Abstract
A series of nickel-zeolite catalysts with alkaline earth, lanthanum and hydrogen ions as parent-cations in zeolite Y were prepared. The degrees of nickel ion reduction and the dispersion states of reduced nickel were affected by the extent of nickel-exchange and by the types of parent-cations in zeolites. Zeolite catalysts with nickel in higher dispersion state have been prepared on reduction of NiCa-Y, NiSr-Y and NiBa-Y with hydrogen. The activity of benzene hydrogenation was proportional to the dispersion of reduced nickel on zeolites.
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