Synthesis and Characterization of 纬-Fe2O3 for H2S Removal at Low Temperature

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• 作者：Guan Huang ; Enyun He ; Zhongde Wang ; Huiling Fan ; Ju Shangguan ; Eric Croiset ; Zhongwei Chen
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2015
• 出版时间：September 2, 2015
• 年：2015
• 卷：54
• 期：34
• 页码：8469-8478
• 全文大小：640K
• ISSN：1520-5045

文摘

The performance of 纬-Fe₂O₃ as sorbent for H₂S removal at low temperatures (20鈥?0 掳C) was investigated. First, 纬-Fe₂O₃/SiO₂ sorbents with a three-dimensionally ordered macropores (3DOM) structure were successfully prepared by a colloidal crystal templating method. Then, the performance of the 纬-Fe₂O₃-based material, e.g., reference 纬-Fe₂O₃ and 3DOM 纬-Fe₂O₃/SiO₂ sorbents, for H₂S capture was compared with that of 伪-Fe₂O₃ and the commercial sorbent HXT-1 (amorphous hydrated iron oxide). The results show that 纬-Fe₂O₃ has an enhanced activity compared to that of HXT-1 for H₂S capture at temperatures over 60 掳C, whereas 伪-Fe₂O₃ has little activity. Because of the large surface area, high porosity, and nanosized active particles, 3DOM 纬-Fe₂O₃/SiO₂ sorbent shows the best performance in terms of sulfur capacity and utilization. Moreover, it was found that moist conditions favor H₂S removal. Furthermore, it was found that the conventional regeneration method with air at high temperature was not ideal for the composite regeneration because of the transmission of some amount of 纬-Fe₂O₃ to 伪-Fe₂O₃. However, simultaneous regeneration by adding oxygen in the feed stream allowed the breakthrough sulfur capacity of FS-8 to increase up to 79.1%, which was two times the value when there was no O₂ in the feed stream.