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OALib Journal期刊
ISSN: 2333-9721
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四乙烯五胺修饰介孔硅胶吸附co2性能的研究
, PP. 108-115
Keywords: 介孔硅胶,四乙烯五胺,聚乙二醇,co2吸附
Abstract:
？采用浸渍法将四乙烯五胺(tepa)负载到介孔硅胶(sg)上,制备了一系列胺功能化的co2吸附材料(tepa-sg).利用傅里叶变换红外光谱(ft-ir)、热重分析(tga)和n2吸脱附等分析方法对样品进行了表征,并在固定床反应器中考察了tepa负载量、吸附温度对co2吸附性能的影响,同时通过添加不同质量分数的聚乙二醇(peg)考察了羟基对吸附性能及再生性能的促进作用.结果表明,当tepa负载量为40%(质量分数)、吸附温度为70℃时,tepa-sg的吸附量高达2.21mmol/g;peg的加入改变了氨基与co2的相互作用机理,当tepa与peg的质量比为3:1,总负载量为40%时,co2的吸附量为2.70mmol/g,且经过10次吸脱附循环实验后,co2吸附量仍保持在2.66mmol/g,表现出较好的循环稳定性.clausius-clapeyron方程计算得该过程的等量吸附热为30~40kj/mol,且随吸附量的增大等量吸附热逐渐减小,表明tepa30/peg10-sg吸附剂表面存在能量不均匀性.
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