Review of electrochemical oxidation desulfurization for fuels and minerals

Zhang, Tong; Zhang, Jintao; Wang, Zhi; Liu, Junhao; Qian, Guoyu; Wang, Dong; Gong, Xuzhong

doi:10.1016/j.fuel.2021.121562

Cited by 44 publications

(9 citation statements)

References 364 publications

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“…Thus, today, it is urgent to search for alternative non-hydrogen methods to reduce the sulfur content in oil products, allowing efficient desulfurization with minimal waste generation. The following anhydrous methods are known from the literature: extraction, , adsorption, , biodesulfurization, , and oxidative desulfurization. − Among these alternative approaches, the method of oxidative desulfurization attracts the greatest interest of researchers because of this technique’s capability of reducing the sulfur content in various petroleum fractions down to ultra-low values with sufficiently high selectivity . In this case, the reaction products, sulfones, can be selectively recovered and used in various industries and agriculture. , …”

Section: Introductionmentioning

confidence: 99%

New Type of Catalyst for Efficient Aerobic Oxidative Desulfurization Based On Tungsten Carbide Synthesized by the Microwave Method

et al. 2022

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Herein, we present a new type of high-performance catalyst for aerobic oxidation of organosulfur compounds based on tungsten carbide. The synthesis of tungsten carbide was performed via microwave irradiation of the precursors, which makes it possible to obtain a catalyst in just 15 min. The synthesized catalyst was investigated by a variety of physicochemical methods: X-ray diffraction, X-ray photoelectron spectroscopy, Raman spectroscopy, electron microscopy, and N 2 adsorption/desorption. It was shown that active centers containing tungsten in the transition oxidation state (+4) play a key role in the activation of oxygen. The main factors influencing the conversion of dibenzothiophene (DBT) were investigated. It should be noted that 100% conversion of DBT can be achieved under relatively mild conditions: 120 °C, 3 h, 6 bar, and 0.5% wt catalyst. The catalyst retained its activity for at least six oxidation/regeneration cycles. The simplicity and speed of synthesis of the proposed catalyst in combination with its high activity and stability open broad prospects for its further use both for oxidative desulfurization and for other reactions of aerobic oxidation of organic substrates.

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Section: Introductionmentioning

confidence: 99%

New Type of Catalyst for Efficient Aerobic Oxidative Desulfurization Based On Tungsten Carbide Synthesized by the Microwave Method

et al. 2022

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“…Electrochemical desulfurization can be performed in the form of electrooxidative or electroreductive desulfurization. Electrooxidative desulfurization, unlike electroreductive desulfurization, produces no H 2 S. , In electrooxidative desulfurization, the sulfur is oxidized into soluble sulfate . Different oxidants such as dissolved oxygen, O 2 – ·, HO·, H 2 O, H 2 O 2 , and valent metal ions exist in the water environment.…”

Section: Methods Assisted With Oxidative Desulfurization Of Liquid Fuelsmentioning

confidence: 99%

Section: Methods Assisted With Oxidative Desulfurization Of Liquid Fuelsmentioning

confidence: 99%

“…Electrooxidative desulfurization, unlike electroreductive desulfurization, produces no H 2 S. 158,159 In electrooxidative desulfurization, the sulfur is oxidized into soluble sulfate. 160 The advantages of ECODS include low temperature and pressure, no consumption of oxidants, the production of a small content of wastewater, lower energy requirements, and the control of desulfurization efficiency and products via the adjustment of various potential and proper current. 158,159 Furthermore, the selection of process schemes, reactors, electrocatalysts, electrolytes, and mediators makes the ECODS very flexible.…”

Section: Photocatalytic Oxidative Desulfurization the Photocatalytic ...mentioning

confidence: 99%

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Recent Advances and Challenges in Developing Technological Methods Assisting Oxidative Desulfurization of Liquid Fuels: A Review

2022

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To meet the requirements of sulfur standards, the desulfurization of liquid fuels is crucial. Oxidative desulfurization (ODS) has been widely employed to desulfurize liquid fuels. Various techniques can be combined with ODS to increase its efficiency. The present study surveys recent advances in the techniques of ultrasound-assisted oxidative desulfurization, plasma oxidative desulfurization, microwave-assisted oxidative desulfurization, hydrodynamic cavitation-assisted oxidative desulfurization, photocatalytic oxidative desulfurization, electrochemical oxidative desulfurization, magnetic field-assisted oxidative desulfurization, and bio-oxidative desulfurization. The advantages, drawbacks, and prospects of each method to desulfurize liquid fuels have been reviewed. All of these methods are in the research and development phases and often are at the laboratory stage. However, ultrasoundassisted ODS has been extensively investigated and its usage in industrial plants has been reported. The industrial applications of ODS and techniques assisted with ODS require more investigation.

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“…In the basic system, the following reactions mainly occur in the electrochemical desulfurization process [ 39 ]:…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Electrochemical Desulfurization of Coal Liquefaction Residue

Jiang

Zhang

et al. 2023

Molecules

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The occurrence of sulfur in coal direct liquefaction residue affects its further high quality and high value utilization. Electrochemical desulfurization is characterized by mild reaction conditions, simple operation, easy separation of sulfur conversion products and little influence on the properties of the liquefied residue. An anodic electrolytic oxidation desulphurization experiment was carried out on the liquefaction residue of the by-product of a coal-to-liquid enterprise in the slurry state. An electrochemical test and material characterization of raw materials before and after electrolysis showed that electrolytic oxidation can desulfurize the liquefaction residue under an alkaline condition. Linear sweep voltammetry (LSV) was used for the electrolysis experiments to obtain the optimal slurry concentration of 60 g/L. On this basis, the reaction kinetics were calculated, and the minimum activation energy in the interval at 0.9 (V vs. Hg/HgO) was 19.71 kJ/mol. The relationship between the electrolytic desulfurization of the liquefied residue and energy consumption was studied by the potentiostatic method. The influence of anodic potential and electrolytic temperature on the current density, cell voltage, desulfurization rate and energy consumption was investigated. The experimental results showed that the desulfurization rate and total energy consumption increase positively with the increase in reaction temperature and electrolytic potential in a certain range. The influence of the reaction temperature on the desulfurization rate and total energy consumption is more prominent than that of electrolytic potential, but the energy consumption of sulfur removal per unit mass does not show a positive correlation. Therefore, with the energy consumption per unit mass of sulfur removal as the efficiency index, the optimal experimental results were obtained: under the conditions of 0.8 (V vs. Hg/HgO) anode potential, 50 °C electrolytic temperature, 60 g/L slurry concentration and 14,400 s electrolytic time, the desulfurization rate was 18.85%, and the power consumption per unit mass of sulfur removal was 5585.74 W·s/g. The results of XPS, SEM, BET and IC showed that both inorganic and organic sulfur were removed by electrolytic oxidation, and the morphology, pore structure and chemical bond of the liquefied residue were affected by electrolytic oxidation. The research method provides a new idea and reference for the efficiency evaluation of desulfurization and hydrogen production from coal liquefaction residue.

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Review of electrochemical oxidation desulfurization for fuels and minerals

Cited by 44 publications

References 364 publications

New Type of Catalyst for Efficient Aerobic Oxidative Desulfurization Based On Tungsten Carbide Synthesized by the Microwave Method

New Type of Catalyst for Efficient Aerobic Oxidative Desulfurization Based On Tungsten Carbide Synthesized by the Microwave Method

Recent Advances and Challenges in Developing Technological Methods Assisting Oxidative Desulfurization of Liquid Fuels: A Review

Experimental Study on Electrochemical Desulfurization of Coal Liquefaction Residue

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