Department of Chemical and Materials Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung, Taiwan.
J Air Waste Manag Assoc. 2011 Feb;61(2):226-33. doi: 10.3155/1047-3289.61.2.226.
Three ordered mesoporous silicas (OMSs) with different pore sizes and pore architectures were prepared and modified with amine functional groups by a postgrafting method. The carbon dioxide (CO2) adsorption on these amine-modified OMSs was measured by using microbalances at 348 K, and their adsorption capacities were found to be 0.2-1.4 mmol g(-1) under ambient pressure using dry 15% CO2. It was found experimentally that the CO2 adsorption capacity and adsorption rate were attributed to the density of amine groups and pore volume, respectively. A simple method is described for the production of densely anchored amine groups on a solid adsorbent invoking direct incorporation of tetraethylenepentamine onto the as-synthesized OMSs. Unlike conventional amine-modified OMSs, which typically show CO2 adsorption capacity less than 2 mmol g(-1), such organic template occluded amine-OMS composites possessed remarkably high CO2 uptake of approximately 4.6 mmol g(-1) at 348 K and 1 atm for a dry 15% CO2/nitrogen feed mixture. The enhancement of 8% in CO2 adsorption capacity was also observed in the presence of 10.6% water vapor. Durability tests done by cyclic adsorption-desorption revealed that these adsorbents also possess excellent stability.
三种具有不同孔径和孔结构的有序介孔硅（OMS）通过后嫁接法用胺官能团进行了修饰。通过微天平在 348 K 下测量了这些胺修饰的 OMS 对二氧化碳（CO2）的吸附，发现它们在环境压力下使用干燥的 15%CO2 的吸附容量为 0.2-1.4 mmol g(-1)。实验发现，CO2 的吸附容量和吸附速率分别归因于胺基团的密度和孔体积。描述了一种在固体吸附剂上生产密集固定胺基团的简单方法，该方法调用将四乙烯五胺直接掺入合成的 OMS 中。与通常的 CO2 吸附容量小于 2 mmol g(-1)的胺修饰 OMS 不同，这种有机模板封闭的胺-OMS 复合材料在 348 K 和 1 个大气压下对干燥的 15%CO2/氮气进料混合物具有显著高的 CO2 吸收能力，约为 4.6 mmol g(-1)。在存在 10.6%水蒸气的情况下，CO2 吸附容量也提高了 8%。通过循环吸附-解吸进行的耐久性测试表明，这些吸附剂还具有优异的稳定性。
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