Abstract: A process for the production of high purity hydrogen from a naphtha catalytic reformer having a first catalytic zone in a lead position followed by a second catalytic zone in a lag position operating at similar inlet temperatures to produce a predetermined conversion wherein the inlet temperature of the second catalytic zone is reduced to thereby reduce the concentration of carbon monoxide in the net hydrogen product stream and the inlet temperatures of the first catalytic zone is increased to restore the predetermined conversion.

Abstract: A process for the production of high purity hydrogen from a naphtha catalytic reformer wherein the reformer is firstly operated at a predetermined catalyst circulation rate to produce hydrogen gas containing carbon monoxide and secondly the catalyst circulation rate is reduced to produce hydrogen gas having a lower concentration of carbon monoxide.