Sulfur dioxide adsorption over activated lignite char prepared from fluidized bed pyrolysis

Gravimetric analysis was carried out to investigate the relationship between SO 2 adsorption capacity and pyrolysis conditions for chars prepared from fluidized bed pyrolysis of lignite at various conditions. It was found that pyrolysis temperature was the primary variable affecting SO 2 adsorption...

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Bibliographic Details
Published in:Chemical engineering science 1994, Vol.49 (24), p.4483-4489
Main Authors: Lee, Joong Kee, Juh, Dong Jin, Park, Dalkeun, Park, Sunwon
Format: Article
Language:English
Subjects:
Adsorption
Applied sciences
Atmospheric pollution
Carbon
Exact sciences and technology
Gases
General processes of purification and dust removal
Gravimetric analysis
Multilayers
Oxidation
Oxygen
Pollution
Prevention and purification methods
Pyrolysis
Steam
Sulfur dioxide
Temperature
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Summary:Gravimetric analysis was carried out to investigate the relationship between SO 2 adsorption capacity and pyrolysis conditions for chars prepared from fluidized bed pyrolysis of lignite at various conditions. It was found that pyrolysis temperature was the primary variable affecting SO 2 adsorption capacity of chars while effects of steam and oxygen concentration in the fluidizing gas were not significant within the range of experimental conditions. The maximum SO 2 adsorption capacity of chars was observed at the pyrolysis temperature of about 700°C. This can be attributed to oxygen functional groups on carbons which are believed to adsorb SO 2 through oxidation. Paucity of them can lead to poor SO 2 adsorption capacity of carbons. However, too many of them per unit surface area is expected to hinder the adsorption through repulsive interactions of adsorbed SO 2 present in the adsorbed multilayer. Therefore there exists an optimal amount of oxygen-functional groups on the carbon surface for the maximum SO 2 adsorption capacity.
ISSN:0009-2509
1873-4405
DOI:10.1016/S0009-2509(05)80034-X