Effect of synthesis method on physicochemical properties and VOCs activity of Ce-Co and Co-La oxide

What is it about?

Ce–Co and La–Co mixed oxides were synthesized by two different methods: exotemplating and evaporation. The obtained catalysts were evaluated for volatile organic compounds (VOCs) abatement, using toluene as model molecule. The results obtained showed the superiority of mixed oxides compared to single oxides in toluene oxidation. Ce–Co mixed oxides were more active than La–Co samples. For Ce–Co materials, the exotemplating method produced catalysts which were the most active.

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Why is it important?

Ce–Co and La–Co oxides were prepared by exotemplating and evaporation methods. The materials obtained were tested as catalysts for toluene oxidation to CO2. Ce–Co materials prepared by exotemplating were the most active. A high concentration of weak acid sites is favourable for catalytic activity. A Mars–van Krevelen mechanism can explain the acidity–activity correlation.