【Abstract】 Due to coexisting of H₂, CO₂ and H₂O with CO in hydrogen-rich gas produced from methanol reforming, the selective CO oxidation is companied with the side reactions of H₂ oxidation, as well as CO or CO₂ methanation and reverse water-gas shift reaction（RWGS）. This paper investigated the effects of the above side reactions on the selective CO oxidation over a 0.5% Pt/Al₂O₃ monolithic catalyst. The results showed that after 50% H₂ is added into the reactants, the highest CO conversion is only 98.3% at 180℃ when the feed molar ratio of O₂ to CO is 1, and the corresponding outlet CO concentration is 180×10 -6 . Adding 50% H₂ into the reactants accelerate CO oxidation at low temperatures; the catalyst active reaction temperature window shifts down about 40℃ . CO produced from RWGS is 80×10 -6 at 200℃ indicating that the effect of RWGS on selective CO oxidation becomes obvious at temperatures higher than 200℃. On the other side, CO or CO₂ methanation does not take place even at 300℃ under current conditions and has little effects on the selective CO oxidation.更多还原