Abstract
Ce modified Mg-Al mixed metal oxides ( HTc-Ce) were prepared by aqueous reconstruction method. The construct and surface properties of catalysts were characterized by X-ray diffraction( XRD), X-ray photoelectron spectrometry( XPS), transmission electron microscopy( TEM) and N-2 adsorption and desorption isotherms. Aqueous reconstruction process promotes forming more defects on the Mg-Al mixed oxides, Ce is successfully embedded into the interlayer of hydrotalcite framework and enlarges its spaces, which improves the accessibility of active sites. The oxygen mobility of ceria increases the amount of basic sites on the surface. XPS results indicate that there is about 30% of Ce(III) in cerium oxides. Oxygen vacancies are beneficial to enhancing the ability of oxygen mobility. In situ diffuse reflectance infrared Fourier transform spectroscopy ( DRIFTS) verifies the augment of low. coordinated oxygen, CO2. temperature programmed desorption( CO2. TPD) experiment reveals that modification of Ce increases the densi