Dry reforming of methane over CeO2 supported Ni, Co and Ni–Co catalysts

• Published in: Applied catalysis. B, Environmental Environmental, 2015-12, Vol.179, p.128-138
• Main Authors: Ay, Hale, Üner, Deniz
• Format: Article
• Language: English
• Subjects: Calcination temperature; Ceria supported; Dry reforming of methane; Ni–Co
• ISSN: 0926-3373; 1873-3883
• DOI: 10.1016/j.apcatb.2015.05.013

[Display omitted] •CeO2 supported Ni, Co and Ni–Co catalysts were tested for dry reforming of methane.•Co/CeO2 catalyst exhibited much lower activity than Ni/CeO2 and Ni–Co/CeO2 catalysts.•TEM and reaction data indicate that Co/CeO2 system is more susceptible to the SMSI effect than Ni/CeO2.•The activities of ceria-based catalysts decreased with increasing calcination temperature. Ceria supported Ni, Co monometallic and Ni–Co bimetallic catalysts were prepared by incipient wetness impregnation method, calcined at two different temperatures (700°C and 900°C) and tested for dry reforming of methane reaction at 700°C. The activities of ceria-based Ni containing catalysts decreased with increasing calcination temperature accompanied by a decrease in coke deposition. While Ni/CeO2 and Ni–Co/CeO2 catalysts exhibited comparable high activities, Co/CeO2 catalysts exhibited very low activity. The lower activity of Co/CeO2 catalyst was attributed to strong metal support interaction (SMSI). The SMSI effect was confirmed with TEM images showing a layer of support coating the metal particles. The diversity of the deposited carbon structures in terms morphology (straight long filaments, highly entangled and curly shaped filaments, filaments with knuckle-like structure and carbon onions) was noted. In addition to the carbon buildup, the deactivation was observed to be due to the loss of active metals in the carbon filaments.