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)