Sorption and chemical transformation of PAHs on coal fly ash

Technical Report · Wed Jan 01 04:00:00 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: DOE; 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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ADSORPTION
ADSORPTION HEAT
ADSORPTION ISOTHERMS
AEROSOL WASTES
ALKYLATED AROMATICS
AROMATICS
ASHES
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COAL
COMBUSTION
COMBUSTION PRODUCTS
DATA
DOCUMENT TYPES
ENERGY SOURCES
ENTHALPY
FLY ASH
FOSSIL FUELS
FOSSIL-FUEL POWER PLANTS
FUELS
HYDROCARBONS
INFORMATION
ISOTHERMS
MATERIALS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDATION
PHYSICAL PROPERTIES
POLYCYCLIC AROMATIC HYDROCARBONS
POWER PLANTS
PROGRESS REPORT
RESIDUES
SIMULATION
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
THERMAL POWER PLANTS
THERMOCHEMICAL PROCESSES
THERMODYNAMIC PROPERTIES
TOLUENE
WASTES