DEVELOPMENT OF FLY ASH-BASED SORBENT TO CAPTURE CO2 FROM FLUE GAS
In the present work the thermogravimetric characterization of the sorption of carbon dioxide on polymer-modified mesoporous materials (MCM-41) from fly ashes is described. In order to obtain MCM-41 materials from three different types fly ashes,(including CFB fly ash) hydrothermal processes using the supernatants of coal fly ashes and surfactants as the structure-directing agents, have been carried out. The obtained mesoporous materials were subjected to polyethylenimine (PEI) modification by their impregnation to obtain samples with PEI contents of 30, 50 and 70％, respectively. CO2 sorption/desorption tests on loaded PEI samples were carried out in a flow of a mixture of gasses (CO2-10％, O2-10％, N2-80％) at different temperatures: 25 and 75℃. The highest CO2 sorption value was obtained for the sample that contained the best-quality MCM-41 and was impregnated with PEI in the amount of 50％. This sample at a temperature of 75℃ can take CO2 in an amount equivalent to 111.7 mgCO2/g sample weight. Under the same conditions, but without PEI impregnation, this sample can take CO2 in an amount equivalent to 3.2 mgCO2/g sample weight, thus 35 times less. The research of CO2 adsorption on polymer-modified mesoporous materials from fly ashes carried out within this work has shown that these materials are characterized by high CO2 adsorption capacity under conditions typical of coal combustion boiler flue gas and have the chance of becoming an efficient adsorbent for application to post-combustion CO2 separation. For PEI impregnated samples, a different behaviour of adsorption/desorption profiles has also been observed (both sorption and desorption progresses very rapidly).
CO2 mesoporous materials MCM-41 CFB fly ash
I.Majchrzak-Kuceba W.Nowak
Czestochowa University of Technology, Department of Heating, Ventilation and Air Protection, Poland
国际会议
第20届国际流化床燃烧会议(20th International Conference on Fluidized Bed Combustion)
西安
英文
596-602
2009-05-18（万方平台首次上网日期，不代表论文的发表时间）