Developments of modified magnetic nanoparticle -supported heteropolyacid catalytic performances in dibenzothiophene desulfurization

Iranian Journal of Catalysis

مقاله 7، دوره 7، شماره 4، اسفند 2017، صفحه 303-315   

نوع مقاله: Articles

نویسندگان

Hossein Salavati^{* 1}؛ Abbas Teimouri¹؛ Shahnaz Kazemi²

¹Department of Chemistry, Payame Noor University, 19395-3697, Tehran, Iran.

²Department of Chemistry, Birjand University, 97179-414, Birjand, Iran.

چکیده

In this research, Keggin-type polyoxometalate, H₅PMoV₂O₄₀ (denoted as PMoV) was immobilized on modified NiFe₂O₄ nanoparticles to produce a magnetically separable catalyst. This catalyst was characterized using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FESEM), cyclic voltummetry (CV), energy dispersive X-ray (EDX) and UV-vis diffuse reflectance spectroscopy (UV-DRS). The catalytic activity of synthesized catalyst in oxidation of dibenzothiophene (DBT) to dibenzothiophene sulfone (DBTO₂) was investigated using H₂O₂ as an oxidant and acetonitrile as an extractant. The catalyst could be readily separated from the catalytic system using the magnetic field; and loss of activity was negligible when the catalyst was recovered in five consecutive runs. The effects of main process variables including H₂O₂ amount (mmol), reaction temperature (°C) and reaction time (min) were analyzed by response surface methodology (RSM) based on the central composite design (CCD). The optimal condition for conversion of DBT was found to be H₂O₂ 2.8 mmol, reaction temperature 42^°C and reaction time 57 min for 0.1 g of catalyst dosage. The conversion of DBT to DBTO₂ under optimized conditions was 85.9 %. Moreover, the dibenzothiophene sulfone product was characterized by NMR, FT-IR, Mass and GC analysis.

کلیدواژه‌ها

Heteropolyacid؛ Magnetic nanoparticles؛ oxidation؛ Supported catalyst

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