monoxide and carbon dioxide as a function of the reactant gas mass velocity are shown in fig3 for each of these tests the oxygen to methanol molar ratio was maintained at u02dc 0 25 the data indicate that the gas compositions are slightly affected by the mass velocity h 2 and co 2 decrease and co increases at higher mass velocities over the range of mass velocities tested hydrogen various from 37 to 39 carbon monoxide 16 to 18 and carbon dioxide 8 to 9 the product stream was found to contain 1 4 methanol and an average of 1 5 methane the product stream when passed through a water gas shift reactor would convert all the unreacted methanol and the carbon monoxide to carbon dioxide and hydrogen thus the shifted reformate neglecting further conversion of the 1 5 unreacted methanol in the gas would yield a product containing u2212 47 hydrogen dry basis this value is 9 lower than the theoretical maximum for these reaction conditions an important requirement of reformers for transportation fuel cell systems is their ability to provide varying amounts of hydrogen on demand while maintaining the product gas compositions the dynamic response of the reactor 10 was tested by imposing a step change in the reactant flow rates while maintaining a constant oxygen to methanol ratio an example is shown in fig4 where the methanol flow rate was increased by 33 from 30 to 40 ml min accompanied by a proportional increase in the air flow rate the resulting effect on hydrogen concentration and the temperatures just above and just.