High growth of SWNTs and MWNTs from C2H2 decomposition over Co–Mo/MgO catalysts

Shajahan,; Mo, Youngjun; Kibria, A.K.M. Fazle; Kim, M.J; Nahm, Kee-Suk

doi:10.1016/j.carbon.2004.04.038

Cited by 68 publications

(15 citation statements)

References 29 publications

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“…Flahaut et al [13] reported the formation of (Mg, Co, Mo)O solid solutions, which showed large diameter MWCNTs (inner diameter ~9 nm) having up to 13 graphene walls due to the used of high Mo content. It has commonly been accepted that the addition of Mo within transition metals like Fe, Co, or Ni increases the carbon yield and induces large diameter MWCNTs with defective structures at the side walls [5,[13][14][15][16][17]. The realization of highly homogeneous catalyst nanoparticles with uniform size using a simple and low cost process is still a hot issue.…”

Section: Synthesis and Characterization Of Cntsmentioning

confidence: 99%

Synthesis of thin-multiwalled carbon nanotubes by Fe-Mo/MgO catalyst using sol-gel method

Dubey¹,

Choi²,

Kim³

et al. 2012

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The sol-gel technique has been studied to fabricate a homogeneous Fe-Mo/MgO catalyst. Ambient effects (air, Ar, and H 2 ) on thermal decomposition of the citrate precursor have been systematically investigated to fabricate an Fe-Mo/MgO catalyst. Severe agglomeration of metal catalyst was observed under thermal decomposition of citrate precursor in air atmosphere. Ar/H 2 atmosphere effectively restricted agglomeration of bimetallic catalyst and formation of highly-dispersed Fe-Mo/MgO catalyst with high specific surface-area due to the formation of Fe-Mo nanoclusters within MgO support. High-quality thin-multiwalled carbon nanotubes (t-MWCNTs) with uniform diameters were achieved on a large scale by catalytic decomposition of methane over Fe-Mo/MgO catalyst prepared under Ar-atmosphere. The produced t-MWCNTs had outer diameters in the range of 4-8 nm (average diameter ~6.6 nm) and wall numbers in the range of 4-7 graphenes. The as-synthesized t-MWCNTs showed product yields over 450% relative to the utilized Fe-Mo/MgO catalyst, and indicated a purity of about 85%.

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Section: Synthesis and Characterization Of Cntsmentioning

confidence: 99%

Synthesis of thin-multiwalled carbon nanotubes by Fe-Mo/MgO catalyst using sol-gel method

Dubey¹,

Choi²,

Kim³

et al. 2012

Carbon letters

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“…The features observed below 500°C are similar to those observed for monometallic Fe oxide catalyst supported on alumina, which have been related to the three phases of reduction of iron oxide in the form of hematite to metallic Fe (transformation of Fe 2 O 3 f Fe 3 O 4 f FeO f Fe). 9 The high temperature peak (∼830°C), which could be related to residual oxygen in the smaller metal particles 10 and the effect of Mo, shows that the common reduction procedure 11,12 at ∼500°C under a flow of He/H 2 is not enough to completely reduce the metal catalyst in † Honda Research Institute USA Inc. ‡ Rice University. the sample.…”

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confidence: 99%

Low-Temperature Single-Wall Carbon Nanotubes Synthesis: Feedstock Decomposition Limited Growth

et al. 2008

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We report on the lowest temperature of SWCNT growth using endothermic decomposition of CH4 gas on a specially activated alumina-supported Fe:Mo catalyst. However, the observed lowest growth temperature (560 °C) is higher than that reported previously for exothermic feedstock type. Our observation indicates that the decomposition threshold temperature of the feedstock limits the SWCNT growth. This study also suggests that, by using more active carbon feedstock or somehow facilitating its decomposition, one could enable the synthesis of SWCNT at an even lower temperature.

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“…The study shows that the yield of CNT preparation significantly depends on metal particles on supported catalysts. Increase of catalyst nanoparticle loading and good dispersion are useful ways to obtain a high yield of CNTs [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of new processes to achieve a high yield of carbon nanotubes by CVD method

Taleshi

2012

Int Nano Lett

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In this study, we describe the synthesis of carbon nanotubes (CNTs) by chemical vapor deposition at 500°C to 975°C, over Co 3 O 4 /MgO catalyst. The size of Co 3 O 4 nanoparticles is controlled by changing cobalt nitrate concentration in aqueous solution by impregnation method. The main object of this study is the synthesis of CNTs that started suddenly without any preheating of catalyst nanoparticles. The effect of sudden initiation and conventional preheating processes of catalyst nanoparticles on yield of CNTs was then described. The results suggest that this sudden initiation of synthesis process affects the carbon yield and morphology of CNTs.

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High growth of SWNTs and MWNTs from C2H2 decomposition over Co–Mo/MgO catalysts

Cited by 68 publications

References 29 publications

Synthesis of thin-multiwalled carbon nanotubes by Fe-Mo/MgO catalyst using sol-gel method

Synthesis of thin-multiwalled carbon nanotubes by Fe-Mo/MgO catalyst using sol-gel method

Low-Temperature Single-Wall Carbon Nanotubes Synthesis: Feedstock Decomposition Limited Growth

Evaluation of new processes to achieve a high yield of carbon nanotubes by CVD method

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