MCCULLAGH, E; RIGAS, NC; GLEAVES, JT; HODNETT, BK

1993

March

Applied Catalysis A-General

SELECTIVE OXIDATION OF BUTAN-2-ONE TO DIACETYL OVER VANADIUM PENTOXIDE - AN INVESTIGATION BY TEMPORAL ANALYSIS OF PRODUCTS

Published

()

BUTANONE OXIDATION DIACETYL SELECTIVITY (DIACETYL) VANADIUM PENTOXIDE

95

2

183

195

The selective oxidation of butan-2-one to diacetyl over vanadium pentoxide in the temperature range 250-350-degrees-C has been studied using the technique of temporal analysis of products. Evidence is presented that butan-2-one and molecular oxygen compete for the same adsorption sites on vanadium pentoxide. When O-18(2) was used as oxidizing agent only O-16 appeared in the product diacetyl indicating that the reaction of butan-2-one to diacetyl proceeds by interaction between the substrate and lattice oxygen. Acetoin (CH3COCHOHCH3) could be detected as an intermediate in the reaction network. In the experimental conditions of this study acetic acid was the major side product observed, and it was produced by decomposition of diacetyl. Smaller amounts of acetic acid were produced via oxidative cleavage of the enol form of butan-2-one.

0926-860X

10.1016/0926-860X(93)85073-X