2.4 Catalyst Activity Measurement
The activity of as-prepared samples for ozone decomposition was measured in a fixed bed continuous flow quartz reactor (6 mm i.d) using 0.1g of catalyst with size of 40-60 mesh at a temperature of 30oC. The total gas flowrate was 1000 mL/min with 500 mL/min air and 500 mL/min Ar, then the weight space velocity was 600,000 mL.h-1.g-1. Ozone was generated by the electrical stimulation of oxygen (OSAN, Dalian) and the inlet ozone concentration was 15 ppm. An ozone analyser (Model 49i, Thermo Scientific, USA) was used to detect the inlet and outlet ozone concentrations. The ozone conversion was calculated on the basis of inlet and outlet O3 concentration (C ) as follows:
O 3 conversion = (C in -C out)/C in × 100% (6)