摘要
Phase composition and surface characterization of vanadium-phosphorus catalysts containing rare earth elements were investigated by means of X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), NH3-temperature programmed desorption (NH3-TPD) and so on. The catalysts were used for the selective oxidation of n-butane to maleic anhydride. Catalytic performance has been carried out in a fixed-bed reactor. Experimental results showed that yield of maleic anhydride was enhanced by 4%～15% over vanadium-phosphorus catalysts by the addition of rare earth elements. Rare earth elements as promotors played the role of increasing surface acidity of the catalysts.
Phase composition and surface characterization of vanadium-phosphorus catalysts containing rare earth elements were investigated by means of X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), NH3-temperature programmed desorption (NH3-TPD) and so on. The catalysts were used for the selective oxidation of n-butane to maleic anhydride. Catalytic performance has been carried out in a fixed-bed reactor. Experimental results showed that yield of maleic anhydride was enhanced by 4%～15% over vanadium-phosphorus catalysts by the addition of rare earth elements. Rare earth elements as promotors played the role of increasing surface acidity of the catalysts.
