초록 ▼

New catalyst compositions of superior hydrothermal stability, which evidence increased gasoline plus distillate yields, improved coke selectivity and reduced C4-gas yields, are based on framework dealuminated faujasitic zeolites having a framework silica to alumina molar ratio of from about 5 to 100

New catalyst compositions of superior hydrothermal stability, which evidence increased gasoline plus distillate yields, improved coke selectivity and reduced C4-gas yields, are based on framework dealuminated faujasitic zeolites having a framework silica to alumina molar ratio of from about 5 to 100. In a preferred embodiment, an “ultrastable Y”composited with a matrix, is subjected to a treatment with a source of aluminum and rare earth compounds followed by hydrothermal treatments to improve the hydrothermal stability and selectivity of the catalyst for catalytic cracking. This is evidenced by higher gasoline plus distillate yields and lower coke and gas production at lower catalyst useage per barrel of feed relative to commercial cracking catalysts currently being used.

대표청구항 ▼

A catalyst composition comprising 1 to 60 weight percent framework dealuminated Y zeolite, based on the total weight of the composition; 40 to 99 weight percent of a matrix, based on the total weight of said composition; 0.01 to 15 weight percent alumina incorporated into said catalyst composition v

A catalyst composition comprising 1 to 60 weight percent framework dealuminated Y zeolite, based on the total weight of the composition; 40 to 99 weight percent of a matrix, based on the total weight of said composition; 0.01 to 15 weight percent alumina incorporated into said catalyst composition via ion exchange based on the total weight of said composition; 0.01 to 10 weight percent rare earth, expressed as the oxides of same, based on the total weight of said composition, dispersed, exchanged, impregnated or deposited in a composite of said zeolite and said matrix.