氨基改性有序介孔氧化铝吸附二氧化碳性能研究  

Adsorption of CO_2 with amino-modified ordered mesoporous alumina

作　　者：柴彤 赵瑞红[1] 栗明宏[1] 李宣民 

机构地区：[1]河北科技大学化学与制药工程学院,河北石家庄050018

出　　处：《无机盐工业》2016年第12期14-18,共5页Inorganic Chemicals Industry

基　　金：国家自然科学基金(20676010);河北省科技厅计划项目(11457226)

摘　　要：采用硝酸铝为铝源,碳酸铵为沉淀剂,聚乙二醇(PEG1450)为模板剂,合成廉价的有序介孔氧化铝(OMA)作为吸附剂载体。以2-氨基-2-甲基-1-丙醇(AMP)为氨基化表面修饰剂,对OMA采用过量浸渍法进行表面氨基化,制备一种高性能低成本的二氧化碳吸附剂OMA-AMP。通过BET法比表面积测定、X射线衍射(XRD)、透射电镜(TEM)、红外光谱(IR)等表征方法对改性前后吸附剂的比表面积、孔结构等特性进行表征,结果表明制备的OMA-AMP具有比表面积大、孔径分布窄、孔结构有序等特点。利用模拟烟道气,从浸渍时间、吸附床层温度、气体流量以及AMP浓度4个变量考察吸附剂的性能。结果表明,OMA经过质量分数为50%的AMP浸渍12 h,在吸附温度为70℃、气体流量为40 m L/min条件下,OMA-AMP对二氧化碳的吸附量高达84.15 mg/g;吸附剂吸附性能较稳定,再生容易且效果良好;吸附剂制备成本低廉,吸附效率高。该吸附剂可以解决在二氧化碳捕集技术中成本居高不下的问题,在工业上具有实际应用价值。With Al （NO3）3 as the source of aluminum, （NH4）2CO3 as the precipitant,and polyethyleneglycol （PEG1450） as template, the inexpensive ordered mesoporous alumina （OMA） was synthesized, being about the adsorbent supporter.With 2- amino-2-methyl-l-propylalcohol （AMP） as the modification agent,a high performance and low cost CO2 adsorbent,OMA- AMP was prepared by over-load impregnation method.The specific surface and pore structure of synthesized sorbent were characterized by BET, XRD, TEM, and IR.Resuhs showed OMA-AMP had the features of high specific surface area, narrow pore size distribution, and organized pore structure.The OMA-AMP performance was investigated from the four aspects of impregnation time,adsorption bed temperature,gas velocity,and AMP concentration by simulated flue gas.Adsorption experiments results showed that under the conditions of mass fraction of AMP 50% ,impregnation time of 12 h, adsorption temperature of 70 ℃ and gas velocity of 40 mL/min, the OMA-AMP＇ s adsorption amount to CO： was as high as 84.15 mg/g, and the adsorption performance was stable and the regeneration effect was good as well.The preparation cost was low, and adsorbent efficiency was high.This adsorbent can solve the constant high cost problem in CO2 capture technology.Therefore, it has a real industrial application value.

关 键 词：有序介孔氧化铝 氨基改性 吸附 二氧化碳 

分 类 号：TQ174[化学工程—陶瓷工业]