Hydroprocessing of heavy gas oils using FeW/SBA-15 catalysts: Experimentals, optimization of metals loading, and kinetics study

Boahene, Philip; Soni, Kapil; Dalai, Ajay K.; Adjaye, John

doi:10.1016/j.cattod.2012.04.064

Cited by 20 publications

(13 citation statements)

References 48 publications

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“…Two pairs of decant oils, (1) EI-132 and EI-133 and (2) EI-134 and EI-135, were obtained at relatively similar LHSV while the temperature was progressively increasing. The results indicated that an increase in temperature favors the hydrodesulfurization (HDS) and hydrodenitrogenation (HDN), as expected and in agreement with Boahene et al, 24 Owusu-Boakye et al, 25,26 and Mapiour et al 27 The decant oils EI-137 and EI-138 were obtained using the same LHSV and pressure but changing the temperature. In this case, the decant oil EI-138, which was obtained at a lower temperature when compared to EI-137, reached comparable HDS level than EI-137 but a higher HDN.…”

Section: Discussionsupporting

confidence: 87%

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Characterization of Hydrotreated Decant Oils. Effect of Different Severities of Hydrotreating on Decant Oil Chemical Composition

2012

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Different severities of hydrotreatment were performed on a raw decant oil and one of its subsequent hydrotreated decant oils. Six hydrotreated decant oils with different chemical composition were obtained during this process. The products obtained from the raw decant oil showed difficulty in sulfur removal. Higher desulfurization was obtained after repassing the first drum of product (EI-132) at a reduced feed rate (LHSV 0.5h −1 ), higher temperature (734°F and 750°F), and higher reactor pressure (8.3 MPa). Several analyses were performed to characterize the decant oils: elemental analysis, 1 H and 13 C NMR, asphaltene content, average boiling point, API gravity, GC/MS, and viscosity. Two structural parameters derived from the 1 H NMR spectra and elemental analyses were calculated: aromaticity (fa) and the fraction of aromatic edge carbons carrying substituents (σ). All the information gathered from the different techniques was helpful to understand the chemical transformations taking place during hydrotreatment of decant oils. It was observed that hydrogenation of aromatic rings and hydrodealkylation were the dominant reactions in the severely hydrotreated decant oils (EI-137 and EI-138) while the formation of alkyl side chains was observed in the low and intermediate hydrotreated decant oils, (EI-133 and EI-134) and (EI-135 and EI-136), respectively.

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Section: Discussionsupporting

confidence: 87%

“…Boaehne et al 24 have reported that by decreasing the LHSV the extent of sulfur and nitrogen conversions is increased.…”

Section: Discussionmentioning

confidence: 98%

Characterization of Hydrotreated Decant Oils. Effect of Different Severities of Hydrotreating on Decant Oil Chemical Composition

2012

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“…Understanding of the reaction rates of the ARs for HDS, HDN, HDV, HDNi, HDAsp, and HDCCR over different catalyst beds is important for design of the catalyst and the catalyst bed. In many cases, the reaction rates for HDN, HDV, HDNi, HDAsp, and HDCCR can be described by the first-order kinetics, as indicated in the literature, ,,, although other order kinetics have also been reported, depending on the conversion and distribution of the reactant species with different reactivities. ,− The apparent HDS kinetics behavior can be described approximately by the first-order reaction, when liquid hourly space velocity (LHSV) is higher or the conversion is lower. , In principle, an individual compound in hydrotreating obeys mostly the first-order kinetics . In the real feed cases, the empirical reaction order for various compounds, such as S, N, V, Ni, and asphaltenes compounds, is usually estimated by the regression analysis to fit the experimental data.…”

Section: Resultsmentioning

confidence: 97%

Hydrotreating Reactivities of Atmospheric Residues and Correlation with Their Composition and Properties

Cui

Nakano

et al. 2018

Energy Fuels

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In order to better understand the effects of composition and properties of atmospheric residues (AR) on their reactivities for hydrodesulfurization (HDS), hydrodenitrogenation (HDN), hydrodevanadium (HDV), hydrodenickel (HDNi), hydrodeasphaltene (HDAsp), and hydrodeconradson-carbon-residue (HDCCR) in the hydrotreating process, analysis and characterization of three ARs (AA-AR, AB-AR, and AM-AR) from Arabia crudes were conducted, and their hydrotreating reactivities were evaluated in a pilot unit over a catalyst system at 370 °C under a H2 pressure of 13.5 MPa by comparing the conversions of the various species and their rate constants on each catalyst. The overall reactivity of various species decreases in the order of vanadium species > sulfur species ≈ asphaltenes > nickel species > Conradson carbon residue precursor > nitrogen species, regardless of the sources of the ARs. Reactivities of the three ARs in HDS, HDV, and HDAsp increase in the order of AB-AR < AA-AR < AM-AR, while reactivities of the three ARs in HDNi, HDCCR, and HDN are similar. The higher nitrogen and asphaltenes concentrations and larger density of AR have strong and negative effects on the HDS, HDV, and HDAsp reactivities but no significant effect on the HDN, HDNi, and HDCCR reactivities. The B parameter obtained from electron spin resonance analysis can be a good index to predict the HDV reactivity of AR.

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“…This in turn can reflect the superiority of the metallic Co catalysts that are revealed in this study owing to the reduction of the operational costs. On the other hand, the Fe/W catalysts that are discussed in refs , had shown lower sulfur removal percentages than the metallic Co catalysts although they were used at high temperatures and pressures. This obviously can verify the better performance by the metallic Co catalysts in comparison to that of some other catalysts reported in the literature.…”

Section: Resultsmentioning

confidence: 99%

New Approach for Catalytic Production of Ultralow-Sulfur Diesel Fuels Using Binary Composed Catalysts Consisting of Cobalt Nanoparticles

Naggar

Sayed

Salem

et al. 2020

Ind. Eng. Chem. Res.

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The global trend is orientated toward the production of diesel fuels composed of as low as 50 ppm (0.05 g/L) or even less sulfur compounds. As a result, the current study is orientated toward the generation of a diesel fuel with reduced sulfur content via the catalytic route. This research work introduces novel approaches in the catalytic desulfurization field through providing new perspectives. A special attention has been paid throughout this research toward the usage of advanced catalytic compositions in the sulfur removal application. Unlike the commonly known catalysts for the desulfurization processes that are basically metal oxides of different structures, catalysts with mixed structures are introduced in this study. Two novel cobalt catalysts based on metallic (zero-valent) and hydroxide structures were utilized to catalytically remove sulfur from the feedstock of the diesel fuel. The two catalysts were synthesized by the electroless deposition technique using two different reducers. The effect of these reducing agents on both the structure of the catalysts and their subsequent performance in the designated process was investigated. The diesel fuel manufactured in this study contains low content of sulfur; in addition to this, ultralow catalytic operational conditions had been other advances that have been concluded at the end of this work. Particularly, a temperature of 100 °C, liquid hour space velocity equals 1, and hydrogen-to-feed ratio of 100:1 were applied during the currently presented sulfur removal process. At these nonsevere conditions, approximately 90% of the sulfur compounds in original feedstock (10 000 ppm equivalent to 10 g/L) were eliminated at the generated diesel fraction in this research study. This sulfur removal rate was then elevated to reach 99.5% through an adsorption step using the spent catalyst, which had been acquired at the optimum conditions of the catalytic sulfur compounds’ removal process. Thus, the ultimate diesel fuel containing 50 ppm sulfur compounds was obtained by the presented treatment processes.

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Hydroprocessing of heavy gas oils using FeW/SBA-15 catalysts: Experimentals, optimization of metals loading, and kinetics study

Cited by 20 publications

References 48 publications

Characterization of Hydrotreated Decant Oils. Effect of Different Severities of Hydrotreating on Decant Oil Chemical Composition

Characterization of Hydrotreated Decant Oils. Effect of Different Severities of Hydrotreating on Decant Oil Chemical Composition

Hydrotreating Reactivities of Atmospheric Residues and Correlation with Their Composition and Properties

New Approach for Catalytic Production of Ultralow-Sulfur Diesel Fuels Using Binary Composed Catalysts Consisting of Cobalt Nanoparticles

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