(WO9740542-A1)      Apparatus for the combined purification and compression of CO-containing hydrogen comprises: (a) a polymer electrolyte membrane (PEM) having a proton-leading polymer membrane (3); and (b) an anode on one side and a cathode (4) on the other side of the membrane. The anode is formed as a double layer anode (5) comprising a CO oxidation-selective catalyst layer (1) on the side away from the membrane and an electrochemically active layer (2) to oxidise the hydrogen to protons on the side facing the membrane. A porous planar gas distributing layer is provided on the anode side which is connected to a current collector so that the PEM cell maintains differential pressures of 10. Process taking place in the apparatus is also claimed.    USE -   The purified hydrogen is used as fuel gas for a PEM-fuel cell (claimed).    ADVANTAGE -   The apparatus is energy-efficient.    (EP958629-A1)      Apparatus for the combined purification and compression of CO-containing hydrogen comprises: (a) a polymer electrolyte membrane (PEM) having a proton-leading polymer membrane (3); and (b) an anode on one side and a cathode (4) on the other side of the membrane. The anode is formed as a double layer anode (5) comprising a CO oxidation-selective catalyst layer (1) on the side away from the membrane and an electrochemically active layer (2) to oxidise the hydrogen to protons on the side facing the membrane. A porous planar gas distributing layer is provided on the anode side which is connected to a current collector so that the PEM cell maintains differential pressures of 10. Process taking place in the apparatus is also claimed.    USE -   The purified hydrogen is used as fuel gas for a PEM-fuel cell (claimed).    ADVANTAGE -   The apparatus is energy-efficient.    (JP2001502105-W)      Apparatus for the combined purification and compression of CO-containing hydrogen comprises: (a) a polymer electrolyte membrane (PEM) having a proton-leading polymer membrane (3); and (b) an anode on one side and a cathode (4) on the other side of the membrane. The anode is formed as a double layer anode (5) comprising a CO oxidation-selective catalyst layer (1) on the side away from the membrane and an electrochemically active layer (2) to oxidise the hydrogen to protons on the side facing the membrane. A porous planar gas distributing layer is provided on the anode side which is connected to a current collector so that the PEM cell maintains differential pressures of 10. Process taking place in the apparatus is also claimed.    USE -   The purified hydrogen is used as fuel gas for a PEM-fuel cell (claimed).    ADVANTAGE -   The apparatus is energy-efficient.