STRUCTURE AND CATALYTIC ACTIVITY FOR PROP YLENE OXIDATION OF BI-MO-NBCOMPLEX OXIDE CATALYSTS

The structure and catalytic,activity for propylene oxidation of series oxides B2Mo3-3X-Nb2XO12-4X (X=0.00, 0.02, 0.05, 0.10, 0.15, 0.20, 0.2 5) have been studied by means of XRD, IR, Raman, SEM, ESR and so on. T he results showed that in the range of X < 0.25 the cataysts possessed a typical alpha-Bi2Mo3O12 structure, while the oxygen vacancies were formed due to the substitution of Nb5+ for Mo6+, and the concentration of randomly distributed oxygen vacancy passed through a maximum at X= 0.15. The catalytic activity was in parallel with the concentration of oxygen vacancy. The catalytic reaction obeyed Redox mechanism.