Impact of metal doping on the activity of Au/CeO2 catalysts for catalytic abatement of VOCs and CO in waste gases

The catalytic performance in the total oxidation of CO and methanol over gold catalysts supported on ceria doped by different metal oxides (Me = Fe, Mn and Co) was studied and a strong influence of the nature of dopant was observed. The activity towards the oxidation of CO and CH3OH was in the order: AuCeCo > AuCe > AuCeFe > AuCeMn. The characterization by XRD and HRTEM evidenced differences in the average size and the distribution of gold particles. AuCeCo catalyst exhibited superior low-temperature CO oxidation activity (100% conversion degree was obtained at 25 °C) and almost 100% total oxidation of CH3OH at about 40 °C. Higher hydrogen consumption was estimated by means of TPR over this catalyst. The effect of modification with Co3O4 of Au/CeO2 catalysts on their CO oxidation activity was further studied by varying of the dopant content (5, 10 and 15 wt.% Co3O4).

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► Au catalysts on ceria doped by metal oxides (Me = Fe, Mn, Co) were synthesized.
► Strong influence of the nature of dopant was observed.
► Doped by Co ceria-based Au catalyst demonstrated superior LT CO oxidation activity.
► Doping of ceria by 10 wt.% Co3O4 appeared beneficial for high and stable activity.