Kinetics of Promotional Effects of Oil-Soluble Dispersed Metal (Mo, Co, and Fe) Catalysts on Slurry Phase Hydrocracking of Vacuum Gas Oil

Bdwi, Emad A. S.; Ali, Syed A.; Quddus, Mohammad R.; Al-Bogami, Saad A.; Razzak, Shaikh A.; Hossain, Mohammad M.

doi:10.1021/acs.energyfuels.6b03322

Cited by 35 publications

(56 citation statements)

References 28 publications

(49 reference statements)

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“…The appearance of distinguishable peaks between 400 and 450 cm −1 demonstrates that the metal catalyst precursor derived from for both catalytic configurations were successfully transferred to their active metal sulfide phase. 23 The dispersion of the water/oil-soluble precursors in the feed LVGO was screened by analyzing their SEM images. Figure 3 shows that the oil-soluble precursor is better scattered throughout the image; however, the water-soluble precursor tends to form agglomerations at a lower scattering degree.…”

Section: Resultsmentioning

confidence: 99%

Hydrocracking of LVGO Using Dispersed Catalysts Derived from Soluble Precursors: Performance Evaluation and Kinetics

Al-Rashidy

Al‐Attas

Ali

et al. 2019

Ind. Eng. Chem. Res.

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The promotional effects of dual water-soluble and bimetallic oil-soluble precursors for LVGO hydrocracking were investigated. The water-soluble Fe-Mo precursor caused a reduction in naphtha and coke yields, while the bimetallic oil-soluble layered ammonium nickel molybdate (Ni-LTM) catalyst precursor reduced the coke deposition without affecting the naphtha yield. The synergistic effects of Ni-LTM were investigated by employing it as a cocatalyst with a Ni-W/Al2O3-SiO2 catalyst. Ni-LTM significantly decreased the coke deposition on the supported catalyst as noticed by the SEM images. A five-lump discrete reaction scheme was found suitable for the kinetic modeling of LVGO hydrocracking over the cocatalytic system. The estimated kinetic parameters show that LVGO has a higher probability of being converted to naphtha than distillate, which explains the high selectivity of naphtha compared to the other pseudoproducts. The catalyst decay constant decreased with the process severity indicating an enhancement of hydrogenation by the dispersed catalysts.

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Section: Resultsmentioning

confidence: 99%

Hydrocracking of LVGO Using Dispersed Catalysts Derived from Soluble Precursors: Performance Evaluation and Kinetics

Al-Rashidy

Al‐Attas

Ali

et al. 2019

Ind. Eng. Chem. Res.

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“…This liquid composition can be used to generate kinetic models based on lumping approach. The literature reports some lumping kinetic models for heavy oil hydrocracking that have been reviewed elsewhere. − All of the literature kinetic models were obtained with experimental data at severe operating conditions using nonmineral catalyst, which include various liquid lumps and gases and coke produced by several reaction pathways from the liquid fractions.…”

Section: Introductionmentioning

confidence: 99%

Using Separate Kinetic Models to Predict Liquid, Gas, and Coke Yields in Heavy Oil Hydrocracking

Félix

2019

Ind. Eng. Chem. Res.

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A kinetic model based on distillation curves for predicting the liquid fractions composition (residue, vacuum gas oil, middle distillates, and naphtha) in heavy crude oil hydrocracking was developed, whereby the yield of each liquid fraction can be calculated. The experiments were carried out in a 1.8 L batch reactor at reaction temperature of 360−400 °C, hydrogen pressure of 3.9 MPa, and reaction times of 2−5 h, using a heavy crude oil as feed and mineral catalyst. This kinetic model was combined with another one based on SARA, gas, and coke composition, and with both models the yield of the different liquid fractions, gas, and coke can be predicted with good accuracy. Based on the values of the reaction rate coefficients, it was determined that some reaction pathways do not occur at low temperature. The average absolute error between experimental and calculated composition was lower than 3.3% indicating the high accuracy of the proposed kinetic model.

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“…In this regard, the lumped kinetics modelling approach is useful to determine the apparent kinetics parameters without following the detailed mechanism of the complex reactions [40] . The lumping kinetics modelling is commonly used in heavy oil upgrading by using discrete or continuous approaches [52,53] . However, the co‐gasification of carbonaceous material with glucose follows different techniques of lumping that apply the n th ‐order kinetic models which are given by: [46]

true \frac{d α}{d t} = k f ((), α)

…”

Section: Resultsmentioning

confidence: 99%

Apparent Kinetics of Co‐Gasification of Biomass and Vacuum Gas Oil (VGO)

Al‐Attas

Lucky

Hossain

2021

Chemistry An Asian Journal

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This communication reports the beneficial effects of co‐gasification of biomass and residual oil to produce syngas. In this regard, various blends of glucose (a biomass surrogate) to vacuum gas oil (VGO) have been employed to investigate the synergic effects on the gasification process. The non‐isothermal co‐gasification experiments were conducted in a thermogravimetric analyzer at different heating rates and gasifying agents. The analysis showed that the co‐gasification rate increased with the increase of glucose content in the feedstock. The presence of the oxygen in the biomass molecules helped the overall gasification process. The maximum gasification rate of 42.70 wt/min (DTGmax) was observed with 25 wt% glucose containing sample. The use of gasifying agents appeared to have some influence, especially during high temperature gasification of the glucose‐VGO blends. At a same gasification temperature, the co‐gasification rate of glucose‐VGO blends were found to be 125.7 wt/min and 98.59 wt%/min for N2 and CO2, respectively. The kinetics of the co‐gasification of glucose‐VGO blends was conducted based on modified random pore model using TGA experimental data and implemented in MATLAB. The estimated activation energy and rate constants were found to be consistent to the observed co‐gasification rates. The apparent activation energies of co‐gasification of VGO/biomass blends with different weight percentages shows values ranging 60.56–48.25 kJ/mol. The kinetics analysis suggested that the addition of biomass helped to increase the reaction rate by lowering the activation energy required for accomplishing the reactions compared with petroleum carbonaceous feedstocks. The reaction rate constants isotherms are plotted to show that the k‐values are exhibiting similar trends at moderate heating rates between 20 and 60 °C/min. This remark arises due to the nature of the reactions involved which are considered to be inherently similar in this range of heating rate.

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Kinetics of Promotional Effects of Oil-Soluble Dispersed Metal (Mo, Co, and Fe) Catalysts on Slurry Phase Hydrocracking of Vacuum Gas Oil

Cited by 35 publications

References 28 publications

Hydrocracking of LVGO Using Dispersed Catalysts Derived from Soluble Precursors: Performance Evaluation and Kinetics

Hydrocracking of LVGO Using Dispersed Catalysts Derived from Soluble Precursors: Performance Evaluation and Kinetics

Using Separate Kinetic Models to Predict Liquid, Gas, and Coke Yields in Heavy Oil Hydrocracking

Apparent Kinetics of Co‐Gasification of Biomass and Vacuum Gas Oil (VGO)

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