【摘要】 碘硫循环是目前提出的效率最高、最有希望实现工业应用的热化学分解水制氢流程。碘硫循环由Bunsen反应、氢碘酸分解反应和硫酸分解反应组成。其中,硫酸分解是碘硫循环及其他含硫热化学循环中的共同步骤,需要在高温及催化剂存在下进行。本文以铁酸铜作为硫酸分解的催化剂,考察了反应温度、硫酸进料速率以及催化剂用量等因素对硫酸分解转化效率的影响,并与Pt催化剂的效果进行了比较。在铁酸铜催化的条件下,转化率比没有催化剂时平均提高了22%。温度超过820℃,催化效果与负载质量分数1%的Pt/Al₂O₃相当;催化剂活性在9 h内未出现下降趋势。用X射线衍射、比表面积全分析吸附、透射电镜以及热重-差热等方法对使用前后的铁酸铜进行了表征,给出了物相参数、表面性能参数及热稳定性等数据。更多还原

【Abstract】 Iodine-sulfur（IS） cycle,with its high efficiency,is the most promising thermochemical water splitting process for industrial application.IS cycle includes three reactions,i.e.,Bunsen reaction,HI decomposition and sulfuric acid decomposition.Copper ferrite was screened out as the catalyst for sulfuric acid decomposition,and influences of reaction temperature,feed rate of sulfuric acid and dosage of the catalyst on sulfuric acid conversion were investigated.The results showed that sulfuric acid conversion in the presence of copper ferrite was 22% higher than that in the absence of catalyst,and was comparable to that of 1%Pt/Al₂O₃ at over 820 ℃.No decline in activity of the catalyst was observed in the earlier 9 hours.The catalyst samples before and after use were characterized by XRD,BET,TEM and TG-DTA.更多还原