(4) The sample exhibits the best catalytic activity (conversion)
for LPG combustion (92% at 400 C and 95% at 550 C) and
proved poor performances in the catalytic combustion of
toluene and benzene (50% conversion and 54% conversion
respectively over 400 C). The best catalytic activity is due
to both the powder composition and the preparation
method.
(5) The procedure of catalyst preparation affects the concentration
of oxygen defects, as well as the structure and activity of
the surface active sites. The complete gas oxidation over
SrMnO3 perovskite can be explained by assuming the contribution
of adsorbed oxygen and lattice oxygen.