A comparison of nickel and rhodium catalysts for the reforming of methane by carbon dioxide

摘要

The reforming reaction between CH_4 and CO_2 over Ni/Al_2O_3 at 700 deg C has been found to show a deuterium kinetic isotope effect and a pattern of kinetic orders which depends on the reactant ratio. It appears that methane activation is rate limiting when CO_2 is in excess but that removal of carbonaceous matter may become rate determining when there is excess CH_4. With Rh/Al_2O_3 the adsorption of methane is partially reversible, the kinetic isotope effect has an intermediate value and removal of deposited matter is rapid.