常温常湿条件下Au/MeO~x催化剂上CO氧化性能

利用共沉淀法制备了Au/MeO~x催化剂(Me=Al,Co,Cr,Cu,Fe,Mn,Ni,Zn)。在常温常湿条件下，考察了不同氧化物负载的金基催化剂的CO氧化性能。结果表明，氧化物种类对催化剂的活性和稳定性均有较大的影响。Cu，Mn，Cr等氧化物负载的金基催化剂的活性较差，而Zn，Fe，Co，Ni，Al等金属氧化物负载的金基催化剂可将CO完全氧化，又具有一定的稳定性，在相同反应条件下，CO完全转化时的稳定性顺序为Au/ZnO>Au/α-Fe~2O~3>Au/Co~3O~4>Au/γ-Al~2O~3≈Au/NiO。还发现水对Au/MnO~x催化剂的活性和稳定性有负作用，而对180℃焙烧制备的Au/ZnO-180催化剂的活性和稳定性均有明显的湿度增强作用。

CO oxidation over Au/MeO~x at ambient temperature and humidity

Au/MeO~x (Me=Al, Co, Cr, Cu, Fe, Mn, Ni, Zn) catalysts were prepared by a coprecipitation method, and their catalytic performance for CO oxidation at ambient temperature and humidity was investigated. It was found that the activity and stability of Au/MeO~x were strongly dependent on the type of metal oxide support. among the samples tested, th eAu-based catalysts supported on the oxides of Zn, Fe, Co, Ni and Al showed high activity, i. e. they can oxidize CO to CO~2 completely at the given reaction condition. It was also found that these catalysts had excellent stability, the stability sequence was Au/ZnO>Au/α-Fe~2O~3>Au/Co~3O~4>Au/γ-Al~2O~3≈Au/NiO. The effect of water vapor on the activity and stability were also studied, and a positive effect for Au/ZnO and negative effects for Au/MnO~x were observed.