Reaction of Carbon, Deposited on Supported Nickel Catalysts, with H₂O, CO₂, and H₂

Abstract

Reaction of the carbon, deposited on nickel catalysts in terms of butane decomposition, with H₂0, CO₂, and Ha was studied by using a pulse technique at 400-475°C.
In the reaction of carbon with H₂0, the amount of CO, produced was independent of the pulse size and pulse number of H₂O and of the amount of carbon deposited on the catalysts, but was proportional to the amount of catalysts. The reaction apparently was of the zero-order, with respect to both reactants. The observed activation energy was 17 kcal/mol.
In the reaction of carbon with CO₂, the activation energy was 22 kcal/mol. Significant difference was not observed between the reactivity of carbon toward H₂O and that toward CO₂.:
The reaction of carbon with H₂O or, with CO, was accelerated by the addition of K2CO₂ or Mg0 to the catalysts, but that with H₂ was decelerated.