Chemical interactions of polycyclic organic compounds with coal fly ash and related solid surfaces. Final report, July 1, 1987--December 31, 1989

Technical Report · Thu Mar 01 04:00:00 EST 1990

DOI:https://doi.org/10.2172/10128387· OSTI ID:10128387

Mamantov, G; Wehry, E L

The interactions of polycyclic aromatic hydrocarbons (PAHs) with particulate surfaces (especially those of coal fly ash) have been investigated, and the influence of coal ash surface properties on the photochemical transformation of adsorbed PAHs has been studied. The overall objective of the work has been to characterize the effects of adsorption onto atmospheric particulate matter on the chemical behavior of PAHs released into the atmosphere via combustion processes. Progress is reported in the following areas of effort: (a) Major emphasis has been devoted to the interactions of PAHs with the different particulate phases that are found in heterogeneous coal ash samples. Techniques have been developed and thoroughly characterized for the fractionation of coal ashes into carbonaceous, mineral-magnetic, and mineral-nonmagnetic subfractions. Heats of adsorption for pyrene on such subfractions have been measured by gas-solid chromatography, and the photoreactivity of pyrene and benz[a]anthracene on ash subfractions has been examined. Carbonaceous particles exhibit the highest affinity for vapor-phase PAHS; mineral magnetic particles usually exhibit the smallest tendency to sorb PAHs from the vapor phase. Adsorption of PAHs on carbonaceous particles suppresses, virtually completely, their tendency to undergo photochemical transformation. For coal ashes that contain few carbonaceous particles, the adsorption and photochemical transformation of PAHs tend to be dominated by the mineral nonmagnetic particles; PAHs adsorbed on these particles tend to exhibit relatively efficient phototransformation.

• Research Organization: Tennessee Univ., Knoxville, TN (United States). Dept. of Chemistry
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: FG05-87ER60552
• OSTI ID: 10128387
• Report Number(s): DOE/ER/60552--2; ON: DE93008287
• Country of Publication: United States
• Language: English

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20 FOSSIL-FUELED POWER PLANTS
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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ADSORPTION
ADSORPTION HEAT
CHEMICAL AND PHYSICOCHEMICAL PROPERTIES
EXTRACTION
FLY ASH
FRACTIONATION
GAS CHROMATOGRAPHY
INTERACTIONS
NOXIOUS GAS AND PARTICULATE EMISSIONS
PHOTOCHEMISTRY
POLYCYCLIC AROMATIC HYDROCARBONS
PROGRESS REPORT
PYRENE