Preparation of Au/SBA-15 and Its Catalytic Activity for CO Oxidation

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, N-2 adsorption-desorption, X-ray diffraction, ultraviolet-visible diffuse reflectance spectroscopy, 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 degrees C. The catalyst showed good cycle stability and high resistance to sintering.