NOVELTY - A feed gas stream containing hydrogen and a contaminant is introduced into adsorption module having adsorbents (A,B), steam reforming catalyst and water gas shift reaction catalyst. The adsorbents are chemically distinct, and one of the adsorbent (A or B) adsorbs contaminant in feed gas stream to produce purified gas stream of hydrogen. The purified stream is introduced to a fuel cell anode.    USE - For providing gas stream containing hydrogen to fuel cell anode, used for electric power generation, particularly for vehicle propulsion and for small scale stationary power generation.    ADVANTAGE - Purification of reformate hydrogen, energy-efficient pressure swing adsorption system (PSA) oxygen enrichment, heat recovery from the fuel cell stack and from combustion of hydrogen PSA tail gas, and thermal powering of air compression for the oxygen PSA and of any PSA vacuum pumping are performed so as to minimize the size of the fuel cell stack while maximizing overall energetic efficiency of energy conversion from the raw fuel. The hydrogen gas delivery system supplies purified hydrogen gas to the anode gas inlet, and recirculate hydrogen gas from anode gas exit back to anode gas inlet with increased purity so as to avoid accumulation of impurities in the anode channel. Even when high hydrogen purity is specified for the PSA, a small bleed from the end of the anode channel back to the feed pressurization step of the hydrogen PSA is avoided. The accumulation of contaminant due to equipment imperfections or operational transient upsets, is eliminated.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) separation of carbon monoxide from gas stream containing hydrogen, involves introducing the feed stream to the rotary pressure swing adsorption module for separating portion(s) of carbon monoxide, and introducing purified gas stream to fuel cell anode;    (2) electrical current generating system which has a gas source containing hydrogen, at least one adsorption module which partially purifies the gas, and at least one fuel cell defining an anode inlet for receiving purified gas stream from the adsorption module;    (3) system for supplying hydrogen gas to fuel cell anode which has hydrogen gas generating system having outlet for discharging gas containing hydrogen and contaminants, respective contaminant separation zones, and fuel cell anodes which is attached to the outlet of contaminant (B) separation zone; and    (4) process for providing gas stream containing hydrogen and oxygen-enriched gas stream to fuel cell which involves introducing the oxygen-enriched gas stream and purified hydrogen gas stream into fuel cell, introducing separation exhaust gas stream as fuel into combustion engine for driving devices such as compressors, vacuum pumps or electric generator.    DESCRIPTION OF DRAWING(S) - The figure shows an axial section of the rotary pressure swing adsorption systems module.    PSA module (1)