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Published online by Cambridge University Press: 24 October 2008
The velocity of bimolecular reaction at a catalyst surface is often proportional to the concentration of either reactant when this is small, but at greater concentrations the rate of reaction falls off considerably, and finally the increase of concentration may actually retard the reaction. The maximum reaction velocity does not occur in general when the partial pressures of the reactants are in the ratios suggested by the chemical equation of reaction.
* Die Eigenschaften des Adsorptionsvolumens, Zurich and Leipzig, Gebr. Leeman and Co. 1916, p. 40.Google Scholar
† Muller, W., Ber. 3, 84 (1870).CrossRefGoogle Scholar
* Zeit. für phys. Chem. 16, 315 (1895). There are now known many cases of this phenomenon of displacement.Google Scholar
* Now expressed as the number of molecules per unit area of the surface, the precise meaning of the term ‘surface’ being reserved for discussion in a later paper. The meaning and magnitude of the surface of an active catalyst can vary markedly according to the definition adopted.Google Scholar
* cf. J. Amer. Chem. Soc. vol. 38, p. 221 (1916) et seq.CrossRefGoogle Scholar Summarised Trans. Farad. Soc. 17, 621 (1921).Google Scholar
* Other cases were not excluded, but the relations obtained are not easy to test experimentally.Google Scholar
* The temperature coefficient may even become negative; cf. Grassi, Nuovo Cimento, vol. 11, pp. 147–63;CrossRefGoogle ScholarPease, , J. Amer. Chem. Soc. vol. 45, p. 1196 (1923);CrossRefGoogle Scholar Pease and Purdum, ibid. vol. 47, p. 1435 (1925).