3.5 Catalytic activities on ozone decomposition
The catalytic activities of as-prepared MnOx catalysts
for ozone decomposition were evaluated at 30°C. As shown in Figure 7,
the ozone conversion of all the MnOx decreased with
reaction time. Nevertheless MnO2-H2-200
showed a better stability, and its ozone conversion kept above 96%
after 12h of reaction. While the conversion dropped to 87% for
MnO2, 43% for Mn2O3 and
12% for Mn3O4, respectively.
MnO2-H2-200 showed the best performance
of ozone decomposition due to the abundant surface oxygen vacancies
revealed by O2-TPD and XPS analysis.