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

By W G Frankenberg

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Mills, G. , and Oblad, A. Discussion 8,279 (1950). 40. , Znd. Eng. Chem. 41, 1485 (1949). 41. Mills, G. , and Hindin, S. , J . Am. Chem. 72, 5549 (1950). 42. Hansford, R. , Znd. Eng. Chem. 39, 849 (1947). 43. Hansford, R. , Waldo, P. , Drake, L. , and Honig, R. E, Joint Symposium on Use of Isotopes in Petroleum Chemistry, 118th. Meeting American Chemical Society, Chicago, September 1950 (see preprint of syniposiurn papers, p. 81). 44. Hindin, S. , Mills, G. , and Oblad, A. , J . Am. Chem. 73, 278 (1951) (Paper presented a t same symposium indicated in reference 43).

Thus, the acidity of the catalyst becomes a function of the basicity of the material used to measure it. Although this concept of the acid nature of cracking catalysts is novel and has some interesting aspects, it is completely unacceptable to this writer. First of all, the proponents of the concept have ignored a very considerable body of evidence that protons can and do exist on cracking catalysts at temperatures above which it is contended that a Bronsted acid cannot exist. , HzO, could exert an effect on the structure of a solid such as is postulated.

HzO + HzOr HOZ + HzO 0 2 4 in which the hydroxyl radical takes part. With such presumably highly reactive entitites it can be supposed that these reactions are fast, and hence long chains are possible. This idea of reaction in single electron transfer steps was extended by Haber and Weiss (4) to the oxidation by hydrogen peroxide. I n this case the hydroxyl radical may be formed as follows : A++ + H202-+ A+++ + OH’ + HO. and this may then take part in the above chain reaction. The combination of these steps results in catalytic decomposition and involves the compensating reaction principle.

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