Utilizing dual-template surfactant to synthesize mesoporous silica for enhancing CO2 capture

Autor: Huang, Yi-wen, 黃意雯
Rok vydání: 2014
Druh dokumentu: 學位論文 ; thesis
Popis: 103
SBA-15 possesses unique micro/mesoporous structure, thicker wall and higher hydrothermal stability. It has been reported in previous studies that pore structure plays a crucial role in the adsorbent performance. This work intends to utilize dual-surfactants for synthesizing SBA-15 materials with optimized structures in order to enhancing CO2 capture. The studying surfactants include P123, F68, F127, PEG200, PEG600 and CTAB. The pore structures such as surface area、pore size and pore volume of materials could be adjusted via different dual-surfactants combinations and ratios. These materials are applied on CO2 adsorption and the impact of structural changes are investigated. The results show that SBA-15 prepared with the dual templates of P123 and F68 exhibited better adsorption capacities. Especially for the one prepared with P123:F68=1:3, the adsorption capacity is 41 mg/g, which is superior to synthesized with single surfactant of P123(30 mg/g). In the combination of P123 and F68, the microporous structures increases as the amount of F68 increases. From the correlation of pore structures and CO2 adsorption capacity, the microporous surface area and micropore volume are the key factors for CO2 adsorption. The microporous structures can enhance adsorption capacity. Furthermore, the materials are modified via alkaline solution to increase CO2 adsorption capacity. According to the result, the materials modified by 0.1 M NaHCO3 can enhance the CO2 adsorption capacity (45 mg/g) but pore structure is effected by NaHCO3. The results on the temperature effect show that CO2 adsorption is decreased when temperature is increased. For the CO2/CH4 separation test, the selectivity of CO2 is slight declined when the CO2/CH4 ratio is decreased.
Databáze: Networked Digital Library of Theses & Dissertations
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