| 摘要 |
PURPOSE:To enhance metal resistance, by drying a mixture consisting of zeolite and alumina/magnesia and subsequently washing the same with a weak acidic aqueous solution with pH 2-6 containing ammonium salt or/and salt of a rare earth element. CONSTITUTION:3-40wt% of crystalline aluminosilicate zeolite and 60-97wt% of alumina/magnesia are mixed and, after the resulting mixture was dried or dried and baked, said mixture is washed with a weak acidic aqueous solution of ammonium salt with pH 2-6, a weak acidic aqueous solution of salt of a rare earth element with pH 2-6 or a mixture thereof to prepare a hydrocarbon converting catalyst. The aforementioned washing is performed by such a method that the mixture of zeolite and alumina/magnesia is immersed in the aforementioned aqueous solution at 0-100 deg.C, pref., at 25-70 deg.C for 10min-5 hr under stirring or the aforementioned aqueous solution is flowed through the dried and baked mixture consisting of zeolite and alumina/magnesia.
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