A Study on the Effect of Calcination Temperature on the Graphitization of Carbon Nanotubes Synthesized by the Decomposition of Methane

Liu, Wei Wen; Adam, Tijjani; Aziz, Azizan; Chai, Siang Piao; Mohamed, Abdul Rahman; Hashim, U.

doi:10.4028/www.scientific.net/AMR.832.56

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HomeAdvanced Materials ResearchNanoscience, Nanotechnology and NanoengineeringA Study on the Effect of Calcination Temperature...

A Study on the Effect of Calcination Temperature on the Graphitization of Carbon Nanotubes Synthesized by the Decomposition of Methane

Abstract:

The effect of calcination temperature for Fe₂O₃/MgO catalysts on the formation of carbon nanotubes (CNTs) was examined. CNTs were synthesized over Fe₂O₃/MgO catalysts calcined at different temperatures by catalytic decomposition of methane at 1000°C. The synthesized CNTs were investigated by a combination of scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and Raman spectroscopy. The results show that the effect of calcination temperatures greatly governed the diameter and the quality of the SWCNTs formed. The catalysts calcined at 500, 600 and 700°C produced CNTswith the diameters of 1.53, 1.95 and 2.97nm, respectively. Generally, an increase in the calcination temperature increases the average diameter and decreases the quality of the CNTs produced.

Info:

Periodical:

Advanced Materials Research (Volume 832)

Main Theme:

Nanoscience, Nanotechnology and Nanoengineering

Edited by:

Mohamad Hafiz Mamat, Zuraida Khusaimi, Suriani Abu Bakar, Asiah Mohd Nor, Tetsuo Soga and Mohamad Rusop Mahmood

Pages:

56-61

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.832.56

Citation:

W. W. Liu et al., "A Study on the Effect of Calcination Temperature on the Graphitization of Carbon Nanotubes Synthesized by the Decomposition of Methane", Advanced Materials Research, Vol. 832, pp. 56-61, 2014

Online since:

November 2013

Authors:

Wei Wen Liu, Tijjani Adam, Azizan Aziz, Siang Piao Chai, Abdul Rahman Mohamed, U. Hashim

Keywords:

Chemical Vapor Deposition (CVD), Electron Microscopy, Nanostructure, Raman Scattering, Raman Spectroscopy

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Paper TitlePages

Hydrothermal Synthesis of Luminescent Wollastonite-CePO₄ Nanocomposites

Authors: Ming Guo Ma, Jie Fang Zhu, Run Cang Sun

Abstract: Luminescent wollastonite-CePO4 nanocomposites have been successfully synthesized using Ca(NO3)2•4H2O, Na2SiO3•9H2O, and CePO4 by hydrothermal method at 200 oC for 24 h. The precursor nanorods with diameters about 20 nm and lengths several micrometers were obtained by hydrothermal treatment, and after calcination at 600 oC for 3h, the precursor nanorods transformed to wollastonite-CePO4 nanocomposites. Considering the experiment result, a possible growth of the precursor nanorods via the rolling mechanism was also proposed. This is the first report about the synthesis of luminescent wollastonite-CePO4 nanocomposites. The products were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), selected area electron diffraction (SAED), energy-dispersive X-ray spectroscopy (EDS), and photoluminescence (PL).

125

Catalytic Oxidation of Toluene over Fe₂O₃/Al₂O₃ Catalyst

Authors: Takeshi Miki, Yutaka Tai

Abstract: Fe₂O₃/Al₂O₃ catalyst was prepared and the catalytic oxidation of toluene over the catalyst was investigated. The catalyst was prepared by wet impregnation of commercial alumina support. The support was impregnated with an aqueous solution of iron nitrate. The wet support was dried and calcined at 600-800 °C. The catalytic property of the catalyst was measured by the light-off curve of CO₂ yield. All these catalysts were active for total oxidation of toluene above 250 °C. The catalytic activity of catalyst calcined at 600 °C was better than those of catalysts calcined at 700 and 800 °C.

101

Anatase TiO₂ Films via a Sol-Gel and Hydrothermal Crystallization for Enhanced Corrosion Resistance

Authors: Hong Yun, Chang Jian Lin, Qun Jie Xu

Abstract: Anatase of TiO₂films were supplied on the surface of 316L stainless steel by a sol–gel process followed by hydrothermal treatment in water. The as-prepared samples were characterized with filed emission scanning electron microscope (FESEM), transmission electron microscopy (TEM), atomic force microscopy (AFM) and Raman spectroscopy. The corrosion performances of the films in 3.5 wt% NaCl solution were evaluated by electrochemical impedance spectroscopy (EIS) and polarization measurements. The results revealed that the corrosion resistance of the TiO₂ films via the hydrothermal treatment at 170°C for 4h exceeded that of the counterparts treated by conventional calcination at 450°C. This could be attributed that the surface of such a sample was more compact and uniform, relatively well-crystallized, able to act as an optimal barrier layer to metallic substrates.

2707

XAS Study on Calcination Effect of Silica Supported Cobalt Catalysts for Fischer-Tropsch Synthesis

Authors: Siwaruk Chotiwan, Waritsara Bungmek, Sanya Prangsri-Aroon, Pinsuda Viravathana

Abstract: The precalcined and calcined silica supported cobalt catalysts at 15, 20, and 25%Co were investigated by X-ray Absorption Spectroscopy (XAS) including the X-ray absorption near edge structure (XANES) and the extended X-ray absorption fine structure (EXAFS). The results showed the phase of Co(NO₃)₂.6H₂O in all precalcined catalysts, which corresponded to the XRD measurement. When increasing the amount of cobalt in the precalcined catalysts, there was the presence of ordered Co(NO₃)₂.6H₂O phase. After calcination in Ar at 600°C for 6 h, the Co₃O₄ phase was presented in all calcined catalysts. For the catalytic performance testing, the selected 20%Co/Aerosil_wi_calcined catalyst was reduced at 450°C in H₂ and operated at 190°C with a total pressure of 10 bar and H₂/CO flow rate of 20:10 ml/min for Fischer-Tropsch synthesis. After reaction testing, the used 20%Co/Aerosil_wi catalyst showed the main phase of Co₃O₄. The result showed high methane selectivity at the beginning of reaction. By increasing of reaction time, the methane selectivity tended to decrease, whereas the C₂-C₄ and C₅₊ selectivity was increased.

1413

The Combustion Synthesis of Nanoscale Ceria-Doped Calcia Solid Solution

Authors: Jing Xu, Qing Hua Chen, Xin Ping Liu, Bao Quan Huang, Qing Rong Qian

Abstract: A nanoscale ceria-doped calcia solid solution has been synthesized by controled self-combustion method. The difference in crystal structure of samples prepared from different fuels were identified by XRD. The change of the crystal structure of the ceria-doped calcia sintering at different temperature was also investigated. SEM indicates that a nanoscale and uniform particle with diameter less than 100 nm was achieved by this method.

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