Department of Environmental Engineering, National Chung Hsing University, Taichung, Taiwan, Republic of China.
J Air Waste Manag Assoc. 2010 Apr;60(4):489-96. doi: 10.3155/1047-3289.60.4.489.
A relatively new mesoporous silica sorbent for environmental protection applications (i.e., mesoporous spherical-silica particles [MSPs]), was modified by N-[3-(trimethoxysilyl)propyl]ethylenediamine (EDA) solution and was tested for its potential in the separation of carbon dioxide (CO2) from flue gas. The CO2 adsorption capacity of MSP and MSP (EDA) increased with temperature from 20 to 60 degrees C but decreased with temperature from 60 to 100 degrees C. The mechanism of CO2 adsorption on both samples is mainly attributed to physical interaction regardless of temperature change. The MSP (EDA) have good adsorption performance as compared with EDA-modified zeolite or granular activated carbon conducted in this study and many types of silica sorbents reported in the literature. The cyclic CO2 adsorption showed that spent MSP (EDA) could be effectively regenerated at 120 degrees C for 25 min and CO2 adsorption capacity of MSP (EDA) was preserved during 16 cycles of adsorption and thermal regeneration. These results suggests that MSP (EDA) are efficient CO2 sorbents and can be stably used in the prolonged cyclic operation.
一种用于环境保护应用的新型中孔硅基吸附剂（即中孔球形硅颗粒 [MSP]），通过 N-[3-(三甲氧基硅基)丙基]乙二胺（EDA）溶液进行改性，并对其从烟道气中分离二氧化碳（CO2）的潜力进行了测试。MSP 和 MSP（EDA）的 CO2吸附容量随温度从 20 升至 60°C 而增加，但随温度从 60°C 升至 100°C 而降低。无论温度变化如何，两种样品上 CO2 吸附的机制主要归因于物理相互作用。与本研究中进行的 EDA 改性沸石或颗粒活性炭以及文献中报道的许多类型的硅胶吸附剂相比，MSP（EDA）具有良好的吸附性能。循环 CO2 吸附表明，用过的 MSP（EDA）可在 120°C 下有效再生 25 分钟，并且在 16 次吸附和热再生循环中保留了 MSP（EDA）的 CO2 吸附能力。这些结果表明，MSP（EDA）是高效的 CO2 吸附剂，可在长时间的循环操作中稳定使用。
