Formation of Polycyclic Aromatic Hydrocarbons in a Vertical Flow Reactor

Zaghini, N.; Mangolini, S.; Cornetti, G. M.; Salvatori, T.; Rizzi, G.

doi:10.1080/00102207208952526

Cited by 11 publications

(2 citation statements)

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“…Recently, many measurements of the concentrations of polynuclear aromatic species in simple aliphatic hydrocarbon flames have been reported (Crittenden & Long 1973;D 'Alessio, Di Lorenzo, B eretta & Venitozzi 1973;Zaghini et al 1972). However, a crucial difficulty arises in interpreting these measurements in th a t the im portant intermediates in the route to soot may be so reactive th a t they are rarely if ever detected, while those which are detected easily, or in substantial amounts, may be largely irrelevant to the soot-forming process.…”

Section: Soot Aerosols Generated By Pyrolysis Of Aromatic Hydrocarbons 283 Discussion (A) Soot Formation Via the Direct Routementioning

confidence: 99%

The formation and coagulation of soot aerosols generated by the pyrolysis of aromatic hydrocarbons

Graham

Homer

Rosenfeld

1975

Proc. R. Soc. Lond. A

145

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We report a study of the formation and growth of soot aerosols in incident shock flows of benzene, toluene, ethylbenzene and indene, highly diluted with argon at temperatures in the range 1600-2300 K at a total carbon concentration in the shock-heated gases of 2.0 x 1017 atoms/cm3. The extent of conversion of hydrocarbon into soot, i.e. the soot yield, during the shock flow was determined from extinction measurements at two different visible wavelengths, while the rate of growth of the soot particles was obtained from the variation in the intensity of Rayleigh scattering of a 1W argon-ion laser beam by the soot particles. Of particular interest is our finding that the soot yield some 2.5 ms after the onset of shock heating falls rapidly with increasing temperature from near 100% at 1750-1800 K to less than 5 % at 2300 K

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Section: Soot Aerosols Generated By Pyrolysis Of Aromatic Hydrocarbons 283 Discussion (A) Soot Formation Via the Direct Routementioning

confidence: 99%

The formation and coagulation of soot aerosols generated by the pyrolysis of aromatic hydrocarbons

Graham

Homer

Rosenfeld

1975

Proc. R. Soc. Lond. A

145

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“…4) The soot deposition at the wall was measured using a reactor without sampling holes in order to correlate the deposited amount with the fuel quality, as in earlier work (Zaghini et al, 1972).…”

Section: Methodsmentioning

confidence: 99%

On the Mechanism of Soot Formation in a Vertical Flow Reactor

Franceschi

Zanelli

Cornetti

1976

Combustion Science and Technology

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The formation process of carbonaceous material (soot) has been experimentally studied in order 10 explain the role of polynuclear aromatic hydrocarbons (PCAH) in that process; in particular the research has been directed to see if PCAH are byproducts or intermediate compounds.The experimental work was carried out in a vertical reactor, where the fuel was fed after mixing with oxygen and nitrogen at atmospheric pressure. The flow rate and the composition of the mixtures were such that a yellow flame was present in the reactor.The flue gas was sampled along the axis in order to determinate concentration profiles of several PCAH and of perinaphthenyl radical, which is strictly correlated to PCAH in the formation process. The soot was collected from the gas at five locations: every sample was extracted with solvent, obtaining one insoluble fraction, that was called "carbon" and a soluble one, called "tar".The concentration profiles of all the analyzed PCAH and of the perinaphthenyl radical show a maximum, which is characteristic of intermediate products: the content of soot in the flue gas increases along the reactor axis, however,if the two fractions are taken into account one can see that only the tar increases, while the carbon has a flat profile. The interpretation of those concentration profiles suggest that the PCAH and the perinaphthenyl radical certainly are intermediates in the formation process of the soluble fraction of soot (tar), which still plays a secondary role in the production mechanism of the insoluble part (carbon).

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