吸附剂特性对CO2/CH4吸附分离的影响分析

用于CO2/CH4二元混合体系吸附分离的吸附剂种类较多，效果参差不齐，而吸附剂的各种特性是影响分离效果的主要原因。本文从吸附剂特性出发，总结了孔结构、可交换阳离子、表面化学以及吸附剂湿度4个因素对吸附分离效果的影响，并解释了造成各种影响的原因。得出结论：中孔有利于该二元体系的分离和胺基嫁接；在吸附剂骨架之外引入合适的可交换阳离子可促进吸附剂与CO2四极矩之间吸引力，提升分离效果；吸附剂的表面羟基也是影响胺基嫁接的重要因素；水分既有利于该体系的吸附分离，又可以促进胺基吸附剂再生。

Impact of the characteristics of adsorbents on the adsorption and separation of CO2/CH4 binary system

There are many types of adsorbents which are used for adsorption and separation of CO2/CH4 binary mixtures system.It is the various characteristics of adsorbents that affect separation result.As a starting point,four kinds of adsorbent properties affecting separation,which include porous structure,exchangeable cations,surface chemistry and moisture of adsorbent,are summarized in this article and the reason of all kinds of influences are explained.We come to several conclusions,including that mesoporous is conducive to the separation and amine grafting;the introduction of corresponding exchangeable cations can enhance the affinity between quadrupole and adsorbents,and improve the adsorption selectivity;surface hydroxyl is also an important factor affecting grafting amine;moisture can enhance the separation performance of adsorbent but also is conducive to grafting amine.