Oxidation kinetics of dibenzothiophenes using cumene hydroperoxide as an oxidant over MoO3/Al2O3 catalyst

Safa, Muhieddine A.; Ma, Xiaoxun

doi:10.1016/j.fuel.2015.12.050

Cited by 52 publications

(33 citation statements)

References 37 publications

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“…When the reaction temperature is tuned from 303 K to 323 K, the conversion of DBT is improved from 60.8 % to 99.0 % after a reaction time of 20 min. These results indicate that the increase of reaction temperature is helpful for enhancing the conversion of DBT …”

Section: Resultsmentioning

confidence: 80%

“…These results indicate that the increase of reaction temperature is helpful for enhancing the conversion of DBT. [35][36][37] The reaction rate data for the conversion of DBT over MOF-808(Zr)-H catalyst could be fitted well to a pseudo-first order rate law. As seen in Figure 4b, a linear plot of Ln (C 0 /C t ) versus reaction temperature could be obtained.…”

Section: Resultsmentioning

confidence: 99%

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Creation of Active Sites in MOF‐808(Zr) by a Facile Route for Oxidative Desulfurization of Model Diesel Oil

et al. 2020

ChemistrySelect

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MOF‐808(Zr) as an important member of metal‐organic frameworks (MOFs) has attracted much attention due to its good stability, large surface area and rich zirconium metal centers. However, Zr sites in the structure of MOF‐808(Zr) are inactive in many catalytic reactions due to they are well coordinated with organic ligands like 1,3,5‐benzenetricarboxylic acid (BTC) and formate anions. Thus, removing formate anions have been attempted to create more active sites in the structure for many reactions while maintaining the structural stability. In this work, we report that the formate ligands in MOF‐808(Zr) can be facilely removed by the treatment in hot ethanol for 4 h. The obtained material as a heterogeneous catalyst exhibited superior catalytic activity in the oxidative desulfurization (ODS) reaction of dibenzothiophene (DBT) compared with reported MOFs catalysts. The conversion of DBT in model diesel oil could reach >99 % within a reaction time of 20 min at 323 K, which is five times as that over parent MOF‐808(Zr). As a result, the sulfur content was decreased from 1000 ppm to less than 10 ppm. Such catalytic performance should be mainly attributed to the creation of more active sites in the structure of MOF‐808(Zr) after the removal of formate anions.

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Section: Resultsmentioning

confidence: 80%

Section: Resultsmentioning

confidence: 99%

Creation of Active Sites in MOF‐808(Zr) by a Facile Route for Oxidative Desulfurization of Model Diesel Oil

et al. 2020

ChemistrySelect

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“…Nevertheless, sulfur density values for these two molecules are very similar (Table 3). Others studies with model mixtures [50,55] showed these alkyl groups also induce a sulfur atom steric hindrance leading to ODS reactivity decrease [3].…”

Section: Tetrahydrodibenzothiophenementioning

confidence: 99%

Oxidative Desulfurization of Heavy Oils with High Sulfur Content: A Review

et al. 2018

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The demand for clean fuels is increasing throughout the world, with more stringent environmental regulations for transportation fuels including marine fuels, particularly regarding their sulfur content. Moreover, the quality of crude oil and derived petroleum cuts is getting lower while fossil fuels are still in high demand. Heavy oils are characterized by high sulfur content where most sulfur is found in bulky thiophenic structures difficult to remove using conventional high pressure hydrodesulfurization process. However they appeared more reactive in oxidative desulfurization (ODS) process, carried out at mild conditions without hydrogen pressure. This review focuses for the first time on the heavy fuels initially containing more than 0.5 wt.%S and upgraded by the ODS process. Different attractive approaches of the literature towards ODS are reported using homogeneous and heterogeneous catalysis. Recent developments in ODS assisted with ultrasound technology and the use of ionic liquid to enhance ODS efficiency will be fully detailed and discussed to better understand their viability when applied to high sulfur content, high viscosity, and high boiling point feeds.

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“…Despite the advancement of environment-friendly technologies, the transportation and energy industries still depend We selected molybdenum oxide because it has recently emerged as a promising material for the ODS of fuel, [16][17][18] with the ease of formation of the electrophilic molybdenum peroxo intermediate species identified as the driving force for the effective oxidation of the sulfur contaminants (Figure 2). [19] This intermediate is produced when an oxidant, such as hydrogen peroxide, reacts with the Lewis acidic sites of the metal oxide and leads to the formation of electrophilic species, essential to promote efficient ODS.…”

Section: Introductionmentioning

confidence: 99%

Molybdenum Dioxide in Carbon Nanoreactors as a Catalytic Nanosponge for the Efficient Desulfurization of Liquid Fuels

Astle

Rance

Loughlin

et al. 2019

Adv Funct Materials

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The principle of a "catalytic nanosponge" that combines the catalysis of organosulfur oxidation and sequestration of the products from reaction mixtures is demonstrated. Group VI metal oxide nanoparticles (CrO x , MoO x , WO x ) are embedded within hollow graphitized carbon nanofibers (GNFs), which act as nanoscale reaction vessels for oxidation reactions used in the decontamination of fuel. When immersed in a model liquid alkane fuel contaminated with organosulfur compounds (benzothiophene, dibenzothiophene, dimethyldibenzothiophene), it is found that MoO 2 @GNF nanoreactors, comprising 30 nm molybdenum dioxide nanoparticles grown within the channel of GNFs, show superior abilities toward oxidative desulfurization (ODS), affording over 98% sulfur removal at only 5.9 mol% catalyst loading. The role of the carbon nanoreactor in MoO 2 @GNF is to enhance the activity and stability of catalytic centers over at least 5 cycles. Surprisingly, the nanotube cavity can selectively absorb and remove the ODS products (sulfoxides and sulfones) from several model fuel systems. This effect is related to an adsorptive desulfurization (ADS) mechanism, which in combination with ODS within the same material, yields a "catalytic nanosponge" MoO 2 @GNF. This innovative ODS and ADS synergistic functionality negates the need for a solvent extraction step in fuel desulfurization and produces ultralow sulfur fuel.

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Oxidation kinetics of dibenzothiophenes using cumene hydroperoxide as an oxidant over MoO3/Al2O3 catalyst

Cited by 52 publications

References 37 publications

Creation of Active Sites in MOF‐808(Zr) by a Facile Route for Oxidative Desulfurization of Model Diesel Oil

Creation of Active Sites in MOF‐808(Zr) by a Facile Route for Oxidative Desulfurization of Model Diesel Oil

Oxidative Desulfurization of Heavy Oils with High Sulfur Content: A Review

Molybdenum Dioxide in Carbon Nanoreactors as a Catalytic Nanosponge for the Efficient Desulfurization of Liquid Fuels

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