ABSTRACT

Herein, a series of Fe–Ti bimetal oxide adsorbents were prepared by reduction–co-precipitation method, and their performance in removing low concentration H₂S at room temperature was investigated. The adsorbents were characterized by X-Ray diffraction (XRD), Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), Ultraviolet Visible diffuse reflectance spectroscopy (UV–Vis-DRS), X-Ray photoelectron spectroscopy (XPS) and N₂ adsorption–desorption. The results showed that the addition of Ti increased the specific surface area, pore volume and small oligomeric Fe₂O₃ of ferrihydrite. When the Fe/Ti molar ratio was 8:1, Fe–Ti bimetal oxide formed a large amount of oligomeric Fe₂O₃, and its specific surface area and pore volume reached 344.99 m²/g and 0.34 cm³/g, respectively. At this time, Fe–Ti bimetal oxide exhibited the highest breakthrough sulfur capacity of 222.8 mg/g. High temperature calcination caused Fe–Ti bimetal oxide to form small specific surface area and pore volume, and produced crystalline α-Fe₂O₃. And the breakthrough sulfur capacity of Fe–Ti bimetal oxide decreased with the increasing calcination temperature. In addition, the desulfurization process conformed to the unreacted shrinking nucleus model.

摘要

在此，采用还原-共沉淀法制备了一系列Fe-Ti双金属氧化物吸附剂，并研究了它们在室温下去除低浓度H _{2 S的性能。}采用X射线衍射(XRD)、扫描电子显微镜(SEM)、傅里叶变换红外光谱(FT-IR)、紫外可见漫反射光谱(UV-Vis-DRS)、X射线光电子能谱(XPS)对吸附剂进行表征) 和N ₂吸附-解吸。结果表明，Ti的加入增加了水铁矿的比表面积、孔容和小Fe ₂ O _{3低聚物。}当Fe/Ti摩尔比为8:1时，Fe-Ti双金属氧化物形成大量低聚Fe ₂ O_如图3所示，其比表面积和孔容分别达到344.99 m ² /g和0.34 cm ³ /g。此时，Fe-Ti 双金属氧化物的突破硫容量最高，为 222.8 mg/g。高温煅烧使Fe-Ti双金属氧化物形成较小的比表面积和孔容，生成结晶α-Fe ₂ O ₃。Fe-Ti双金属氧化物的突破硫容随着煅烧温度的升高而降低。此外，脱硫过程符合未反应缩核模型。