| 简介 |
PROBLEM TO BE SOLVED : To provide a catalyst for efficiently decreasing the sulfur content in a gasoline base material to ≤50 mass ppm when the gasoline base material is produced by catalytically cracking heavy oil or heavy gas oil in a FCC plant and to provide a method of manufacturing the catalyst and a method of producing low-sulfur catalytically-cracked gasoline efficiently by using the catalyst. ŽSOLUTION : The method of manufacturing the fluid catalytic cracking catalyst having a desulfurizing function comprises the steps of : depositing a rare earth element on a carrier which contains 2-40 mass% alumina, 2-40 mass% silica, 5-50 mass% zeolite and 5-50 mass% clay mineral, by an ion exchange method or an impregnation method; drying the rare earth element-deposited carrier; impregnating the resulting carrier with at least one metal selected from the group consisting of vanadium, zinc and manganese and depositing the selected metal(s) to the resulting carrier; and drying the metal-deposited carrier. Each of the drying steps satisfies the following conditions : (a) the drying temperature is within 60-300°C; (b) the drying time is within 30-120 minutes; and (c) the time to expose to a temperature of ≥200°C is within 10 minutes. ŽCOPYRIGHT : (C)2007, JPO&INPIT Ž |
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