Data are reported for Gore's advanced PRIMEA® Membrane Electrode Assembly (Series 5621) with reformate at 101 kPa and at 70°C. The steady state polarizations curves for different NH3 concentrations (i.e., 80 and 200 ppm NH3) in neat reformate (40% H2, 17% CO2, and 43% N2) were measured and compared with a polarization curve for 500 ppm NH3 in neat H2. The polarization losses from neat hydrogen and neat reformate are discussed. The results show that cell performance was decreased when ammonia

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... introduced in the reformate (for example, the current density dropped from 825 to 200 mA/cm2 at 0.6 V). A cyclic transient test for 80 ppm NH3 was performed to determine rates of poisoning and recovery.