《活性炭吸附汞》PPT课件.ppt

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1、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(Molecula

2、r 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 spec

3、troscopy)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&

4、XANEs)All Hg2+No Hg0Sorbent 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 107SO2/HCl/NO/NO2 appear aloneAdsorption efficiency increased to 90-100%HCl and NO/SO2 and NO2 Adsorption efficiency red

5、uced 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

6、 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 Modification,Sang-Sup Lee,et al 2009,Chemical Modification,Sang-Sup Lee,et al 2009,Thank you for your attention!,