| Summary: | 碩士 === 國立臺灣大學 === 環境工程研究所 === 84 === The decompositions of hazardous ozone gas were investigated
over commercial platinum alumona catalyst and manganese
deoxide, respectively. The performance tests were various space
velocities(15,000-60,000 1/hr). The reaction kinetic studies
were carried out by the use of steady state plug flow reactor.
About 99.8 % destruction efficiency of ozone with inlet
concentration of 0.15-0.19 mol/m3 was obtained at a catalyst
and a reaction temperature of 323 K for platinum alumina
destruction efficiency of ozone with the same concentration at
a higher catalyst contact time of 0.1 sec.(space velocity of
about 38.000 1/hr) and a higher reaction temperature of 338 K.
The results indicated that the platinum alumina catalyst gave
higher conversions of ozone than manganese dioxide at the same
conditions. For reaction kinetics, it was found that the first
order reaction mechanism was appropriate for the catalytic
decomposition of ozone investigated in this study. The proposed
first order reaction model gave good agreement with the
experimental results. The activation energies for catalytic
decompositions of ozone on platinum alumina catalyst and on
manganese dioxide were 51.1 and 53.2 kJ/mol, respectively. The
corresponding pre-exponential factors were 3,681 and 1,863 mol/(
s.g catalyst.(mol/m3)), respectively.
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