Figure 11 . H2-TPR profile of
MnO2-H-200 at different ozone conversion (1, 0.6 and
0.2)
In order to further confirm the influence of the accumulation of
O2*on the catalysts, the structures of
MnO2-H-200 before and after reaction were analyzed by
XRD as shown in Figure 12. The diffraction peaks of the reacted
catalysts corresponded well to the standard PDF card (JCPDS 72-1984) of
MnO2 and no extra impurities were observed, which
indicated that the accumulation of O2*had slight effect on the catalyst crystal structure or the changes were
too trivial to detect.