Stable low-temperature dry reforming of methane over mesoporous La₂O₃-ZrO₂ supported Ni catalyst

详细信息    查看全文

• 作者：Sergey Sokolov ; Evgenii V. Kondratenko ; Marga-Martina Pohl ; Axel Barkschat ; Uwe Rodemerck ; ^{uwe.rodemerck@catalysis.de}
• 关键词：Carbon dioxide ; Methane ; Synthesis gas ; Dry reforming ; Coke formation ; Mesoporous ; Macroporous
• 刊名：Applied Catalysis B: Environmental
• 出版年：2012
• 出版时间：2012
• 年：2012
• 卷：113-114
• 期：Complete
• 页码：19-30
• 全文大小：2885 K

文摘

A series of supported Ni catalysts was prepared using various supports and tested in low-temperature (400 ¡ãC) dry reforming of methane. Ni/La₂O₃-ZrO₂ showed near-to equilibrium yields of CO and H₂ and the highest stability. This catalyst was studied in greater detail in order to determine the influence of the support morphology on the catalyst activity and stability. To this end, nonstructured, mesoporous, and macroporous La₂O₃-ZrO₂ were prepared and characterized before and after loading with Ni. Among them, only Ni on the mesoporous support showed practically no change in activity over 180 h on-stream, whereas the others deactivated. Formation of graphene-like coke layers on the catalysts and of NiO shell over Ni particles appears to be responsible for catalyst deactivation, while sintering of Ni did not play a major role. The enhanced stability of Ni on the mesoporous La₂O₃-ZrO₂ is attributed to stronger interaction of the Ni particles with the support stemming from a pore confinement effect.