Abstract
The effects of alloying Cu, Fe, or Pd with a thin Ni film used to catalyze the hydrogenation of C 2H 4 have been studied. To obtain homogeneous alloy films, these were vacuum-evaporated from alloy pellets. In the absence of deliberately preadsorbed hydrogen, alloying Ni with Cu (diamagnetic) or Fe (ferromagnetic) produced only small changes in catalyst activity, however, Pd (paramagnetic) promoted the activity sharply. Deliberately preadsorbed hydrogen considerably promoted the activity of the Cu-Ni and Fe-Ni films, but not that of the Pd-Ni films. The effect of hydrogen is discussed in terms of Types A and C adsorption. Apparent activation energies ranged from 6 to 10 kcal/mole. Although the Pd-Ni catalysts were in several respects unique for all catalysts the reaction order was fractional, being positive in H 2 but negative in C 2H 4.
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