Surface area and thermal stability effect of the MgO supported catalysts for the synthesis of carbon nanotubes

2008 ◽  
Vol 18 (47) ◽  
pp. 5738 ◽  
Author(s):  
Yang Xu ◽  
Zhongrui Li ◽  
Enkeleda Dervishi ◽  
Viney Saini ◽  
Jingbiao Cui ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Thermal Stability ◽  
Surface Area ◽  
Supported Catalysts ◽  
Synthesis Of Carbon Nanotubes ◽  
Stability Effect

Synthesis of carbon nanotubes using supported catalysts modified by lanthanum species

Carbon ◽  
2002 ◽  
Vol 40 (13) ◽  
pp. 2497-2502 ◽  
Author(s):  
Cheng C Tang ◽  
Xiaoxia Ding ◽  
Zongwei Gan ◽  
Jianming Gao ◽  
Xintang Huang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Supported Catalysts ◽  
Synthesis Of Carbon Nanotubes

Synthesis of carbon nanotubes over gold nanoparticle supported catalysts

Carbon ◽  
2005 ◽  
Vol 43 (13) ◽  
pp. 2654-2663 ◽  
Author(s):  
Seung-Yup Lee ◽  
Mami Yamada ◽  
Mikio Miyake
Keyword(s):  
Carbon Nanotubes ◽  
Gold Nanoparticle ◽  
Supported Catalysts ◽  
Synthesis Of Carbon Nanotubes

Synthesis of Carbon Nanotubes, and the Effect on Thermal Stability in High-Impact Polystyrene

2008 ◽  
Vol 61 (1) ◽  
pp. 72 ◽  
Author(s):  
Qinghong Kong ◽  
Junhao Zhang
Keyword(s):  
Carbon Nanotubes ◽  
Thermal Stability ◽  
Degradation Mechanism ◽  
High Impact ◽  
Gas Chromatography Mass Spectrometry ◽  
Scanning Calorimetry ◽  
Pyrolysis Gas ◽  
High Impact Polystyrene ◽  
Synthesis Of Carbon Nanotubes ◽  
Better Than

Carbon nanotubes (CNTs) with diameters ranging from 40 to 100 nm have been synthesized by the solvothermal process using ethanol as a carbon source and LaNiO3 as catalyst. The synthesized CNTs can be used for filaments in high-impact polystyrene (HIPS). HIPS/CNT nanocomposites have been prepared by the melt–intercalation process. Thermogravimetric analysis and differential scanning calorimetry indicate that the thermal stability of HIPS/CNT nanocomposites is better than that of HIPS. The thermal degradation mechanism was investigated by pyrolysis gas chromatography mass spectrometry.

scholarly journals SYNTHESIS OF CARBON NANOTUBES BY THE ELECTRIC ARC-DISCHARGE METHOD

2020 ◽  
Vol 5 (443) ◽  
pp. 126-133
Author(s):  
Yermagambet Bolat Toleukhanuly ◽  
◽  
Kazankapova Maira Kuttybaevna ◽  
Kassenova Zhanar Muratbekovna ◽  
Nauryzbaeva Asemay Turlangyzy ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Pore Volume ◽  
Arc Discharge ◽  
Current Strength ◽  
Electric Arc ◽  
Electric Arc Discharge ◽  
Synthesis Of Carbon Nanotubes

The paper presents the synthesis of carbon nanotubes (CNTs) by the method of electric arc-discharge. To obtain CNTs, the process of an electric arc-discharge of graphite was carried out; the current strength at a constant voltage of 50 V was 120, 150, 170, 200 A (inert medium - argon). Using the methods of electron microscopy, BET and Raman scattering, the chemical composition, specific surface area were determined, and the surface morphology of the obtained samples was studied. The results of determining the specific surface area and pore volume show that with increasing current strength, the specific surface area and specific pore volume increase from 25.450 to 159.737 m2/g and from 0.011 cm3/g to 0.068 cm3/ g, respectively. Electron microscopic images show CNT particles with a diameter of 58 to 370 nm, which are rolled into a single, seamless, cylindrical shape.

Promoting effect of group VI metals on Ni/MgO for catalytic growth of carbon nanotubes by ethylene chemical vapour deposition

2015 ◽  
Vol 69 (2) ◽  
Author(s):  
Ahmed E. Awadallah
Keyword(s):  
Carbon Nanotubes ◽  
Surface Area ◽  
Chemical Vapour Deposition ◽  
Vapour Deposition ◽  
Chemical Vapour ◽  
Promoting Effect ◽  
Group Vi ◽  
Catalytic Growth ◽  
Dta Analysis ◽  
Synthesis Of Carbon Nanotubes

AbstractThe incorporation of 1 mass % of group VI metals (chromium, molybdenum, and tungsten) into 4 mass % of Ni/MgO catalysts was evaluated for the synthesis of carbon nanotubes (CNTs) by the catalytic chemical vapour deposition of ethylene. All materials were characterised by XRD, surface area, TEM, SEM, Raman spectroscopy, and TGA-DTA. The resulting data demonstrated that the addition of group VI metals improved the surface area and metal dispersion, thereby achieving a remarkable enhancement in catalytic growth activity. Among the metals of group VI, Mo was found to be the most effective promoter for catalysing the CNTs’ growth. From TEM observation, long CNTs with a higher degree of graphitization were obtained on the Ni-Mo/MgO catalyst. TGA and DTA analysis showed that the as-grown CNTs over both Ni-Mo and Ni-W/MgO catalysts exhibited higher thermal stability.

EVALUATION OF THE EFFECT OF CATALYST TEXTURAL PROPERTIES ON EFFECTIVE SYNTHESIS OF CARBON NANOTUBES

2013 ◽  
Vol 12 (04) ◽  
pp. 1350030
Author(s):  
WEI-MING YEOH ◽  
KIM-YANG LEE ◽  
KEAT-TEONG LEE ◽  
ABDUL RAHMAN MOHAMED ◽  
SIANG-PIAO CHAI
Keyword(s):  
Carbon Nanotubes ◽  
Citric Acid ◽  
Pore Size ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Textural Properties ◽  
High Yield ◽  
Polyethylene Glycol 200 ◽  
Synthesis Of Carbon Nanotubes

Co – Mo / MgO catalysts of same content but different textural properties were prepared through manipulation of foaming agents (ethylene glycol, citric acid and polyethylene glycol 200) in a sol–gel method. Experimental results indicated that surface area and pore size of the catalysts were equally important in the synthesis of carbon nanotubes (CNTs) from catalytic chemical vapor deposition. It was found that the catalysts with high surface area and large pore size were the main criteria for high yield synthesis of CNTs of better graphitized wall structure. High surface area helped in the dispersion of active metals, thus increasing the number of active sites for nucleation and growth of CNTs. Meanwhile, larger pore size facilitated better mass transfer between the inner pore and the exterior reaction atmosphere, and it provided a larger space for unrestricted growth of CNTs. In the present work, we demonstrated that the Co – Mo / MgO catalysts prepared by citric acid possessed both larger average pore size and higher surface area, which provoked the synthesis of better quality (graphitized) CNTs in high yield.

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