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Advances in Catalysis and Related Subjects, Volume 4 by W G Frankenberg

By W G Frankenberg

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11. Halides and Halogens.. . . . . . . . . . . . . . . . . . . . . . . Paw 31 35 1. , . . . . . . . . . . . 2. Reduction of Halogens by Hydrogen Peroxide.. . . . . . . . . . . 3. The Steady State . . . . . . . . . . . . . . . . . . . . . . . . 36 37 37 ..................... 43 2. Active Intermediates. . . . . . . . . . . . . . . . . . . . . . . . . 62 VI.

And Rescorla, A. , Oil Gas J. 46, No. 28, 231 (1947). 20. Mills, I. , Oil Gas J. 46, No. 28, 237 (1947); Proc. Am. Petroleum Inst. 27 [III], 29 (1947). 21. , and Shimp, H. , Natl. Petroleum News 36, No. , Proc. Am. Petroleum Znst. 27 [III],51 (1947). 22. Birkhimer, E. , Macuga, S. , and Leum, L. , Proc. Am. Petroleum Znst. 27 [111], 90 (1947). 23. Shankland, R. , and Schmitkons, G. , Proc. Am. Petroleum Znst. 27 [111], 57 (1947). 24. Conn, M. , and Connolly, G. , Znd. Eng. Chem. 39, 1138 (1947).

Subsequent work by Liebhafsky (31) showed that provided the iodine was removed as it forms, the iodate can be almost quantitatively reduced to iodine according t o the equation: 2103’ + 5HZO2+ 2H++ Iz + 6Hz0 + 5 0 2 (1) On the other hand, in acid solution iodine is slowly oxidized to iodate by hydrogen peroxide. The oxidation can be speeded up considerably by high acidities and also by the addition of iodate. I n these circumstances the reaction can be made to go quickly and almost quantitatively according to the equation Iz + 5H202 -+ 2103 + 2Hf + 4H20 (11) Reactions I and I1 occurring together will obviously lead to a catalytic decomposition of hydrogen peroxide similar in principle t o the halidehalogen catalysis.

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