隨著世界人口的增加與科技的需求，加速了石油、天然氣等能源的消耗，如何利用醞藏最豐富的煤炭能源，將是未來能源發展的重要環節。由於其中煤炭氣化複循環發電技術(IGCC)無論在技術成熟性、能源效率及環保性能都是最卓越，因此將會是未來的發電主流之ㄧ。現在商業運轉之大型煤炭氣化複循環發電機組(IGCC)皆使用溼式商業化之除硫程序。然而溼式除硫必須用水來冷卻煤氣，使系統熱效率降低，為提高熱效率以降低發電及環保成本，世界各國皆在研發尋找高溫下乾式除硫方法。

　　本研究以重金屬廢水產生之鐵氧磁體作為高溫脫硫的吸收劑，可以兼具資源回收再利用及淨潔材料的目的，研究成果分為以下幾點探討：

1.鐵氧磁體吸收劑於多次脫硫－再生後利用率將有隨著次數增加而減少的趨勢，推測利用率降低與BET表面積減少和硫份的累積所造成。
2.以不同操作參數來觀察鐵氧磁體吸收劑利用率改變的情形，發現一氧化碳濃度增加，氫氣濃度減少會使利用率提高，此現象與water-shift reaction 有關。
3.氧化/還原氣氛之熱重分析，我們觀察了鐵氧磁體吸收劑於脫硫時的還原氣氛下與再生時的氧化氣氛下的重量變化。還原氣氛下，鐵氧磁體高溫下會被還原為低氧化數的氧化鐵，甚至元素鐵；氧化氣氛，發現有部分之脫硫後鐵氧磁體會先轉為FeSO4，之後才繼續氧化成為鐵氧磁體。
4.經由進行XPS的不同深度分析，我們發現脫硫後之鐵氧磁體外部與內部有明顯的不同，外部較趨向於氧化態，有硫酸跟及亞硫酸跟的鍵結存在；內部則趨向還原態。
5.由動力模擬研究發現，第一型衰退模式及第二型衰退模式皆能模擬脫硫反應。

　The residents’ environmental consciousness is rising more and more by time. In order to meet this demand, how to use the most abundant energy of coal as well as improving the efficiency of energy production technologies is being carried out. IGCC(Integrated Gasification Combined Cycle) is one of the ideal method to solve environmental and economic problem by using fossil fuels, especially coal. Hot gas desulfurization is crucial issue in the development of the IGCC system. Nowadays, all commercial IGCC power plants utilize wet desulfurization processes to remove H2S from hot coal gas. However, coal gas was cooled by the wet processes would be decrease the thermal efficiency of the system significantly. Therefore, high temperature removal of H2S techniques is the targets for the researchers in this field.

　Desulfurization of hot coal gas using the sludge from Ferrite Process sorbent in a fixed bed reactor was conducted in this study. It can be one kind of clean and recycle materials. The explanation of results can be divided into five major parts.

1.After multi-cycle desulfurization ferrite sorbent’s utilization was decayed as time rising. It may be concerned with decrease of BET surface area and accumulate of sulfur.
2.The effects of operating factors, such as CO inlet concentration, H2 inlet concentration and temperature on the removal of H2S were performed. The results show that the sorbent utilization increases with the CO concentration and decrease with the H2 concentration. This can be explained through the water-shift reaction.
3.Thermogravimmetry analysis under oxidation/reduction condition. Under reduction condition, ferrite sorbent will be reducted to low-activity iron oxide even elemental iron. Under oxidation condition, some part of sulfurated ferrite sorbent will be oxidized to FeSO4. It will be continuing oxidized to ferrite sorbent.
4.In the XPS analysis for surface and deeper depth, we can find there was obvious difference for sulfurated ferrite sorbent. Surface structure tends to oxidation state and deeper structure tends to reduction state.
5.In the operating range of this study, we can find that the both deactivation model type I and deactivation model II can simulate the desulfurization reaction.

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