This study presents an analysis of coupling steam, CO2 and O2 reforming of CH4 using the thermodynamic equilibrium constant method. Effects of molar ratio of O2/CH4, H2O/CH4 and CO2/CH4 on reforming characteristics in both carbon deposition and carbon-free systems are analyzed. The results indicate that CH4 conversion rate, H2, and CO yield increase with increasing O2/CH4 molar ratio in two systems. In addition, the carbon elimination is achieved when O2/CH4 ratio increases to 0.31, and changing the amount of O2 can be an effective way to alter n(H2)/n(CO) ratio in the carbon deposition systems. CH4 conversion rate increases with increasing H2O/CH4 ratio in the carbon-free system, while it declines in the carbon deposition system. H2O plays a role of altering n(H2)/n(CO) ratio, and its effects on two systems are opposite. The deposited carbon is totally eliminated when H2O/CH4 ratio increases to 0.645. The increase of CO2/CH4 molar ratio leads to a rapid increase of CO2 conversion when CO2/CH4 ratio is less than 0.5. A slightly change of CO2/CH4 ratio can result in a huge difference on n(H2)/n(CO) ratio in both systems, and carbon elimination is achieved at CO2/CH4 = 0.99. The analyzed results have theoretical significance to efficiently catalyze methane coupling.
Issue Section:
Fuel Combustion
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