Applied Catalysis A: General, Vol.282, No.1-2, 189-194, 2005
Synergy effects between bismuth molybdate catalyst phases (Bi/Mo from 0.57 to 2) for the selective oxidation of propylene to arcrolein
In this work, the synergy effect between different phases of bismuth molybdate catalysts was investigated systematically. The catalysts were prepared by spray drying and had a Bi/Mo atomic between 0.57 and 2. It is found that the synergy effect is only observed in mixtures containing gamma-phase. A mixture with Bi/Mo ratio = 1.3 consisting of gamma- and alpha-phase, exhibits the highest activity. Less homogeneous 'artificial mixtures' exhibit reduced synergy effects when compared to homogeneous 'in situ mixtures'. (c) 2004 Elsevier B.V. All rights reserved.
Keywords:bismuth molybdates;synergy effect;spray drying;selective oxidation;propylene;catalytic activity