Oxidative desulfurization of model diesel fuel catalyzed by carbon-supported heteropoly acids: Effect of carbon support

Ghubayra, Reem; Yahya, Rana; Kozhevnikova, Elena F.; Kozhevnikov, Ivan V.

doi:10.1016/j.fuel.2021.121083

Cited by 26 publications

(13 citation statements)

References 34 publications

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“…Typically, it includes their applications as standalone catalysts with intrinsic catalytic features, where available surface defects or acidic oxygen groups serve as the active centers, which is the focus of this review. Second, they could also be used in hybrid systems, where they act as co-catalysts or immobilization materials for ILs, such as polyoxometalate-based IL. , Common carbon–metal hybrid systems that have been reported include V, Mn, Fe, Pd, Mo, Ti, W [as oxide or phosphotungistic acid (HPW)], and CoMn oxides. − Similarly, carbon–heteropoly acids are among the widely reported hybrid systems. , Third, as a result of the hydrophilic and hydrophobic characteristics (amphiphilic nature) of most carbonaceous materials, they are also used to simultaneously enhance the interaction of ODS catalysts with both the H 2 O 2 oxidant phase and the S-containing compounds (such as DBT). The amphiphilic character of the carbon materials can be effectively tailored to adjust emulsion formation and stability for ODS facilitated under emulsified systems.…”

Section: Metal-free Catalytic Odsmentioning

confidence: 99%

Metal-Free Catalytic Oxidative Desulfurization of Fuels─A Review

Tanimu

Ganiyu

et al. 2022

Energy Fuels

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Overdependence of energy consumption around fossil fuels is threatening our environment from different anthropogenic emissions of pollutants. These pollutants (CO x , NO x , and SO x ) resulting from combustion activities of crude oil and petroleum products are life-threatening. Desulfurization of fuels is an important matter that constantly requires attention from the relevant stakeholders for environmental, economic, and social benefits. Hydrodesulfurization required to lower the sulfur content in the crude oil comes at high operating conditions and cost, especially toward achieving ultradeep desulfurization of <10 or 0 ppm as required for fuel cell catalytic converters. In the recent decades, oxidative desulfurization (ODS) is gaining fast interest among the few alternatives proposed as a complementary approach. This paper reviews the current advances in the metal-free catalytic ODS owing to the effectiveness and promising results in the light of safety, cost, and environmental concerns compared to conventional metal-containing catalytic ODS strategies. Special contributions related to graphitic materials, nitrides, carbides, ionic liquids, deep eutectic solvents, and porous organic polymers with respect to the broad classification of organic, inorganic, and hybrid (organic–inorganic) metal-free catalysts and their mechanism of catalyzing the oxidation process are thoroughly reviewed. The challenges, improvements, merits, and future prospects are discussed in the context of industrial feasibility for strategic plans and further studies.

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Section: Metal-free Catalytic Odsmentioning

confidence: 99%

Metal-Free Catalytic Oxidative Desulfurization of Fuels─A Review

Tanimu

Ganiyu

et al. 2022

Energy Fuels

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“…For most of the ODS processes, the reactivity of DBTs follows the order of DBT > MDBT > DMDBT > EDBT. [20][21][22][23][24][25] Their reactive difference roots from the steric effects arising from shielding effect of ortho-substituted alkyl chains on S atom. The steric effects, including bond angle deviation, intermolecular tension, steric hindrance, and so on, are mainly arisen from the overlapping electron cloud of the adjacent atoms and groups in a molecule.…”

Section: Introductionmentioning

confidence: 99%

“…At present, competitive oxidation of the coexistent constituents has been studied extensively, and it does reduce the ODS performance, but the influence can be diminished under optimal conditions. For most of the ODS processes, the reactivity of DBTs follows the order of DBT > MDBT > DMDBT > EDBT 20–25 . Their reactive difference roots from the steric effects arising from shielding effect of ortho‐substituted alkyl chains on S atom.…”

Section: Introductionmentioning

confidence: 99%

Steric effects of alkyl dibenzothiophenes: The root cause of frustrating efficacy of heterogeneous desulfurization for real diesel

Song

Meng

et al. 2022

AIChE Journal

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High-carbon alkyl dibenzothiophenes (DBTs) in real diesel are difficult to remove. Their steric effect has been studied and identified as the controlling factor in heterogeneous catalytic oxidation desulfurization (ODS) process. Mixed alkyl DBTs (C 2 -DBT, C 2 -C 2 -DBT, C 3 -DBT, and C 3 -C 3 -DBT) were synthesized via DBT's Friedel-Crafts alkylation, and their reactivity is DBTC 2 -C 2 -DBT, and C 3 -C 3 -DBT can be hardly removed by any of three efficient heterogeneous ODS processes, but are removed efficiently in a homogeneous ODS process of HAc-HPW-H 2 O 2 , which contrasts the great importance of their steric effects in heterogeneous catalytic process. Thus, the frustrating efficacy of various ODS processes for real diesel is likely originated from the unidentified high-carbon alkyl DBTs and their least reactivity in heterogeneous catalytic systems. And, the steric hindrance is diminished greatly in a homogeneous catalytic process. The results are instructive for the development of new catalysts and catalytic ODS processes for real diesel.

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“…10 The core of oxidative desulfurization is to select highly selective catalysts. Commonly used catalysts such as heteropolyacids, 11,12 ionic liquids, [13][14][15] metal oxides, 16,17 molecular sieves 18,19 and other inorganic materials 20,21 have been used to eliminate aromatic sulfur compounds in diesel. Molecular sieves stand out from many catalysts due to their better shape-selective catalytic performance and easy separation.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of hierarchical CoAPO‐5 catalysts in different fluoride medium and optimization of its catalytic oxidative desulfurization process

Zhao

Shao

et al. 2022

J of Chemical Tech & Biotech

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BACKGROUND Fluoride ions can form corresponding complexes with transition metal elements (Co, Ti, V, Cr, Mn, Fe, Ni, Cu, etc.), so it is easier to synthesize heteroatomic molecular sieves in a fluorine‐containing system than in a fluorine‐free system. RESULTS In this paper, a hierarchical CoAPO‐5 molecular sieve was synthesized in a fluorine system, and the effects of different fluorine resources on its synthesis were investigated. The CoAPO‐5 samples were characterized by X‐ray diffraction, scanning electron microscopy, N2 adsorption–desorption and temperature‐programmed desorption of NH3. CONCLUSION The results showed that, compared with other fluorine resources, the sample D‐AFI‐1 synthesized with HF possessed more acid sites, which appeared to be more attractive for oxidative desulfurization. The central composite design of response surface methodology was applied to design experimental schemes employing D‐AFI‐1 as catalyst. The volume ratio of oxidant/fuel, extractant/fuel and the mass ratio catalyst/fuel were screened out as the significant factors after the investigation of single factors. The quadratic model of the three significant factors and desulfurization rate was established. On the basis of optimizing the reaction conditions, oxidant/fuel volumetric ratio, catalyst/fuel mass ratio and extractant/fuel were 0.07 mL mL−1, 0.01 g g−1 and 1.65 mL mL−1, respectively, the desulfurization rate was 85.0%, which was consistent with the predicted value of the model (83.7%). © 2022 Society of Chemical Industry (SCI).

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Oxidative desulfurization of model diesel fuel catalyzed by carbon-supported heteropoly acids: Effect of carbon support

Cited by 26 publications

References 34 publications

Metal-Free Catalytic Oxidative Desulfurization of Fuels─A Review

Metal-Free Catalytic Oxidative Desulfurization of Fuels─A Review

Steric effects of alkyl dibenzothiophenes: The root cause of frustrating efficacy of heterogeneous desulfurization for real diesel

Synthesis of hierarchical CoAPO‐5 catalysts in different fluoride medium and optimization of its catalytic oxidative desulfurization process

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