负载氨基的介孔SiO_2用于CO_2/N_2分离

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。

Amino-functionalized silica for CO2 and N2 separation

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.