Polyethylenimine-Impregnated Mesoporous Silica: Effect of Amine Loading and Surface Alkyl Chains on CO2 Adsorption
Polyethylenimine-Impregnated Mesoporous Silica: Effect of Amine Loading and Surface Alkyl Chains on CO2 Adsorption
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DOI：
10.1021/la202972t
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发表时间：
2011-10-18
期刊：
影响因子：
3.9
通讯作者：
Sayari, Abdelhamid
中科院分区：
文献类型：
--
作者：
Heydari-Gorji, Aliakbar;Belmabkhout, Youssef;Sayari, Abdelhamid
研究发现，表面覆盖有一层长烷基链的扩孔MCM-41负载的聚乙烯亚胺（PEI）是比相应的煅烧二氧化硅负载的PEI以及文献报道的所有PEI浸渍材料更有效的CO2吸附剂。表面烷基链层对于增强PEI的分散性、降低扩散阻力起着重要作用。研究还发现，在低温下，PEI 含量相对较低的吸附剂比高负载量的吸附剂更有效，因为吸附率更高。广泛的二氧化碳吸附-解吸循环表明，尽管由于胺蒸发造成的损失有限，但使用加湿的进料和吹扫气体可以提高材料的稳定性。
Poly(ethyleneimine) (PEI) supported on pore-expanded MCM-41 whose surface is covered with a layer of long-alkyl chains was found to be a more efficient CO2 adsorbent than PEI supported on the corresponding calcined silica and all PEI-impregnated materials reported in the literature. The layer of surface alkyl chains plays an important role in enhancing the dispersion of PEI, thus decreasing the diffusion resistance. It was also found that at low temperature, adsorbents with relatively low PEI contents are more efficient than their highly loaded counterparts because of the increased adsorption rate. Extensive CO2 adsorption-desorption cycling showed that the use of humidified feed and purge gases affords materials with enhanced stability, despite limited loss due to amine evaporation.