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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003% permanganate in N/100 HzSOd. from the aqueous phase by a layer of hydrocarbon. As predicted the rate found is now very small (Fig. 9). It is important to notice that the double bonds and the permanganate are separated by a layer of hydrocarbon only about 10 A. thick, which, because of the orientation of the monolayer, the permanganate ions cannot break through. Such protection by extremely thin barriers is of obvious importance in fields as far apart as corrosion and biology. 10. Cis double bonds never pack perfectly, but trans compounds fit closely together.

Clectrical charge. This repels the similarly charged hydrolytic hydroxyl ions. 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.

11 and 12). Similar 22 J. T. DAVIES comparisons are presented in Tables V and VI. 11. Orientation of ethyl palmitate molecules in a compressed monolayer. The ethyl groups are pushed below the surface, forming a protective sheath below the ester linkages. -' (Alexander and Schulman, 18). 12. Ethyl palmitate films when the molecules are nearly independent. 037 m k - 1 (Alexander and Schulman, 18). actual rates of the reactions at room temperature are still fairly close. Why should this be so? The clue lies in the fact that the energies of activation, measured in this way a t constant film pressure, are, in the different cases, always about 5000 cal.

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