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Nitric oxide inhibition of soot oxidation by oxygen atoms at 298K

✍ Scribed by Brian G. Wicke; Karen A. Grady

Publisher
Elsevier Science
Year
1987
Tongue
English
Weight
622 KB
Volume
69
Category
Article
ISSN
0010-2180

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✦ Synopsis

Nitric oxide is observed to inhibit the rate of soot oxidation by oxygen atoms at 298K. Small amounts of added NO reduce the rates of production of CO2 and CO by up to 35 %. We show experimentally that NO is not reducing the gas phase O atom concentration. Thermal desorption mass spectrometry shows a small adsorption of NO on the soot; this NO adsorption corresponds to 1.5 % of the carbon atoms on the surface of the individual soot spheres. This inhibition is interpreted in terms of a relatively small number of reactive sites on the soot at which soot gasification occurs and which are effectively blocked by NO. When considered together with our previously reported work on oxidation of soot by oxygen atoms at 298K, these results allow a partial mechanism to be formulated for this soot oxidation process.

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