以椰壳活性炭为载体，进行HNO3＋TEPA复合改性和KOH＋TEPA复合改性，并考察活性炭复合改性前后对模拟烟气中CO2的吸附性能，结果表明，KOH＋TEPA复合改性后吸附性能提高，HNO3＋TEPA复合改性后吸附性能降低。KOH＋TEPA复合改性后的活性炭（OH‐TEPA‐AC）在303K条件下，对模拟烟气（10％（体积分数）CO2，90％（体积分数）N2）中CO2的静态吸附量从改性前的06．70mmol／g提高到1．182mmol／g。在303K条件下，活性炭OH‐TEPA‐AC对模拟烟气中CO2的动态吸附量稳定在09．70～1．152mmol／g间，对引入水分的烟气中CO2的吸附量稳定在11．92～12．15mmol／g间，表现出良好的循环吸附性能及对水分的稳定性。动力学分析表明，OH‐TEPA‐AC对模拟烟气中CO2的平均吸附热值为－520．kJ／mol，保证了工业实际应用的经济性。
Porous cocoanut activated carbon w as modified using tree chemical methods:tetraethylenepentamine (TEPA) modified directly (AC) ,firstly oxidized by HNO3 solution (10% ) for 4 h at 353 K then TEPA modi‐fied (HNO3 + TEPA) and firstly alkalified by KOH solution (5 mol/L) for 4 h at 353 K then TEPA modified (KOH+ TEPA) .The results show that KOH reduction on AC improved the effect of the modification ,HNO3 oxidation on AC has no significant effect on modification .The CO2 adsorption capacity of OH‐TEPA‐AC meas‐ured using a thermogravimetric analyzer (TGA ) in simulated flue gas conditions (10vol% CO2 ,90vol% N2 ) was about 1 .182 mmol/g at 303 K , the dynamic adsorption capacity was between 1 .192‐1 .215 and 0 .970‐1 1.52 mmol/g with or without the presence of water during ten cycles of adsorption/desorption .Dynamics anal‐ysis shows that the average isosteric heat of adsorption was about -52 kJ/mol ,so OH‐TEPA‐AC was likely to be satisfactory in practical applications of capturing CO2 .
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