TEPA改性新型多孔碳酸镁对烟气中CO2的吸附性能

Adsorption of CO2 in flue gas on TEPA-modified novel porous magnesium carbonate

将四乙烯五胺(TEPA)通过浸渍法负载到新型多孔碳酸镁载体上,制备了高效CO2固态胺吸附剂。采用N2吸附脱附、傅里叶红外光谱(FTIR)和扫描电子显微镜(SEM)等方法对吸附剂进行了结构和物化性质表征,并在固定床中研究了TEPA负载量、反应温度和烟气组分(H2O、NO和SO2)对CO2固态胺吸附剂吸附性能的影响。结果表明,TEPA改性后的多孔碳酸镁对CO2的吸附量有显著提高,当负载质量分数为20%时,吸附剂(20T-M)在348K下达到最大吸附量(0.95mmol/g)。烟气中水分体积分数为10%时,CO2吸附量可增加20%,NO对CO2吸附性能几乎无影响,而酸性较强的SO2可抑制CO2与胺的结合。10次循环吸脱附实验结果表明,20T-M在干燥和水分存在条件下均表现出良好的稳定性与再生性。

Tetraethylene pentamine(TEPA)was impregnated on a novel porous magnesium carbonate support to prepare a high efficient solid amine adsorbent.The structure and physicochemical properties of the adsorbent were characterized by N2 adsorption desorption,FTIR and SEM.The effects of TEPA loading,reaction temperature and flue gas components(H2O,NO and SO2)on the CO2 adsorption performance of solid amine adsorbent were investigated in a fixed bed.The results showed that modifying porous magnesium carbonate by TEPA significantly improved its CO2 adsorption capacity.When the loading of TPEA was 20%by mass,the adsorbent(20T-M)reached a maximum adsorption capacity of 0.95 mmol/g at 348K.When the moisture content of flue gas is 10%by volume,the CO2 adsorption capacity can be increased by 20%.NO has little effect on CO2 adsorption capacity,while SO2 can inhibit the combination of CO2 and amine due to its stronger acidity.The results of 10 adsorption/desorption cycles showed that 20T-M exhibited good stability and reproducibility under dry or moisture conditions.