改性硅胶吸附剂用于CO_2/CH_4吸附分离的研究  

Study on modified silica gels and their adsorption properties for CO_2/CH_4 mixed gas separation

作　　者：王洪梅[1] 罗仕忠[1] 吴永永[1] 孙思[1] 李通[1] 

机构地区：[1]四川大学化学工程学院,成都610065

出　　处：《天然气化工—C1化学与化工》2012年第5期1-5,26,共6页Natural Gas Chemical Industry

基　　金：国家科技支撑计划(S20110721507093)资助

摘　　要：采用等体积浸渍法,通过在硅胶材料(XFGJ)表面修饰不同碱金属或碱土金属离子,制备硅胶基型吸附剂。采用变压吸附考察改性硅胶对CO2/CH4混合气体的吸附及分离性能。实验发现,担载1%质量分数BaCl2的XFGJ(1Ba-XFGJ)对CO2/CH4混合气体的动态吸附分离效果最佳,在0.5MPa,20℃时,1Ba-XFGJ的分离因子为9.55,与未改性的XFGJ相比分离因子提高了116%。采用低温氮气吸附脱附表征XFGJ及1Ba-XFGJ的比表面积和孔径分布,发现BaCl2的引入能够增加微孔数量,有利于提高CO2/CH4的吸附分离性能。A series of alkali or alkaline-earth metal ions modified silica gel （XFGJ） adsorbents were prepared by incipient impregnation method, and their adsorption and separation behaviors for CO2/CH4 mixed gas were investigated by the pressure swing adsorption （PSA） process. The results showed that the 1Ba-XFGJ adsorbent with 1% BaCl2 （in mass fraction） had the best CO4CH4 separation performance, and its separation factor was 9.55 at 0.5MPa and 20℃, which was 116% higher than that of the unmodified XFGJ. The surface area and pore size distribution of 1Ba-XFGJ and XFGJ were determined by low temperature N._ adsorption- desorption （BET）. The results showed that the loading of BaCl2 increased the amount of mieropore of the adsorbent, which resulted in a better adsorption capability of CO2 and separation performance for CO3/CH4.

关 键 词：改性硅胶 吸附剂 变压吸附 PSA 二氧化碳 甲烷 沼气 垃圾填埋气 分离因子 吸附量 

分 类 号：O647.3[理学—物理化学] TQ028[理学—化学]