Abstract: The nano-Au catalyst samples were prepared by a facile deposition-precipitation method with SBA-15 as support, and the effects of pretreatment conditions and Au loading on the catalyst activity for CO oxidation were studied. The catalyst samples were characterized by high resolution transmission electron microscopy, N2 adsorption-desorption, X-ray diffraction, ultraviolet-visible diffuse reflectance spec-troscopy, X-ray photoelectron spectroscopy, and inductively coupled plasma-atomic emission spectroscopy. The results showed that the Au particles were highly dispersed in the channels of SBA-15 after reduction and subsequent calcination. The sample pretreated by reduction and calcination exhibited high low-temperature activity and high catalytic activity when the reaction temperature was as high as 500 oC. The catalyst showed good cycle stability and high resistance to sintering.

Key words: gold, SBA-15 zeolite, supported catalyst, carbon monoxide, low-temperature oxidation, cycle stability, thermal stability