Methane pyrolysis: thermodynamics

Guéret, C.; Daroux, M.; Billaud, Francis

doi:10.1016/s0009-2509(96)00444-7

Cited by 215 publications

(163 citation statements)

References 7 publications

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“…Acetylene production was then seen to increase at high microwave power when arcing was present. These results are in accord with earlier data for the oligomerization of methane via microwave plasmas [94]. Thus, the occurrence of a CH 4 plasma with arcing can lead to the establishment of a high temperature gradient within the catalyst.…”

Section: Oxidative Coupling Of Methane To Higher Hydrocarbonssupporting

confidence: 92%

Applications of microwave dielectric heating in environment-related heterogeneous gas-phase catalytic systems

Zhang

Hayward

2006

Inorganica Chimica Acta

171

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The application of microwave dielectric heating in a range of environment-related heterogeneous catalytic reaction systems has been reviewed. The reactions investigated include the decomposition of hydrogen sulfide, the reduction of sulfur dioxide with methane, the reformation of methane by carbon dioxide, the hydrodesulfurization of thiophene, and the oxidative coupling of methane. The interaction of microwave irradiation with heterogeneous catalytic systems and its consequence for the microwave heating behaviour of catalysts have been examined. The effect/mechanism of microwave dielectric heating on heterogeneous catalytic reaction systems has also been discussed.

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Section: Oxidative Coupling Of Methane To Higher Hydrocarbonssupporting

confidence: 92%

Applications of microwave dielectric heating in environment-related heterogeneous gas-phase catalytic systems

Zhang

Hayward

2006

Inorganica Chimica Acta

171

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“…It was also observed by Lane et al that no reaction occurred for temperatures less than 850 • C when methane was fed without oxygen, and this is consistent with studies on methane pyrolysis that have indicated that methane is converted at temperatures greater than 1000 • C [27,28]. However, when oxygen was present, methane conversion was observed to occur at much lower temperatures, 600-850 • C. This observation indicated that some type of gas-phase oxygen species was required to activate methane at these lower temperatures.…”

Section: Reaction Of Methane With Oxygen In Absence Of Catalystsupporting

confidence: 85%

Oxidative coupling of methane using microwave dielectric heating

Zhang

Lee

Mingos

et al. 2003

Applied Catalysis A: General

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Microwave heating was applied in the oxidative coupling of methane to higher hydrocarbons over alumina supported La 2 O 3 /CeO 2 catalysts. It was found that microwave heating had a dramatic effect on the reaction when methane was converted into C 2 hydrocarbons in the absence of oxygen, with products produced at measured temperatures about 250 • C lower than those observed with conventional heating. It was shown that the reaction in the absence of oxygen occurred primarily in the gas phase and it was the localised heating of the methane that was responsible for the increased reaction rate. However, it was observed that microwave heating did not produce significant "special microwave effects" which affected the product species formed when the oxidative coupling reaction occurred in the presence of oxygen.

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“…Interestingly, also well-documented is the generation of high molecular weight species by the pyrolysis process, including polycyclic aromatic hydrocarbons, tar and coke. As a matter of fact, at temperatures above 850 1C, solid carbon and hydrogen are thermodynamically more favoured than any other hydrocarbon products 33 . Collectively, these results suggest that the chemistry between graphitic carbon structures and pyrolysis products is rich and may be exploited for SWCNT growth.…”

Section: What Is the Mechanism Of The Vpe-based Swcnt Cloning?mentioning

confidence: 99%

Chirality-controlled synthesis of single-wall carbon nanotubes using vapour-phase epitaxy

et al. 2012

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Chirality-controlled synthesis of single-wall carbon nanotubes with predefined chiralities has been an important but elusive goal for almost two decades. Here we demonstrate a general strategy for producing carbon nanotubes with predefined chiralities by using purified singlechirality nanotubes as seeds for subsequent metal catalyst free growth, resembling vapourphase epitaxy commonly used for semiconductor films. In particular, we have successfully synthesized (7, 6), (6, 5) and (7, 7) nanotubes, and used Raman spectroscopy to show unambiguously that the original chiralities of the nanotube seeds are preserved. Furthermore, we have performed electrical measurements on synthesized individual (7, 6) and (6, 5) nanotubes, confirming their semiconducting nature. The vapour-phase epitaxy approach is found to be highly robust and should enable a wide range of fundamental studies and technological developments.

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Methane pyrolysis: thermodynamics

Cited by 215 publications

References 7 publications

Applications of microwave dielectric heating in environment-related heterogeneous gas-phase catalytic systems

Applications of microwave dielectric heating in environment-related heterogeneous gas-phase catalytic systems

Oxidative coupling of methane using microwave dielectric heating

Chirality-controlled synthesis of single-wall carbon nanotubes using vapour-phase epitaxy

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