Synthesis of high purity multi-walled carbon nanotubes over Co–Mo/MgO catalyst by the catalytic chemical vapor deposition of methane

Yeoh, Wei-Ming; Lee, Kim-Yang; Chai, Siang‐Piao; Lee, Keat Teong; Mohamed, Abdul Rahman

doi:10.1016/j.carbon.2009.06.006

Cited by 6 publications

(7 citation statements)

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“…Along with nickel, the most commonly used catalyst metals are iron [29][30][31][32][33][34][35], cobalt [36][37][38] and copper [39]. When catalyst metals have been directly compared it has been found that whilst all the metals are able to produce CNTs, iron catalysts give a large yield [31,33,35,40].…”

Section: Introductionmentioning

confidence: 99%

The use of different metal catalysts for the simultaneous production of carbon nanotubes and hydrogen from pyrolysis of plastic feedstocks

Acomb

Williams

2016

Applied Catalysis B: Environmental

219

120

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Nickel, iron, cobalt and copper catalysts were prepared by impregnation and used to produce carbon nanotubes and hydrogen gas from a LDPE feedstock. A two stage catalytic pyrolysis process was used to enable large yields of both products. Plastics samples were pyrolysed in nitrogen at 600°C, before the evolved gases were passed to a second stage and allowed to deposit carbon onto the catalyst at a temperature of 800°C. Carbon nanotubes were successfully generated on nickel, iron and cobalt but were barely observed on the copper catalyst. Iron and nickel catalysts gave the largest yield of both hydrogen and carbon nanotubes as a result of metal-support interactions which were neither too strong, like cobalts, nor too weak like copper. These metal support interactions proved a key factor in CNT production. A nickel catalyst with a weaker interaction was prepared using a lower calcination temperature. Yields of both carbon nanotubes and hydrogen gas were lower on the Ni-catalyst prepared at the lower calcination temperature, as a result of sintering of the nickel particles. In addition, the catalyst prepared at a lower calcination temperature produced metal particles which were too large for CNT growth, producing amorphous carbons which deactivate the catalyst instead. Overall the iron catalyst gave the largest yield of CNTs, which is attributed to both its good metal-support interactions and irons large carbon solubility.

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Section: Introductionmentioning

confidence: 99%

The use of different metal catalysts for the simultaneous production of carbon nanotubes and hydrogen from pyrolysis of plastic feedstocks

Acomb

Williams

2016

Applied Catalysis B: Environmental

219

120

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“…The MWCNTs used in this study were synthesized by a group of researchers from the Universiti Sains Malaysia. The highly pure MWCNTs (99.8%), with nearly uniform diameter average of 6.2 nm ± 0.5 nm (mean ± standard deviation), were synthesized over magnesia-supported Co-Mo bimetallic catalysts through catalytic chemical vapour deposition [11]. Ethanol and octyl phenol ethoxylate or Triton X -100 (TX-100) at a concentration of 1% were used as dispersing agents.…”

Section: Methodsmentioning

confidence: 99%

Comparison of Properties of MWCNT/Carbon Fibre/ Epoxy Laminated Composites Prepared by Solvent Spraying Method

Dalina

Mariatti

Ishak

et al. 2014

Int. J. Automot. Mech. Eng.

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The incorporation of multi-walled carbon nanotubes (MWCNT) in laminated composites is believed to improve the mechanical and thermal properties of the composites. However, the nature of the MWCNT, which tend to agglomerate and form into ropes, restricts their dispersion in the composites. MWCNT-filled carbon fibre laminated composite was fabricated via hand lay-up followed by the vacuum bagging technique. MWCNT at different loadings of 0.5 to 1.0 vol% was dispersed by a solvent spraying method with two different dispersing agents, namely ethanol and Triton X-100. The flexural and thermal properties of the hybrid laminated composites were investigated. The CF laminated composites filled with 1.0 vol% of MWCNT dispersed in ethanol possessed better mechanical properties than other hybrid CF composites.

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“…In the absence of H 2 yield and quality both decreased. Yeoh et al obtained 304 wt.% MWCNT yield with Co-Mo/MgO catalyst using citric acid as organic additive at 800°C [46] using N 2 as an ambient gas for catalyst pretreatment and CNT growth processes. In literature large scale MWCNT synthesis was available with different catalysts.…”

Section: Cnt Growth Under Different Pretreatment and Growth Atmospheresmentioning

confidence: 99%

The effects of catalyst pretreatment, growth atmosphere and temperature on carbon nanotube synthesis using Co–Mo/MgO catalyst

Yardımcı

Selamet

2015

Diamond and Related Materials

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The growth of high quality and high yield carbon nanotubes (CNTs) by catalytic chemical vapor deposition (CVD) of CH 4 over Co-Mo/MgO catalyst was investigated for different growth temperatures and H 2 flow rates. It was observed that CNT yield decreased with the H 2 flow rate, however, quality increased with increasing H 2 flow rate. CNT yield increased for the temperatures 850-950°C but dropped significantly above 950°C. In this study, the highest yield of 1526% was obtained at the growth temperature of 950°C. The optimum H 2 flow rate was 200 sccm; this rate gave both high graphitization and high yield of product. Various CNT growth atmospheres including Ar, H 2 and the mixture of both gases were also analyzed and it was observed that the highest quality CNTs were obtained for both pretreatment and growth carried out with H 2 . This gave a high yield of 292%. On the other hand, CNT growth carried out under Ar atmosphere gave higher CNT yield of 368%, however, the CNTs grown with Ar were more defective and had larger diameters. Prime novelty statement: We demonstrate a sorbitol added catalysis synthesis method and importance of the ideal growth conditions to improve high quality single walled carbon nanotube yield up to 1500%.

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Synthesis of high purity multi-walled carbon nanotubes over Co–Mo/MgO catalyst by the catalytic chemical vapor deposition of methane

Cited by 6 publications

References 0 publications

The use of different metal catalysts for the simultaneous production of carbon nanotubes and hydrogen from pyrolysis of plastic feedstocks

The use of different metal catalysts for the simultaneous production of carbon nanotubes and hydrogen from pyrolysis of plastic feedstocks

Comparison of Properties of MWCNT/Carbon Fibre/ Epoxy Laminated Composites Prepared by Solvent Spraying Method

The effects of catalyst pretreatment, growth atmosphere and temperature on carbon nanotube synthesis using Co–Mo/MgO catalyst

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