Advances in Catalysis, Vol. 7 by W.G. Frankenburg, V.I. Komarewsky, E.K. Rideal (Eds.)

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

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11. Catalytic activity as a function of per cent d-character (Beeck). catalyst activity. The catalysts used, in order of decreasing activity, are Pd > Pt > Nil Rh > Fe, Cu, Co, I r > Rh, 0s. It can be seen that rubidium and osmium which have the highest percentage d-character and should exhibit high catalytic activity, have been observed to have a very low activity. There is, however, in this case a parallelism between catalyst ELECTRONIC FACTOR IN HETEROGENEOUS CATALYSIS 23 activity and magnetic susceptibility as emphasized by Maxted (Table VI), which reflects an undoubted influence of some parameters of electronic structure of the metals on their catalytic activities.

States, however, that it would be unwise to ignore crystal parameter considerations for reactions involving adsorption of reactants on two or more sites. 11. Catalytic activity as a function of per cent d-character (Beeck). catalyst activity. The catalysts used, in order of decreasing activity, are Pd > Pt > Nil Rh > Fe, Cu, Co, I r > Rh, 0s. It can be seen that rubidium and osmium which have the highest percentage d-character and should exhibit high catalytic activity, have been observed to have a very low activity.

Mod. Phys. 17, 61 (1945). 36. Trapnell, B. M. , Trans. 48, 160 (1952). 37. Allen, J. A,, and Mitchell, J. No. 8, 361 (1950). 38. , Smith, A. , Proc. Roy. A177, 62 (1940). 39. Manning, 111. , and Krutter, H. , Phys. Rev. 61, 761 (1937). 40. Herington, E. F. , and Rideal, E. , Trans. 40, 505 (1944). 41. Maxted, E. , Advances in Catalysis. 3, 129 (1951). 42. Dilke, M. , Eley, D. , and Maxted, E. , Nature 161, 804 (1948). 43. Maxted, E. , J . Chem. p. 1987 (1949). 44. , J. Am. Chem. 72, 1040 (1950).

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