Liquid phase oxidation of cumene in the absence of solvent was carried out in a bubble column in temperature range from IOO°to I3O°C. The reaction scheme in the batch-wise operation was classified in terms of three periods: the induction, the steady chain-propagation and the termination periods.The kinetics in the steady chain-propagation period, which is industrially important, was studied and the rate expressions of chemical steps were derived.

It is shown that the substitution of V5+ by Mo6+ in Bi1‐x/3V1‐xMoxO4 (0 ⩽ x ⩽ 1) catalysts increases the catalytic activity in C3H6 oxidation without changing the selectivity.

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Solution photolysis of hexakis(isopropy1ammonium) heptamolybdate(V1) trihydrate, [ NH,Pr'],[Mo702,]*3H20 (l), at pH 5.4 leads to reduction to MoV with involvement of hydroxy-radicals, followed by decomposition to yellow and blue species. Propylene and acetone were detected as oxidation products but quantum yields for their formation were much lower than that for MoV formation. The irradiated single-crystal e.s.r. spectra revealed the formation of MoVO,(OH) in a MOO, octahedral site, which corresponded to the primary event in the solution photolysis. E.s.r. and Raman spectroscopy and flash photolysis were employed to elucidate the mechanism of these reactions.

Surface base property of magnesium oxide can be modified by the addition of metal ion. The addition of metal ion with larger ionic radius than Mg2+ causes the increase of the amount of surface base site, whereas the addition of metal ion with smaller ionic radius than Mg2+ shows not to be effective.