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CHARACTERIZATION OF ACTIVATED CARBONS' PHYSICAL AND CHEMICAL PROPERTIES IN RELATION TO THEIR MERCURY ADSORPTION
Citation:
Li*, Y H., C W. Lee*, AND B K. Gullett*. CHARACTERIZATION OF ACTIVATED CARBONS' PHYSICAL AND CHEMICAL PROPERTIES IN RELATION TO THEIR MERCURY ADSORPTION. Presented at Carbon '01, Lexington, KY, 7/14-19/01.
Description:
The paper gives results of a characterization of the physical and chemical properties of the activated carbons used for elemental mercury (Hgo) adsorption, in order to understand the role of oxygen surface functional groups on the mechanism of Hgo adsorption by activated carbons. (NOTE: Hgo is known to be more difficult to capture thanits oxidized forms from combustion flue gases, due to its higher volatility and insolubility in water). Many studies have been carried ou to evaluate the effectivesness of Hgo adsorption by actiavted carbons. Carbon sorbent type and its associated properties have been shown to be the most important factors infouencing Hgo sorption., Different activated carbons have been examined in bench-, pilot-, and full-scale tests; however, correlations between carbon physical and chemical properties and Hgo adsorption have not been established. The mechanism involved in Hgo adsorption is not well understood. A previous study of Hgo adsorption by activated carbons performed at room temperature suggests that carbon surface moisture has a strong enhancement effect to promote Hgo adsorption. Results of the temperature-programmed desorption (TPD) measurment of adsorbed Hg and X-ray absorption fine structure (XAFS) spectroscopy analysis of surface mercury bonding suggest that chemisorption of Hgo is dominant over physisorption.