Selective catalytic oxidation of H₂S over iron oxide supported on alumina-intercalated Laponite clay catalysts.
Selective catalytic oxidation of H₂S over iron oxide supported on alumina-intercalated Laponite clay catalysts.
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DOI：
10.1016/j.jhazmat.2013.05.008
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发表时间：
2013-09
影响因子：
13.6
通讯作者：
Xin Zhang;Guang-yu Dou;Zhuo Wang;Li Li-Li;Yufei Wang;Hailin Wang;Z. Hao
中科院分区：
文献类型：
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作者：
Xin Zhang;Guang-yu Dou;Zhuo Wang;Li Li-Li;Yufei Wang;Hailin Wang;Z. Hao
制备了一系列具有介孔结构和高比表面积的氧化铝插层粘土负载铁氧化物催化剂（Fe/Al-Lap催化剂）。通过氮吸附等温线、X射线衍射（XRD）、紫外-可见漫反射光谱（UV-vis DRS）、X射线光电子能谱（XPS）、傅里叶变换红外光谱（FTIR）、H2-TPR和NH3-TPD等技术研究了其结构和化学性质。在氧化环境中，氧化铁主要以孤立的Fe ~（3+）形式存在。Fe/Al-Lap催化剂在120-200 °C温度范围内表现出较高的催化活性，且不存在过量的O2。这可能是由于氧化铁与氧化铝之间的相互作用，有效地改善了Fe 3+的氧化还原性能。此外，催化剂的强酸性和氧化铁的良好分散性也有利于氧化反应的进行。其中，7%Fe/Al-Lap催化剂在180 °C时表现出最佳的催化性能。最后，对催化和失活机理进行了探讨。
A series of iron oxide supported on alumina-intercalated clay catalysts (named Fe/Al-Lap catalysts) with mesoporous structure and high specific surface area were prepared. The structural and chemical properties were studied by nitrogen sorption isotherms, X-ray diffraction (XRD), UV–vis diffuse reflectance spectra (UV–vis DRS), X-ray photoelectron spectra (XPS), Fourier transform infrared spectroscopy (FTIR), H2temperature-programmed reduction (H2-TPR) and NH3temperature-programmed desorption (NH3-TPD) techniques. It was realized that iron oxide mainly existed in the form of isolated Fe3+in an oxidic environment. Fe/Al-Lap catalysts showed high catalytic activities in the temperature range of 120–200 °C without the presence of excessive O2. This can be attributed to the interaction between iron oxide and alumina, which improve the redox property of Fe3+efficiently. In addition, the strong acidity of catalysts and good dispersion of iron oxide were also beneficial to oxidation reaction. Among them, 7% Fe/Al-Lap catalyst presented the best catalytic performance at 180 °C. Finally, the catalytic and deactivation mechanisms were explored.