A comparative study of catalytic CO oxidation and selective CO oxidation over Pt/Al 2 O 3 and CeO 2 -promoted Pt/Al 2 O 3 catalysts has been investigated for the removal of a trace amount of CO from the reformed gas. The catalysts were pre pared by sol gel and incipient wetness impregnation. CO oxidation and selective CO oxidation were carried out with a 5%Pt/Al 2 O 3 and a 5%Pt/15%CeO 2 /Al 2 O 3 . The presence of 15%CeO 2 inthe 5%Pt/Al 2 O 3 dramatically improves the ac tivities to CO oxidation and selective CO oxidation at low temperature (<18 0 ℃ ). FTIR results indicate that CO could react with lattice oxygen from ceria and release CO 2 as a product. Low space velocity would obtain high CO conversion at low temperatures while high space velocity would obtain high CO conversion at high temperatures. The results also show that a 5%Pt/15%CeO 2 /Al 2 O 3 can completely oxidize 1% CO at18 0 ℃ with selectivity of 52% and space velocity of70,000 cm 3 · g -1 · h -1 . Under the realistic gas feed with 1%O 2 , this catalyst is very stable and retains its activity and selectivity at18 0 ℃ during 72 h.
KeywordsCO OxidationCeO<sub>2</sub>-Pt/aluminaCO AdsorptionSelective CO OxidationFuel Processing
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