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Carbon in diesel participate matter: Structure, microwave absorption, and oxidation

Published online by Cambridge University Press:  03 March 2011

V. Suresh Babu ,
L. Farinash  and
M.S. Seehra
V. Suresh Babu
Affiliation:
Department of Physics, P.O. Box 6315, West Virginia University. Morgantown, West Virginia 26506-6315
L. Farinash
Affiliation:
Department of Physics, P.O. Box 6315, West Virginia University. Morgantown, West Virginia 26506-6315
M.S. Seehra
Affiliation:
Department of Physics, P.O. Box 6315, West Virginia University. Morgantown, West Virginia 26506-6315
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Abstract

The structural, microwave absorption, and oxidation characteristics of diesel particulate matter (DPM) collected from a CAT 3304 diesel engine are reported. The x-ray diffraction of DPM yields the characteristic peaks of pregraphitic carbons (cokes and pitches), and its modeling yields d(002) ≍ 3.429 Å and a crystallite size of about 20 Å. The real and imaginary parts of the dielectric constant ∊ = ∊′ + i∊″ are measured at 8.7 GHz using the cavity perturbation technique. The measured values for the DPM are ∊′ = 8.6 ± 1.7 and ∊″ = 7.4 ± 1.5, compared to ∊′ ≍ 1.0 and ∊″ ≍ 6 × 10−5 for the ceramic trap material used for collecting DPM. The oxidation products of the DPM, analyzed by FTIR spectroscopy, are found to contain CO2 and CO with a peak yield occurring around 500 °C. Since microwave power absorption is proportional to ∊″, these results show that selective microwave heating of the DPM in the ceramic traps should be a very efficient process with CO2 and CO as the main oxidation products.

Type
Communication
Information
Journal of Materials Research , Volume 10 , Issue 5 , May 1995 , pp. 1075 - 1078
Copyright
Copyright © Materials Research Society 1995

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