Patent ID: 6017840
Filing Date: 2000-01-25
Classification: B01J,C10G

Abstract:
A process consisting essentially of:(1) contacting a beta zeolite with steam at a temperature in the range of from about 200.degree. C. to about 1000.degree. to produce a steamed beta zeolite;(2) contacting said steamed beta zeolite with an aqueous solution containing an acid at a pH lower than about 6, at a temperature in the range of from about 30 to about 200.degree. C., under about 1 to about 10 atm pressure, and for a period of from about 10 minutes to about 30 hours to produce an acid-leached Beta zeolite;(3) contacting said acid-leached beta zeolite with a metal compound thereby producing a metal-promoted beta zeolite by a method chosen from incorporating said metal into said acid-leached beta zeolite or impregnating said acid-leached beta zeolite with said metal;(4) calcining said metal -promoted beta zeolite wherein the metal of said compound is selected from the group consisting of nickel, palladium, molybdenum, gallium, platinum, tungsten, tin, indium, chromium, rhodium, rhenium, cobalt, germanium, zirconium, titanium, ruthenium, and combinations of any two or more thereof and said acid is selected from the group consisting of sulfuric acid, hydrochloric acid, nitric acid, phosphoric acid, formic acid, acetic acid, trifluoroacetic acid, trichloroacetic acid, p-toluenesulfonic acid, methanesulfonic acid, partially neutralized acids, and combinations of any two or more thereof.