Insights into the effect of solvent on dibenzothiophene hydrodesulfurization

Wang, Bo; Zheng, Peng; Huili, Fan; Meng, Qian; Duan, Aijun; Chen, Zhentao; Chen, Xu

doi:10.1016/j.fuel.2020.119459

Cited by 16 publications

(12 citation statements)

References 65 publications

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“…To meet these parameters, the fuel industry resorts to hydrotreating processes such as hydrodesulfurization (HDS) and hydrodenitrogenation (HDN) [ 3 ]. However, these techniques are considerably unsustainable since they demand high economic and energetic costs, and they require high temperature (>350 °C) and pressure (up to 6MPa) conditions [ 3 , 4 ]. While N-based compounds are the most difficult to extract by HDN, the removal by HDS of some S-based compounds, such as benzothiophene derivatives, has also proven to be a difficult task [ 3 , 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

Ionic Liquid-Based Polyoxometalate Incorporated at ZIF-8: A Sustainable Catalyst to Combine Desulfurization and Denitrogenation Processes

et al. 2022

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An effective and sustainable process capable of simultaneously execute desulfurization and denitrogenation of fuels is in fact an actual necessity in the refinery industry. The key to achieve this goal is the parallel oxidation of sulfur and nitrogen compounds present in fuels, which is only achieved by an active and recovered catalyst. A novel heterogeneous catalyst was successfully prepared by the encapsulation of an imidazolium-based polyoxometalate (POM) into a ZIF-8 framework ([BMIM]PMo12@ZIF-8). This composite material revealed exceptional catalytic efficiency to concurrently proceed with the oxidative desulfurization and denitrogenation of a multicomponent model fuel containing various sulfur and nitrogen compounds. A complete removal of all these compounds was achieved after only one hour and the catalyst system was able to be reused for ten consecutive cycles without loss of efficiency. In fact, an ionic liquid POM was incorporated in the ZIF-8 for the first time, and this composite compound was originally applied as a catalyst for simultaneous oxidative desulfurization and denitrogenation processes.

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Section: Introductionmentioning

confidence: 99%

Ionic Liquid-Based Polyoxometalate Incorporated at ZIF-8: A Sustainable Catalyst to Combine Desulfurization and Denitrogenation Processes

et al. 2022

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“…The standard industrial methods for the removal of sulfur and nitrogen-based compounds from crude oils are hydrodesulfurization (HDS) and hydrodenitrogenation (HDN) [9,10]. HDS is an effective process that needs high temperature (>350 • C) and pressure (up to 6 MPa), and also requires high amounts of hydrogen consumption [11][12][13]. SCs and NCs in fuels are converted to hydrogen sulfide and ammonia, respectively, via the catalytic reduction with H 2 [14] In the HDS process, NCs severely affect the catalyst and cause corrosion of the refinery equipment due to their high reactivity [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Removing Simultaneously Sulfur and Nitrogen from Fuel under a Sustainable Oxidative Catalytic System

Silva

Viana

Mirante

et al. 2021

Sustainable Chemistry

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An effective process to remove nitrogen-based compounds from fossil fuels without harming the process of sulfur removal is an actual gap in refineries. A success combination of desulfurization and denitrogenation processes capable of completely removing the most environmental contaminates in diesel under sustainable conditions was achieved in this work, applying polyoxometalates as catalysts, hydrogen peroxide as oxidant, and an immiscible ionic liquid as an extraction solvent. The developed process based in simultaneous oxidative desulfurization (ODS) and oxidative denitrogenation (ODN) involved initial extraction of sulfur and nitrogen compounds followed by catalytic oxidation. Keggin-type polyoxomolybdates revealed much higher reusing capacity than the related polyoxotungstate. Effectively, the first catalysts practically allowed complete sulfur and nitrogen removal only in 1 h of reaction and for ten consecutive cycles, maintaining the original catalyst and ionic liquid samples.

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“…Therefore, they were chosen as model compounds to investigate the effects of the molecule size. Tetradecane was used to dissolve the sulfur compounds due to the high boiling point and the elimination of the competition effect on the catalyst active sites based on our previous research 18 . Catalytic evaluation experiments were performed in a high‐pressure fixed‐bed reactor.…”

Section: Methodsmentioning

confidence: 99%

“…Our previous results showed that the catalyst with a pellet size of 80-100 mesh was small enough to eliminate the internal diffusion effects. 18,38 Therefore, 80-100 mesh catalysts were utilized in this study, while the other operating conditions were the same as those in the apparent reactions. A good linear relationship of HDS efficiencies to the m/F values is shown in Figure 10B.…”

Section: Intrinsic Hds Reaction Of Dbtsmentioning

confidence: 99%

Restrictive diffusion and hydrodesulfurization reaction of dibenzothiophenes over NiMo/SBA‐15 catalysts

et al. 2022

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Macromolecular organosulfur compounds encountered resistance when diffusing in catalyst pore channels during the hydrotreating process. Quantitative insights into the effects of the catalyst pore size and the reactant molecule size on the diffusivities can guide the optimization of the catalyst structures. Herein, a heavy oil macromolecular dibenzothiophene compound, 2,8-di-(4-pentyl phenyl)dibenzothiophene (2,8-DPPDBT), was synthesized. Three NiMo-supported SBA-15 based catalysts with different pore sizes, but similar active phase dispersions were controllably fabricated. The reaction network of 2,8-DPPDBT HDS was proposed. The diffusion behaviors of 2,8-DPPDBT, along with 2,8-dimethyl dibenzothiophene (2,8-DMDBT) and dibenzothiophene (DBT) in three SBA-15 pore channels, were systematically investigated through the reaction kinetic method. A restrictive factor, F(λ), was correlated by F(λ) = (1 À λ) 8.5 to determine the relationship between the effective diffusivity and the ratio of the molecule-to-pore size (λ). This empirical correlation provided sound theoretical guidance on the design of highly efficient heavy oil hydrodesulfurization catalysts.

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Insights into the effect of solvent on dibenzothiophene hydrodesulfurization

Cited by 16 publications

References 65 publications

Ionic Liquid-Based Polyoxometalate Incorporated at ZIF-8: A Sustainable Catalyst to Combine Desulfurization and Denitrogenation Processes

Ionic Liquid-Based Polyoxometalate Incorporated at ZIF-8: A Sustainable Catalyst to Combine Desulfurization and Denitrogenation Processes

Removing Simultaneously Sulfur and Nitrogen from Fuel under a Sustainable Oxidative Catalytic System

Restrictive diffusion and hydrodesulfurization reaction of dibenzothiophenes over NiMo/SBA‐15 catalysts

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