title: Catalytic regeneration of mercury sorbents.
abstract: Traditionally, mercury sorbents are disposed of in landfills, which may lead to contamination of soil and groundwater. In this work, the regeneration of activated carbon (AC) as a mercury sorbent was investigated. The decomposition of HgCl2 on the surface of pure AC was studied, as well as sorbent which has been treated with FeCl3 or NaCl. In all cases, the sorbent is found to be structurally stable through a single regeneration, which is verified through BET, XRD, and XPS analysis. The desorption of mercury from the sorbent is found to follow Henry's law. Additionally, a kinetic analysis suggests that although the presence of activated carbon lowers the energy requirement for the desorption of mercury, it significantly decreases the rate by decreasing the concentration of the HgCl2. FeCl3 and NaCl both promoted the decomposition of HgCl2, but FeCl3 did so more significantly, increasing the rate constants by a factor of 10 and decreasing the activation energy for the decomposition of HgCl2 by 14% to 40%.
authors.affiliation: Department of Chemical and Petroleum Engineering, University of Wyoming, Laramie, WY 82071, United States.
authors.forename: Mark
authors.initials: M
authors.lastname: Bentley
authors.forename: Maohong
authors.initials: M
authors.lastname: Fan
authors.forename: Bryce
authors.initials: B
authors.lastname: Dutcher
authors.forename: Mingchen
authors.initials: M
authors.lastname: Tang
authors.forename: Morris D
authors.initials: MD
authors.lastname: Argyle
authors.forename: Armistead G
authors.initials: AG
authors.lastname: Russell
authors.forename: Yulong
authors.initials: Y
authors.lastname: Zhang
authors.forename: M P
authors.initials: MP
authors.lastname: Sharma
authors.forename: Susan M
authors.initials: SM
authors.lastname: Swapp
mesh_terms: D000327:Adsorption; D002244:Carbon / Q000737:chemistry*; D002384:Catalysis; D002712:Chlorides / Q000737:chemistry*; D004785:Environmental Pollutants / Q000737:chemistry*; D005290:Ferric Compounds / Q000737:chemistry*; D007700:Kinetics; D008627:Mercuric Chloride / Q000737:chemistry*; D008956:Models, Chemical; D059027:Recycling / Q000379:methods*; D012965:Sodium Chloride / Q000737:chemistry*; D018505:Waste Management / Q000379:methods
chemical_list: D002712:Chlorides; D004785:Environmental Pollutants; D005290:Ferric Compounds; D012965:Sodium Chloride; D008627:Mercuric Chloride; D002244:Carbon; C024555:ferric chloride
keywords: Catalytic regeneration; HgCl(2) decomposition; Mercury removal