Hydrogenation of Nitro Compounds over Catalytic Systems Containing Rare-Earth Oxides

摘要

The paper studies the activity of 1 % palladium catalysts containing rare earth oxides (REOs) and alumina as a carrier in the hydrogenation of nitro compounds exemplified by nitrobenzene and o-nitro anisole. Under the liquid-phase hydrogenation conditions, these catalytic systems provide high selectivity of the process and a quantitative yield. It has been found that the partial replacement of Al_2O_3 with REO allows increasing the hydrogenation rate by 5-6 times, as compared with the reference catalyst and by 1.2-1.7 times as compared with the individual carrier. The oxide mixtures (REO and Al_2O_3) containing 20-40 % REO allow reaching the same hydrogenation rate with that over an REO-containing 1 % Pd catalyst.