Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/5825
標題: 利用床質添加劑增進生質物氣化產氫之研究
Enhancement of hydrogen production by using bed-additives during biomass gasification process
作者: 林呈彥
Lin, Chen-Yen
關鍵字: 氣化;gasification;產氫;生質物;觸媒;床質添加劑;hydrogen production;biomass;catalyst;bed-additives
出版社: 環境工程學系所
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摘要: 
由於近年來石化燃料及其它的天然資源大量地被消耗,使得生質能源成為全球所研究之對象,其中氫氣因熱值高、反應後產物僅有水,故成為目前研究替代能源之重點。
本研究利用流體化床反應器探討床質添加劑在生質物氣化產氫過程所扮演之角色。於生質物氣化產氫實驗前,先以含浸法製備1 wt.%、5 wt.%、10 wt.%之Ni/Al2O3及1 wt.%、5 wt.%、10 wt.%之Fe/Al2O3。
於SEM結果可得知當鎳金屬披覆量從1 wt.%增至5 wt.%時,逐漸形成完整的氧化鎳晶相,且有較佳之金屬分散性。而鐵金屬披覆量1 wt.%時,觸媒表面生成具分散性佳之FeO晶相,因此有較佳之產氫能力。
於流體化床添加不同床質添加劑對產氫率之影響,結果顯示床質添加劑於流體化床進行生質物氣化產氫有助於提升其氫氣選擇率,其中Fe/Al2O3 + CaO之混合床質添加劑之氫氣提升率為56 %,而使用Ni/Al2O3 + CaO混合床質添加劑及Ni/Al2O3 + Fe/Al2O3 + CaO混合床質添加劑分別有30.6 %及29.5 %的氫氣提升率。綜合本研究結果,證明本研究所使用之床質添加劑於生質物氣化過程能有效降低二氧化碳排放、提升氫氣產率及促進碳轉換等功能。

Recently, with the crisis of fossil-fuels shortage and climate change, much work is currently under way to exploit renewable energy. Among various renewable energies, hydrogen energy attracts huge attention due to its major advantages in system efficiency and environmental friendliness.
In order to investigate the role of bed-additives for hydrogen production during biomass gasification, the effect on hydrogen production ability of different bed-additive mixtures were studied. Before biomass gasification in fluidized bed reactor, different metal loading amounts of alumina oxide (Al2O3) catalysts were synthesized by impregnation method. XRD results indicated that increasing the Ni loading ratio exhibited strong diffraction peaks corresponding to NiO due to the growth of crystallites. However, iron oxide species would significantly affect the hydrogen production ability. When the Fe content increased to 1 wt. %, the main reactive sites, FeO, spread over almost entire Al2O3 support. Therefore, 1 wt. % Fe/Al2O3 catalyst had good performance of hydrogen production.
The efficiencies of biomass gasification at 660℃ with different bed-additives were evaluated. The results indicated that all these bed-additives have contributed to enhance the hydrogen selectivity. The hydrogen promotion ratios of Fe/Al2O3 + CaO, Ni/Al2O3 + CaO and Ni/Al2O3 + Fe/Al2O3 + CaO bed-additive mixtures were promoted to 56%, 30.6%, and 29.5%, respectively. Consequently, the bed-additives played important roles in reducing CO2 emission, enhancement of hydrogen production, and promotion of carbon transformation.
URI: http://hdl.handle.net/11455/5825
其他識別: U0005-1108201319404100
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