Adsorption kinetics of vapor-phase m-xylene on coal fly ash

Adsorption kinetics for the aromatic hydrocarbon m-xylene and fly ash are presented. Fly ash is an active adsorbent of polycyclic aromatic hydrocarbons, and more than 10 super(8) metric tons of fly ash were emitted in the US in 1980. The experimental kinetic analyses were performed on two types of f...

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Bibliographic Details
Published in:Environmental science & technology 1991-05, Vol.25 (5), p.930-935
Main Authors: Rothenberg, Simon J, Mettzler, Glen, Poliner, Jeff, Bechtold, William E, Eidson, Arthur F, Newton, George J
Format: Article
Language:English
Subjects:
Applied sciences
Atmospheric pollution
Combustion and energy production
Exact sciences and technology
Pollution
Prevention and purification methods
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Summary:Adsorption kinetics for the aromatic hydrocarbon m-xylene and fly ash are presented. Fly ash is an active adsorbent of polycyclic aromatic hydrocarbons, and more than 10 super(8) metric tons of fly ash were emitted in the US in 1980. The experimental kinetic analyses were performed on two types of fly ash from commercial power plants and one type from an experimental fluidized-bed combustor. Rate constants and adsorption half-times were compared to fly ash residence times in coal combustion power plant stacks. Kinetics of m -xylene adsorption by fly ash were similar to kinetics for penetration of absorbates into porous adsorbents. Adsorption rates did not increase with increased temperature, and rate constants decreased with increased vapor pressure. Adsorption appeared to be limited by diffusion.
ISSN:0013-936X
1520-5851
DOI:10.1021/es00017a016