Abstract
In this work, the use of proton exchange membrane fuel cell (PEMFC) technology is demonstrated as a novel method to separate gaseous hydrogen (GH2) from gaseous helium (GHe). This was accomplished by operating a PEMFC system in an electrolytic mode to electrochemically oxidize hydrogen and transport it away from the inert GHe stream. Quantification of the amount of GH2 removed from the anode stream was determined by measuring the inlet and outlet GH2 concentration and the rate of the hydrogen oxidation reaction (HOR) using different techniques. Exit streams with < 50 parts per million GH2 concentrations were obtained. The HOR was shown modeled as a first order mass transport limited process for dilute GH2 streams at the limiting current density. A model based on a differential reactor design and first order kinetics is presented herein to obtain an estimate of the minimum active area required to remove specific quantities of GH2.
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