Synthesis and properties of palladium catalysts supported on n-modified carbon material sibunit in the reaction of selective hydrogenation of acetylene

The possibility of introducing nitrogen into the structure of the carbon catalyst support Sibunit by high-temperature treatment in a stream of ammonia at 800-1000°C has been studied. It has been shown that preliminary oxidation of the Sibunit surface with a 5% solution of nitric acid promotes more efficient nitrogen binding, which may be due to the presence of surface oxygen-containing groups and/or greater defectiveness of the surface of the oxidized carbon material. The depositing of palladium to Sibunit, subjected to preliminary oxidation and treatment in NH 3 at 1000°C, leads to an increase in the activity and selectivity of the Pd/Sibunit catalyst in the hydrogenation of acetylene to ethylene. It was found that the improvement in catalytic characteristics is due to an increase in the availability of supported palladium due to its localization in larger pores of the N-modified support.