STUDY OF MICROSTRUCTURE AND CATALYTIC ACTIVITY OF γ-Bi2MoO6 AND Bi2WO6 COMPOUNDS

Abstract

Bi 2 MO 6 (M=Mo, W) compounds were prepared for low-temperature oxidation. The catalysts were prepared by solid-state reaction. The structural changes were followed by X-ray diffraction, scanning electron microscopy, Auger electron spectroscopy and BET nitrogen absorption. Auger analysis shows that Bi 2 WO 6 catalysts have more bismuth on the surface than γ- Bi 2 MoO 6, although both samples are bismuth deficient as compared to the stoichiometric compound. The results regarding catalytic activity show that Bi 2 WO 6 prepared at 1073 K reaches total conversion of CO (100%) at a lower temperature when compared to γ- Bi 2 MoO 6. This indicates that Bi 2 WO 6 is a potential candidate to be used as catalyst in the CO to CO 2 oxidation.