Actions for Nitration of polynuclear aromatic hydrocarbons in coal combustors and exhaust streams. Quarterly report, January 1, 1994--March 31, 1994 [electronic resource].

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Nitration of polynuclear aromatic hydrocarbons in coal combustors and exhaust streams. Quarterly report, January 1, 1994--March 31, 1994 [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 1994.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
17 pages : digital, PDF file
Additional Creators
Stanford University. Department of Civil Engineering, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Activity during this quarter on the sample preparation side extended our capabilities to perform experiments on the oxidative pyrolysis of coal volatiles. Previously, our experiments characterized primary devolatilization and secondary volatiles pyrolysis. Now we are almost ready to report complete product distributions and to prepare PAH samples for controlled extents of oxidative pyrolysis at various oxygen levels. Tests addressed the issue of soot formation in the presence of oxygen. Our preliminary results indicate that significant amounts of the aerosol product is converted into gases before all the tar is converted into soot. Accordingly, total aerosol yields (as sum of tar plus soot) are lower than their levels after secondary pyrolysis while soot fractions (of the total aerosol product) are much less than unity. Preliminary determinations of the noncondensible gases show an abundance of CO₂ and H₂O with substantial amounts of CO and H₂ plus trace levels of CH₄, C₂H₂, and C₂H₄. However, only the elemental balance on oxygen is closed within acceptable tolerances, pending further characterization of tar, soot, and char compositions. Nitrogen species were not monitored at this stage. The final methodology for separating PAH via high-pressure liquid chromatography was selected. The accuracy of this approach for determining the ring number distribution of the PAH in the fractionated coal tar was evaluated using a range of PAH standards. It was determined that even slightly-polar substituents greatly retard the elution time of the parent PAH, to beyond the 6-ring compounds. Thus, the ring number distribution can be accurately determined for nonpolar PAH of 2 to 5 rings. Evaluation of relative response factors for each of these ring sizes has been completed.
Report Numbers
E 1.99:doe/pc/91284--10
doe/pc/91284--10
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
05/01/1994.
"doe/pc/91284--10"
"DE94014365"
"AA1525050"
Niksa, S.; Hildemann, L.M.; Cho, Sunghwan; Yu, Liya.
Type of Report and Period Covered Note
Quarterly; 01/01/1994 - 03/31/1994
Funding Information
FG22-91PC91284
View MARC record | catkey: 13838804