本研究之主要目的為篩選出適合用於化學迴圈產氫之合成鐵-鈦系複合載氧體。為了製備出具有高機械強度之複合載氧體，分別將合成的鐵鈦與氧化鋁、氧化鎂或二氧化鋯混合，並利用壓錠方式製備成錠材，不僅增強了機械強度且錠材的形狀也易於觀察反應前後的表面結構。本研究為了增加鐵鈦鋁複合載氧體之反應性，對於添加不同比例的澱粉含量做了探討，實驗結果顯示，隨著澱粉含量增加，鐵鈦鋁複合載氧體之轉化率也會逐漸上升。此外，為了要使鐵-鈦系複合載氧體的機械強度增加，不同的燒結溫度及不同的錠材密度也做了研究，當鐵鈦鋁及鐵鈦鎂複合載氧體之鍛燒溫度為1200oC，在反應前及經過10圈的氧化還原操作後，皆具有相當不錯的反應性及機械強度;此外，鐵鈦鋯複合載氧體鍛燒溫度為1200oC及經過10圈的氧化還原操作後，在錠材之表面明顯地發現裂縫，此結果會造成機械強度的下降，根據此實驗結果，鐵鈦鋯複合載氧體並不適合用於化學迴圈上。
本研究在固定床反應器之產氫條件中，對水蒸氣的流量及載氣做了探討，實驗結果顯示，當水蒸氣的流量為每分4mmol時，可以穩定的產氫30分鐘; 改變水蒸氣的載氣流量，對於產氫的速率並沒有太大的影響。在固定床反應系統中，在400到1000oC的操作溫度下亦藉由通入水蒸氣以氣化鐵-鈦系複合載氧體(鐵鈦、鐵鈦鋁、鐵鈦鎂及鐵鈦鋯)，同時使水蒸氣還原產氫，在30分鐘的產氫時間內，每50克鐵-鈦系複合載氧體在900oC的操作溫度下，皆能夠穩定的達到約64mmol的產氫量。

This study had focused on screening the suitable oxygen carriers for the applications of CLC and CLHG process, using synthetic ilmenite (Fe2O3/TiO2) oxygen carrier supported by Al2O3, MgO or ZrO2 based metal oxide. In order to increase the mechanical strength of Fe-Ti based oxygen carrier after multi-redox cycles. The synthetic ilmenite were prepared with Al2O3, MgO or TiO2 as inert support with mass ratio of 70/10/20 by mechanical mixing and pelletized by tablet machine, respectively. And the pellet was facilitated observation of the surface structure of calcined and after 10 redox cycle.
For increasing the reactivity of FAT721 pellet, the different starch content was added to pellet. It revealed that the conversion was increased with increasing starch content of FAT721 pellet. Besides, in order to increasing the mechanical strength of FAT721-S10, FMT721-S10 and FZT721-S10 pellet, the different sintering temperature and apparent density of pellet was investigated. The results showed that FAT721-S10 and FMT721-S10 sintered at 1200oC had proper mechanical strength and good reactivity of calcined and after 10 redox cycle. However, FZT721-S10 pellet sintered at 1200oC had low mechanical strength after 10 redox cycle. It revealed very clear cracks were found on the surface. As the results, FZT721-S10 was not a suitable condition for preparation of oxygen carriers.
It revealed that the experiment conducted at inlet flow rate of carrying gas from 50 to 500 ml/min were insignificantly effect on the amount of H2 production in fixed bed reactor. Furthermore, the inlet steam flow rate of 4 mmol/min was a suitable condition for hydrogen generation by CLHG process in this study.
Hydrogen generation was demonstrated to be feasible by steam oxidation with reduced FT73-S0, FAT721-S10, FAT7212-S10, FMT721-S10, FMT7212-S10 and FZT721-S10 oxygen carrier was by steam oxidation in varied temperature from 400-1000oC in the fixed bed reactor. Also, carriers of FAT7212-S10 and FMT7212-S10 had showed the high yield of hydrogen generation by steam oxidation with reduced oxygen carriers for experiments conducted at 900°C. As the above results, it could be summarized that FAT7212-S10 and FMT7212-S10 pellet has proper reactivity and has good H2 production at 900oC. Oxidization of FAT7212-S10 and FMT7212-S10 with steam in fixed bed reactor system at 900oC generated about 64 mmol/50g hydrogen gases every 30 min.

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