Dry reforming of methane over nickel catalysts supported on the cuspidine-like phase Nd₄Ga₂O₉

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• 作者：Veró ; nica Garc&#xed ; a ; Maria Teresa Caldes ; Olivier Joubert ; German Sierra Gallego ; Catherine Batiot-Dupeyrat ; Yves Piffard ; Jorge Andr&#xe9 ; s Moreno
• 关键词：Dry reforming ; Syngas ; Cuspidine-type phases ; Ni catalysts
• 刊名：Catalysis Today
• 出版年：2008
• 期刊代码：13_09205861
• 类别：ce
• 出版时间：April-June 2008
• 卷：133-135
• 期：Complete
• 页码：231-238
• 文件大小：1476 K

摘要

Carbon dioxide reforming of methane was studied over Ni catalysts supported on the cuspidine-like phase Nd₄Ga₂O₉. Attempts to prepare two types of materials were undertaken by combustion synthesis: Nd₄Ga_2(1−x)Ni_2xO_9−x compounds and Ni/Nd₄Ga₂O₉ samples containing 5, 10 and 15 wt%of Ni. The Ni-substituted Nd₄Ga₂O₉ phases could not be obtained, whereas the Ni/Nd₄Ga₂O₉ catalysts were prepared successfully. All catalysts exhibit activity towards dry reforming of methane. The best catalytic activity was observed at 800 °C for the catalyst with a Ni content of 10%reduced at 700 °C. After 12 h on steam, Ni particles were 10–20 nm in size, and no carbonaceous deposits were observed. A strong and complex interaction between nickel and the cuspidine Nd₄Ga₂O₉ support exists. This feature coupled with the moderate basicity of the cuspidine-type support could explain the weak Ni coarsening observed under reaction conditions and the good resistance to coking of the catalysts.