Formation of NiWO4 and its effects on hydrogenation activity of Ni-W/Al2O3 catalysts

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Rhodium supported on NaY and NaH(x)Y zeolites with variable proton exchange (x= 10-30% eq.) have been used used for benzene hydrogenation and for the hydrogenolysis of n-butane. The catalysts containing 2 wt.-% rhodium showed differences in metal reducibility, metal dispersion, metal location into the zeolite and catalytic activity. All the data reported suggest that the differences in catalytic performance of the partially exchanged Rh/NaH(x)Y zeolites can be explained in terms of electron deficient rhodium clusters generated upon hydrogen reduction.