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五乙烯六胺(PEHA)改性MCM-41的制备及其CO_2吸附性能 被引量:4

Modification of MCM-41 with pentaethylenehexamine(PEHA)and its performance of adsorption for CO_2
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摘要 采用浸渍方法将有机胺五乙烯六胺(PEHA)负载在介孔分子筛MCM-41的孔道表面进行改性,合成一种新型CO_2吸附剂MCM-41-PEHA。运用X射线粉末衍射法(XRD)、低温N_2吸附/脱附法(BET)和热重分析法(TGA)等手段表征了吸附剂改性前后样品的结构特征及其热物理性质,并通过固定床吸附实验,对MCM-41-PEHA吸附CO_2的性能进行研究。结果表明:经过PEHA改性后,MCM-41-PEHA吸附剂仍具有MCM-41规则均一的孔道结构;随着PEHA负载量在孔道内的增加,吸附剂的比表面积和孔体积随之相应下降。在75℃下,MCM-41-PEHA的吸附量随PEHA负载量的增加而显著上升,其中当PEHA负载量为60%(质量分数)时,吸附剂在75℃和100 kPa(CO_2分压)下吸附量最高。吸附/脱附循环稳定性实验表明:PEHA改性的MCM-41分子筛吸附剂在5次吸附/脱附循环吸附操作下,CO_2吸附量基本保持不变,吸附剂性能稳定。 采用浸渍方法将有机胺五乙烯六胺(PEHA)负载在介孔分子筛MCM-41的孔道表面进行改性,合成一种新型CO<sub>2</sub>吸附剂MCM-41-PEHA。运用X射线粉末衍射法(XRD)、低温N<sub>2</sub>吸附/脱附法(BET)和热重分析法(TGA)等手段表征了吸附剂改性前后样品的结构特征及其热物理性质,并通过固定床吸附实验,对MCM-41-PEHA吸附CO<sub>2</sub>的性能进行研究。结果表明:经过PEHA改性后,MCM-41-PEHA吸附剂仍具有MCM-41规则均一的孔道结构;随着PEHA负载量在孔道内的增加,吸附剂的比表面积和孔体积随之相应下降。在75℃下,MCM-41-PEHA的吸附量随PEHA负载量的增加而显著上升,其中当PEHA负载量为60%(质量分数)时,吸附剂在75℃和100 kPa(CO<sub>2</sub>分压)下吸附量最高。吸附/脱附循环稳定性实验表明:PEHA改性的MCM-41分子筛吸附剂在5次吸附/脱附循环吸附操作下,CO<sub>2</sub>吸附量基本保持不变,吸附剂性能稳定。
出处 《化工进展》 EI CAS CSCD 北大核心 2011年第S2期143-148,共6页 Chemical Industry and Engineering Progress
基金 国家自然科学基金(20836008) 高等学校博士学科点专项科研基金(20101012174)项目
关键词 吸附 五乙烯六胺 MCM-41 CO<sub>2</sub> adsorption pentaethylenehexamine(PEHA) MCM-41 CO<sub>2</sub>
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