《活性炭吸附汞》PPT课件.ppt

Mercury Adsorption by Activated Carbon in flue gas,New standard in China,GB13223-2011,flue gas Hg: 0.03mg/m3,2015,coal-fired power plant,Activated Carbon,Feasible,Reliable,Physical Adsorption & Chemical Adsorption,Physical adsorption Porous Structure Large Surface Area Adsorption of Impurities (Molecular SizePore Size) Feature: Lower Temperature, higher mercury adsorption,Physical Adsorption & Chemical Adsorption,Chemical adsorption Oxygen-containing: -COOH; COO-; Phenol; Carbonyl, et al. Surface Oxygen: Hg on the surface of activated carbon is always together with Oxygen. (X-ray absorption fine structure spectroscopy ) Active Sites,Physical Adsorption & Chemical Adsorption,Chemical adsorption closed box environment : O2 + Hg0 = no reaction O2 strengthens activated carbon adsorption at 100-300.,Bjorn Hall,Physical Adsorption & Chemical Adsorption,Frank E. Hugginsa,Chemical adsorption Adsorption form of Hg0 test (XAFS & XANEs) All Hg2+ No Hg0 Sorbent surface: I, S, Cl, O, et al. Acid gas in flue gas,Physical Adsorption & Chemical Adsorption,Stanley,Chemical adsorption Basic atmosphere: O2, CO2, N2 and water at 107 SO2/HCl/NO/NO2 appear alone Adsorption efficiency increased to 90-100% HCl and NO / SO2 and NO2 Adsorption efficiency reduced rapidly.,Physical Adsorption & Chemical Adsorption,胡长兴 Hu Changxin,Chemical adsorption,N2,CO2O2 SO2 NO2 NO HCl H2O,Hg2+,Hg0,Physical Adsorption & Chemical Adsorption,胡长兴 Hu Changxin,Chemical adsorption,Treated activated carbon 863m2/g 0.23mg/g Untreated activated carbon 53m2/g 1.85mg/g ,Which one is the dominant?,Mercede, et al,Oxygen Group is more important,Under atmospheric pressure: Physical adsorption Chemical adsorption Low temperature(75): physical adsorption High temperature(140): chemical adsorption,Which one is the dominant?,Krishnan SV & Kwon S,co-exist,Chemical Modification,Sang-Sup Lee, et al 2009,Brominated activated carbon (Br; DARCO Hg-LH) Cupric chloride-impregnated activated carbon (CuCl; C-AC),Chemical Modificati