of reaction conditions and feedstock quality.

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Section: Resultsmentioning

confidence: 80%

Section: M-shaped Profilesmentioning

confidence: 94%

Deactivation of Ni–Mo/Al2O3 catalysts aged in a commercial reactor during the hydrotreating of deasphalted vacuum residuum

Isaza

Pachon

Viatcheslav

et al. 2000

Applied Catalysis A: General

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show abstract

“…Regarding the metals, mostly Ni and V, they are present mainly in resins and asphaltenes in the form of porphyrinic or non-porphyrinic compounds [9,10]. The proportion in the residue of each type of structures varies greatly with the petroleum origin [11]. Sulfur, the most abundant heteroatom in petroleum is mainly present in all the different types of structures, mainly in forms such as sulfoxides or thiophenes [12].…”

Section: Introductionmentioning

confidence: 99%

Hydrodesulfurization and hydrodemetallization of different origin vacuum residues: Characterization and reactivity

Ferreira

Tayakout‐Fayolle

Guibard

et al. 2012

Fuel

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“…Neben der Verkokung stellen auch die Abscheidung von Metallen (Fe, Cu, Ni, Cr, V, As, Pd) [74,75] sowie die Änderung der Dispersität und Partikelgröße der Aktivkomponenten weitere Ursachen der Katalysatordesaktivierung dar. Bei hohen Reaktionstemperaturen werden metallorganische Verbindungen in der Katalysatoroberfläche abgebaut und durch im Einsatzgemisch enthaltenen H 2 S sulfidiert.…”

Section: Katalysatorregenerierungunclassified

Hydroraffinationskatalysatoren in der Erdölverarbeitung – Stand und Perspektiven

Reschetilowski

2007

Chemie Ingenieur Technik

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Catalytic Hydrodemetallation of Petroleum

Cited by 107 publications

References 135 publications

Deactivation of Ni–Mo/Al2O3 catalysts aged in a commercial reactor during the hydrotreating of deasphalted vacuum residuum

Deactivation of Ni–Mo/Al2O3 catalysts aged in a commercial reactor during the hydrotreating of deasphalted vacuum residuum

Hydrodesulfurization and hydrodemetallization of different origin vacuum residues: Characterization and reactivity

Hydroraffinationskatalysatoren in der Erdölverarbeitung – Stand und Perspektiven

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