Inderscience Publishers

Copper oxide shape effect in CeO 2 /Cu 2 O catalysts for PROX reaction

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Cubic and octahedral Cu
2
O 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 Cu
2
O surface. The prepared CeO
2
/Cu
2
O composite materials were tested as catalysts for preferential oxidation (PROX) reaction of CO in the presence of abundant H
2
. 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 CeO
2
/Cu
2
O catalysts were oxidised first then used for PROX reaction, the activity was enhanced. Cu
2
O turned into CuO with a slight shape change after oxidation at 400
o
C. The activity degraded at higher reaction temperature because the copper oxide was reduced to metallic copper.

Keywords: shape, copper oxide, ceria, oxidation, nanocatalyst, PROX

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