Abstract
The effect of bismuth content in Mo-Pr-Bi-O catalysts used for propene oxidation has been studied. The catalytic activity for the overall oxidation process goes through a maximum for a Bi:Mo atomic ratio of 0.075. Selectivity for acrolein undergoes a remarkable increase and selectivities for other partial oxidation products decrease with increasing bismuth content. The catalytic activity of oxidation and selectivity for acrolein are much higher than those recorded on Mo-Pr-O catalysts. The surface acidity exhibited a maximum at the same Bi:Mo atomic ratio which yielded the maximum catalytic activity. X-ray photoelectron spectroscopy data indicated that bismuth is uniformly distributed in the catalysts up to a Bi:Mo ratio of 0.075, but a surface enrichment of bismuth occurred at higher bismuth contents. The catalytic properties for oxidation are discussed in terms of the acidic properties of the samples.
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