Effect of Activated Carbon Supports on Removing H2S from Coal-Based Gases using Mn-Based Sorbents

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• 作者：Jiancheng Wang ; Fenglong Ju ; Lina Han ; Haochen Qin ; Yongfeng Hu ; Liping Chang ; Weiren Bao
• 刊名：Energy & Fuels
• 出版年：2015
• 出版时间：February 19, 2015
• 年：2015
• 卷：29
• 期：2
• 页码：488-495
• 全文大小：524K
• ISSN：1520-5029

文摘

A series of MnO_x/AC sorbents were prepared by a sub- or supercritical water impregnation method at different temperatures using three types of active carbons (ACs) as supports. The desulfurization activities of the MnO_x/AC sorbents were studied, and the physicochemical properties of fresh and used sorbents were characterized by X-ray diffraction analysis, X-ray photoelectron spectroscopy, scanning electron microscopy, and X-ray absorption near edge structure. The results indicate that the AC composition and preparing temperature affect the desulfurization activity of prepared sorbent by changing the form and dispersion of the active component. MnO_x/AC sorbent prepared at 350 掳C and active carbon AC(Z) from walnut shell as support presents the best desulfurization activity, holding above 22 h under the desulfurization level of nearly entire removing H₂S in hot coal-based gas with breakthrough sulfur capacity of 7.24 g of S/100 g of sorbent. It is found that the valence of Mn loaded on the different AC supports was various, which related directly to the activity and capacity of the H₂S removal from hot coal-based gases. The species, content, and the dispersion of the manganese oxide on the surface of the supports were dominated by AC properties. In addition, Mn₃O₄ is the main active component for the H₂S removal over MnO_x/ACs sorbents.