초록 ▼

A method for enhancing the activity of a crystalline zeolite, including a zeolite having a silica-to-alumina ratio greater than 100, is disclosed which involves impregnating the zeolite with an ammoniacal aluminum fluoride solution, contacting the impregnated zeolite with a warm aqeuous solution of

A method for enhancing the activity of a crystalline zeolite, including a zeolite having a silica-to-alumina ratio greater than 100, is disclosed which involves impregnating the zeolite with an ammoniacal aluminum fluoride solution, contacting the impregnated zeolite with a warm aqeuous solution of an ammonium salt and then calcining the final product.

대표청구항 ▼

A method for enhancing the activity of a porous crystalline zeolite having a silica-to-alumina mole ratio of 70 or more which comprises impregnating the zeolite at a temperature of from about 0°C. to about 100°C. with an ammoniacal aluminum fluoride solution comprising from about 0.1 to about 5 weig

A method for enhancing the activity of a porous crystalline zeolite having a silica-to-alumina mole ratio of 70 or more which comprises impregnating the zeolite at a temperature of from about 0°C. to about 100°C. with an ammoniacal aluminum fluoride solution comprising from about 0.1 to about 5 weight percent of an aluminum fluoride in solution with at least one member selected from the group consisting of ammonium hydroxide and ammonia, contacting the impregnated zeolite with a warm aqueous 0.1 to 2 Normal solution of an ammonium salt, and calcining the ammonium salt solution contacted material at a temperature of from about 200°C. to about 600°C. The method of claim 1 wherein said zeolite has a silica-to-alumina mole ratio greater than about 500. The method of claim 1 wherein said zeolite is ZSM-5, ZSM-11, ZSM-12, ZSM-23, ZSM-35, ZSM-38 or ZSM-48.