the present invention is directed towards a process that allows for the adjustment of hydrogen concentration in a syngas product or fischer - tropsch feedstock stream . in particular , the invention is identified as an improved process for producing syngas comprising a secondary chemical reaction , preferably a water gas shift reaction , that allows for the adjustment of the hydrogen concentration in a syngas product stream . ultimately , the present invention is for an improved process for converting hydrocarbon - containing gas to liquid hydrocarbons .