在全球溫室效應日趨嚴重之時，碳捕獲及封存之技術已成為各國政府致力的目標。其中，化學迴圈燃燒程序不需耗費大量成本與能源就可以把二氧化碳分離、捕捉且利用之優點。載氧體於化學迴圈燃燒程序中為影響整個反應是否連續進行的關鍵所在。但由於載氧體的製備是非常耗時也耗成本的，因此本研究將致力於電弧爐收集之集塵灰作為載氧體運用於化學迴圈燃燒程序之反應性評估。
由於電弧爐收集之集塵灰之主要的結晶相為ZnO與ZnFe2O4。因此本實驗使用Fe2O3和ZnO於900℃下鍛燒製備出鋅鐵氧尖晶石結構載氧體。並且藉由熱重分析儀分析其反應特性。可以觀察到ZnFe2O4於還原氣氛下會先被分解成ZnO及Fe2O3，然後再分別被還原成金屬Zn與金屬Fe，有鋅蒸氣釋出的問題存在。故本實驗使用Al2O3與ZnFe2O4於高溫1100℃進行鍛燒，將會產生ZnAl2O4作為惰性擔體，並於750℃進行20圈還原-氧化反應，結果顯示，ZnAl2O4於750℃可以有效抑制鋅蒸氣釋出的問題，使其能維持良好之反應穩定性。將ZnFe2O4與Al2O3製備成ZnFe2O4/Al2O3錠材改以固定床反應器進行20圈之還原-氧化，亦具有相當優良之穩定性。
藉由ZnFe2O4之最佳製備參數及操作條件，將電弧爐收集之集塵灰搭配氧化鋁惰性擔體製備成EAFD/Al2O3錠材及EAFD/Al2O3粉末，分別應用以固定床反應器及流體化床反應器。其中，EAFD/Al2O3錠材於固定床反應器進行於750℃連續20圈之還原-氧化反應，結果顯示雖然EAFD/Al2O3錠材因透過燒結導致過於緻密，造成於前三圈之還原-氧化反應無法將CO完全轉化成CO¬2，但隨著圈數增加，比表面積增大，其CO2之產率可以一直維持在95%。EAFD/Al2O3粉末應用於流體化床時，以2%合成氣進行50圈之還原氧化反應，CO¬2產率可以維持在88%，具有相當優良之穩定性。故可以得知電弧爐收集之集塵灰搭配氧化鋁惰性擔體應用於化學迴圈燃燒程序是相當具有發展性的。

As the global warming issue worsens gradually, the Carbon Capture and Storage (CCS) techniques have been a goal to be committed for each government worldwide. Among the techniques of CCS, Chemical Looping Combustion (CLC) possess the advantage of not only low cost, but also less power consumption. Oxygen carrier plays a decisive role on the entire CLC process for the reaction to be continuous, but unfortunately, the preparation of Oxygen carrier is time consuming and costly. Therefore, the aim of this study is to assess the reaction using Electric Arc Furnace Dust (EAFD) as the Oxygen carrier of CLC process.
Since ZnO and ZnFe2O4 are the two main crystalline phase of EAFD, spinel structure ZnFe2O4 Oxygen carrier was formed under 900℃ calcination from Fe2O3 and ZnO in the experient. Thermogravimetric analyzer was utilized to perform quantitative and qualitative observation on characteristics of the reaction. ZnFe2O4 was seen firstly to be decomposed into ZnO and Fe2O3 under reducing atmosphere, and then both were reduced to metal Zn and Fe, respectively. This results an issue to the existence of zinc vapor due its low gasification temperature. Hence, Al2O3 and ZnFe2O4 were calcined under 1100℃ to form ZnAl2O4 as insert support, and 20 redox reaction cycles were applied under 750℃. As a result, ZnAl2O4 inhibited the issue of zinc vapor release in order to maintain favorable reaction condition. Moreover, applying ZnFe2O4/Al2O3 pellet into Fixed-Bed Reactor (FxBR), carrying out 20 redox cycles also show favorable features.
EAFD and Al2O3 were made into EAFD/Al2O3 pellet and EAFD/Al2O3 powder under optimized parameters and process, and then applied to FxBR and Fluidized Bed Reactor (FzBR), respectively. The result of EAFD/Al2O3 pellet being applied to FxBR shows that sintering have caused it too dense, which leads to difficulties for CO transforming into CO¬2 within first 3 redox cycles. Hence, as the number of redox cycles increase, the specific surface area (SSA) increases, and brings about maintaining CO2 yield for up to 95%. Whereas the result of EAFD/Al2O3 powder applied to FzBR carrying on 50 redox cycles with 2% syngas, shows that CO¬2 yield could maintain for up to 88%. As a result, EAFD and inert support possess great potential in the application of CLC process.

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