Selective nickel based hydrogenation catalyst and the preparation thereof

摘要

A selective nickel-based hydrogenation catalyst and the preparation thereof, characterized in that: provided that the catalyst is weighed 100%, it comprises nickel oxide 14-20% as active component, lanthanum oxide and/or cerium oxide 2-8%, and VIB element oxide 1-8% as aids, 2-8% silica, 1-8% alkaline earth metal oxides, and alumina as the balance. The catalyst specific surface area is 60-150 m2/g, and the pore volume is 0.4-0.6 ml/g. The catalyst has good hydrogenation performance, especially impurity and colloid resistance and hydrogenation stability. The catalyst can be applied to the diolefin selective hydrogenation of medium or low-distillate oil, especially of the full-distillates pyrolysis gasoline.

主权项

1. A method for preparing a selective nickel-based hydrogenation catalyst, the method comprising:
adding silica or its precursor and alkaline earth metal oxide or its precursor into an alumina carrier so as to form a first mixture; calcinating the first mixture at the temperature of 800-1100° C. for 3-6 hours to form a modified alumina carrier; adding soluble salts of nickel, rare earth element and VIB group element into water so as to form a solution; adjusting the pH of the solution to 4-5 following full dissolution of the soluble salts to form an impregnating solution; impregnating the modified alumina carrier with the impregnating solution to form a second mixture; after impregnating, drying the second mixture at the temperature of 40-120° C.; and after drying, calcinating the second mixture at the temperature of 350-450° C. for 3-6 hours, thereby obtaining the resultant catalyst, wherein the modified alumina carrier is prepared by: adding silica sol, nitric acid and water into alumina hydrate so as to form a third mixture; after kneading and extruding the third mixture, drying the third mixture at the temperature of 40-120° C.; after drying, calcinating the third mixture at the temperature of 300-600° C. for 4-6 hours so as to form a carrier; impregnating the carrier with an impregnating solution formed by adding alkaline earth metal oxide into water; after impregnating, drying the carrier at the temperature of 40-120° C.; and after drying, calcinating the carrier at the temperature of 800-1100° C. for 4-6 hours, thereby forming the modified alumina carrier.