Oxidative desulfurization of diesel fraction with hydrogen peroxide in the presence of catalysts based on transition metals

Rakhmanov, E. V.; Tarakanova, A. V.; Валиева, Т; Akopyan, A. V.; Литвинова, В. В.; Максимов, А. Л.; Анисимов, А. В.; Vakarin, S. V.; Semerikova, O. L.; Zaikov, Yu. P.

doi:10.1134/s0965544114010101

Cited by 27 publications

(6 citation statements)

References 10 publications

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“…Для сравнения каталитической активности солей переходных металлов в присутствии пероксида водорода проводили опыты в одинаковых условиях. Эффективное соотношение Ме:S в процессе окислительного обессеривания моторных топлив достигнут в работе [10] Результаты показывают, что после проведения окислительного обессеривания дизельного топлива сокатализаторами в присутствии соединений переходного металла молибдата натрия некоторые физико-химические показатели изменились. Выявлено возрастание цетанового индекса с 56.3 до 58.6 в присутствии молибдата натрия с добавлением серной кислоты.…”

Section: результаты и их обсуждениеunclassified

Study of the Process of Oxidative Desulfurization of Diesel Fuel in the Presence of Co-Catalysts

Muktaly¹,

Мылтыкбаева²,

Smaiyl³

2021

Chem. J. of Kaz.

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Continuous growth in consumption of oil in the world, as well as ever-increasing quality requirements stimulate the search for new scientific and technological solutions to directionally affect the characteristics of petroleum products, including their chemical composition. The advantages of oxidative desulfurization before hydrotreating are the absence of the need to use hydrogen, as well as small capital and energy costs, since the method does not require high temperatures and pressures. The purpose of this work was to study the oxidation process of diesel fuel and to search for the optimal mode of oxidative desulfurization of diesel fuel in the presence of transition metals salts with the addition of mineral acids. The object of the study is a straight-run diesel fraction of the Pavlodar Petrochemical Plant with boiling temperatures of 180-350°C. The oxidation process was carried out with hydrogen peroxide in the presence of salts of the transition metals molybdenum, vanadium and tungsten. The article defined the basic physico-chemical characteristics of straight-run and desulfurized diesel fractions. The optimal catalyst (Na2MoO4) was selected at a molar ratio of metal to sulfur of 1:100 for the oxidation process of straight-run diesel fractions. As a result of oxidative desulfurization of diesel fuel in the presence of sodium molybdenum perox complexes, the total sulfur content decreased by 42.9%, and with the addition of sulfuric acid by 56.5%. An increase in the cetane index from 56.3 to 58.6 was revealed in the presence of sodium molybdate with the addition of sulfuric acid.

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Section: результаты и их обсуждениеunclassified

Study of the Process of Oxidative Desulfurization of Diesel Fuel in the Presence of Co-Catalysts

Muktaly¹,

Мылтыкбаева²,

Smaiyl³

2021

Chem. J. of Kaz.

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“…Transition-metal salts, , polyoxometallates, , molybdenum, and tungsten-containing ionic liquids , are widely used as catalysts since transition metals such as molybdenum, tungsten, and vanadium are capable of forming active peroxo complexes in the presence of oxidants. − At the same time, liquid-phase homogeneous catalysts have significant disadvantages: a small phase contact area and the complexity of regeneration. These problems can be solved by immobilizing the active component to heterogeneous supports. − In addition, the synergistic effect that occurs between molybdenum active sites and supports contributes to an increase in the efficiency of the oxidation rate, and as a result, milder reaction conditions. , …”

Section: Introductionmentioning

confidence: 99%

“…Hydrogen peroxide is an environmentally friendly oxidant (the only by-product is water), and unlike oxygen, does not require high temperatures during the oxidation process, which contributes to its widespread use. 2 Transition-metal salts, 8,14 polyoxometallates, 15,16 molybdenum, and tungsten-containing ionic liquids 17,18 are widely used as catalysts since transition metals such as molybdenum, tungsten, and vanadium are capable of forming active peroxo complexes in the presence of oxidants. 19−21 At the same time, liquid-phase homogeneous catalysts have significant disadvantages: a small phase contact area and the complexity of regeneration.…”

Section: Introductionmentioning

confidence: 99%

Combined Heterogeneous Catalyst Based on Titanium Oxide for Highly Efficient Oxidative Desulfurization of Model Fuels

et al. 2022

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In this work, new heterogeneous Mo-containing catalysts based on sulfonic titanium dioxide were developed for the oxidation of sulfur-containing model feed. The synergistic effect of molybdenum and sulfonic group modifiers allows for enhancing catalytic activity in dibenzothiophene oxidative transformation, and a strong interaction between support and active component for thus obtained catalysts provides increased stability for leaching. For the selected optimal conditions, the Mo/TiO2-SO3H catalyst exhibited 100% DBT conversion for 10 min (1 wt % catalyst, molar ratio of H2O2:DBT, 2:1; 80 °C). Complete oxidation of DBT in the presence of the synthesized catalyst is achieved when using a stoichiometric amount of oxidizing agent, which indicates its high selectivity. The enhanced stability for metal leaching was proved in recycling tests, where the catalyst was operated for seven oxidation cycles without regeneration with retainable activity in DBT-containing model feed oxidation with hydrogen peroxide under mild reaction conditions. In 30 min of the reaction (H2O2:S = 2:1 (mol), 0.5% catalyst, 5 mL of acetonitrile, 80 °C), it was possible to reduce the content of sulfur compounds in the diesel fraction by 88% (from 5600 to 600 ppm).

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“…Transition metal salts, in particular containing molybdenum, copper, vanadium, and tungsten, have become the most common catalysts for oxidation [13][14][15][16][17]. Such catalysts have become widespread due to their ability to form peroxocomplexes in the presence of hydrogen peroxide [7,18,19]. Interest in oxometallic catalysts is also growing [15].…”

Section: Introductionmentioning

confidence: 99%

Deep Oxidative Desulfurization of Fuels in the Presence of Brönsted Acidic Polyoxometalate-Based Ionic Liquids

et al. 2020

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Polyoxometalate-based ionic liquid hybrid materials with a pyridinium cation, containing Brönsted acid sites, were synthesized and used as catalysts for the oxidation of model and real diesel fuels. Keggin-type polyoxometalates with the formulae [PMo12O40]3−, [PVMo11O40]4−, [PV2Mo10O40]4−, [PW12O40]3− were used as anions. It was shown that increasing the acid site strength leads to an increase of dibenzothiophene conversion to the corresponding sulfone. The best results were obtained in the presence of a catalyst, containing a nicotinic acid derivative as cation and phosphomolybdate as anion. The main factors affecting the process consisting of catalyst dosage, temperature, reaction time, oxidant dosage were investigated in detail. Under optimal conditions full oxidation of dibenzothiophene and more than a 90% desulfurization degree of real diesel fuel (initial sulfur content of 2050 ppm) were obtained (the oxidation conditions: NK-1 catalyst, molar ratio H2O2:S 10:1, molar ratio S:Mo 8:1, 1 mL MeCN, 70 °C, 1 h). The synthesized catalysts could be used five times with a slight decrease in activity.

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Oxidative desulfurization of diesel fraction with hydrogen peroxide in the presence of catalysts based on transition metals

Cited by 27 publications

References 10 publications

Study of the Process of Oxidative Desulfurization of Diesel Fuel in the Presence of Co-Catalysts

Study of the Process of Oxidative Desulfurization of Diesel Fuel in the Presence of Co-Catalysts

Combined Heterogeneous Catalyst Based on Titanium Oxide for Highly Efficient Oxidative Desulfurization of Model Fuels

Deep Oxidative Desulfurization of Fuels in the Presence of Brönsted Acidic Polyoxometalate-Based Ionic Liquids

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