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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Journal of Nanoanalysis
- نوع مقاله: Journal Article
- کلمات کلیدی: XRD,Thermal decomposition,TEM,Ni/NiO nanocomposites
- چکیده:
- چکیده انگلیسی: In this study, Ni/NiO nanocomposites were prepared using simple, environment-friendly and low-cost solid-state thermal decomposition method from nickel (II) Schiff base complex at 400 and 500°C for 3 hours. The Ni/NiO nanocomposites were characterized with Fourier transformed infra-red spectroscopy (FT-IR), X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and X-Ray fluorescence (XRF). Results of XRD and XRF confirmed that the nanocomposite products contain a mixture of nickel and nickel oxide. The Ni or NiO content varied with the temperature used for the synthesis. Upon increasing the temperature from 400 to 500°C, the amount of NiO was found to be increased due to a complete oxidation of Ni to NiO. The TEM images demonstrated that the composites were spherical with a distribution size of about 10-30 nm. In addition, the products displayed reasonable electrochemical performance.
- انتشار مقاله: 03-03-1397
- نویسندگان: Aliakbar Dehno Khalaji,Gholamhossein Grivani,Shaghayegh Izadi,Mehdi Ebadi
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Chemistry and Chemical Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Immobilization,Epoxidation,carbon nano tube,Mo,alkene
- چکیده:
- چکیده انگلیسی: The acidic group (-CO2H) of MultiWall Carbon Nanotube (MWCNT) converted to acyl chloride group (-COCl) producing of MVCNT@COCl. Then the reaction of MVCNT@COCl and MoO2(acac)2 resulted in direct immobilization of the MoO2(acac)2 and the formation of MVCNT@CO(acac)MoO2(acac) catalyst. In addition, the MVCNT@COCl was esterified by NaOC2H5 and formed the esteric MVCNT@COC2H5 reagent. In a subsequent reaction of MVCNT@COC2H5 by ethylene diamine, the MVCNT@CONHCH2CH2NH2 was produced. It was reacted with MoO2(acac)2 and immobilized the MoO2(acac)2 via imine bond formation and produced the MVCNT@CONHCH2CH2N(acac)MoO2(acac) catalyst. The functionalized MVCNT reagents
were characterized by FT-IR spectra and elemental analysis. The molybdenum loading on MVCNT was determined by ICP analysis. The catalytic activity of the two molybdenum immobilized catalysts (MVCNT@COMoO2(acac)2 and MVCNT@CONHCH2CH2N(acac)MoO2(acac)) was investigated in the epoxidation of cyclooctene and different reaction parameters such as solvent, oxidant, amount of catalyst and oxidant were optimized and the epoxidation of different alkenes was investigated in these optimized conditions. The obtained results showed that the supported catalysts of MVCNT@CO(acac)MoO2(acac)2 and MVCNT@CONHCH2CH2N(acac)MoO2(acac) were highly active and selective in the epoxidation of a wide range of alkenes. The reusability of the supported catalysts was also studied. The results showed that they had good reusability in the epoxidation of alkenes.- انتشار مقاله: 23-09-1395
- نویسندگان: Mahdieh Nafar,Gholamhossein Grivani
- مشاهده