Process for preparing selective hydrogenation catalyst with palladium

摘要

The process for preparing selective hydrogenation catalyst with palladium according to the resent invention is characterized in that first, there is prepared an impregnation solution containing 3 to 50 g/l of palladium dichloride by dissolving the palladium dichloride in HCl, by which hydrotalcite is impregnated at a temperature in the range of 40 to 70 degC. Subsequently, solvent evaporates from the impregnated hydrotalcite under reduced or atmospheric pressure at a temperature in the range of 35 to 80 degC; palladium dichloride reduces to palladium by the solution of formaldehyde with concentration in the range of 30 to 50 percent by weight of and at a temperature in the range of 20 to 50 degC. The impregnated hydrotalcite is then dried at a temperature in the range of 80 to 120 degC, calcined in air at a temperature in the range of 400 to 650 degC with the heating rate of 0.5 to 3 degC/min and reduces by hydrogen at a temperature in the range of 350 to 450 degC with the heating rate of 0.5 to 3 degC/min immediately prior use in a hydrogenation reaction.