Effect of Additives on Cracking Characteristics of Dust-Containing Tar over Nickel-Based Catalysts

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• 作者：Peng Liang ; Xiaohang Wang ; Yaqing Zhang ; Juan Yu ; Xiwang Zhang
• 刊名：Energy & Fuels
• 出版年：2016
• 出版时间：June 16, 2016
• 年：2016
• 卷：30
• 期：6
• 页码：5115-5121
• 全文大小：541K
• 年卷期：0
• ISSN：1520-5029

文摘

To develop tar-cracking catalysts with an industrial application value and to study the effect of dust species on the cracking characteristics of dust-containing tar, four kinds of modified nickel (Ni)-based catalysts were prepared by the incipient wetness impregnation method. Alkali and alkaline earth metal oxides K₂O and MgO and transition metal oxides CeO₂ and ZrO₂ were used as additives. The activities and stability performances of these catalysts were investigated in a fixed-bed apparatus. The additions of K₂O and MgO neutralized the acidity of the catalysts and reduced carbon deposition on the catalyst surface, and the additions of CeO₂ and ZrO₂ improved active ingredient dispersion. X-ray diffraction studies revealed that the (Zr_0.85Ce_0.15)O₂ solid solution has good stability. The 2% NiO/1% CeO₂/2% ZrO₂–Al₂O₃ catalyst shows the highest activity and stability among the four modified Ni-based catalysts. Depositions of different species of dust on the catalyst surface have different influences on the catalyst performance; MgO, CaO, and Fe₂O₃ increase the catalytic activity, while SiO₂ and Al₂O₃ decrease the catalytic activity.