Regeneration of Fe鈥揨n鈥揅u Sorbents Supported on Activated Lignite Char for the Desulfurization of Coke Oven Gas

详细信息    查看全文

• 作者：Yu Feng ; Jinxiao Dou ; Arash Tahmasebi ; Jing Xu ; Xianchun Li ; Jianglong Yu ; Fengkui Yin
• 刊名：Energy & Fuels
• 出版年：2015
• 出版时间：November 19, 2015
• 年：2015
• 卷：29
• 期：11
• 页码：7124-7134
• 全文大小：759K
• ISSN：1520-5029

文摘

In this paper, the regeneration characteristics of activated-char-supported Fe鈥揨n鈥揅u sorbents were studied. The desulfurization and regeneration experiments were carried out using a quartz fixed-bed reactor at ambient pressure. The effects of regeneration conditions, such as space velocity, temperature, and steam concentration, on the regeneration performance were examined. The crystal phase, chemical structure of activated components, and physical structure of sorbents before and after regeneration were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and Brunauer鈥揈mmett鈥揟eller (BET) surface area. The experimental results indicated that the char-supported Fe鈥揨n鈥揅u sorbents can be regenerated at temperatures above 500 掳C. The optimal regeneration parameters with a space velocity of 5000 h^鈥?, temperature of 700 掳C, and steam concentration of 50 vol % have been obtained. The result of regeneration by steam suggested that the BET surface area of the sorbent after regeneration was larger than that of the fresh sorbent, and steam can restore the physical structure of the sorbent and expand its aperture during regeneration. Regeneration using SO₂ was also studied under the optimal conditions. The XRD, FTIR spectroscopy, and XPS analyses indicated that the composite metal oxides in the sorbent formed during sulfidation were transformed into metal sulfides, which can be converted back to metal oxides during regeneration.