1976 Volume 49 Issue 12 Pages 3367-3371
The oxidation of propylene with Cu2O as active phase for acrylaldehyde formation gave no acrylaldehyde in contrast to the fully oxidized CuO–SiC. However, CuO–SiC from which adsorbed oxygen species was eliminated gave rise to the formation of a negligible amount of acrylaldehyde. The presence of molecular oxygen species adsorbed on the CuO–SiC was shown by the desorption of oxygen and the isotopic mixing reaction of 16O–18O. The adsorbed oxygen (possibly molecular oxygen species) seems to be necessary as oxygen incorporated into acrylaldehyde. Agreement of the ratio of 18O/16O in acrylaldehyde formed by the oxidation with oxygen containing 18O over Cu216O with that of 18O/16O in the reaction mixture supports the role of adsorbed oxygen species. The presence of O2− over Cu2O during the course of oxidation was confirmed by the formation of furan and maleic anhydride in the co-oxidation with butadiene. The results were discussed in relation to the structure of the catalyst suitable for selective oxidation, the incorporation of oxygen atom via electronegative oxygen species adsorbed being proposed.
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