Studies of the Thermal Behavior of Some Polynuclear Aromatics

Lewis, I.C.; Edstrom, T.

doi:10.1016/b978-0-08-009708-4.50038-9

Cited by 3 publications

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“…The smaller PAC (2- and 3-ring) decay rapidly while the larger PAC (4- and 5-ring) exhibit higher stability as secondary pyrolysis becomes more severe; this is consistent with the findings of other researchers. ,, Stein 10 generalized these observations in terms of the thermochemical properties of PAC at high temperatures: PAC smaller than the critical ring size would tend to degrade, while larger PAC would continue to grow through polymerization. In addition, the contrast observed here between the trends for 2- and 3-ring PAC vs the larger PAC agrees with the observations by Lewis and Edstrom that three fused rings appears to be the fate-determining size; our data indicate as well that this divergence in trends occurs around 50% SF.…”

Section: Resultssupporting

confidence: 91%

Trends in Aromatic Ring Number Distributions of Coal Tars during Secondary Pyrolysis

Hildemann

Niksa

1998

Energy Fuels

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To characterize the ring number distribution of coal tars throughout secondary pyrolysis, tar samples from two coal types were fractionated via gravity flow column chromatography (GFCC), and the polycyclic aromatic compounds (PAC) in the toluene fraction were analyzed via high performance liquid chromatography (HPLC) to quantify ring number distributions. During the early stages of secondary pyrolysis, the measured ring number distributions reflect prominent features of the parent coals, but the influence of original coal structure on the ring number distribution diminishes as pyrolysis conditions become more severe. Based on the trends observed for the various ring groups, insights are gained regarding the orchestration among neutralization, polymerization, and ring rupture, as well as the predominance of various sooting pathways. During the early stages of secondary pyrolysis, neutralization represents a major mass transformation mechanism among PAC, while direct conversion of PAC to soot also appears to be a dominant pathway. As secondary pyrolysis proceeds, polymerization and ring rupture become significant, while the addition of acetylene appears to be important in contributing to soot growth. By the end of secondary pyrolysis, ring rupture appears to be the dominant mass transformation mechanism.

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Section: Resultssupporting

confidence: 91%

Trends in Aromatic Ring Number Distributions of Coal Tars during Secondary Pyrolysis

Hildemann

Niksa

1998

Energy Fuels

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“…The fact that isoot loses its radical character (Homann and Wagner, 1967) and the fact that its <C/H ratio increases as it ages support the expectation that soot does indeed becomb unreactive with age. Another reason these PAH are considered inert is that many~f them have been classified as "non-reactive" on the basis of their tendency to fJrm carbon when they are heated (Lewis and Edstrom, 1963;Sharkey et 01., 1966). But it is not obvious that this property is in any way related to surface growth.…”

Section: Identification Of Growth Speciesmentioning

confidence: 99%

Surface Growth of Soot Particles in Premixed Ethylene/Air Flames

Harris

Weiner

1983

Combustion Science and Technology

195

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The surface growth rate of soot increases steeply with increasing equivalence ratio. We have found that the increased growth rate is accounted for primarily by the increased surface area available for growth rather than by increased concentrations of surface growth species. We have shown thai the surface growth species are not depleted by the process of surface growth. Our data suggest that the surface growth seen in our flames can be accounted for primarily by reaction of acetylene with the soot particles.

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Soot Formation in Small Flames

Serageldin

1981

SAE Technical Paper Series

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Studies of the Thermal Behavior of Some Polynuclear Aromatics

Cited by 3 publications

References 0 publications

Trends in Aromatic Ring Number Distributions of Coal Tars during Secondary Pyrolysis

Trends in Aromatic Ring Number Distributions of Coal Tars during Secondary Pyrolysis

Surface Growth of Soot Particles in Premixed Ethylene/Air Flames

Soot Formation in Small Flames

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