Copper oxide shape effect in CeO₂/Cu₂O catalysts for PROX reaction
by Jiyeon Kim; Hyunjoo Lee
International Journal of Nanotechnology (IJNT), Vol. 10, No. 8/9, 2013

Abstract: Cubic and octahedral Cu₂O nanocrystals were used as supports for ceria deposition. Ceria tended to deposit on the vertexes and edges of the nanocrystals more. Whisker type of ceria was deposited on Cu₂O surface. The prepared CeO₂/Cu₂O composite materials were tested as catalysts for preferential oxidation (PROX) reaction of CO in the presence of abundant H₂. As the amount of ceria became higher (e.g., 1 wt% vs. 10 wt%), CO conversion was higher. Cubic nanocrystals showed higher activity than octahedral nanocrystals, especially at lower temperature region. Also, the activity depended significantly on the oxidation state of copper oxide. When CeO₂/Cu₂O catalysts were oxidised first then used for PROX reaction, the activity was enhanced. Cu₂O turned into CuO with a slight shape change after oxidation at 400°C. The activity degraded at higher reaction temperature because the copper oxide was reduced to metallic copper.

Online publication date: Thu, 01-Aug-2013

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