Preparation of Sorbents Loaded on Activated Carbon to Remove H2S from Hot Coal Gas by Supercritical Water Impregnation

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• 作者：Biao Qiu ; Lina Han ; Jiancheng Wang ; Liping Chang ; Weiren Bao
• 刊名：Energy & Fuels
• 出版年：2011
• 出版时间：February 17, 2011
• 年：2011
• 卷：25
• 期：2
• 页码：591-595
• 全文大小：771K
• 年卷期：v.25,no.2(February 17, 2011)
• ISSN：1520-5029

文摘

A series of sorbents were prepared by depositing the oxide particles of Cu, Mn, and Zn onto the activated carbon (AC) using the supercritical water impregnation (SCWI) method. The morphology and structure, amounts of loading metals, pore volume, and surface area of sorbents were characterized by X-ray diffraction (XRD), inductively coupled plasma鈭抋tomic emission spectrometry (ICP鈭扐ES), and nitrogen sorption measurements. The sulfidation tests of sorbents were performed using a fixed-bed reactor under ambient pressure and simulated coal-derived gas. The results show that the metal-active component, preparation temperature, and impregnation time during SCWI are the main influencing factors of the desulfurization activity of the sorbent. These factors behave mainly by changing the micropore volume and surface area of sorbents and the dispersion of metal oxide particles on the support. The optimal SCWI conditions for preparing Mn-based sorbents are 0.46 mol/L precursor solution concentration, 380 掳C preparing temperature, and 30 min impregnation time. The addition of copper component could effectively promote the dispersion of manganese oxide. The Mn鈭扖u sorbents prepared by SCWI have high desulfurization efficiency and sulfur capacity compared to the single-metal sorbent. The desulfurization efficiency can be maintained at about 100% in the sulfidation time of 910 min, and the corresponding sulfur capacity is 5.58 g S/100 g sorbent for the sorbent with a 3:7 molar ratio of Mn/Cu prepared by SCWI.