Abstract
The para-ortho hydrogen conversion was studied with both powdered and pelleted nickel/alumina catalysts in a continuous-flow system in the range 25–65 °C and 0.15–0.95 atm. Results were compared with kinetic models developed by the steady state method using several postulated mechanisms. The observed reaction kinetics were consistent with a number of mechanisms, and the overall kinetics with the pellets were consistent with a simple pore-diffusion model. Activation energies for five powder catalysts fell in the unusually wide range of 1.6 to 10.4 kcal/mole and showed a compensation effect.
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