Oxidative removal of dibenzothiophene and related sulfur compounds from fuel oils under pressurized oxygen at room temperature with hydrogen peroxide and a phosphorus-free catalyst: sodium decatungstate

Hori, Hisao; Ogi, Keisuke; Fujita, Yuya; Yasuda, Yuta; Nagashima, Eri; Matsuki, Yusuke; Nomiya, Kenji

doi:10.1016/j.fuproc.2018.07.003

Cited by 17 publications

(4 citation statements)

References 44 publications

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“…[1,42] The following re-oxidation of the reduced DT to its starting state (catalysis cycling) and the formation of the oxygenated products can be achieved under the participation of O 2 . [44][45][46][47][48][49] The incorporating Mo, as supported by our present studies, plays key roles in improving the redox capacity and visible light harvesting efficiency of DT anion, especially in enhancing the photo-excited quantum efficiency (probability and lifetime). As a result, the visible-light-catalytic performance of Mo-DT can be improved significantly.…”

Section: Entrysupporting

confidence: 61%

Molybdenum Isomorphously Substituted Decatungstates as Robust and Renewable Photocatalysts for Visible Light‐Driven Oxidation of Hydrocarbons by Molecular Oxygen

et al. 2021

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This article reveals that molybdenum (Mo) heteroatoms isomorphously substituted decatungstates (Mo-DTs) can be conveniently synthesized via copolymerization of tungstate and molybdate in acidic solution. A series of characterizations support that the incorporated Mo heteroatoms play crucial roles in improving the redox capacity and visible light harvesting efficiency of Mo-DTs, especially the photo-excited probability and lifetimes, so that the novel Mo-DTs exhibit a remarkably enhanced photo-catalytic efficiency in the visiblelight-triggered selective oxidation of inert hydrocarbons by O 2 under mild conditions. In the photo-oxidation of cyclohexane under continuous visible light irradiation for 30 h, the best 1 % Mo-DT can achieve 44.8 % conversion and 89.7 % cyclohexanone selectivity in the presence of 2 M HCl, and the regenerated catalyst after simple hydrothermal treatment has excellent reusability. This is the first successful example of incorporating Mo atoms into the skeleton of non-lacunary DTs, which has special significance for expanding the application of DTs in visible-light-catalysis.

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Section: Entrysupporting

confidence: 61%

Molybdenum Isomorphously Substituted Decatungstates as Robust and Renewable Photocatalysts for Visible Light‐Driven Oxidation of Hydrocarbons by Molecular Oxygen

et al. 2021

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“…Deep sulfur removal issues are becoming more serious in refineries due to increased sulfur content in crude oil and lowered regulatory sulfur limits in petroleum products [1]. Combustion of organic sulfur compounds produce harmful and hazardous sulfur oxides, from fuel oils [2]. Heavy hydrocarbons derived from fossil fuel such as bitumen, oil sand and heavy oil contain very high amounts of sulfur.…”

Section: Introductionmentioning

confidence: 99%

Gasoil Hydro-desulfurization using Catalyst synthesized from Iraqi Kaolin Clay: Optimization with Response Surface Methodology (RSM)

AlKhafaji¹,

Shakor²,

Al-Zaidi³

et al. 2021

ETJ

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This search aim to study the feasibility of hydro-desulfurization (HDS) of gas oil in fixed bed reactor by using economic support catalyst alumina meta kaolin (AMK) under various operating condition, i.e. Temp. (240−320 ◦C), Press. (3–12 bar), WHSV (2–6 h−1) at H2/HC ratio (50 vol./vol.). The support catalyst was prepared from Iraq kaolin and characterization by using scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDAX) and Fourier transform infrared (FTIR) spectroscopy. Experimental design was used to determine which parameter (e.g. temperature, pressure and WHSV) has a greater influence on the obtained HDS and the optimum condition of process. The result shows that optimum condition given (Temp. 300 C, Press. 12 bar and WHSV 2 h-1) and all parameter have significant implication in the process.

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“…More importantly, aromatic sulfur-containing organic compounds (ASOCs), which constitute a large fraction of the S species in fuel oil, can be efficiently removed through ODS process under mild conditions, while in contrast, ASOCs are not easily eliminated through the HDS process due to steric hindrance. , Different types of catalysts, including supported metal oxide, − metal–organic-framework-based materials, − polyoxometalate, − molecular sieve TS-1, , mesoporous titanosilicate, − and so on, have been applied to ODS, and most reactions are performed at a temperature of 50 °C or higher to speed up the process. Some room temperature ODS catalysts have been reported; however, their activities remain unsatisfactory. − …”

Section: Introductionmentioning

confidence: 99%

Hierarchically Mesoporous Titanosilicate Single-Crystalline Nanospheres for Room Temperature Oxidative–Adsorptive Desulfurization

Wang

Shi

Chen

et al. 2019

ACS Appl. Nano Mater.

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Hierarchically mesoporous titanosilicate singlecrystalline nanospheres were synthesized by using a polyelectrolyte−surfactant mesomorphous complex templating method. The titanosilicate nanospheres possessed highly ordered mesopores (∼3 nm), interstitial secondary mesopores (6−20 nm), and a titanium content as high as 4.8 wt %. Owing to the nanoscale size, hierarchically mesoporous structure, and high Ti content, the hierarchically mesoporous titanosilicate nanospheres exhibited excellent oxidative desulfurization activity at room temperature (25 °C), with 100% conversion of dibenzothiophene (DBT) achieved within 5 min. More importantly, the titanosilicate nanospheres exhibited a strong adsorptive capacity toward the oxidation product, achieving an oxidative−adsorptive process for one-pot desulfurization of liquid hydrocarbon fuels. The oxidation desulfurization reaction at different temperatures followed pseudo-first-order kinetics, corresponding to an Arrhenius activation energy of 35.53 kJ/mol. Catalytic oxidation of benzothiophene (BT) and 4,6-dimethyldibenzothiophene (4,6-DMDBT), as well as thiophene (T) and 4-methyldibenzothiophene (4-MDBT), was also performed for which the catalyst exhibited excellent activity. The hierarchically mesoporous nanospherical titanosilicate catalyst can serve as a promising candidate for use in a onepot oxidation−adsorption desulfurization process.

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Oxidative removal of dibenzothiophene and related sulfur compounds from fuel oils under pressurized oxygen at room temperature with hydrogen peroxide and a phosphorus-free catalyst: sodium decatungstate

Cited by 17 publications

References 44 publications

Molybdenum Isomorphously Substituted Decatungstates as Robust and Renewable Photocatalysts for Visible Light‐Driven Oxidation of Hydrocarbons by Molecular Oxygen

Molybdenum Isomorphously Substituted Decatungstates as Robust and Renewable Photocatalysts for Visible Light‐Driven Oxidation of Hydrocarbons by Molecular Oxygen

Gasoil Hydro-desulfurization using Catalyst synthesized from Iraqi Kaolin Clay: Optimization with Response Surface Methodology (RSM)

Hierarchically Mesoporous Titanosilicate Single-Crystalline Nanospheres for Room Temperature Oxidative–Adsorptive Desulfurization

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