负载胺基氧化硅气凝胶的制备及其CO_2吸附性能研究（英文）

Synthesis and CO_2 Adsorption Performance of Amineloaded Silica Aerogel

为了提高氧化硅气凝胶对低分压CO_2的吸附性能,以正硅酸乙酯和氨丙基三乙氧基硅烷为先驱体,通过溶胶-凝胶过程制备了比表面积较大、表面胺基丰富的负载胺基氧化硅气凝胶。负载胺基氧化硅气凝胶对低分压CO_2的吸附量随着氮含量的增加而增大。在25℃时,对CO_2含量为0.5%(总压为100kPa)、相对湿度为60%的气体的CO_2吸附量可达1.85mmol/g。由于胺基通过化学键与氧化硅气凝胶骨架相连,同第2个循环相比,负载胺基氧化硅气凝胶第10个循环的吸附量没有出现下降,这说明负载胺基氧化硅气凝胶具有良好的长期使用性能。

To enhance the adsorption capacity of silica aerogel for low-pressure CO_2, amine-loaded silica aerogel with relatively high specific surface area and a great amount of surface amines was prepared by sol-gel process using tetraethoxysilane and 3-aminopropyltriethoxysilane as precursors. The adsorption capacity of amine-loaded silica aerogel for low-pressure CO_2 increases with increasing the nitrogen content. When CO_2 content is 0.5%(total pressure is 105 Pa) and relative humidity is 60%, the CO_2 adsorption capacity is 1.85 mmol/g at 25 oC. With amines chemically linked with the silica aerogel framework, the CO_2 adsorption capacity of the 10 th adsorption/desorption cycles does not decrease compared with that of the 2rd cycles, which reflects its perfect stability for long-term use.