NOVELTY - The biological conversion of carbon-containing feed materials into a hydrogen-enriched product gas, comprises producing a synthetic raw gas, which contains hydrogen and carbon monoxide, from carbon-containing feed materials and subjecting the synthetic raw gas in a catalytically supported water-gas shift reaction for increasing the hydrogen proportion. The water-gas shift reaction is carried out in a supported ionic liquid phase reactor at 60-150degreesC and 1-5 bar. In the reactor, a suitable catalyst is present within a liquid ionicaly immobilized on a substrate.    USE - Biological conversion of carbon-containing feed materials into a hydrogen-enriched product gas (claimed), where the feed material is straw or wood.    ADVANTAGE - The procedure ensures economical conversion of carbon-containing feed materials into a hydrogen-enriched product gas with high purity.    DETAILED DESCRIPTION - The biological conversion of carbon-containing feed materials into a hydrogen-enriched product gas, comprises producing a synthetic raw gas, which contains hydrogen and carbon monoxide, from carbon-containing feed materials and subjecting the synthetic raw gas in a catalytically supported water-gas shift reaction for increasing the hydrogen proportion. The water-gas shift reaction is carried out in a supported ionic liquid phase reactor at 60-150degreesC and 1-5 bar. In the reactor, a suitable catalyst is present within a liquid ionicaly immobilized on a substrate. The feed materials are transferred with low pressure of less than 12 bar by pyrolysis of synthetic raw gas, which is supplied through a bypass to the water gas shift reactor and which is combined with the product gas from the shift reactor to a hydrogen-enriched product gas. The size of the bypass stream is regulated in such a manner that the hydrogen/carbon monoxide-ratio in the hydrogen-enriched product gas represents a defined value.    DESCRIPTION OF DRAWING(S) - The diagram shows a procedure for the biological conversion by carbon-containing feed materials into a hydrogen-enriched product gas.    Gas washing (1)    Supply of cleaned synthetic raw gas into a supported ionic liquid phase reactor (2)    Catalytic reaction (3)    Removal of hydrogen and carbon monoxide mixture (4)    Discharging gas mixture with increased pressure. (5)