Abstract
The effects of the addition (10 atomic%) of lanthanoid oxides into Co3O4 on the oxidation of methyl ethyl ketone (MEK) were studied. The addition of La2O3 brought about marked enhancement of the rate of biacetyl (BA) formation. MEK conversion increased by a factor of 2.8 and the BA selectivity was improved at 450–500K owing to the suppression of deep oxidation. The addition of CeO2 much improved the MEK conversion but BA selectivity decreased to less than 50% and the scission reaction leading to acetaldehyde and acetic acid was enhanced. The addition of Pr6O11 improved MEK conversion but the addition of Nd2O3, Gd2O3, or Er2O3 showed little effect on MEK conversion. The reduction of both scission reaction and deep oxidation and the compensative increase in BA selectivities were observed. An approximately linear relationship was found between the specific rate of BA formation of the catalysts and logarithmic solubitity product constants of hydroxides of tervalent lanthanoid elements added, suggesting that t...
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