High Quality Content by WIKIPEDIA articles! PROX is an acronym for PReferential OXidation, and refers to the preferential oxidation of a gas on a catalyst. The catalyser preferentially oxidises carbon monoxide (CO) using a heterogeneous catalyst placed upon a ceramic support. Catalysing agents include metals such as platinum, platinum/iron, platinum/ruthenium, gold nanoparticles as well as novel copper oxide/ceramic conglomerate catalysts. This reaction is a considerable subject area of research for fuel cell design. From the reaction of carbon monoxide with steam, carbon dioxide is evolved. The presence of CO impedes the reaction of H2/O2 and reduces the fuel cell efficiency by the absorption of CO onto the platinum anode. The PROX process allows for the reaction of CO via the water gas shift reaction (WGS), reducing CO concentration from approximately 0.5-1.5% in the feed gas to less than 10 ppm.

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