Abstract
The acid-base and oxidizing-reducing properties of cerium oxide evacuated or treated with hydrogen after evacuation at various temperatures and the catalytic activity for the isomerization of 1-butene were studied. No correlation was found between the oxidizing or reducing property and the catalytic activity. On the other hand, the activity was lost by the additions of both acidic carbon dioxide and basic ammonia molecules. The ratio of cis-2-butene to trans-2-butene was found to be high (4–6). The active sites have been concluded to be acid-base pair sites, though basic sites play a main role. The experiment on coisomerization of cis-2-butene- d 0 d 8 revealed that the isomerization proceeds intramolecularly via π-allylic carbanion intermediates. The two activity maxima appearing on pretreatment at 600 and 800 °C are considered due to the dehydration and/or decarboxylation and the structural change of cerium oxide, respectively.
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