铁基载氧体在化学链制氢中的应用研究

摘要

Fe2 O3/LaNiO3 and CeO2-Fe2 O3/LaNiO3 were prepared by citric acid complexation method and immersion method,and was used as the oxygen carrier in chemical looping hydrogen generation. The experiment was conducted under the conditions:ratio of Fe2 O3 to CH4 of 2∶1,water 0.1 mL,and atmospheric pressure to investigate the effect of reaction temperature. The results show that H2 output increases first and then decreases with increasing Fe loading. The optimum loading of Fe is 15%;Addi-tion of CeO2 improves the stability of the oxygen carrier. Under the condition of atmospheric pressure, ratio of Fe2 O3 to CH4 of 2,0.1 mL of water,reduction and oxidation reaction temperature of 800 ℃, the 5%CeO2-15%Fe2 O3/LaNiO3 oxygen carrier can be repeatedly used for 100 times with high activity.%采用柠檬酸络合法制备载体 LaNiO3，浸渍法制备铁基载氧体 CeO2-Fe2 O3/LaNiO3，并将其用于化学链制氢过程中。在剂烷比2∶1、进水量0.1 mL、常压的实验条件下，考察反应温度对载氧体反应性能的影响。结果表明：氢气产量随 Fe 负载量的增加先增大后减小，最佳负载量为15％；助剂 CeO2的添加，提高了载氧体的性能。5％CeO2-15％Fe2 O3/LaNiO3载氧体在固定床反应器、还原温度为800℃、氧化温度为800℃、剂烷比为2∶1、进水量为0.1 mL 的实验条件下连续循环100次后仍保持高活性。