Department of Chemistry, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada.
Langmuir. 2011 Oct 18;27(20):12411-6. doi: 10.1021/la202972t. Epub 2011 Sep 21.
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 CO(2) 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 CO(2) 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.
孔扩张的 MCM-41 负载的聚乙烯亚胺（PEI），其表面覆盖有一层长链烷基，被发现比相应的煅烧二氧化硅负载的 PEI 和文献中报道的所有 PEI 浸渍材料更有效地吸附 CO2。表面烷基链层在增强 PEI 的分散性方面起着重要作用，从而降低了扩散阻力。还发现，在低温下，具有相对较低 PEI 含量的吸附剂比其高负载量的对应物更有效，因为吸附速率增加。广泛的 CO2 吸附-解吸循环表明，尽管由于胺蒸发而导致有限的损失，但使用加湿的进料气和吹扫气可提供稳定性增强的材料。
