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Title: SYNTHESIS OF CARBON NANOTUBES BY CHEMICAL VAPOR DEPOSITION OF CH4/H2 MIXTURES: EXPERIMENTAL STUDY AND COMPUTER MODELING
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SYNTHESIS OF CARBON NANOTUBES BY CHEMICAL VAPOR DEPOSITION OF CH4/H2 MIXTURES: EXPERIMENTAL STUDY AND COMPUTER MODELING
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1314-2704
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English
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20
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6.1
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The aim of this work is to experimentally study the synthesis of carbon nanotubes and nanofibers by catalytic pyrolysis of methane-hydrogen mixtures, as well as to develope a kinetic scheme that takes into account the accelerating and suppressing effect of hydrogen on pyrolysis. Carbon nanotubes were synthesized in a laboratory kinetic setup with a vertical quartz reactor at a temperature of 700?. The oxide system (Fe0.45Co0.15Al0.40)2O3 obtained by combustion method was taken as a catalyst. The hydrogen concentration in the initial gas mixture was 0, 20, 40, and 60% vol. Electron microscopy of the obtained carbon material was performed on a LEO 912AB Omega transmission electron microscope at an accelerating voltage of 100 kV. As a result of synthesis, carbon nanotubes were obtained with a small admixture of bamboo-type carbon nanofibers with an outer diameter of 10-20 nm. At a hydrogen concentration of 40%, the maximum carbon yield is reached, which is approximately 3 times higher than with the pyrolysis of undiluted methane. A kinetic scheme of pyrolysis was developed, which made it possible to describe the accelerating and suppressing effect of hydrogen and provide a good agreement between the experimental and calculated data.
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conference
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20th International Multidisciplinary Scientific GeoConference SGEM 2020
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20th International Multidisciplinary Scientific GeoConference SGEM 2020, 18 - 24 August, 2020
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Proceedings Paper
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STEF92 Technology
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International Multidisciplinary Scientific GeoConference-SGEM
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SWS Scholarly Society; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Russian Acad Sci; Serbian Acad Sci & Arts; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; European Acad Sci, Arts & Letters; Acad Fine Arts Zagreb Croatia; C
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133-140
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18 - 24 August, 2020
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website
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cdrom
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7526
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carbon nanotubes; chemical vapor deposition; kinetic scheme; computer modeling
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