CATALYTIC OXIDATION OF 1-BUTENE OVER BISMUTH MOLYBDATE CATALYSTS .V. KINETICS OF OXIDATION .A. PULSE REACTION KINETICS - EXPLORATORY EXPERIMENTS FOR A KINETIC INVESTIGATION

The kinetics of oxidation of 1-butene with oxygen on three types of bismuth molybdate catalysts were investigated in pulse experiments. For all the catalysts mentioned the kinetics can be expressed by a first-order dependency on the butene pressure and a zero-order dependency on the oxygen pressure. A slight deviation in the kinetics was observed for the Bi Mo = 2 1 catalyst, attributed to diene inhibition but not important enough to affect the kinetics. Low activation energies in the order of 10-11 kcal mole-1 were found for all the catalysts over a wide range of temperatures. A high activation energy of 33 kcal mole-1 was found with the Bi Mo = 2 1 catalyst at low temperatures when butadiene was admixed to the pulses of 1-butene and oxygen. A confirmation of the reduction-reoxidation mechanism, earlier proposed by us, was obtained with the pulse technique. © 1969.