化學迴路燃燒程序為同時具有低成本及高能源效率之二氧化碳捕獲技術，其技術特點為於低成本下即可將二氧化碳進行分離及捕捉。其中，載氧體於化學迴路燃燒程序中扮演一個非常重要的角色，為傳遞熱與氧氣之樞紐，故選擇適合之載氧體將影響整個化學迴路燃燒程序是否順利連續操作之關鍵。氧化鐵為常見之載氧體，具有高熔點、低成本及高機械強度等優點，但多重氧化態問題將導致還原反應性降低，故本研究將評估海水中之鈉有效的摻雜改質氧化鐵，降低改質之成本，實現高效能之載氧體製備流程，並且改善氧化鐵運用於化學迴路燃燒程序中之二氧化碳莫爾分率、二氧化碳產率以及碳捕獲效率。
首先使用不同比例之氧化鐵/氧化鋁擔任基礎載氧體，評估不同比例之氧化鐵/氧化鋁載氧體運用於化學迴路燃燒程序之可行性，結果顯示，當氧化鐵/氧化鋁重量比為60：40時具有較佳之抗磨耗能力、反應活性以及反應穩定性，故本實驗將使用FA32當作基礎載氧體進行後續之不同含鈉水溶液摻雜改質氧化鐵/氧化鋁基礎載氧體之探討，評估鈉摻雜改FA32基礎載氧體運用於化學迴路燃燒程序中之可行性，其中含鈉水溶液來源分別為常壓電漿噴束(APPJ)製備氫氧化鈉水溶液與實驗級配置硝酸鈉水溶液。結果顯示，不同含鈉水溶液摻雜改質FA32基礎載氧體皆可以獲得良好之二氧化碳莫爾分率、二氧化碳產率及碳捕獲效率。
最後，本研究將使用氯化鈉模擬海水之成分配合常壓電漿噴束摻雜改質FA32基礎載氧體，評估海水摻雜改質FA32基礎載氧體運用於化學迴路燃燒程序之可行性，結果顯示氯化鈉摻雜改質FA32基礎載氧體於實驗級半套式流體化床反應器中具有較高之二氧化碳莫爾分率、二氧化碳產率及碳捕獲效率，其所對應之數值依序為0.95、0.91及0.96，具非常優秀之燃料轉化效果，因此對於後續海水摻雜改質FA32運用於化學迴路燃燒程序中將具優越之前瞻性。

Chemical looping combustion (CLC) process has been recognized as a promising technology of carbon dioxide (CO2) captured. This technology is involved of capture, separation and utilization CO2 gas without high cost and resources. However, oxygen carriers, which transferred heat and oxygen, play an important role in the CLC process and the performance is a key issue for the application of CLC process. The use of iron oxide (Fe2O3) as oxygen carrier in CLC process is attractive because of their relative high melting point, low cost and high mechanical property. Unfortunately, the low reactivity of Fe2O3 with fuel is the major drawbacks during reduction reaction. In this study, sodium (Na) dopants from sea water is an effective catalyst, and as such it was combined with Fe2O3 to assess any possible enhancement to the kinetic rate of the reduction of Fe2O3 with fuel gases.
In this study, the feasibility of different ratios of Fe2O3/Al2O3 as oxygen carriers in CLC process were investigated. The Fe2O3/Al2O3 oxygen carrier with 60wt% Fe2O3 shows successful attrition behavior, reaction activity and thermal stability in the CLC process. Furthermore, the effectiveness and sources of Na ions as a FA32 oxygen carrier promoter via wet impregnation method are also investigated. The reduction performance and thermal stability are determined by thermogravimetric analyser (TGA). Moreover, carbon dioxide yield of the Na-modified FA32 oxygen carrier is also performed in lab-scaled semi-fluidized bed reactor (semi-FzBR). It is found that the incorporation of 5 mol% Na led to an improved reduction performance as compared to the unmodified oxygen carrier. The addition of Na ions can significantly promote the reduction performance of FA32 oxygen carrier.
Moreover, the use of NaCl solution as a precursor to prepare the sodium dopants using a novel atmospheric pressure plasma jet (APPJ). The incorporation of sodium dopants from NaCl solution led to an improved reduction performance as compared to the raw FA32 oxygen carrier. The addition of Na ions from seawater can significantly promote the carbon capture efficiency and CO2 yield of FA32 oxygen carrier. Therefore, Na-modified Fe2O3/Al2O3 via seawater by APPJ system as oxygen carrier in a reversible chemical looping combustion process would be environmentally beneficial.

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