Abstract: The activities and durability of the oxidation of COat ambient temperature and humidity on nanometer Au/NiO prepared by using different methods were studied. It was found that the activities and durability of the catalysts were greatly changed with the preparation methods and calcining temperature. Active and durable catalyst can be obtained by careful control of the preparation procedures. Among the samples tested, Au/NiO prepared by the following conditions--Na₂CO₃solution was added into an aqueous solution of Ni(NO₃)₂, HAuCl₄and dodecylbenzene sulfonic acid sodium salt (DBS), the resultant precipitate was heated to 70 ℃ and washed with deionized hot water of 70 ℃, followed by drying at room temperature for 48 h, and then the precipitate was calcined at 300 ℃--showed the highest activity and durability, it was even able to oxidize CO completely at 20 ℃ in the presence of 1.8% water vapor for 27 h.

Key words: Carbon monooxide, Ambient temperature and humidity catalytic oxidation, Nanometer Au/NiO