中文摘要：

为实现廉价高效的二氧化碳捕集，新型燃烧后CO2捕集固体吸附材料的设计和开发具有重要的研究意义。为提高C02吸附量，胺功能化改性吸附剂的方法主要有湿浸渍和表面嫁接。基于此，提出了“混合胺”修饰的概念，把湿浸渍和表面嫁接两种改性技术结合起来。把3-氨丙基三甲氧基硅烷（APTs）嫁接到分子筛SBA-15孔道表面，再把聚乙烯亚胺（PEI）浸渍到载体孔道的间隙，制备出高密度胺功能化的CO2吸附剂。主要考察了不同含量的PEI和APTS功能化SBA-15的结构性能、C02吸附量及胺吸附效率。CO2吸附结果表明，混合胺功能化SBA-15吸附主要依赖于动力学扩散。其中，SBA．15-（APTS．0．5-PEI-50），SBA-15-（APTS．1．0-PEI-50）和SBA-15-（APTS．2．0-PEI-30）在75℃时具有很好的吸附潜力。混合胺功能化SBA-15的胺吸附效率介于单纯嫁接和单纯浸渍的胺功能化SBA-15之间。

英文摘要：

To achieve an economical and effective approach of CO2 capture, design of novel adsorbents for post-combustion CO2 adsorption has important significance. To improve CO2 adsorption capacity, two methods of wet impregnation and surface grafting have been used recently. ＂Mixed-amine＂ concept was proposed and these two methods were combined in this paper. 3-Aminopropyltrimethoxysilane （APTS） was first grafted onto the surface of SBA-15 and then polyethylenimine （PEI） was impregnated into the space of pores. This novel adsorbent possessed a very high density of amine groups. The structural property, CO2 adsorption capacity and amine efficiency of mixed-amine functionalized SBA-15 with different ratios of APTS and PEI were investigated. The CO2 adsorption result showed that the performance of mixed-amine functionalized SBA-15 depended on kinetic diffusion. SBA- 15-（APTS-0.5-PEI-50）, SBA- 15-（APTS- 1.0-PEI-50） and SBA- 15-（APTS-2.0-PEI-30） could be identified as potential adsorbents at 75℃. The amine efficiency of mixed-amine functionalized SBA-15 was between purely impregnated and grafted ones.