The influence of forced concn. variations on the oxidn. of hydrocarbons over a Pt gauze catalyst was examd. The period was varied between 0 and 120 sec. The periodic method of operation avoided temp. problems occurring at high conversions under stationary conditions. In the oxidn. of butane, the mean catalyst temp. could be maintained at 252-332 Deg. In the oxidn. of cyclohexene, the influence on product distribution (CO-CO2) of the kind of process operation was shown. The selectivity of the intermediate CO was 7-55%, according to the time period. [on SciFinder (R)]