Gold catalysts on Co-doped ceria for complete benzene oxidation: Relationship between reducibility and catalytic activity

• Au catalysts on Co3O4 doped (5, 10 and 15 wt.%) ceria prepared by mechanical mixing.
• Highest catalytic activity in complete benzene oxidation (CBO) of Au10CoCeMM catalyst.
• Highest gold dispersion as well as highest reducibility of Au10CoCeMM sample.
• Correlation between reduction behavior and catalytic performance in CBO.

Very high catalytic activity in complete benzene oxidation (CBO) was observed over gold catalyst on prepared by mechanochemical mixing CeO2–Co3O4 (10 wt.% of dopant). It was significantly higher compared with gold catalysts supported on ceria doped with 5 wt.% or 15 wt.% Co3O4. The presence of Co3O4 phase and Co-modified ceria was observed by XRD data. The HRTEM/HAADF results revealed that the doping with 10 wt.% Co3O4 was favorable for the higher gold dispersion. The highest reducibility, i. e. ability of oxygen supplying of gold catalyst on ceria doped with 10 wt.% Co3O4 correlates with the highest oxidation activity in CBO.

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