Use of expander to synthesize mesoporous adsorbents of different pore structure and their application for the CO2 greenhouse gas capture

• Main Authors: Lin, Chong-wei, 林崇瑋
• Other Authors: Bai, Hsunling
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/39735606203354424096

碩士 === 國立交通大學 === 環境工程系所 === 99 === The structure of mesoporous support is found to play a vital role in the performance of CO2 adsorption capacity, but literature data still show no conclusion yet. The purpose of this study is to expand the pore diameter and the pore volume of the MCM-41 base material via the use of pore expander. Then, the effect of different pore structures on the CO2 adsorption capacity and amine grafting will be discussed. In this study, the mesoporous material of MCM-41 is used as the substrate, and by adding the expansion agent of TMB (1,3,5-Trimethylbenzene) and changing the preparation parameters the pore diameter and the pore structure can be adjusted. The amount of TMB and the hydrothermal synthesis time on the pore structure are evaluated. Then several pore-expanded mesoporous materials with different pore structures are synthesized and functionalized with TEPA in order to evaluate the CO2 adsorption performance of these materials. The result shows that successful expansion on the pore diameters and volumes of MCM-41 is achieved, with the pore diameter increases from 3 nm up to 14 nm, and the pore volume increases from 0.99 cm3/ g up to 2.3 cm3/ g. In the meanwhile the high surface area of around 800 m2/ g can still be maintained. Furthermore, the correlation between CO2 adsorption capacity and the pore structure properties (pore size, pore volume and specific surface area) is studied. The result of the linear regression indicates that the CO2 adsorption capacity has the strongest correlation with the total pore volume of the mesoporous materials (R2>0.9). And the optimal TEPA grafted amount on the pore-expanded MCM-41adsorbent is 50 % (wt.). It exhibits a 125 mg/g adsorption capacity, which is superior to that of the original MCM-41, 97 mg/g.