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Studies have been made of the kinetics of the hydrogenation of mixtures containing 2 % of acetylene in ethylene on an alumina supported palladium catalyst in a static system. Information ' A. Farkas and L. Farkas,

Reversible results for the adsorption of benzene, toluene and n-heptane vapours on mercuryhave been obtained. The films were found to be gaseous and obeyed the Volmer equation A number of phase changes were found to occur after the completion of monolayer adsorp tion, the m ost striking being interpreted as the change over from 'fla t' to 'v ertica l' adsorp tion of the toluene m olecules. Others were thought to be either two-dimensional condensa tion or adsorption of a second layer.Much of the published work on the surface tension of mercury in the presence of vapours is qualitative rather than quantitative, and in some cases grave doubts arise as to the purity of the mercury used. The present investigation was under taken with the intention of throwing further light upon the following points:(1) The determination of quantitative energies of adsorption of simple molecules on mercury to give the magnitude of the van der Waals or exchange forces involved.(2) The nature of the monolayer films formed on mercury. (3) The conditions governing the formation of multilayers or lenses on mercury, which is an ideal medium for examining changes at vapour pressures approaching the saturation value, because of the homogeneity of the surface and the absence of capillaries.Iredale (1923, 1924 and 1925) described the adsorption of a number of vapours. He found th a t the adsorption was largely reversible except in the case of methyl iodide. Unfortunately, as pointed out by Burdon (1932), the sessile drop used was not of sufficient size to justify the application of the Worthington (1885) equation to calculate the surface tension, but by chance the errors approximately cancelled.on May 10, 2018 http://rspa.royalsocietypublishing.org/ Downloaded from

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Original sample of gasoline 0.7349 2.002 2.012 0.010 Boiling fraction: 60-90 .6782 1.909 1.909 0 90-100 .6933 1.937 1.937 0 100-120 .7164 1.960 1.960 0 120-140 .7257 1.987 1.990 0.007 140-160 .7449 2.008 2.021 .013 160-180 .7619 2.033 2.050 .017 Above 180 .7910 2.074 2.097 .023that the highest boiling fraction has relatively the highest dipole moment of all fractions, namely, 0.31 X 10 ~18. Benzene and carbon tetrachloride have frequently been used as non-polar solvents in dipole moment determinations. The difference in m2d and E for benzene and carbon tetrachloride at 25°a re, however, 0.037 and 0.114, respectively.According to this criterion, gasoline should be more non-polar than benzene or carbon tetrachloride.Table III lists the dipole moment values which have been obtained using gasoline and similar solvents of indefinite molecular weights and the values obtained for the same compounds using solvents of known molecular weights. Dipole Moment at 25 °* Castor oil Tung oil Di-n-butyl ether Ethyl-M-butyl ether Acetone gasoline 2.8 Chloroform gasoline 1.16 Acetonitrile gasoline 3.33 kerosene 3.35 petroleum ether 3.35 • The values for castor oil and tung oil are taken from Li,