| 研究生: |
林琪家 Lin, Chi-Chia |
|---|---|
| 論文名稱: |
氧化鈣/矽藻土複合物於二氧化碳吸附之研究 The study of CaO/diatomite composites in CO2 adsorption |
| 指導教授: |
陳燕華
Chen, Yen-Hua |
| 學位類別: |
碩士 Master |
| 系所名稱: |
理學院 - 地球科學系 Department of Earth Sciences |
| 論文出版年: | 2012 |
| 畢業學年度: | 100 |
| 語文別: | 中文 |
| 論文頁數: | 141 |
| 中文關鍵詞: | 氧化鈣 、矽藻土 、改質 、複合物 、二氧化碳 、吸附 |
| 外文關鍵詞: | Calcium oxide, diatomite, modification, composite, carbon dioxide, adsorption |
| 相關次數: | 點閱:84 下載:6 |
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由於氧化鈣擁有優異的CO2吸附量,成為具有潛力的CO2吸附材,然而在吸/脫附的重複再生過程中,氧化鈣會產生燒結的現象,並影響吸附作用的進行,為了增加循環利用次數,我們預期將氧化鈣與矽藻土予以複合以隔離氧化鈣顆粒間的燒結作用。矽藻土是一種多孔物質,擁有高比表面積、表面負電性、多孔洞結構等特性,並能藉由化學改質增加其孔隙度。本研究將矽藻土分別浸泡於氫氧化鈉、鹽酸與硫酸溶液中,藉由侵蝕矽藻土的表面與裂縫,提升矽藻土的比表面積與孔隙率,並利用掃描式電子顯微鏡、比表面積分析儀與X光繞射儀分析樣品形貌、孔洞以及晶體結構的變化。硫酸改質矽藻土在配置濃度1.0 M、活化時間24小時,溶液溫度75℃及攪拌500 rpm轉速可得到最佳改質效果。氧化鈣與改質矽藻土以100/0、95/5、75/25、55/45與35/65之莫爾比例做複合,並以熱重-熱差分析儀對複合物進行CO2吸附實驗,測量CO2吸附量以及多次循環利用性能,並藉由CO2吸附前後的特性分析以瞭解吸附機制。實驗結果顯示:CaO-100與CaO-95具有較佳的CO2吸附效率,且CaO-95擁有對CO2吸附時較佳的循環利用性(穩定性);然而由於矽藻土與氧化鈣之間的化學反應,促進矽酸鈣的產生並消耗複合物中氧化鈣的含量,使得其它複合物對CO2吸附量的穩定性下降。
The calcium oxide is a potential CO2 sorbent due to its great CO2 adsorption capacity. However, the surface area and porosity of CaO are eliminated by the sintering effect during the sorption/desorption process, then the adsorption capacity and the stability would be declined. To overcome these drawbacks, CaO is combined with the diatomite to cease the side-effect of sintering. Diatomite is a porous material with high specific surface area, surface electronegativity, and high porosity. Moreover, the surface area and porosity could be enhanced by chemical modification. In this study, diatomite is modified by NaOH, HCl, H2SO4 solutions to corrode the surface structure, and promote its specific surface area and porosity. Then the modified-diatomite is analyzed by using scanning electron microscope, surface area and porosity analyzer and X-ray diffractometer to observe the morphology, porosity, and crystalline structure, respectively. The best modified condition is that diatomite with H2SO4 modification having concentration of 1.0M, reaction time of 24hr, stirring at 500rpm at 75℃. And then CaO and modified-diatomite is combined with molar ratio of 100/0, 95/5, 75/25, 55/45 and 35/65. The CO2 adsorption capacity and efficiency is examined by the thermo-gravimetric analyzer. The CO2 adsorption mechanism via the property analysis before and after CO2 adsorption is also discussed. The results show that the samples of CaO-100 and CaO-95 have a better CO2 adsorption efficiency, and the sample of CaO-95 has the best CO2 adsorption stability. However, the chemical reaction between diatomite and CaO results in the formation of calcium silicate and decline the amount of CaO in the composite. This leads to the composite having a lower stability of CO2 adsorption/desorption processes.
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