A Review on Preferential Oxidation of Carbon Monoxide in Hydrogen Rich Gases

In this review, recent works on the preferential oxidation of carbon monoxide in hydrogen rich gases for fuel cell 9 applications are summarized. H2 is used as a fuel for polymer-electrolyte membrane fuel cell (PEMFC). It is produced by 10 reforming of natural gas or liquid fuels followed by water gas shift reaction. The produced gas consists of H2, CO, and CO2. In 11 which CO content is around 1%, which is highly poisonous for the Pt anode of the PEMFC so that further removal of CO is 12 needed. Catalytic preferential oxidation of CO (CO-PROX) is one of the most suitable methods of purification of H2 because of 13 high CO conversion rate at low temperature range, which is preferable for PEMFC operating conditions. Catalysts used for 14 CO-PROX are mainly noble metal based; gold based and base metal oxide catalysts among them Copper-Ceria based 15 catalysts are the most appropriate due to its low cost, easy availability and result obtained by these catalysts are comparable 16 with the conventional noble metal catalysts