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- W858475811 abstract "To develop a fluid catalytic cracking (FCC) catalyst with high gasoline yield, increased gasoline octane, and good bottom conversion, especially in processing heavier feedstock, a new process for preparing high-silica Y zeolite has been developed. The new process consists of modification of combined chemical-hydrothermal dealumination taking chemical treatment as the first step and using new reagents. The chemical treatment removes Al from the framework of the Y zeolite, and the defect sites are filled subsequently in the hydrothermal treatment. This procedure makes every step easy and controllable. A series of high-silicon Y zeolites has been prepared. These zeolites have the following characteristics: (1) arbitrarily adjustable Si/Al ratio, (2) well-distributed alumination composition, and (3) well-developed pore texture. Also, these zeolites are suitable for residue oil cracking. The preparation method involves the following steps: (1) chemical dealumination, (2) calcination under self-steam conditions, (3) chemical treatment of the calcined zeolite, (4) re-calcination under self-steam conditions, and (5) chemical treatment again to remove Al debris from the zeolite." @default.
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- W858475811 date "1993-01-01" @default.
- W858475811 modified "2023-10-17" @default.
- W858475811 title "The Preparation and Characterization of High-Silica Y Zeolite Prepared by Combined Chemical and Hydrothermal Dealumination" @default.
- W858475811 doi "https://doi.org/10.1016/s0167-2991(08)64492-4" @default.
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