| 摘要 |
A highly active and selective zeolitic reforming catalyst comprises a type L zeolite containing platinum metal and at least one promoter selected from iron, cobalt, titanium and the rare earth metals, the catalyst having a platinum to promoter metal mole ratio of less than 10:1. In one embodiment a type L zeolite is formed by combining an aqueous solution of potassium hydroxide, aluminum hydroxide, and ferric nitrate with an aqueous solution of silica to form a thickening gel in a mother liquor; heating the thickening gel to form a type L zeolite; cooling the gel containing the type L zeolite; decanting the mother liquor from the gel; filtering the type L zeolite from the gel; washing the filtered type L zeolite so that the pH of the wash is about 10.5 and drying the washed type L zeolite. The catalyst is formed by adding platinum to the dried type L zeolite by pore fill impregnation with an aqueous solution of Pt(NH3)4(NO3)2 to form a catalyst; drying the catalyst and then calcining the dried catalyst. |
