CO2 capture by amine modified kaolinite

• Main Authors: De-LongLu, 呂德隆
• Other Authors: Yen-Hua Chen
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/83351262718462539056

碩士 === 國立成功大學 === 地球科學系碩博士班 === 101 === The CO2 emission to the atmosphere has gradually increased, and this green house gas results in the global warming and climate change. Therefore it is more important to reduce the CO2 discharge. Kaolinite, a cheap and common material, is the caly mineral with a layered structure of Si-O tetrahedral sheets and Al-O octahedral sheets. In this study, the surface area and porosity of kaolinites are enhanced by acidic treatment. After preparation, the acid-treated kaolinites are modified with amine. These samples are then performed with CO2 adsorption/desorption experiments to evaluate the ability of CO2 capture. The best acidic treatment parameter is the concentration of 3 M H2SO4, reaction temperature of 95 ℃, reation time of 10 hr, which is tested by different H2SO4 concentrations and reaction time. The specific surface area is promoted from 18.9 to 74.3 m2/g after acidic treatment. Moreover, its CO2 adsorption efficiency is 3.3 mg/g. Then kaolinites are modified with NaOH and H2O2 to promote the amount of OH group on the surface. The effect on OH group modification with H2O2 is better than that with NaOH. After that, kaolinites are modified with MEA and EDA to enhance the efficiency of CO2 adsorption. Some parameters of amine modification are discussed: (1) OH group modified or not, (2) reaction temperature, (3) the ratio of amine/sample, (4) the ratio of solid/liquid. The amine modified kaolinites are then analyzed by using XRD, FTIR, BET measurements. The CO2 adsorption/desorption and multiple reaction cycles of samples is examined by the thermo-gravimetric analyzer. It is observed that the best amine modified parameter to adsorb CO2 is the kaolinite without modification with NaOH, at room temperature, the ratio of amine/sample=1/1, the ratio of solid/liquid=1/10. And its CO2 efficiency is 149 mg/g, which has a good durability (52 mg/g) of CO2 adsorption/desorption with 10 cycles. From this study, it suggests the amine modified kaolinite is the potential adsorbent to capture CO2.