Effects of MoO₃ loading and calcination temperature on the activity of the sulphur-resistant methanation catalyst MoO₃/¦Ã-Al₂O₃

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• 作者：Baowei Wang^a ; Guozhong Ding^a ; Yuguang Shang^a ; Jing Lv^a ; Haiyang Wang^a ; Erdong Wang^a ; Zhenhua Li^a ; Xinbin Ma^a ; ^{xbma@tju.edu.cn} ; ^{wangbw01@gmail.com} ; Shaodong Qin^b ; Qi Sun^b
• 关键词：Synthetic natural gas ; Methanation ; Alumina ; MoO3 loading ; Calcination temperature
• 刊名：Applied Catalysis A: General
• 出版年：2012
• 出版时间：26 July, 2012
• 年：2012
• 卷：431-432
• 期：Complete
• 页码：144-150
• 全文大小：1393 K

文摘

The effects of calcination temperature and MoO₃ loading on the syngas methanation performance of MoO₃/¦Ã-Al₂O₃ catalyst prepared by the incipient-wetness impregnation method were studied. Mo-Al/25 catalyst (?.04 Mo/nm²) calcined at 600 ¡ãC reached maximum activity with 46.45 % CO conversion. All of the experimental results demonstrated that the saturated monolayer coverage of MoO₃ over a ¦Ã-Al₂O₃ support was closet to 25 wt. % MoO₃. It was discovered that tetrahedrally coordinated Mo⁶⁺ (T), instead of octahedrally coordinated Mo⁶⁺ (O), is the active catalytic precursor in its oxidised state. Additionally, it was also confirmed that the presence of crystalline MoO₃ and Al₂(MoO₄)₃ species depended on not only the MoO₃ loading but also the calcination temperature.