Oxidative desulfurization of dibenzothiophene catalyzed by α-MnO<sub>2</sub> nanosheets on palygorskite using hydrogen peroxide as oxidant

Yu, Xingming; Han, Ping; Li, Ya

doi:10.1039/c8ra02396d

Cited by 21 publications

(11 citation statements)

References 39 publications

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“… 9 In an ODS reaction, when sulfur-containing compounds are oxidized, the sulfur removal efficiency of the catalysts is enhanced. 10 , 11 ODS converts sulfur compounds into high-polarity sulfoxides and sulfones that can be extracted by a polar solvent afterward. ODS reactions can be operated under mild operating conditions in the liquid phase.…”

Section: Introductionmentioning

confidence: 99%

Process Optimization for Catalytic Oxidation of Dibenzothiophene over UiO-66-NH₂ by Using a Response Surface Methodology

et al. 2022

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This research investigates the catalytic performance of a metal–organic framework (MOF) with a functionalized ligand—UiO-66-NH 2 —in the oxidative desulfurization of dibenzothiophene (DBT) in n -dodecane as a model fuel mixture (MFM). The solvothermally prepared catalyst was characterized by XRD, FTIR, 1 H NMR, SEM, TGA, and MP-AES analyses. A response surface methodology was employed for the experiment design and variable optimization using central composite design (CCD). The effects of reaction conditions on DBT removal efficiency, including temperature ( X 1 ), oxidant agent over sulfur (O/S) mass ratio ( X 2 ), and catalyst over sulfur (C/S) mass ratio ( X 3 ), were assessed. Optimal process conditions for sulfur removal were obtained when the temperature, O/S mass ratio, and C/S mass ratio were 72.6 °C, 1.62 mg/mg, and 12.1 mg/mg, respectively. Under these conditions, 89.7% of DBT was removed from the reaction mixture with a composite desirability score of 0.938. From the results, the temperature has the most significant effect on the oxidative desulfurization reaction. The model F values gave evidence that the quadratic model was well-fitted. The reusability of the MOF catalyst in the ODS reaction was tested and demonstrated a gradual loss of activity over four runs.

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Section: Introductionmentioning

confidence: 99%

Process Optimization for Catalytic Oxidation of Dibenzothiophene over UiO-66-NH₂ by Using a Response Surface Methodology

et al. 2022

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“…71 Furthermore, the latter changes in the removal rate could be attributed to the low thermal stability of H 2 O 2 and its possible thermal decomposition to H 2 O and O 2 . 73 3.3. Comparative Studies.…”

Section: Resultsmentioning

confidence: 99%

“…At lower temperature levels (298 K), highly polar DBTO 2 could be easily adsorbed on the active sites of Cu/Zn/g photocatalyst, preventing further DBT oxidation and leading to decreased sulfur removal rates (53.0%) . Furthermore, the latter changes in the removal rate could be attributed to the low thermal stability of H 2 O 2 and its possible thermal decomposition to H 2 O and O 2 …”

Section: Resultsmentioning

confidence: 99%

Dual Z-Scheme CuO-ZnO@Graphitic Carbon Nitride Ternary Nanocomposite with Improved Visible Light-Induced Catalytic Activity for Ultrasound-Assisted Photocatalytic Desulfurization

et al. 2020

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A CuO-ZnO@graphitic carbon nitride (Cu/Zn/g) triplex heterojunction nanocomposite was prepared through a multistep ultrasound-assisted hydrothermal procedure. XRD, SEM, EIS, EDX, BET, FT-IR, EDS, UV−Vis, TEM, PL, and transient photocurrent techniques were employed for catalyst characterization. The XRD profiles demonstrated the formation of the ZnO wurtzite phase and CuO monoclinic phase in the samples. It was revealed by the SEM and TEM images that the Cu/Zn/g catalyst is composed of g-C 3 N 4 nanosheets decorated with ZnO nanorods and CuO nanospheres. According to the results obtained from the ultrasound-assisted desulfurization experiments, almost complete sulfur removal was achieved using Cu/Zn/g at a photocatalyst dose of 0.2 g/L, initial dibenzothiophene (DBT) concentration of 250 ppm, and H 2 O 2 loading of 250 ppm at 298 K within 60 min of treatment in the presence of ultrasonic waves (80 W/m 2 ) and light irradiation (150 W). Upon g-C 3 N 4 incorporation, considerable enhancement in desulfurization efficiency was achieved due to the significantly higher surface area and lower recombination rate of electron−hole pairs. At optimal experimental conditions, a 99.1% desulfurization rate was achieved using Cu/Zn/g with a g-C 3 N 4 concentration of 10 wt %, compared to the pristine CuO-ZnO catalyst (76.2%). Moreover, the as-synthesized photocatalyst showed excellent stability after five cycles. Kinetic studies also confirmed that the desulfurization procedure could be fitted to a pseudo-firstorder kinetic model. Finally, the product of DBT oxidation was identified by the gas chromatography−mass spectrometry analysis. It was revealed on the basis of the photoelectrochemical and trapping experiments that the photoinduced holes and •OH radicals are responsible for desulfurization and the charge carrier migration pattern is dictated by the dual Z-scheme approach, resulting in the enhanced redox potential of the as-synthesized catalyst and therefore outstanding photocatalytic performance. ■ HIGHLIGHTS• Cu/Zn/g ternary composite was prepared and used for sono-photocatalytic desulfurization. • Complete desulfurization was achieved using a combined approach of the dual Z-scheme Cu/Zn/g photocatalyst, US, and visible light irradiation within 60 min. • The fabricated catalyst showed excellent catalytic performance and stability after five cycles. • Photogenerated charge carriers and •OH radicals are responsible for the oxidative treatment.

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“…Two-dimensional nanostructures such as nanosheets find many applications in various fields due to their unique physical, chemical, optical, and electrical properties associated with the nanoscale dimensions in its diameter and thickness compared to zero and one-dimensional nanostructures like spherical nanoparticles, nanorods, and nanowires. These applications include fabrication of nanodevices 1,2 , formation of transparent conducting electrodes 3,4 , lithium ion batteries 5,6 , energy storage devices 7,8 , desulphurization of fuel 9 etc. In the past few decades, extensive work has been conducted using prominent two-dimensional nanostructures such as graphene/graphene oxide for various applications 10 .…”

Section: Introductionmentioning

confidence: 99%

Two-dimensional Cu nanostructures for efficient photo-catalytic degradation of methylene blue

Chandan

Kumar

Shaik

2022

Environ. Sci.: Adv.

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Oxidative desulfurization of dibenzothiophene catalyzed by α-MnO₂ nanosheets on palygorskite using hydrogen peroxide as oxidant

Abstract: Palygorskite (Pal)-supported α-MnO2 nanosheets (Ns-MnPal) combine the adsorption features of Pal with the catalytic properties of α-MnO2 nanosheets.

Cited by 21 publications

References 39 publications

Process Optimization for Catalytic Oxidation of Dibenzothiophene over UiO-66-NH₂ by Using a Response Surface Methodology

Process Optimization for Catalytic Oxidation of Dibenzothiophene over UiO-66-NH₂ by Using a Response Surface Methodology

Dual Z-Scheme CuO-ZnO@Graphitic Carbon Nitride Ternary Nanocomposite with Improved Visible Light-Induced Catalytic Activity for Ultrasound-Assisted Photocatalytic Desulfurization

Two-dimensional Cu nanostructures for efficient photo-catalytic degradation of methylene blue

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Oxidative desulfurization of dibenzothiophene catalyzed by α-MnO2 nanosheets on palygorskite using hydrogen peroxide as oxidant

Abstract: Palygorskite (Pal)-supported α-MnO2 nanosheets (Ns-MnPal) combine the adsorption features of Pal with the catalytic properties of α-MnO2 nanosheets.

Cited by 21 publications

References 39 publications

Process Optimization for Catalytic Oxidation of Dibenzothiophene over UiO-66-NH2 by Using a Response Surface Methodology

Process Optimization for Catalytic Oxidation of Dibenzothiophene over UiO-66-NH2 by Using a Response Surface Methodology

Dual Z-Scheme CuO-ZnO@Graphitic Carbon Nitride Ternary Nanocomposite with Improved Visible Light-Induced Catalytic Activity for Ultrasound-Assisted Photocatalytic Desulfurization

Two-dimensional Cu nanostructures for efficient photo-catalytic degradation of methylene blue

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Oxidative desulfurization of dibenzothiophene catalyzed by α-MnO₂ nanosheets on palygorskite using hydrogen peroxide as oxidant

Process Optimization for Catalytic Oxidation of Dibenzothiophene over UiO-66-NH₂ by Using a Response Surface Methodology

Process Optimization for Catalytic Oxidation of Dibenzothiophene over UiO-66-NH₂ by Using a Response Surface Methodology