3.4. Reaction characteristics of CPOM
The reaction rate contours of methane combustion (MC), steam
reforming (SR), and dry reforming (DR) at O/C = 1 and CO2/O2 = 0,
0.2, and 1 are displayed in Fig. 7. It is evident that the influence of
CO2 addition on MC is fairy slight. This comes from the fact that MC
is governed by the reaction between CH4 and O2, whereas CO2
almost plays no part in the combustion. Both SR and DR are the
endothermic reactions. When more CO2 is included in the feed gas,
it substantially intensifies DR but SR is inhibited. This is consistent
with the phenomena of H2 and CO formation observed in Fig. 4a.
The mean reaction rate of a chemical reaction is defined as