Carbon dioxide capture using amine-impregnated HMS having textural mesoporosity

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• 作者：Chao Chen ; Won-Jin Son ; Kwang-Seok You ; Ji-Whan Ahn ; Wha-Seung Ahn
• 关键词：HMS ; PEI impregnation ; Textural mesoporosity ; CO₂ sorption
• 刊名：Chemical Engineering Journal
• 出版年：2010
• 出版时间：1 July 2010
• 年：2010
• 卷：161
• 期：1-2
• 页码：46-52
• 全文大小：1032 K

文摘

A series of HMS (hexagonal mesoporous silica) materials having different textural mesoporosities was synthesized using dodecylamine as a structure directing agent, which were employed as a host for supporting PEI (polyethylenimine) (PEI/HMS) as a CO₂ capturing agent. The textural properties of the prepared materials were examined by XRD, N₂ adsorption–desorption isotherms, and SEM. CO₂ sorption/desorption measurements were carried out using a TGA unit using high purity (99.999 % ) CO₂. The as-prepared HMS alone exhibited a moderate sorption capacity of 34 mg_CO2/g_sorbent at 25 °C. The PEI/HMS prepared using a HMS having complementary textural mesopores exhibited CO₂ sorption capacity of 128 mg_CO2/g_sorbent with a 45 wt % PEI loading at 75 °C, whereas a sorption capacity of 94 mg_CO2/g_sorbent only was obtained under the same loading level using a HMS host with negligible textural mesoporosity. In addition, we were able to increase the PEI loading to 60 wt % without losing the capturing efficiency of the former, and achieved a CO₂ sorption capacity of 184 mg_CO2/g_sorbent, one of the highest capturing capacities reported in the literature thus far under the given conditions. PEI/HMS exhibited only a minor drop in CO₂ capture capacity during a 4 repeated cyclic sorption–desorption run at 75 °C.