There is evidence that the catalytic action of manganese on the decomposition of potassium chlorate involves an alternate oxidation and reduction of the manganese. This evidence can be tested by enriching the oxygen of the catalyst with oxygen18 isotope. Oxygen liberated from chlorate decomposition with an enriched catalyst should contain oxygen18. Recently Forkushima et al (1) carried out a similar experiment. They enriched potassium chlorate with oxygen18 and decomposed it with Mn02.H20 containing ordinary oxygen. Water was formed from successive portions of the liberated oxygen. The density of this water was less than the density of water prepared from oxygen liberated from KC103 without a catalyst. They concluded that some unstable compound is formed between KC103 and Mn02, and that oxygen is liberated from this compound. They further concluded that only a limited portion of the catalyst is used in the reaction. In the present experiment the manganese dioxide was enriched with oxygen18, and the KC103 was normal. Isotopic ratios of liberated oxygen were determined directly by use of a mass spectrograph.
Proceedings of the Iowa Academy of Science
© Copyright 1955 by the Iowa Academy of Science, Inc.
Brown, F. E. and Woods, J. D.
"Oxygen18 as Tracer in the Catalytic Decomposition of Potassium Chlorate,"
Proceedings of the Iowa Academy of Science, 62(1), 258-263.
Available at: https://scholarworks.uni.edu/pias/vol62/iss1/29