The usage of high metal feedstock for the determination of metal capacity of ARDS catalyst system by accelerated aging tests

Marafi, A.; Almarri, Masoud; Stanislaus, A.

doi:10.1016/j.cattod.2007.10.097

Cited by 18 publications

(17 citation statements)

References 19 publications

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“…According to Marafi et al (2008), autocatalysis became evident after the steady-state activity of catalyst was attained. After gradually reaching a maximum, the activity was slowly approaching a steady-state level.…”

Section: Resultsmentioning

confidence: 98%

“…The best fit was obtained for second-order kinetics in agreement with other studies (Marafi et al, 2003b;Marafi et al, 2008). These rate constants were used for the estimate of activation energies according to Arrhenius law.…”

Section: Resultsmentioning

confidence: 98%

“…The rates of HDAs and HDV followed identical trends suggesting that most of the V was removed after disintegration of asphaltenes entities. The active metals, free γ -Al 2 O 3 ), used for hydroprocessing Kuwait atmospheric residue under typical operating conditions exhibited some activity for HDS, HDAs, HDV, and HDNi, even after 1,000 h on stream (Marafi et al, 2008). This activity could not be attributed to γ -Al 2 O 3 ) because of its inability to generate active hydrogen (Breysse et al, 2002).…”

Section: Introductionmentioning

confidence: 93%

“…It was reported that this portion of the metals exhibited catalytic activity for some hydroprocessing reactions (Marafi et al, 2008;e.g., after the initial rapid deactivation of catalyst, the rate of HDS began to increase to a maximum and then gradually decreased to the steady-state level). At the maximum, the rate was almost 50% higher than the steady state rate.…”

Section: Introductionmentioning

confidence: 99%

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Evidence for Autocatalysis and Its Implications for the Kinetics of Hydroprocessing of Petroleum Residues

Al-Dalama

Stanislaus

Navvamani

et al. 2014

Petroleum Science and Technology

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During hydroprocessing of residual feeds the rate of some reactions tends to increase temporarily despite the continuous deposition of coke and metals on catalyst surface. This rate increase has been attributed to catalytic effect of the contaminant metals such as vanadium and nickel in residual feeds after their deposition on catalyst surface. The portion of metals that deposited on the bare γ -Al 2 O 3 surface of the catalysts transfers the originally inactive surface to catalytically active. The increase in the rate of HDS, HDAs, and some HDM reactions could only be reconciled assuming the involvement of autocatalysis by the deposited metals.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Evidence for Autocatalysis and Its Implications for the Kinetics of Hydroprocessing of Petroleum Residues

Al-Dalama

Stanislaus

Navvamani

et al. 2014

Petroleum Science and Technology

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“…5 years in an industrial unit. On the other hand, various strategies can be found in the literature to accelerate the precoking of the hydrotreating catalysts, which consist of increasing LHSV, temperature elevation, use of feeds with high metal content, or a combination of these factors. − However, none of the accelerated aging strategies are capable of fully representing practical deactivation. Therefore, as long-term coke deposition does not influence the reaction scheme and the aim of this work is to establish a scheme capable of reproducing the hydrocracking route, the inclusion of a coke lump in the model is not required.…”

Section: Resultsmentioning

confidence: 99%

Kinetic Modeling of Hydrotreating for Enhanced Upgrading of Light Cycle Oil

Palos

Gutiérrez

Hita

et al. 2019

Ind. Eng. Chem. Res.

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The hydrotreating of light cycle oil (LCO) into high-quality fuels has been investigated experimentally and kinetically, developing a model that accounts for the main and simultaneous reaction pathways: hydrodesulfurization (HDS), hydrodearomatization (HDA), and hydrocracking (HC). The experiments have been carried out in a fixed-bed reactor, NiMo/SiO2–Al2O3 commercial catalyst, 320–400 °C; 80 bar; space time, 0–0.5 gcat h gLCO –1; and H2/LCO volumetric ratio of 1000 Ncm3 cm–3. The proposed kinetic model contains multiple lumps, species, and pathways, leading to the faithful prediction of hydrotreatment products from different viewpoints. The computed kinetic parameters have allowed for simulating the process and seeking the optimal operating conditions. This way, the maximum values obtained for the conversions of HDS, HDA, and HC have been of 90%, 20%, and 65%, respectively; whereas a good compromise between the different hydrotreating goals has been obtained in the 385–400 °C range for a space time of 0.2 gcat h gLCO –1. Finally, the obtained optimal operating conditions have been compared with those optimized in the literature.

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Transformation of petroleum asphaltenes in supercritical alcohols—A tool to change H/C ratio and remove S and N atoms from refined products

2019

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The usage of high metal feedstock for the determination of metal capacity of ARDS catalyst system by accelerated aging tests

Cited by 18 publications

References 19 publications

Evidence for Autocatalysis and Its Implications for the Kinetics of Hydroprocessing of Petroleum Residues

Evidence for Autocatalysis and Its Implications for the Kinetics of Hydroprocessing of Petroleum Residues

Kinetic Modeling of Hydrotreating for Enhanced Upgrading of Light Cycle Oil

Transformation of petroleum asphaltenes in supercritical alcohols—A tool to change H/C ratio and remove S and N atoms from refined products

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