| نویسندگان | نجمه هشیار -عبداله ایران خواه |
|---|
| تاریخ انتشار | ۲۰۱۴-۱-۰۱ |
|---|
| نمایه نشریه | SID |
|---|
چکیده مقاله
The CO preferential oxidation (PrOx) is one of the critical steps in hydrogen
production and purifi cation for Polymer Electrolyte Membrane Fuel Cell
(PEMFC). This reaction was investigated in the presence of excess hydrogen
over Cu/CeO2, Pt/CeO2 and Cu-Pt/CeO2 catalysts. The ceria supports was prepared
via precipitation method and Cu-Pt/CeO2 catalyst was synthesized by
sequential impregnation on ceria.
The catalysts were characterized by XRD. Comparison of ceria supported
copper and platinum showed that the activity of copper catalysts are higher
than platinum in PrOx process. Effect of platinum addition on ceria supported
copper was investigated, and the results showed that Pt promoter have
positive effect on CO conversion in low temperature (<110°C). Promotion
of Cu with Pt increases the CO conversion by 30% in comparison with unpromoted
Cu catalyst. It is mentioned that the platinum addition to copper only
promotes the Cu catalyst at low temperature. T higher temperatures, reverse
WGS reaction occurs and decreases the CO conversion