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The larger pore LaY zeolite catalyst resembles homogeneous metal chloride and heterogeneous silica‐alumina acid catalysts since the results are consistent with isomerization being a series of intramolecular 1,2 shifts. On the other hand, isomerization with the smaller pore zeolite, ZSM‐5, is very different and the relative rate constants appear to be influenced by diffusion and/or shape selectivity. Disproportionation is a significant reaction with LaY but not with ZSM‐5 in the temperature range used for the present study. The small amount of trimethylbenzene formed at low conversions using ZSM‐5 is 1,2,4‐trimethylbenzene, also providing evidence of shape selectivity influencing the reaction products.

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Nickel boride, unlike Raney nickel, does not produce appreciable concentrations of reaction intermediates during the liquid phase hydrogenation of nitrobenzene. The formation of aniline and the disappearance of nitrobenzene follow zero-order kinetics. The reaction appears to be second, or higher, order in hydrogen pressure. While nickel boride, for similar amounts of catalyst, is somewhat less active than Raney nickel, it does have the advantage of producing aniline free of intermediates throughout the course of the reaction.