where Vcat is the catalyst bed volume. In examining the
distributions of the mean reaction rates of MC, SR, DR, and their
summation at O/C = 1, Fig. 8 depicts that the strength of MC is
reduced a bit as the CO2/O2 ratio increases. The mean reaction rate
of SR decays from 0.06 to 0.01 kmol m3 s1 while the mean
reaction rate of DR increases from 0.049 to 0.09 kmol m3 s1
when the CO2/O2 ratio increases from 0 to 2. In other words, the
mean reaction rate of SR is reduced by a factor of 6, whereas the
mean reaction rate of DR is amplified by a factor of 1.8. This reveals
that the impact of CO2 addition on SR is more significant than on
DR. In regard to the summation of the three reactions, the
maximum value is 0.187 kmol m3 s1 which is located at CO2/
O2 = 0.2. This coincides with the syngas flow rate (Fig. 4b). Overall,
the summation has a trend to decrease with increasing CO2/O2
ratio, but the decaying extent is slight.