Synthesis and characterization of new nanocomposite CTAB-PTA@CS as an efficient heterogeneous catalyst for oxidative desulphurization of gasoline

Maleki

2019

Applied Organom Chemis

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In this work, a new nanocatalyst, Fe2W18Fe4@NiO@CTS, was synthesized by the reaction of sandwich‐type polyoxometalate (Fe2W18Fe4), nickel oxide (NiO), and chitosan (CTS) via sol–gel method. The assembled nanocatalyst was systematically characterized by FT‐IR, UV–vis, XRD, SEM, and EDX analysis. The catalytic activity of Fe2W18Fe4@NiO@CTS was tested on oxidative desulfurization (ODS) of real gasoline and model fuels. The experimental results revealed that the levels of sulfur content and mercaptan compounds of gasoline were lowered with 97% efficiency. Also, the Fe2W18Fe4@NiO@CTS nanocatalyst demonstrated an outstanding catalytic performance for the oxidation of dibenzothiophene (DBT) in the model fuel. The major factors that influence the desulfurization efficiency and the kinetic study of the ODS reactions were fully detailed and discussed. The probable ODS pathway was proposed via the electrophilic mechanism on the basis of the electrophilic characteristic of the metal‐oxo‐peroxo intermediates. The prepared nanocatalyst could be reused for 5 successive runs without any appreciable loss in its catalytic activity. As a result, the current study suggested the potential application of the Fe2W18Fe4@NiO@CTS hybrid nanocatalyst as an ideal candidate for removal of sulfur compounds from fuel.

Section: Resultsmentioning

confidence: 94%

“…The removal efficiencies of MTCs from the model fuels at 35 °C rapidly were increased from 35% in the 10 min of reaction up to 95% as the stirring time increased to 60 min. Thus, reaction temperature and time were set to 30 °C and 60 min, respectively, as optimum conditions of ODS systems …”

Section: Resultsmentioning

confidence: 99%

Facile synthesis of inorganic–organic Fe₂W₁₈Fe₄@NiO@CTS hybrid nanocatalyst induced efficient performance in oxidative desulfurization of real fuel

Maleki

2019

Applied Organom Chemis

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“…In Table , the Arrhenius plots and the calculated E a values for the oxidation of DBT, BT, and Th were 44.364, 45.419, and 51.560 kJ mol −1 , respectively (Figure ) that the values were compared with that of other ODS system reported in the previous literature .…”

Section: Resultsmentioning

confidence: 87%

“…As shown in Figure 3, the Bragg peaks of PMA within 10-508 corresponding to the characteristic diffraction peaks of Keggin-type structures, attributed to (001), (110), (140), and (014) planes [24]. The CS with semicrystalline nature exhibited refraction at 19.98 ( Figure 3c) [22]. From the spectra of IMID-PMA@CS, the appeared broad amorphous peaks in nanocomposite pattern suggested the fine dispersion of IMID@PMA units on the CS surface (Figure 3d).…”

Section: X-ray Diffraction (Xrd) Analysismentioning

confidence: 95%

“…Recently, the surface modification of POM supported catalysts with hydrophilic and hydrophobic functional groups has proved to be an effective solution to form amphiphilic solid POM catalysts, which can be utilized in heterogeneous catalysis, allowing facile separation and recycling after operation [14,15]. In continuation of our group researches on the synthesis and application of POM in organic reaction, we report the applicability of IMID@PMA@CS for efficient desulfurization of gasoline to preparation of clean fuels [15][16][17][18][19][20][21][22][23][24][25][26]. In this study, the new class of phase transfer-type nanocatalyst (IMID@PMA@CS) was synthesized and its catalytic activity in sulfur oxidation treatments evaluated.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Oxidative desulfurization of gasoline catalyzed by IMID@PMA@CS nanocomposite as a high‐performance amphiphilic nanocatalyst

Env Prog and Sustain Energy

Shaterian

Aghbolagh

et al. 2018

A new organic–inorganic hybrid phase transfer‐type nanocatalyst (IMID@PMA@CS) was successfully prepared by modification of H3PMo12O40 (PMA) with imidazolium bromide C3N2H5Br (IMIDBr) and immobilized on chitosan polymer via sol–gel method under oil‐bath condition at room temperature. The incorporation of the materials was confirmed by Fourier transform infrared spectroscopy (FTIR), ultraviolet–visible (UV–vis), X‐ray diffraction (XRD), and scanning electron microscopy (SEM) characterization methods. Catalytic activity of synthesized nanocomposite was tested on the oxidative desulfurization (ODS) of model sulfur compounds and real gasoline in the presence of H2O2/CH3COOH as an oxidant and acetonitrile as an extraction solvent in different conditions. Additionally, kinetic studies were carried out and activation energy for oxidation of sulfur compounds was determined. The excellent reusability of the heterogeneous IMID@PMA@CS composite was achieved in five cycles. It is believed that the present IMID@PMA@CS/CH3COOH/H2O2 system can be a convenient strategy for lowering the sulfur content of gasoline fuel under moderate reaction conditions. © 2018 American Institute of Chemical Engineers Environ Prog, 37: 1901–1907, 2018

Synthesis and characterization of a new nanocomposite (FeW₁₁V@CTAB‐MMT) as an efficient heterogeneous catalyst for oxidative desulfurization of gasoline

Khandan

2018

Applied Organom Chemis

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A new nanocomposite (FeW 11 V@CTAB-MMT) was designed on the basis of vanadium-substituted tungstoferrate (FeW 11 V) and cetyltrimethylammonium bromide-modified montmorillonite (CTAB-MMT) as an efficient nanocatalyst for oxidative desulfurization (ODS) of gasoline. The synthesized catalyst was characterized using various techniques. To evaluate the catalytic activity of FeW 11 V@CTAB-MMT, ODS was carried out using a mixture of aqueous acetic acid and hydrogen peroxide solution as an oxidant and acetonitrile solvent as an extractant. The ODS results revealed that the removal efficiencies of thiophene, benzothiophene and dibenzothiophene were more than 97% in the presence of the FeW 11 V@CTAB-MMT catalyst at 35°C after 1 h. Kinetics of the catalytic ODS reactions was found to be pseudo-first-order. The prepared heterogeneous catalyst was found to be reusable for five runs without a discernible decrease in its activity. The current research provides insight into a new catalytic system for the ODS process for the deep removal of hazardous sulfur molecules from gasoline.