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The pre-eminence of A1203 as a support for Rh in this reaction is shown by another recent paper,45 although here the authors relate activity to the catalysts' various abilities to form reactive surface C. The same kind of support effect is showna in the steam dealkylation of toluene catalysed by Rh (see Table 4), although significantly not in its hydrogenolysis. ' whose rates and activation energies were however somewhat higher. 23 x i 0 5 -l R. Nakamura, S. Nakai, K. Sugiyama, and E. Echigoya, Bull.

Gleason, and S. McMillan, Faraday Discussion, Nottingham, 1 9 8 1 , paper 7 2 / 8 . F. Fajual, K. G. Anthony, and J . H. Lunsford, J. , 1 9 8 2 , 7 3 , 2 3 7 . G. C. Bond, in ref. 2 0 , p. 1 . G. -A. Martin and J . A. Dalmon, React. Kinet. Cutul. , 1 9 8 1 , 16, 3 2 5 ; J. , 1 9 8 2 , 7 5 , 233; H Praliaud and G. -A. , 1 9 8 1 , 7 2 , 394. G. -A. Martin, R. Dutartre, and J . A. Dalmon, React. Kiner. Cutul. , 1 9 8 1 , 16, 3 2 9 . 36 Gz talysis Desirable as it would be to have some reference system in which the metalsupport interaction could be taken as non-existent, this may be too much to hope for.

It is assumed that there is free exchange between the O2 on the perimeter and the O2 inside the islands, and the rate of exchange is directly proportional to their respective concentrations. 12 Oxidation of CO/But-1e n e Mixtures If but-1-ene is also assumed t o compete for the same type of active sites before being completely oxidized to C 0 2 and H 2 0 , then the extra steps necessary in addition t o steps 1 and l(a) are given in equation (10). k4 C4Hg+2S C4Hg-2S k-'l C4Hg-2S + 120-S 4 4CO2 + 4H2O + 1 4 s But-1-ene is assumed to occupy two Pt sites and it is also found to be adsorbed on the A1203support.

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Catalysis [Splst Period'l Rpt Vol 06] by G. Bond, et al.,


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