Desulfurization activity of nickel supported on acid-treated activated carbons

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• 作者：Jia-xiu Guo^a ; ^b ; ^{guojiaxiu@scu.edu.cn} ; Juan Liang^a ; ^b ; Ying-Hao Chu^a ; ^b ; Ming-Chao Sun^a ; Hua-Qiang Yin^a ; ^b ; Jian-Jun Li^a ; ^b
• 关键词：Activated carbons ; Nickel ; Desulfurization ; Surface functional groups ; Acid
• 刊名：Applied Catalysis A ; General
• 出版年：2012
• 期刊代码：4_0926860x
• 类别：ch
• 出版时间：16 April, 2012
• 卷：421-422
• 期：Complete
• 页码：142-147
• 文件大小：418 K

摘要

Activated carbons from coal were treated with different acids and used as carriers. Ni catalysts supported on untreated and treated activated carbons were prepared by the excessive impregnation method and characterized using Brunauer-Emmett-Teller surface area characterization, X-ray diffraction, and X-ray photoelectron spectroscopy. The desulfurization activity of granular catalysts was evaluated at a fixed bed under a simulated gaseous mixture. The results showed the following: (1) the order of desulfurization activity is AC < Ni/AC < Ni/AC-H₂SO₄ < Ni/AC-HNO₃; (2) the specific surface area of the original activated carbons (723 m²/g) is less than that of the activated carbons treated with nitric (831 m²/g) and sulfuric acid (803 m²/g); (3) acid treatment can affect the surface functional groups of activated carbons, and activated carbons treated with nitric acid can significantly increase CO or CO functional groups, which can enhance the desulfurization performance of the catalysts; and (4) Ni and NiO species coexist in the activated carbons before desulfurization, but after desulfurization, Ni and NiO species disappear and Ni₂O₃ is observed, indicating that Ni species could be involved in the desulfurization reaction.