Three dimensionally ordered macroporous CeO2-ZnO catalysts for enhanced CO oxidation

• Synthesis of three-dimensionally ordered macroporous CeO2-ZnO catalysts.
• Skeleton of macroporous structure is composed of the ZnO and CeO2 particles.
• Catalytic performance is determined by various properties.
• The 3DOM (2:1)CeO2-ZnO catalyst exhibits the superior catalytic activity.

Three dimensionally ordered macroporous (3DOM) ceria-zinc catalysts were prepared by colloidal crystal templated method. The CeO2-ZnO catalysts possess 3DOM skeleton composed of CeO2 and ZnO nanoparticles with mesoporous of 2–4 nm. By solely modulating Ce/Zn molar ratio, phase compositions, surface elemental states and catalytic performance can be controlled. Compared with 3DOM CeO2 and ZnO, the 3DOM ceria-zinc catalysts exhibit higher catalytic activity, which results from the synergetic interaction between CeO2 and ZnO. The T100 (CO complete conversion temperature) of 3DOM sample is lower than the particle-type one, indicating the advantage of ordered macroporous structure in CO oxidation. The 3DOM(2:1)CeO2-ZnO catalyst shows catalytic stability in three-cycle test with T100 at 260–265 °C.

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