A First Order Solid Phase Reaction

Abstract

IN the course of an investigation on the kinetics of the thermal decomposition of ozone sensitised by the presence of bromine vapour, a very interesting reaction came to light. Under certain conditions as to temperature and concentration of ozone and bromine (see Z. f. anorg. Chem., 182, 182; 1929; Z. f. Elektrochemie, 35, 651; 1929), it was found that the bromine disappeared slowly but quantitatively from the gas phase and was deposited on the walls of the containing vessel as a solid oxide of bromine (hitherto unknown). Under these conditions of complete oxide formation, the residual ozone decomposed at a constant rate until nearly all of it had disappeared. The final result can be represented as 2O₃→3O₂.