Abstract
Nickel-zeolite Y of various parent cation types, NiNa-A and NiNa-M were prepared. The reducibilities of nickel ions in these zeolites were evaluated by hydrogen consumption measurement. The nickel ions were reduced markedly by hydrogen in NiCa-Y, NiSr-Y and NiBa-Y in contrast to that of NiNa-Y, whereas the degrees of nickel reduction in NiH-Y and NiH-M were slight. It was assumed that the reducibilities were mainly affected by both the occupying sites of nickel ions and the acidic hydroxyl groups in zeolites.
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