A series of MnO
x
/Al2O3 catalysts were synthesized
by polyol and dry impregnation
methods and calcined in the range of 400–800 °C. The impact
of the preparation procedure and calcination temperature was investigated
to enhance the catalytic degradation of a single component and binary
mixtures of acetone and toluene at room temperature. The polyol method
produces catalysts with a higher surface area, smaller cluster size,
and lower oxidation state than the impregnation method. The results
indicated that the oxidation state of manganese shifted to lower values
by increasing the calcination temperature, which had a beneficial
influence on the catalytic performance. As calcination temperature
increases to 800 °C, the catalyst exhibited excellent catalytic
activity in acetone degradation while no significant change was observed
in degradation of toluene. In the binary mixture, toluene conversion
was promoted whereas the acetone conversion was inhibited. X-ray absorption
near-edge structure and extended X-ray absorption fine structure results
of the spent catalysts showed that, unlike acetone, toluene altered
the local structure of manganese oxides during the reaction. The catalyst
was susceptible for the reduction process with toluene due to the
accumulation of carbonaceous species resulting from incomplete oxidation
of toluene.
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