Catalytic oxidative desulfurization of DBT using green catalyst (Mo/MCM-41) derived from coal fly ash

Sikarwar, Prerana; Kumar, U. K. Arun; Gosu, Vijayalakshmi; Subbaramaiah, Verraboina

doi:10.1016/j.jece.2018.02.021

Cited by 119 publications

(55 citation statements)

References 44 publications

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“…In articles focusing on the ODS of high sulfur content fractions (> 0.5 wt.%S), heterogeneous catalysts are mainly composed of one active phase (often based on transition metals) dispersed on a support with large specific area. Among transition metals, the use of molybdenum [67][68][69][70][71], vanadium [72,73], and tungsten [74][75][76] as active phases has been reported. Comparative studies of the various active phases have been conducted [50,51] and various supports have been considered, including alumina [39,45,50,51,77], silica [38,78], and zeolites [79,80].…”

Section: Heterogeneous Catalystsmentioning

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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Section: Heterogeneous Catalystsmentioning

confidence: 99%

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

et al. 2018

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“…in conducted to reduce the sulphur content Removal of sulphur-rich fuels such as benzothiophene and dibenzothiophene is crucial in the Oxidative desulphurisation (ODS) operates in mild conditions overcomes 2 refinement of fossil fuels. the shortcoming of conventional hydrodesulfurisation (HDS) process which required high temperature 3 and cost. Moreover, HDS is ineffective to remove aromatic sulphur compounds due to steric hindrance.…”

Section: Introductionmentioning

confidence: 99%

Starch functionalization of trimetallic W-Mg-Al oxide for oxidative desulphurisation of dibenzothiophene

Kimi¹,

Ngaini²,

Hamdan³

2020

10.5267/j.ccl

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A novel trimetallic W-Mg-Al oxide composites immobilised onto starch were synthesized via sol-gel method. W-Mg-Al oxide composites were synthesized by first preparing WO3 using incipient wetness method, followed by immobilising onto MgO-Al2O3 support using starch as binder. The effects of starch addition on the crystal properties and morphology were investigated by X-ray diffraction (XRD), Fourier Transform Infrared (FT-IR) spectroscopy and Scanning Electron Microscopy (SEM). In the presence of hydrogen peroxide and acetic acid as oxidant system, W-Mg-Al oxide starch composites exhibited higher catalytic performances for oxidative desulphurisation (ODS) of dibenzothiophene (DBT) at 95% compared to W-Mg-Al oxide composites. The catalytic activity observed could be correlated to the distribution of active phases on starch as well as the higher crystallinity of the metal oxide composites.

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“…Among these techniques, adsorptive desulfurization stands out due to its simplicity, efficiency and low-cost according to the solid chosen as the adsorbent. Activated carbon [1], MOFs [9], , , and MCM-41 [7,11] are currently being investigated for sulfur adsorption from liquid fuels, among other materials.These molecular sieves, especially MCM-41, are extensively applied as supports for adsorbents and heterogeneous catalysts due to their high surface area, ordered structure, and uniform pore size [12]. In general, heterogeneous micrometric size catalysts present low catalytic activity due to slow diffusion of reagents [13].…”

mentioning

confidence: 99%

“…The use of molecular sieve supports is fundamental to prevent the undesirable aggregation and loss of nanocatalysts [17,18].Moreover, MCM-41 has gained attention for its flexibility regarding the silica feedstock for synthesis. Recently, it has been produced from greener sources of silica such as coal fly ash (CFA) [12], rice husk ash [19], iron ore residues [20], wheat stem ash (WSA) [21], and MPI silica from beach sand [22,23], used in this study. This material has been functionalized by adding active sites to its surface for promoting new chemical interactions in the support-site-adsorbate system and improving the adsorptive treatment [24].…”

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confidence: 99%

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Assessment of Ag Nanoparticles Interaction over Low-Cost Mesoporous Silica in Deep Desulfurization of Diesel

et al. 2019

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Chemical interactions between metal particles (Ag or Ni) dispersed in a low-cost MCM-41 M produced from beach sand amorphous silica and sulfur compounds were evaluated in the deep adsorptive desulfurization process of real diesel fuel. N 2 adsorption-desorption isotherms, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), high-resolution transmission electron microscopy (HRTEM) and scanning transmission electron microscopy coupled to energy-dispersive X-ray spectroscopy (STEM-EDX) were used for characterizing the adsorbents. HRTEM and XPS confirmed the high dispersion of Ag nanoparticles on the MCM-41 surface, and its chemical interaction with support and sulfur compounds by diverse mechanisms such as π-complexation and oxidation. Thermodynamic tests indicated that the adsorption of sulfur compounds over Ag(I)/MCM-41 M is an endothermic process under the studied conditions. The magnitude of ∆H • (42.1 kJ/mol) indicates that chemisorptive mechanisms govern the sulfur removal. The best fit of kinetic and equilibrium data to pseudo-second order (R 2 > 0.99) and Langmuir models (R 2 > 0.98), respectively, along with the results for intraparticle diffusion and Boyd's film-diffusion kinetic models, suggest that the chemisorptive interaction between organosulfur compounds and Ag nanosites controls sulfur adsorption, as seen in the XPS results. Its adsorption capacity (q m = 31.25 mgS/g) was 10 times higher than that obtained for pure MCM-41 M and double the q m for the Ag(I)/MCM-41 C adsorbent from commercial silica. Saturated adsorbents presented a satisfactory regeneration rate after a total of five sulfur adsorption cycles. catalysts. However, some recalcitrant organosulfur such as thiophene derivatives are not removed by this method [4].Methods based on membrane separation [5], catalytic oxidation [3], biological desulfurization [6], and adsorption [1,[7][8][9][10][11] have been developed for desulfurizing fuels. Among these techniques, adsorptive desulfurization stands out due to its simplicity, efficiency and low-cost according to the solid chosen as the adsorbent. Activated carbon [1], MOFs [9], , , and MCM-41 [7,11] are currently being investigated for sulfur adsorption from liquid fuels, among other materials.These molecular sieves, especially MCM-41, are extensively applied as supports for adsorbents and heterogeneous catalysts due to their high surface area, ordered structure, and uniform pore size [12]. In general, heterogeneous micrometric size catalysts present low catalytic activity due to slow diffusion of reagents [13]. Therefore, active metal nanoparticles (NPs), which have high catalytic activity due to their high surface-volume ratio and chemical reactivity, have been incorporated into solid supports for increasing their efficiency, recyclability and stability, thus providing more sustainable processes [14][15][16]. When unsupported, the high surface energy of nanocatalysts increases system instability and leads to aggregation, thus resulting in the loss of its catalytic properties. The...

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Catalytic oxidative desulfurization of DBT using green catalyst (Mo/MCM-41) derived from coal fly ash

Cited by 119 publications

References 44 publications

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

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

Starch functionalization of trimetallic W-Mg-Al oxide for oxidative desulphurisation of dibenzothiophene

Assessment of Ag Nanoparticles Interaction over Low-Cost Mesoporous Silica in Deep Desulfurization of Diesel

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