The invention relates to a method for producing
hydrogen by reforming
methanol steam. The method comprises the following steps: taking
methanol and water as raw materials, enabling the
reaction temperature to be 410-460 DEG C, enabling the reaction
space velocity to be 3000-23000h<-1> (calculated based on gaseous
methanol), mixing the raw materials of the methanol and the water under the condition that the
molar ratio of methanol to the water is 1: (0.8-2.0) for
vaporization, then enabling the mixture to be in contact with a ZnO / ZnAl2O4 catalyst in a
fixed bed reactor, generating reformed gaswhich is rich in the
hydrogen, and separating the reformed gas by a
palladium membrane separator for producing pure
hydrogen gas. In the ZnO / ZnAl2O4 catalyst, the
zinc-aluminum
atomic ratio is more than 0.5: 1 and less than 2.5: 1. The method has the advantages of high reaction
space velocity, high reaction conversion rate and low CO concentration, and the catalyst is simple to prepare, good in stability, low in cost and the like, thereby being particularly applicable to the process of integrating the
hydrogen production by reforming the methanol steam with
palladium membrane separation for preparing the pure hydrogen, and being capable of being used for industrial production process.