VOHPO4.5H2O/KIT-6 composites: Preparation and their application in extractive and catalytic oxidation desulfurization of benzothiophene and dibenzothiphene

Moslemi, Ali; Chermahini, Alireza Najafi; Sarpiri, Jaleh Najafi; Rezaei, Sabereh; Barati, Mansoor

doi:10.1016/j.jtice.2019.01.030

Cited by 31 publications

(3 citation statements)

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“…However, the combustion of sulfur compounds in liquid fuels may result in the emission of sulfur oxides (SO X ) into the atmosphere, causing acid rain and photochemical smog. SO X can also affect the exhaust gas converter of the automobile, potentially resulting in an increase in the discharge of other pollutants. − Thus, there is a need for deep desulfurization of liquid fuels. The widely used hydrodesulfurization method has some drawbacks that can limit its application such as harsh operating conditions, the requirement of high temperature and pressure, consumption of a large quantity of high purity hydrogen and highly active catalyst, and long reaction time. − Thus, it is practically important to develop non-hydrodesulfurization methods such as oxidative desulfurization (ODS), − extraction desulfurization, , adsorption desulfurization, , biological desulfurization, and photocatalytic desulfurization. , Of these methods, ODS has emerged as a promising method for deep desulfurization of liquid fuels due to mild operating conditions and simple procedures.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Graphene Oxide Covalently Functionalized with Dawson-Type Polyoxotungstates for Oxidative Desulfurization of Model Fuels

Liu

Wang

et al. 2020

Ind. Eng. Chem. Res.

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Graphene oxide (GO) with three-dimensional network structure (3D GO) was used as a support, and the monovacant Dawson polyoxotungstate K10[α-P2W17O61]·20H2O (P2W17) modified with silane coupling agent was covalently immobilized on 3D GO to prepare a novel heterogeneous catalyst P2W17/3D GO. Characterizations of the supported catalyst by FT-IR, UV–vis, XPS, SEM, and TEM confirmed that P2W17 was immobilized on 3D GO successfully and well dispersed. The as-prepared catalyst P2W17/3D GO exhibited high catalytic performance in the oxidative desulfurization (ODS) system of model fuels containing dibenzothiophene (DBT) or tetrahydrothiophene (THT) using H2O2 as the oxidant. 3D GO exhibits a certain carrier effect due to its three-dimensional network structure, the strong adsorption of thiophene compounds through π–π and S−π interactions, and the acid–base interactions with 3D GO, which make the ODS performance of P2W17/3D GO much higher than that of P2W17/2D GO as well as the homogeneous catalyst EPO-P2W17. Various reaction conditions were investigated, and complete oxidative removal of DBT (500 ppm) and THT (5000 ppm) was achieved at 120 and 30 min under the optimum conditions, respectively. Kinetics studies were conducted to better understand the oxidation reactions, and the catalytic oxidation of DBT and THT can both be well described by the pseudo-first-order model. Moreover, the supported catalyst P2W17/3D GO showed excellent durability even after 5 times recycling due to covalent immobilization, which makes it a promising prospect for industrial application.

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Section: Introductionmentioning

confidence: 99%

Three-Dimensional Graphene Oxide Covalently Functionalized with Dawson-Type Polyoxotungstates for Oxidative Desulfurization of Model Fuels

Liu

Wang

et al. 2020

Ind. Eng. Chem. Res.

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“…A combustão de compostos organossulfurados promove a liberação de SOx na atmosfera, favorecendo a ocorrência de chuvas ácidas. Além do ponto de vista ambiental, o processamento de combustíveis com alto teor de enxofre leva ao envenenamento dos catalisadores veiculares e provoca corrosão em sistemas onde o contaminante está presente (HAO et al, 2019;MOSLEMI et al, 2019).…”

Section: Introductionunclassified

A química além da teoria

Missau¹,

Fernandes²,

Machado³

et al. 2021

Processos Químicos E Biotecnológicos – Volume 7

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“…Heretofore, oxidative desulfurization (ODS) has gained considerable attention as a genuinely effective method compared to other desulfurization procedures. It needs to be considered that the thiophenic compounds could be easily separated by either extraction or adsorption if converted into their highly polar oxidized derivatives (sulfoxides or sulfones), which could be successfully achieved by utilizing the ODS process. − …”

Section: Introductionmentioning

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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VOHPO4.5H2O/KIT-6 composites: Preparation and their application in extractive and catalytic oxidation desulfurization of benzothiophene and dibenzothiphene

Cited by 31 publications

References 53 publications

Three-Dimensional Graphene Oxide Covalently Functionalized with Dawson-Type Polyoxotungstates for Oxidative Desulfurization of Model Fuels

Three-Dimensional Graphene Oxide Covalently Functionalized with Dawson-Type Polyoxotungstates for Oxidative Desulfurization of Model Fuels

A química além da teoria

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

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