Catalytic decomposition of sulfuric acid on mixed Cr/Fe oxide samples and its application in sulfur–iodine cycle for hydrogen production
Catalytic decomposition of sulfuric acid on mixed Cr/Fe oxide samples and its application in sulfur–iodine cycle for hydrogen production
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DOI：
10.1016/j.ijhydene.2007.07.017
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发表时间：
2008
影响因子：
7.2
通讯作者：
A. Banerjee;M. Pai;K. Bhattacharya;A. Tripathi;V. S. Kamble;S. Bharadwaj;S. K. Kulshreshtha
中科院分区：
文献类型：
--
作者：
A. Banerjee;M. Pai;K. Bhattacharya;A. Tripathi;V. S. Kamble;S. Bharadwaj;S. K. Kulshreshtha
本文研究了硫基热化学水分解循环（包括硫-碘热化学循环）中常见的硫酸催化分解反应。研究了Cr取代Fe氧化物催化剂在硫酸分解反应中的活性和稳定性。采用陶瓷法合成了Fe2(1-x) cr2xo3样品，并用XRD、N2-BET和IR光谱对样品进行了表征。通过记录多个TPR/TPO谱图来监测催化剂在重复还原-氧化循环中的稳定性。在400-800°C的温度范围内，用气相色谱法评价了硫酸分解反应的温度依赖性活性，反应的进料速度为1200ml -1h-1。利用红外光谱和质谱法对废水中的二氧化硫进行了鉴定。通过对Fe2(1-x) cr2xo3样品的XRD和IR分析发现，在SO3→so2转化过程中，氧化物表面形成了亚稳金属硫酸盐（M-SO4）。
The present paper deals with the catalytic decomposition of sulfuric acid reaction which is common to several sulfur based thermochemical water splitting cycles including the sulfur–iodine thermochemical cycle. The activity and stability of Cr substituted Fe oxide catalysts were studied for the sulfuric acid decomposition reaction. The samples Fe2(1-x)Cr2xO3were synthesized using ceramic route and characterized by XRD, N2-BET and IR spectroscopy. The stability of catalysts toward repeated reduction–oxidation cycle was monitored by recording multiple TPR/TPO profiles. The temperature dependent activity was evaluated using gas chromatography in temperature range of 400–800∘C for the sulfuric acid decomposition reaction having a feed rate of space velocity of 1200mlg-1h-1. The SO2in the effluent gases was identified by IR and mass spectrometry. The mechanism involves the formation of metastable metal sulfate (M–SO4) on the surface of oxides during SO3→SO2conversion as suggested by XRD and IR studies on used Fe2(1-x)Cr2xO3samples.