CATALYTIC DECOMPOSITION OF OZONE IN AIR

The catalytic decomposition of ozone was investigated by using a tubul ar fixed-bed reactor. The performance tests and reaction kinetic studi es were conducted for two catalysts, i.e., MnO2 and Pt/gamma -Al2O3 (s ymbolized as Dash-220). The experiments were carried out at various co nstant reaction temperatures (288-338 K) and space velocities (24,000 - 65,000 hr(-1)). The decomposition efficiencies of ozone with values higher than 99 % can be achieved at low temperatures (e.g., 338 K) and moderate space velocities (e.g., 35,000 h(-1)). The results indicated that the Dash-220 catalyst gave higher decomposition performance than MnO2 catalyst at the same reaction conditions. For the reaction kinet ics, it was found that the pseudo-first-order chemical reaction kineti c equation was appropriate for the catalytic decomposition of ozone in vestigated in this study. The apparent activation energies for MnO2 an d Dash-220 catalysts are 53.2 and 51.1 kJ mol(-1), respectively. The c orresponding pre-exponential factors are 1,863 and 3,681 mol (s g-cat, (mol m(-3)))(-1), respectively.