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Partial oxidation of methane over SiO2 supported Ni and NiCe catalysts

Journal of Energy Chemistry 2020年第8期29卷 1-9,I0001页

作者： A.Emamdoust v.la parola G.Pantaleo M.L.Testa S.Farjami Shayesteh A.M.venezia Nanostructure lab Department of PhysicsUniversity of GuilanRashtIran Istituto per lo Studio dei Materiali Nanostrutturati(ISMN-CNR) Via Ugo La Malfa 153PalermoItaly

Nickel and nickel-ceria catalysts supported on high surface area silica, with 6 wt% Ni and 20 wt% CeO2 were prepared by microwave assisted(co) precipitation method. The catalysts were investigated by XRD,TPR and XPS analyses and they were tested in partial oxidation of methane(CPO). The catalytic reaction was carried out at atmospheric pressure in a temperature range of 400–800℃ with a feed gas mixture containing methane and oxygen in a molecular ratio CH4/O2=2. The Ni catalyst exhibited 60% methane conversion with 60% selectivity to CO already at 500℃. On the contrary, the Ni–Ce catalyst was inert to CPO up to 700℃. Moreover, the former catalyst reproduced its activity at the descending temperatures maintaining a good stability at 600℃, over a reaction time of 80 h, whereas the latter one completely deactivated. Test of CH4 temperature programmed surface reaction(CH4-TPSR) revealed a higher methane activation temperature(> 100℃) for the Ni–Ce catalyst as compared to the Ni one. Noticeable improvement of the ceria containing catalyst occurred when the reaction test started at a temperature higher than the methane decomposition temperature. In this case, the sample achieved the same catalytic behavior of the Ni catalyst. As confirmed by XPS analyses, the distinct electronic state of the supported nickel was responsible for the differences in catalytic behavior.

关键词： Methane catalytic partial oxidation(CPO) Ni catalyst NiCe SiO2 supported catalysts

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Synthesis of Cu Doped ZnO Nanoparticles: Crystallographic, Optical, FTIR, Morphological and Photocatalytic Study

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Journal of Materials Science and Chemical Engineering 2015年第7期3卷 39-51页

作者： P. K. labhane v. R. Huse L. B. Patle A. L. Chaudhari G. H. Sonawane MGSM’s Arts Science and Commerce College Chopda India Kisan Arts Commerce and Science College Parola India

Nanoparticles of Zn1-xCuxO system with nominal compositions x = 0.0, 0.01, 0.02 and 0.03 were prepared by co-precipitation method at room temperature. Structural, morphological, optical and chemical species of grown crystals were investigated by X-ray diffraction (XRD) technique, Scanning Electron Microscopy (SEM), Uv-visible and FTIR spectroscopy, respectively. XRD analysis confirms that all samples have hexagonal structure with no impurity phases which suggest that Cu ion successfully incorporated into the regular ZnO crystal structure. The lattice parameters, volume of unit cell, X-ray density, atomic packing fraction, c/a ratio, and grain size were calculated from XRD pattern of pure and Cu doped ZnO samples and it was found that the grain size was in the range of 23 nm to 29 nm. The strain in pure and Cu doped ZnO samples was calculated by W-H analysis. Optical properties of Zn1-xCuxO samples were studied by using Uv-vis spectrophotometer. Optical absorption spectra show that the band gap decreases with increasing Cu contents. The functional group and chemical interactions of Zn1-xCuxO samples were also determined at various peaks using FTIR data and observed that the functional groups corresponding to the Zn-O bands in the samples. The photocatalytic activities of the samples were investigated by oxidation of methylene blue under Uv light illumination in batch reactor. The scavenger study was carried out to find out main reactive species responsible for the degradation of dyes.

关键词： ZnO Nanostructure Bandgap Photocatalytic Activity Scavenger Study

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