Abstract
In Part I of this series [W. Juszczyk et al., in “Proceedings, 9th International Congress on Catalysis, Calgary 1988” M. J. Phillips and M. Ternan, Eds., Vol. 3, p. 1238. The Chemical Institute of Canada, Ottawa 1988 using the catalytic conversion of neopentane as a virtually noncoking probe, we found that after reduction at moderate temperatures (573–773 K), Pd Al 2O 3 is roughly two orders of magnitude more active than Pd SiO 2 . An even higher, though transient, catalytic activity is now reported after reducing Pd Al 2O 3 at 873 K and extensively purging it in He at this temperature. The IR spectra of adsorbed CO reveal the presence of Pd n+ ions in superactive Pd Al 2O 3 ; their concentration positively correlates with catalytic activity. Since other potential causes such as strong acid sites are excluded, it is proposed that Pd n+ ions are sites of high catalytic activity. A possible mechanism of their formation and a model of neopentane hydrogenolysis are briefly discussed. Completely reduced Pd appears necessary for neopentane isomerization.
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