Since oxygen content is generally essential for the
combustion reaction, therefore the effect of oxygen content
on toluene conversion over the Cu-Mn/MCM-41 catalyst was
shown in Fig. 6. Under 1.5% oxygen by volume, toluene
conversion at a reaction temperature of 320 8C was only 12.5%,
while the conversion increased to 77.8% with increasing
oxygen content to 4.0% by volume, and reached 95.2 and
97.8% with further increasing the oxygen content to 8.8 and
18.3%, respectively. As expected, toluene conversion increases
with the increase in the inlet oxygen concentration. The same
trend is observed over the whole range of reaction temperatures,
and is shown more obvious below 8.8% of oxygen concentration.
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