Nitration of polynuclear aromatic hydrocarbons in coal combustors and exhaust streams. Quarterly report, October 1, 1993--December 31, 1993 [electronic resource]
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| Online Access: |
Online Access |
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| Corporate Authors: | , |
| Format: | Government Document Electronic eBook |
| Language: | English |
| Published: |
Washington, D.C. : Oak Ridge, Tenn. :
United States. Dept. of Energy ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy,
1994.
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| Subjects: |
| Abstract: | During the period October 1, 1993 to December 31, 1993, the PAH preparation project at SRI International and the development of analytical methods for PAH proceeded smoothly without any major obstacles. Activity during this quarter focused on validating the performance of the PAH preparation facility against past results from the radiant coal flow experiment for secondary coal volatiles pyrolysis, now that all laboratory facilities used to prepare PAH for this project have been restored to working condition at SRI International. Dr. Cho first ran numerous tests with coal to qualify his experimental techniques against our current database. The data show the correct qualitative features, very good reproducibility, and good consistency with past results. The ultimate yield for primary devolatilization is not achieved at 1380 K, but an asymptotic value of 50 wt. % is observed at all higher temperatures. This value is reproduced to within about 2 wt. %. Also, the sum of the yields of tar and soot is constant at all temperatures, as it should be because it is invariant throughout secondary pyrolysis. Finally, the soot fraction increases monotonically for hotter furnace temperatures, but in a surprisingly nonlinear way at low temperatures. Work also continued this quarter on optimizing the HPLC analysis procedures to give reproducible, quantitative results for the PAH ring number distribution. Substantial improvement in analytical performance has been obtained by installing a new chromatographic column, and further improvements have resulted from modifying the eluent composition and sample preparation procedures. Utilizing this improved analytical method, a preliminary calibration curve for the ring number distribution of 3- to 6-ring PAH has been obtained. |
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| Item Description: | Published through the Information Bridge: DOE Scientific and Technical Information. 03/01/1994. "doe/pc/91284--9" "DE94010742" "AA1525050" Niksa, S.; Hildemann, L.; Cho, Sunghwan; Yu, Liya. |
| Physical Description: | 17 p. : digital, PDF file. |
| Type of Report and Period Covered Note: | Quarterly; |