Sorption and chemical transformation of PAHs on coal fly ash

Technical Report · Wed Jan 01 00:00:00 EST 1992

DOI:https://doi.org/10.2172/7104665· OSTI ID:7104665

Mamantov, G; Wehry, E L

The results obtained to date indicate that toluene is a useful probe solute'' for measuring the relative affinities of various fly ash fractions for aromatic solutes. In general, the adsorption isotherms obtained for toluene on fly ash fractions can be fit to a Freundlich adsorption isotherm equation, which implies that the adsorbent surface in question is heterogeneous. For most fly ash fractions studied thus far, the measured heat of adsorption decreases as the quantity of toluene injected onto the column increases. This observation also indicates that the fly ash surfaces are heterogeneous. For a homogeneous (or nearly homogeneous) surface, virtually all adsorption sites'' for a particular solute exhibit approximately the same affinity for the solute; hence, the measured heat of adsorption is virtually independent of the amount of solute that is brought into contact with the surface. However, when the surface is heterogeneous, the measured heat of adsorption decreases as the amount of solute is increased; this variation can be used to make inferences regarding surface site energy distributions if certain assumptions and approximations are made. Data obtained to date are summarized.

• Research Organization: Tennessee Univ., Knoxville, TN (United States). Dept. of Chemistry
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FG22-91PC91306
• OSTI ID: 7104665
• Report Number(s): DOE/PC/91306-3; ON: DE93000518
• Country of Publication: United States
• Language: English

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20 FOSSIL-FUELED POWER PLANTS
COAL
COMBUSTION
FLY ASH
SORPTIVE PROPERTIES
FOSSIL-FUEL POWER PLANTS
POLYCYCLIC AROMATIC HYDROCARBONS
ADSORPTION
SIMULATION
TOLUENE
ADSORPTION ISOTHERMS
ADSORPTION HEAT
NUMERICAL DATA
PROGRESS REPORT
AEROSOL WASTES
ALKYLATED AROMATICS
AROMATICS
ASHES
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COMBUSTION PRODUCTS
DATA
DOCUMENT TYPES
ENERGY SOURCES
ENTHALPY
FOSSIL FUELS
FUELS
HYDROCARBONS
INFORMATION
ISOTHERMS
MATERIALS
ORGANIC COMPOUNDS
OXIDATION
PHYSICAL PROPERTIES
POWER PLANTS
RESIDUES
SORPTION
SURFACE PROPERTIES
THERMAL POWER PLANTS
THERMOCHEMICAL PROCESSES
THERMODYNAMIC PROPERTIES
WASTES
200202* - Fossil-Fueled Power Plants- Waste Management- Noxious Gas & Particulate Emissions