反应Ⅰ(主):CH3OH(g)+H2O(g) CO2(g)+3H2(g) △H1=+49 kJ/mol
反应Ⅱ(副):H2(g)+CO2(g) CO(g)+H2O(g) △H2
反应Ⅲ:CH3OH(g) CO(g)+2H2(g) △H3=+90kJ/mol