Selective oxidation of H2S over V2O5 supported on CeO2-intercalated Laponite clay catalysts
Selective oxidation of H2S over V2O5 supported on CeO2-intercalated Laponite clay catalysts
复制标题
CeO2 插层锂皂石粘土催化剂上 V2O5 选择性氧化 H2S
DOI：
10.1039/c3cy00431g
复制
发表时间：
2013-01-01
影响因子：
5
通讯作者：
Hao, Zhengping
中科院分区：
文献类型：
--
作者：
Zhang, Xin;Dou, Guangyu;Hao, Zhengping
制备了一系列具有介孔结构和高比表面积的CeO2插层粘土催化剂(V2O5/Ce-Lap催化剂)。对其结构特征和物化性质进行了详细研究。对这些催化剂进行了H_2S选择氧化性能的评价。结果表明，所有V2O5/Ce-Lap催化剂在120-220℃温度范围内由于高度分散的V5+物种的氧化还原反应而表现出较高的催化活性，其催化机理服从氧化还原过程，即分步机理。此外，化学吸附的氧在H_2S选择氧化过程中也起着重要作用。其中，5%V2O5/Ce-Lap催化剂在180℃下具有最好的催化活性和良好的再生性能。最后，对催化剂失活机理进行了探讨。
A series of V2O5 supported on CeO2-intercalated clay catalysts (named V2O5/Ce-Lap catalysts) with mesoporous structure and high specific surface area were prepared. The structural characteristics and physicochemical properties were studied in detail. These catalysts were evaluated for the H2S selective oxidation. It was revealed that all V2O5/Ce-Lap catalysts showed high catalytic activities in the temperature range of 120–220 °C due to the redox reaction of highly dispersed V5+ species, and the catalytic mechanism obeyed a redox process, i.e. a stepwise mechanism. Additionally, the chemically absorbed oxygen also played an important role in H2S selective oxidation. Among them, the 5% V2O5/Ce-Lap catalyst presented the best catalytic activity and excellent regenerability at 180 °C. Finally, the catalyst deactivation mechanism was explored.