混合胺改性SBA-15的二氧化碳吸附特性  

Mixed-amine functionalized SBA-15 for CO_2 adsorption

作　　者：靖宇[1] 韦力[1,2] 王运东[1] 于燕梅[1] 

机构地区：[1]清华大学化学工程系,化学工程联合国家重点实验室,北京100084 [2]北京化工大学化学工程学院,北京100029

出　　处：《化工学报》2014年第1期328-336,共9页CIESC Journal

基　　金：国家自然科学基金项目(20836008,21176132)~~

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CO2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、CO2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。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.

关 键 词：二氧化碳捕集 吸附 吸附剂 介孔材料 胺功能化材料 

分 类 号：TQ028.2[化学工程]