The Kinetics of Decomposition of Acetylene in the 1500°K. Region<sup>1</sup>

Palmer, Howard B.; Dormish, Frank L.

doi:10.1021/j100788a049

Cited by 52 publications

(15 citation statements)

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“…Secondly, their measured activation energy can be reasonably attributed to surface reaction of acetylene. Silcock has reported an activation energy of 179 kJ · mol −1 for the heterogeneous decomposition of acetylene in a temperature range of 625-745 K. 45 We have attributed the measured activation energy of 159 kJ · mol −1 to the surface reaction of acetylene from 873 K to 1000 K. Palmer and Domish have reported an activation energy of 109 kJ · mol −1 for the heterogeneous decomposition of acetylene from 1333 K to 1528 K. 46 Therefore it is reasonable that the Cambridge and Korea groups reported an activation energy around 120 kJ · mol −1 in the temperature range of 1073-1373 K. 42 43 For PECVD growth of CNTs, the measured activation energies are far less than that of thermal CVD. 21 41 42 The Cambridge group finally attributed the extremely low activation energies to surface diffusion.…”

Section: Diffusion Limited or Surface Reactionmentioning

confidence: 93%

“…Note that acetylene can also heterogeneously decompose over carbon particles formed on the catalyst's surface. 46 Therefore, rather than a monolayer of carbon atom, amorphous carbon will formed over the catalyst's surface in case of high acetylene feed-in. Tibbetts and colleagues have proposed a adsorption diffusion isotherm model for this situation, but they omitted the heterogeneous decomposition step.…”

Section: Limitations Of Our Modelmentioning

confidence: 99%

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A Vapor-Liquid-Solid Model for Chemical Vapor Deposition Growth of Carbon Nanotubes

Jiang

Chen²,

Liu³

et al. 2007

j nanosci nanotechnol

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Although carbon nanotubes (CNTs) with a variety of morphologies have been successfully synthesized, there is no clear physical picture of the growth process. Correspondingly, the growth mechanism is still not clear up to now. Here we suggest a VLS model for the growth process of CNTs, which involves a liquid or liquid-like state catalyst. The basic idea is that, due to the high thermal conductivity and nanometer size of the catalyst and the fast diffusion of carbon atoms in it, both the temperature and the carbon atom distribution across it are uniform. The supersaturation level can be expressed as a function of the carbon concentration and temperature, which determines the nucleation dynamics and growth kinetics. Based on this model, the growth rate equation was obtained to describe the growth kinetics of carbon nanotubes, which shows good accordance with the experimental results.

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Section: Diffusion Limited or Surface Reactionmentioning

confidence: 93%

Section: Limitations Of Our Modelmentioning

confidence: 99%

A Vapor-Liquid-Solid Model for Chemical Vapor Deposition Growth of Carbon Nanotubes

Jiang

Chen²,

Liu³

et al. 2007

j nanosci nanotechnol

View full text Add to dashboard Cite

show abstract

“…The simplest will be butadiene and the next is hexatriene-1,3,5. The cis-conformation of this species is capable of isomerizing to cyclohexadiene-1, 3 with an activation energy of only 29 kcal [17].…”

Section: Initiation Processesmentioning

confidence: 99%

“…Thus all early efforts to provide a mechanism assumed it was a relatively simple free radical mechanism [1, 3,9,10]. These efforts were limited by the lack of accurate thermochemical data on both molecules and radicals and frequently used what are now considered, grossly incorrect heats of formation, rate constants or both.…”

Section: Introductionmentioning

confidence: 99%

Radical processes in the pyrolysis of acetylene

Benson

1992

Int J of Chemical Kinetics

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The literature on the pyrolysis of acetylene below 1000 K is reviewed and it is shown that the reaction is a radical chain polymerization initiated by H atoms. The induction period is examined and shown to arise from a rapid autocatalysis produced by the very first product, vinyl acetylene. Data from studies of acetylene polymerization induced by vinyl acetylene and styrene are examined and shown to be in good qualitative agreement with the radical chain process presented. Measured and where needed, estimated rate constants are given to produce numerical estimates of chain length, rates of polymerization, induction period, and rates of initiation. It is further shown that all the products of the polymerization are capable of efficiently initiating chains in the system. An examination of the possible kinetics of vinylidene shows that it does not play any role in acetylene chemistry.

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“…The mechanism of pyrolysis of acetylene is not fully established, but Palmer & Dormish (193) proposed a possible mechanism into which both the low temperature data, the high temperature shock tube results, and hot flow reactor observations may be fitted. (103 kcal) .…”

Section: Em" Moie-1 Sec'mentioning

confidence: 99%

Shock Waves

Bauer¹

1965

Annu. Rev. Phys. Chem.

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The Kinetics of Decomposition of Acetylene in the 1500°K. Region¹

Cited by 52 publications

References 4 publications

A Vapor-Liquid-Solid Model for Chemical Vapor Deposition Growth of Carbon Nanotubes

A Vapor-Liquid-Solid Model for Chemical Vapor Deposition Growth of Carbon Nanotubes

Radical processes in the pyrolysis of acetylene

Shock Waves

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The Kinetics of Decomposition of Acetylene in the 1500°K. Region1

Cited by 52 publications

References 4 publications

A Vapor-Liquid-Solid Model for Chemical Vapor Deposition Growth of Carbon Nanotubes

A Vapor-Liquid-Solid Model for Chemical Vapor Deposition Growth of Carbon Nanotubes

Radical processes in the pyrolysis of acetylene

Shock Waves

Contact Info

Product

Resources

About

The Kinetics of Decomposition of Acetylene in the 1500°K. Region¹