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However, the data also show that there is a rather small difference among various metals in their selectivities, with respect to this reaction. Figure 10 indicates that there might be some difference, but with the experimental data in their present state (collected under different experimental conditions with different metals), no discussion in more detail is possible. , 1968; O'Cinneide and Clarke, 1972). Poisoning by water (Hirota and Ueda, 1964) (or poisoning accompanying sintering of films at high temperatures; Harper and Kemball, 1964; Crawford and Kemball, 1962; Phillips et alm, 1963) also affects the exchange on the ring much more than the exchange on the CH groups.

However, sometimes the changes in surface composition due to the adsorbed gas occur at rather low temperatures and in an easily detectable extent. , 1977; Van Dijk et 1976) to their surfaces when CO is adsorbed. ) the Ni atoms of the second layer become accessible to CO. , 1975; Davis and Palmberg, 1975) appeared to be a very useful tool for the determination of the surface composition of alloys. Its physical principles are such that this is 33 SELECTIVITY IN CATALYSIS a very powerful method for identifying elements.

5 p(pent) Van Sclach atm, a - 35%. 1 atm, et al Ni: 350 { Pt: a - 11%. (1969). It means that before the C-C bond can be attacked and be broken by the metal surface, some of the C-H bonds must be broken first, H atoms be removed, and the C-C bond be made accessible in this way. 8- 5% m e t a l / Si0 2 100 50 Fe Co Ni Pd Pt 250 C A05°C 295 C iso Fig. 13. isomerization, cr). , cr iso cycl Selectivity in: subgroups of cr reactions: and hydrogenolysis (cracking, (1971). The tendency to form such bonds can be tested by methane-deuterium exchange (Kemball, 1971).

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