Abstract
Depolymerisation of paraldehyde in benzene catalysed by some silica and alumina based binary oxides has been studied. It is seen here that in all the cases, the acidity at pKa';; -3.0 best correlates with catalytic activity (first order rate constant K) and is cata lytically active for depolymerisation of paraldehyde. Mo03, W03 and VzOs supported on silica and alumina have acid sites at pKa';; -3.0, hence these are catalytically active. Silica and alumina based MgO, BeO and ThOz have very little acid strength at pKa';; -3.0 but have a number of weak acid centres at pKa';; +3.3, and these relatively weak acid sites have been found to be catalytically inactive. The observed rate constant values in case of silica supported catalysts are greater than those of the alumina supported catalysts. It is further observed that the rate of depolymerisation of paraldehyde is directly proportional to the acidity of the catalysts at pKa';; -3.0. The energies of activation have been found to be inversely proportional to the acidity of the catalysts.
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