Palladium-based catalyst for selective hydrogenation of acetylene

摘要

The present invention describes a Pd-catalyst, further consisting of La, Ti, Nb, K or Si, which have high ethylene selectivity even after a low temperature reduction in the selective hydrogenation of acetylene to ethylene and the production method of the same. A catalyst of the invention consists essentially of 0.05 to 2.0% by weight, based on the supported catalyst, of palladium and one or two metals chosen form the group consisting of lanthanum, niobium, titanium, potassium and silicon. The said catalyst is prepared by the following procedure. (1) Impregnating a support in aqueous solution of tetra amine palladium hydroxide, followed by drying and calcination; (2) The second and, if necessary, a third metal is impregnated by impregnating the Pd-catalyst in the solution of the metal precursor followed by drying and calcination; (3) The catalyst according to step (2) is then reduced in hydrogen at 200°C to 600°C for 1 to 5 hours.