研究生: |
徐維懋 Wei-mau Hsu |
---|---|
論文名稱: |
鎳鐵氧化物尖晶石結構載氧體之材料特性與惰性擔體之選用應用於化學迴圈性能評估 Materials Characteristics of Spinel Nickel Ferrite Oxygen Carrier and It’s Selection of Inert Supports for Chemical Looping Combustion Process |
指導教授: |
郭俞麟
Yu-lin Kuo |
口試委員: |
顧洋
Young Ku 曾堯宣 Yao-hsuan Tseng |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 機械工程系 Department of Mechanical Engineering |
論文出版年: | 2012 |
畢業學年度: | 100 |
語文別: | 中文 |
論文頁數: | 102 |
中文關鍵詞: | 化學迴圈燃燒程序 、鎳鐵氧化物 、尖晶石結構 、載氧體 、水分解產氫 |
外文關鍵詞: | Chemical Looping Combustion Process, Nickel Ferrite, Spinel Structure, Water-splitting for H2 Production, Oxygen Carriers |
相關次數: | 點閱:252 下載:3 |
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化學迴圈燃燒程序是一項具有低成本、高能源效率優點之二氧化捕獲與封存技術。對於化學迴圈燃燒程序而言,金屬載氧體的性能一直是能否實際運行的關鍵所在。一般常見之金屬載氧體在與擔體之搭配後容易發生交互反應而產生出不具活性反應之附產物,因而大幅降低化學迴圈程序之執行效能。在本實驗之初期研究發現,鎳鐵氧化物尖晶石結構具有結合氧化鐵之高氧化活性及氧化鎳之高還原速率之優點,且鎳鐵氧化物尖晶石結構載氧體在經過五圈的化學迴圈程序後仍具有優秀之反應活性,由此可說明此鎳鐵氧尖晶石載氧體有著適合進行化學迴圈程序的潛力。然而經過10 圈化學迴圈程序後表面結構有明顯之顆粒聚集現象。是以提出此實驗欲找尋適當惰性擔體混摻入載氧體之中以提高其化學迴圈程序之反應活性。
因此本研究使用固態反應法製備之鎳鐵氧化物尖晶石結構載氧體搭配三氧化二鋁、二氧化鋯、氧化釔安定氧化鋯作為擔體,探討不同載氧體/擔體之材料特性,並以熱重分析儀模擬載氧體/擔體系統之還原及氧化活性,再以SEM 及XRD 研究載氧體在執行還原氧化程序前後表面結構及組成結構之變化,以其了解鎳鐵氧化物搭配各種擔體之系統於化學迴圈程序中之還原及氧化活性並推導反應機制。並使用固定化床反應器搭配氣相層析儀分析載氧體之反應能力及水分解產氫之效能,以評估此鎳鐵氧化物載氧體系統未來於化學迴圈燃燒程序商業化之可行性。
三氧化二鋁具有耐高溫、價格低廉及產量豐富之特性,實驗使用三氧化二鋁做為惰性擔體應用於化學迴圈燃燒程序中,有效提升鎳鐵氧化物尖晶石結構載氧體還原氧化之執行圈數,可使鎳鐵氧化物尖晶石結構載氧體執行達50圈之化學迴圈燃燒程序。二氧化鋯具有高熔點、高沸點之化學性質,實驗使用二氧化鋯當作惰性擔體應用於化學迴圈燃燒程序中,二氧化鋯惰性擔體不與鎳鐵氧化物尖晶石結構載氧體發生交互反應,並且可有效降低載氧體之活化能能障,使得反應能夠更快速的進行,是極為安定之惰性擔體而可應用於化學迴圈燃燒程序中。氧化釔安定氧化鋯一般常用於固態氧化物燃料電池中當作固態電解質使用,其具有高熱及高化學穩定性之優點,而可使用於化學迴圈燃燒程序之中,並且固態電解質之氧離子傳導能力使得氧化釔安定氧化鋯系統在氧化段之程序具有更為優秀之反應能力。因此在考慮商業化大量應用之情況下,三氧化二鋁做為惰性擔體應用於化學迴圈燃燒程序中,相較於使用二氧化鋯惰性擔體及使用氧化釔安定氧化鋯惰性擔體之載氧體而言,具有更適合被實際應用之可行性。
Chemical looping combustion (CLC) process is a promising technology of CO2 capture and sequestration (CCS) with high energy efficiency and low emission of greenhouse gases. For the practical use, the performance of oxygen carriers is a key issue for the application on CLC process. Unfortunately, the formation of inactive compounds by the interaction between the ordinary metal oxygen carriers and inner supported were evidently encountered in a CLC process, which subsequently reduced the performance of CLC process. In our preliminary results, after 5 successive cycles, NiFe2O4 powder with a single phase of spinel structure represented a higher redox cycling behavior and stability as compared to the standard of NiO and Fe2O3. To identify the initial reduction mechanism of NiFe2O4, we obtained the activation energy (Ea) of the reduction behavior using the reduction rate equation and Arrhenius equation. However, at long redox cycles (10 cycles), the performance of NiFe2O4 oxygen carriers was dramatically reduced due to the agglomeration of oxygen carriers. Thus, the addition of inner materials as the supports to oxygen carriers is a necessary process to prepare a superior oxygen carrier system in the operation of long redox cycles in CLC process.
This study is to investigate the effects various inner supports (Al2O3, ZrO2 and YSZ) of in NiFe2O4 oxygen carrier system and the performance of CLC process by TGA system. Mingled various inner supports shift the reduction kinetics of oxygen carriers, NiFe2O4/Al2O3 system decayed the reduction kinetics but both NiFe2O4/ZrO2 and NiFe2O4/YSZ system promoted the reduction kinetics. To identify the initial reduction mechanism and activation energy, NiFe2O4/Al2O3 system’s activation energy is 83.4 kJ/mol reduction mechanism controlled by solid-state diffusion. For the systems of NiFe2O4/ZrO2 and NiFe2O4/YSZ, both reduction mechanisms are mainly dominated by gas diffusion with the activation energy values of 9.0 kJ/mol and 10.1 kJ/mol, respectively. Our results also demonstrated the higher redox cycling behavior of using the proposed preparation of NiFe2O4 as an oxygen carrier with Al2O3 support in a reversible chemical looping process (CLP).
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