Reactions between cyclopentane and deuterium on palladium and palladium-nickel alloys

Cyclopentane--deuterium exchange has been followed on pure Pd and Pd/Ni alloy films in the temperature range 200 to 430 K and at hydrogen/cyclopentane ratios of approximately 50. Conclusions on activity changes are limited because of the self-poisoning of alloys and Ni catalysts. However, the selectivity of the catalysts is much less influenced by self-poisoning; the initial product distributions are well reproducible and independent of these side processes. The main result of alloying of Pd with Ni is the gradual disappearance of one low temperature mechanism which leads on Pd to D10 products. This fact can be easily understood if we assume that it is the ''roll-over'' mechanism which is responsible for these products