Ni–MnOx Catalysts Supported on Al2O3-Modified Si Waste with Outstanding CO Methanation Catalytic Performance

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• 作者：Xiaopeng Lu ; Fangna Gu ; Qing Liu ; Jiajian Gao ; Lihua Jia ; Guangwen Xu ; Ziyi Zhong ; Fabing Su
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2015
• 出版时间：December 23, 2015
• 年：2015
• 卷：54
• 期：50
• 页码：12516-12524
• 全文大小：728K
• ISSN：1520-5045

文摘

A series of MnO_x-promoted Ni catalysts supported on Si waste contact mass (W) modified by Al₂O₃ were successfully prepared by the deposition–precipitation method for CO methanation. Compared with the Ni catalysts directly supported on W, Ni/Al₂O₃–Si and MnO_x-promoted Ni–MnO_x/Al₂O₃–Si catalysts exhibited much better catalytic performance for CO methanation, particularly the latter, which exhibited the least decrease in CO conversion (1%) and lowest carbon deposit (0.3 wt %) in a 110 h lifetime test. The structural characterizations showed the highest Ni dispersion and highest oxygen vacancy concentration in the Ni–MnO_x/Al₂O₃–Si catalyst. The added Al₂O₃ improves the dispersion of Ni, and the MnO_x promoter can restrain the sintering and aggregation of Ni particles during the process of reduction and reaction at high temperatures and provides more oxygen vacancies, which is conducive to the removal of carbonaceous species on the catalyst surface for anticoking.