NOVELTY - A selective permeation membrane reactor (10) comprises a separation tube (3) having a selective permeation membrane (31) which is disposed to communicate with reaction tube and which selectively allows the permeation of hydrogen in unreacted material gas and reacted gas generated in the reaction tube to separate hydrogen as a concentrated hydrogen-containing gas containing carbon monoxide; and a reforming reaction catalyst (4) which is disposed between the reaction tube and the separation tube and which promotes the reforming reaction of the material gas.    USE - A selective permeation membrane reactor for manufacture of hydrogen gas used as reformed gas in the fields of fuel cells e.g. phosphate and solid polymer fuel cells.    ADVANTAGE - The selective permeation membrane has excellent permeation performance and a separation performance capable of maintaining a leakage at a practically acceptable level from the aspect of the reaction; has an excellent reaction promoting property; and is capable of recovering highly pure hydrogen with an efficient CO methanation reaction, but effective suppression of methanation reaction of CO2 to be contained in a hydrogen-containing gas.    DETAILED DESCRIPTION - A selective permeation membrane reactor (10) comprises:    (1) a section for supplying a material gas (1);    (2) a gas inlet portion (21) through which the material gas supplied from the part of material gas supply is introduced;    (3) a main body portion in which the introduced material gas through the inlet portion is subjected to a predetermined reforming reaction to generate a reacted gas;    (4) a reaction tube (2) having a gas outlet portion (23) through which the reacted gas and an unreacted material gas are taken out;    (5) a separation tube (3) having a selective permeation membrane (31) which is disposed to communicate with the reaction tube and which selectively allows the permeation of hydrogen in the unreacted material gas and the reacted gas generated in the reaction tube to separate hydrogen as a concentrated hydrogen-containing gas containing carbon monoxide (CO);    (6) a separation discharge port (32) which discharges the separated concentrated hydrogen-containing gas;    (7) a reforming reaction catalyst (4) which is disposed between the reaction tube and the separation tube and which promotes the reforming reaction of the material gas; and    (8) a unit for removing CO which is disposed to communicate with the separation tube and which reduces CO contained in the concentrated hydrogen-containing gas discharged from the separation discharge port of the separation tube.    The part for removing CO having a catalyst layer is provided with a methanation catalyst (5) to perform a methanation reaction to reduce carbon monoxide concentration contained in the concentrated hydrogen-containing gas, and a section for controlling reaction temperature by setting temperature of the catalyst layer for the methanation reaction at 250-350degrees C to selectively treat CO. The catalyst layer to perform the methanation reaction includes a zirconia-containing carrier which carries a metal of the group VIII. An INDEPENDENT CLAIM is included for a method of manufacturing a hydrogen gas.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic view showing a selective permeation membrane reactor.    Material gas (1)    Reaction tube (2)    Separation tube (3)    Reforming reaction catalyst (4)    Methanation catalyst (5)    Selective permeation membrane reactor (10)    Gas inlet portion (21)    Gas outlet portion (23)    Selective permeation membrane (31)    Separation discharge port (32)