Figure 4
(a) Rates of o-xylene oxidation as a function of O2 over CeO2 nanocubes. The reaction rates were measured at 230 °C. The concentration of O2 was varied in the range of 5–30 vol% and the concentration of o-xylene was 200 ppm. The o-xylene conversion was adjusted to below 15% by varying the space velocity. (b) Rates of o-xylene oxidation as a function of o-xylene concentration over CeO2 nanocubes. The reaction rates were measured at 230 °C. The concentration of o-xylene was varied in the range of 25–300 ppm and the concentration of O2 was 20 vol%. The o-xylene conversion was adjusted to below 15% by varying the space velocity.
