Fabrication of CaO/Mesoporous Carbons Sorbents for CO2 Capture

• Main Authors: Shu-Hong Guo, 郭書宏
• Other Authors: Shou-Heng Liu
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/29490445575179443621

碩士 === 國立高雄應用科技大學 === 化學工程與材料工程系碩士在職專班 === 102 === In recent years, global warming has triggered enormous public concerns and severe environmental problems. The increases of CO2 concentration in the atmosphere due to the rapid development of industrial has been caused by the consumption of huge amounts of fossil fuels. In order to reduce CO2 emissions, many researchers focus on developments of CO2 capture and sequestration. A preliminary analysis from US indicated that an economically feasible approach for CO2 capture should further cost-down to less than US $30. Thus, it is urgent to develop low cost and cyclic stability of adsorbents for practical applications. The objectives of this research are to prepare nanostructured mesoporous carbon supported nanosized calcium oxide (CaO) materials as the CO2 adsorbents. A one- pot route is proposed by crosslinking phenolic resins with block-copolymer surfactant templates in the presence of different amounts of Ca precursors. After high temperature of carbonization, mesoporous carbon materials supported nanocrystalline calcium oxides (CaO-x/SMC) can be obtained. The structural and chemical properties of CaO-x/SMC by different spectroscopic and analytical techniques, such as powder X-ray diffraction (XRD), nitrogen adsorption/desorption isotherms (BET), fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS). The CO2 sorption/desorption performance was also investigated in terms of various adsorption and desorption temperatures by using thermogravimetric analyzer (TGA). To compare the stability and recyclability of commercially avaliable CaO and CaO-x/SMC, the cyclic adsorption-desoprtion tests were also studied. The experimental results show that CO2 adsorption-desorption performance was affected by the operation temperatures and calcium contents. In addition, mesoporous carbon support could effectively restrict the growth of calcium oxides and thus avoid sintering during the high-temperature cycling processes.