Deactivation analyses of CeO2/CuO catalysts in the preferential oxidation of carbon monoxide
Abstract
The hydrothermal in combination with impregnation methods are used to prepare the CeO2/CuO-X catalysts with spherical structure. The catalysts are characterized via SEM, XRD, H2-TPR, HRTEM, XPS and N2 adsorption-desorption techniques. The study shows that the microspheres of CuO consist of the sheet-like CuO and the way of arrangement results in the formation of shell structure. There is a core in the middle of shell structure, which is composed of the nano-sized CuO particles. CeO2 particles are supported on the surface of the CuO microspheres or embedded in the pores of sheet-like CuO. It is found that there is another reason for the decrease of CO conversion above 155 °C except H2 competitive oxidation. It is from the change of the CeO2/CuO catalyst during CO-PROX reaction including the reduction of CuO and the separation of metallic copper from the surface of catalyst.
- Publication:
-
Journal of Power Sources
- Pub Date:
- September 2014
- DOI:
- 10.1016/j.jpowsour.2014.03.043
- Bibcode:
- 2014JPS...261...46Z
- Keywords:
-
- Hydrogen;
- Cerium-copper catalysts;
- Deactivation;
- Preferential oxidation of carbon monoxide