Download Advances in Catalysis, Vol. 6 by W.G. Frankenburg, V.I. Komarewsky, E.K. Rideal (Eds.) PDF

By W.G. Frankenburg, V.I. Komarewsky, E.K. Rideal (Eds.)

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Extra resources for Advances in Catalysis, Vol. 6

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1 40 cc. 1 40 cc. 1 10 cc. 80 cc. 0 75 cc. 0 30 cc. 20 cc. 0 10 cc. 00 re 0 00 rc. alcohol chains cause some inhibition within the range of lengths of acid radicals leading to digestion. Schulman explained these results by suggesting that the easily digested substances, such as ethyl butyrate, are oriented a t the surface of the drops in just the same may as are esters with longer chains a t the airwater interface, when the film pressure is low. T h a t is to say that there is free access of molecules in the aqueous phase to the ester groups, as in Fig.

The height of this electrical repulsive barrier is reduced greatly by any “neutral” salts (Davies and Rideal, 21). Hartley and Roe (50) in this way were able to calculate the p H of the surface. This is related to the electrical potential, $, of the surface by: pH, = pH6 + efilkT (xxi) where k is the Boltzmann constant and T the absolute temperature. The potential a t a distant point in the bulk of the solution is conventionally set a t zero. Another method of finding $ is from measurements of the surface potential, AV.

The findings of the Russian workers on polymerization in the surface are discussed in detail in Section VII. CATALYSIS AND REACTION KINETICS AT LIQUID INTERFACES 31' 6. Lactonization of y-Hydroxystearic Acid If a monolayer of y-liydroxystearic acid is spread on an acid substrate, a reaction occurs with the formation of y-stearolactone. This particular conversion is of interest for two reasons; it offers an example of a reaction between two groups both held in the film, and it provides an excellent test for a mathematical theory of surface reactions, as we shall see below.

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