High potential of mesoporous ceria/ceria-zirconia synthesized via nanocasting pathway for catalytic applications

S. Jampa, A. Luengnaruemitchai, T. Chaisuwan, S. Wongkasemjit
Chulalongkorn University,
Thailand

Keywords: mesoporous ceria/ceria-zirconia, catalytic applications

Summary:

Presently, nanocasting process, an alternative synthesis pathway, has been widely employed to synthesize and design ordered nonsiliceous mesoporous materials. In this work, mesoporous ceria (CeO2) and mesoporous ceria-zirconia (CeO2-ZrO2), were successfully prepared via nanocasting method using siliceous MCM-48 mesoporous material as a hard template. The synthesized mesoporous CeO2 and CeO2-ZrO2 provided ordered structure with high specific surface area around 260 m2g-1. These two synthesized mesoporous materials were characterized by X-ray diffraction (XRD), Transmission electron microscopy (TEM) and N2 adsorption-desorption. Copper (Cu) loaded onto the mesoporous CeO2 and CeO2-ZrO2 supports by deposition-precipitation (DP) method exhibited high dispersion of Cu species, as confirmed by XRD. The structures and properties of the synthesized Cu-CeO2 and Cu-CeO2-ZrO2 catalysts play a crucial role to interesting catalytic applications, such as preferential oxidation of CO (CO-PROX), oxidative steam reforming of methanol (OSRM). The Cu-CeO2 and Cu-CeO2-ZrO2 catalysts showed good potential for CO-PROX reaction with 100% CO conversion at 110° and 130 °C, respectively, and also exhibited excellent catalytic performance for OSRM reaction with 100% methanol conversion at 350° and 300 °C, respectively. It can be concluded that the prepared mesoporous CeO2 and CeO2-ZrO2 by nanocasting pathway are promising candidates to be used as support for CO-PROX and OSRM reactions.