Hydrogenation of carbon dioxide to methane in the presence of a supported catalyst based on a ruthenium complex with trioctylamine

A catalyst based on the ruthenium-trioctylamine complex supported on alumin a was first used in selective hydrogenation of carbon dioxide to methane. T he reaction was studied by the pulse method in a KL-2 apparatus at atmosphe ric pressure in a hydrogen flow. Optimum hydrogenation conditions were dete rmined. The hydrogenation reaction proceeds in the kinetic region at all of the space velocities examined over the temperature range 400-500 K, but pa sses into the internal-diffusion region at temperatures higher than 500 K. Activation energies were calculated for the kinetic region. The activity of the metal complex catalyst was shown to be much higher than that of the ca talyst obtained from the original salt. A possible mechanism of CO2 methana tion is discussed.