负载氨基的介孔SiO_2用于CO_2/N_2分离  

Amino-functionalized silica for CO_2 and N_2 separation

作　　者：胡智辉[1] 宫秀坤[2] 张东辉[1] 

机构地区：[1]天津大学化工学院化学工程研究所,化学工程国家联合重点实验室,天津300072 [2]吉林油田公司井下作业工程公司,吉林松原138002

出　　处：《天然气化工—C1化学与化工》2009年第5期1-4,共4页Natural Gas Chemical Industry

基　　金：留学回国人员启动基金项目(413547-0301)

摘　　要：采用S-N+I-成型机理合成带氨基的介孔SiO2,利用异丁酸为结构导向剂(SDA),氨丙基三乙氧基硅烷(APTES)为助结构导向剂(CSDA),通过氨基和羧酸基的电荷作用来形成。对样品进行低温N2吸附脱附,傅里叶红外表征,用压力天平测量其CO2、N2吸附量。结果发现合成的材料有较高的CO2吸附能力,最佳吸附剂常温常压下CO2的吸附量为0.68mmol/g,CO2、N2分离系数为6.8,100℃下CO2可完全解吸,且经过多次吸附/解吸循环后基本保持CO2吸附特性不变。Amine-functionalized mesoporous silica for separation of CO2 and N2 was synthesized via the S^-N^＋I^- mechanism, with isobutyric acid as a structure-directing agent （SDA）, aminopropyltriethoxysilane （APTES） functions as a co-structure directing agent （CSDA）. The materials were characterized by nitrogen adsorption/desorption and FT-IR, and their adsorption capacities of CO2 and N2, were measured by Thermo Cahn. The results showed that the synthetic materials had high adsorptive capacity of CO2, which was 0.68mmol/g for the best material with a CO2/N2 separation coefficient of 6.8 at normal temperature and pressure, CO2 could desorb completely at 100℃, and the material was robust enough to maintain steady adsorption performance during the adsorption-desorption cycles.

关 键 词：介孔二氧化硅 胺官能化 氨丙基三乙氧基硅烷 二氧化碳/氮气 吸附分离 

分 类 号：O647.3[理学—物理化学]