The Preparation Of New Type Of Mo Catalysts For The Degradation Of Environmental Pollutants Performance

Molybdenum oxide has a variety of crystal phases. For synthesis of MoO3, different synthesis methods or different synthesis conditions will influence the structure, morphology and performance. The catalytic oxidation ability of pure MoO3 is limited, so this paper mainly studied the doping material of Ce. Comparing the performances of different degradation conditions and degradation environment, the optimal scheme for energy conservation and environmental protection is selected. In this paper, the main research contents and research results are as follows:(1) MoO3 samples. Ammonium molybdate tetrahydrate((NH4)6Mo7O24·4H2O) react with dilute nitric acid and produce the hexagonal structure of MoO3 (h-MoO3) in hydrothermal synthesis. This paper investigates the influences of the reaction temperature, reaction time and nitric acid content on the structure of MoO3, respectively.(2) Ce-doped MoO3 (Ce(x)/MoO3) samples. The samples are synthesized by wet impregnation and calcination methods while using the varied concentration of Ce(NO3)3·6H2O solution as the source of Ce. The as-prepared Ce-doped MoO3 catalysts are designated as Ce(x)/MoO3, where x represents the nominal mass percentage of CeO2 in Ce(x)/MoO3. The synthesized samples are characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and high-resolution transmission electron microscopy (HRTEM) et. al.(3) The degradation efficiencies of different type dyes have been mainly investigated at room temperature and normal atmospheric pressure (light-off) and light-on (visible light). Research shows that the Ce (5)/MoO3 has excellent degradation performance in comparision with the pure MoO3. It is amazing that the catalytic performance of Ce (5)/MoO3 has improved more than one hundred times in light-off or light-on condition. Besides, for visible light-on, the Ce doped catalysts have striking degradation performance because that the Ce doption has decreased band gap significantly from 2.96eV to 2.56 eV, which enhances the absorption ablity of light.In the studies, the catalytic properties of Ce(x)/MoO3 in the condition of light-off are firstly explored. This contribution is aimed to bring a new concept to develop an energy-saving reaction for environmental cleaning. At the same time the Ce doped MoO3 material are, for the first time, applied as photocatalyst. The amazing degradation performance also points out the new development direction for extending Mo material.