Heterogeneous oxidative desulfurization catalysed by titanium grafted mesoporous silica nanoparticles containing tethered hydrophobic ionic liquid: A dual activation mechanism

Cruz, Paula; Granados, Elizabeth-Adriana; Fajardo, Mariano; Hierro, Isabel del; Pérez, Yolanda

doi:10.1016/j.apcata.2019.117241

Cited by 14 publications

(5 citation statements)

References 51 publications

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“…The literature describes examples of the successful synthesis of hydrophobized silicates such as MCM-41 and SBA-15. − The described methods of hydrophobization of the surface of mesoporous silicates are mainly based on the interaction of surface silanol groups with silanes containing alkyl tails or with ionic liquids, most often based on imidazole. The use of alkyl-containing silanes allowed not only to minimize the filling of the pores with oxidation products but also to reduce the oxidation temperature.…”

Section: Introductionmentioning

confidence: 99%

Model Fuel Oxidation in the Presence of Molybdenum-Containing Catalysts Based on SBA-15 with Hydrophobic Properties

et al. 2021

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We have studied for the first time the role of hydrophobicity of the mesoporous silicate SBA-15 on the activity and the service life of a catalyst in the peroxide oxidation of sulfurcontaining compounds. Immobilization of the molybdate anion on the SBA-15 support via ionic bonding with triethylammonium groups allows us not only to decrease the reaction temperature to a relatively low value of 60 °C without a drop in the dibenzothiophene conversion degree but also to increase the service life of the catalyst to many times that of the known analogs. The support and catalyst structures were investigated by lowtemperature nitrogen adsorption/desorption, Fourier-transform infrared spectroscopy, X-ray fluorescence analysis, and transmission electron microscopy. Immobilization of the molybdate anion on the SBA-15 support, modified with ammonium species, prevents the leaching of active sites. However, only alkylsubstituted ammonium species minimize DBT sulfone adsorption, which significantly increases the catalyst's service life. The synthesized catalyst Mo/Et 3 N-SBA-15 with hydrophobic properties is not sensitive to the initial sulfur content and hydrogen peroxide amount and retains its activity for at least six cycles of oxidation without regeneration. These catalysts can be efficiently used for clean fuel production.

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Section: Introductionmentioning

confidence: 99%

Model Fuel Oxidation in the Presence of Molybdenum-Containing Catalysts Based on SBA-15 with Hydrophobic Properties

et al. 2021

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“…Mesoporous materials can overcome the pore size restriction of zeolites and permit the diffusion of large-size organosulfur molecules into their mesopores. Especially, mesoporous silica materials, such as MCM-41, MCM-48, and SBA-15, have shown prominent activities for ODS of 4,6-dimethyldibenzothiophene and dibenzothiophene molecules that are too large to fit into the micropores of zeolites. − Besides, mesoporous materials possess a high specific surface area and large pore volume, which are suitable to provide highly dispersed nanoparticle catalytic sites …”

Section: Introductionmentioning

confidence: 99%

Oxidative Desulfurization of Heavy Gas Oil over a Ti–TUD-1-Supported Keggin-Type Molybdenum Heteropolyacid

2020

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Catalytic oxidative desulfurization (ODS) is emerging as a potential alternative to deep hydroprocessing as a result of its milder operating conditions and no hydrogen requirements. In this study, ODS catalysts based on a mesoporous TUD-1 support were developed to overcome the diffusion limitation of zeolite-based catalysts in oxidizing large-size organosulfur compounds present in real petroleum feedstocks. Different mesoporous oxidation catalysts were formed by substituting Ti in the TUD-1 framework and impregnating Keggin molybdenum heteropolyacid (HPA) on the TUD-1 support. The mesoporosity of TUD-1 and the presence of Ti(IV) and Mo Keggin units in the prepared catalysts were confirmed from the characterization results of X-ray diffraction, X-ray photoelectron spectroscopy, X-ray absorption near edge structure, and Brunauer−Emmett−Teller N 2 surface area analyses. The ODS performance of catalysts was studied using a mild hydrotreated bitumen-derived heavy gas oil feedstock. The HPA-dispersed Ti−TUD-1 catalyst was found to be most active for desulfurizing the heavy gas oil feedstock as a result of a strong synergy effect of Ti and Mo Keggin ions on catalyzing oxygen transfer from an oxidant to a substrate. Oxidants, such as hydrogen peroxide, cumene hydroperoxide, tert-butyl hydroperoxide, and molecular oxygen, were screened in this study. The first two oxidants were better than others and equally efficient. The HPA/Ti−TUD-1 catalyst was found to be suitable for ODS and oxidative denitrogenation (ODN) in both the batch stirred-tank reactor and continuous fixed-bed reactor systems.

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“…Ionic liquids (ILs) oxidative desulfurization system has begun to enter eld of vision. [22][23][24][25][26][27] But ILs are expensive, tough to purify, and low biodegradable. It is vital to investigate a novel type of green solvents.…”

Section: Introductionmentioning

confidence: 99%

Ternary choline chloride/benzene sulfonic acid/ethylene glycol deep eutectic solvents for oxidative desulfurization at room temperature

Fan,

Yang,

et al. 2023

RSC Adv.

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Heterogeneous oxidative desulfurization catalysed by titanium grafted mesoporous silica nanoparticles containing tethered hydrophobic ionic liquid: A dual activation mechanism

Cited by 14 publications

References 51 publications

Model Fuel Oxidation in the Presence of Molybdenum-Containing Catalysts Based on SBA-15 with Hydrophobic Properties

Model Fuel Oxidation in the Presence of Molybdenum-Containing Catalysts Based on SBA-15 with Hydrophobic Properties

Oxidative Desulfurization of Heavy Gas Oil over a Ti–TUD-1-Supported Keggin-Type Molybdenum Heteropolyacid

Ternary choline chloride/benzene sulfonic acid/ethylene glycol deep eutectic solvents for oxidative desulfurization at room temperature

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