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On the present position of the Theory of Centres of Activity in Heterogeneous Catalysis

Published online by Cambridge University Press:  24 October 2008

F. Hurn Constable
F. Hurn Constable
Affiliation:
Fellow of St John's College
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Extract

The great increase in the speed of chemical change at the surfaces of specific substances has always been one of the most mysterious of all chemical phenomena, and the collection of evidence which will throw light on the nature of the process is research which lies at the foundation of chemical science, because it concerns the ultimate nature of chemical combination and dissociation.

Type
Research Article
Information
Mathematical Proceedings of the Cambridge Philosophical Society , Volume 24 , Issue 2 , April 1928 , pp. 291 - 306
Copyright
Copyright © Cambridge Philosophical Society 1928

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References

* Treated more fully later.Google Scholar

* See succession of papers commencing J. Amer. Chem. Soc., vol. 45, p. 1196 (1923).CrossRefGoogle Scholar

* The fall in catalytic activity due to heat treatment.Google Scholar

† J. Amer. Chem. Soc., vol. 47, p. 1235 (1926).Google Scholar

‡ Cf. Constable, , Proc. Camb. Phil. Soc., vol. 23, p. 832 (1927).CrossRefGoogle Scholar

§ J. Phys. Chem., vol. 30, p. 1543 (1926).Google Scholar

* Taylor, and Burns, , J. Amer. Chem. Soc., vol. 43, p. 1273 (1921).CrossRefGoogle Scholar

† Gauger and Taylor, ibid., vol. 45, p. 920 (1923).

‡ Benton, ibid., vol. 45, pp. 887, 900 (1923).

§ Pease, , loc. cit.Google Scholar

‖ There seems to be little direct evidence that the films are unimolecular.Google Scholar

Constable, , Proc. Roy. Soc. A, vol. 110, p. 352 (1926).CrossRefGoogle Scholar

* This condition is necessary in order that catalyst poisons produced in the thermal decomposition should be swept away.Google Scholar

† A succession of papers which have added much to our knowledge, e.g. Adkins, and Nissen, , J. Amer. Chem. Soc., vol. 45, p. 809 (1923).CrossRefGoogle Scholar

‡ Taylor, , Proc. Roy. Soc. A, vol. 108, p. 105 (1925); vol. 113, p. 77 (1926).CrossRefGoogle Scholar

* Proc. Roy. Soc. A, vol. 108, p. 111 (1925).CrossRefGoogle Scholar

† X-ray analysis shows that in the main the crystal structure is preserved, and promotors increase the exposed surface (e.g. Wyckoff, and Crittenden, , J. Amer. Chem. Soc., vol. 47, p. 2286 (1925))Google Scholar. The poisoning measurements were made by Almquist, and Black, , J. Amer Chem. Soc., vol. 48, p. 2814 (1926)CrossRefGoogle Scholar, and the deductions from affinity considerations by Almquist, ibid., idem; Pease and Cook have also made similar observations in studying the equilibrium of the reaction

that the yield of hydrogen when steam is passed over reduced nickel is greatly in excess of the equilibrium value that is attained when the reaction has proceeded for some time. Nickel thus manifests the same phenomenon as does iron.

‡ J. Amer. Chem. Soc. vol. 46, pp. 888–903 (1924).CrossRefGoogle Scholar

* A frozen grouping of atoms with strong specific external fields.Google Scholar

† Proc. Roy. Soc. A, vol. 113, p. 77 (1926).CrossRefGoogle Scholar

* Gazzetta, vol. 56, pp. 425–429 (1926).Google Scholar

† Atti R. Accad. Lincei, 1926, VI, pp. 3, 91–97 (1926).Google Scholar

‡ Proc. Roy. Soc. A, vol. 111, p. 210 (1926).CrossRefGoogle Scholar

§ Constable, , Nature, vol. 118, p. 730 (1926); vol. 119, p. 349 (1927); vol. 120, p. 769;CrossRefGoogle ScholarJ. Chem. Soc., vol. 127, p. 1578 (1927).Google Scholar

* See Almquist, (loc. cit.);Google ScholarTaylor, (loc. cit.);Google ScholarConstable, , Proc. Roy. Soc. A, vol. 108, p. 355 (1925), on the “Mechanism of Catalytic Decomposition.”CrossRefGoogle Scholar

† See series of papers by Author in Proc. Camb. Phil. Soc. 1925–1927.Google Scholar

* The active centre may also adsorb unreactive substances, or may be left completely free from adsorbed molecules. It is the fraction of a time interval t that the centre is occupied that measures the probability of a unimolecular reaction. The additional condition that an adjacent centre shall hold a reactant molecule is necessary for bimolecular reaction.Google Scholar

† See following paper, “A method of generalising the Law of Mass Action for Heterogeneous Surface Reactions.”Google Scholar

‡ Zeit. für Phys. vol. 26, p. 123 (1924).Google Scholar

* Proc. Roy. Soc. A, vol. 108, p. 355 (1925).CrossRefGoogle Scholar

* See following paper.Google Scholar

† See succession of papers, J. Chem. Soc.Google Scholar and Proc. Roy. Soc., 1920–1926.Google Scholar

‡ J. Amer. Chem. Soc., vol. 47, p. 1435 (1926).Google Scholar

* J. Amer. Chem. Soc., vol. 38, p. 2286 (1916).Google Scholar

† Nature, vol. 115, p. 674.CrossRefGoogle Scholar

‡ J. de Phys., vol. 4, p. 324 (1923).Google Scholar

* Proc. Roy. Soc. A, vol. 108, p. 27 (1925).Google Scholar

† Nature, vol. 115, p. 269.Google Scholar