Palladium catalyst supported on stair-like microstructural CeO2 provides enhanced activity and stability for low-concentration methane oxidation

• Octahedral CeO2 (OCO) was self-assembled from nanosize rectangular block.
• As-synthesized CeO2 possesses stair-like microstructure.
• The Pd/OCO catalyst exhibit excellent activity and stability.
• Unique microstructure endows CeO2 potential application in catalysis.

Octahedral CeO2 microparticles possessing a stair-like microstructure comprising self-assembled nano-sized rectangular blocks were synthesized by a hydrothermal synthetic route. The samples were characterized by X-ray diffraction, scanning/transmission electron microscopy, and nitrogen adsorption/desorption techniques. The structural functions of the as-synthesized CeO2 as support for the Pd catalyst were investigated by the catalytic oxidation of low-concentration methane. The results showed that the unique stair-like structure of CeO2 improved the stability of the Pd catalyst for continuous conversion of low-concentration methane, which suggests that the as-synthesized CeO2 has potential application in the removal of low-concentration methane from ventilation air and other oxidations.

As-synthesized CeO2 octahedral possesses a stair-like microstructure and it is a novel support material for Pd catalyst, which exhibits enhanced properties in low-concentration methane oxidation.Figure optionsDownload high-quality image (153 K)Download as PowerPoint slide