Claims
- 1. A process for modifying a zeolite, which comprises:
- treating the zeolite with an aqueous medium having a pH greater than 10;
- removing a portion of said medium from the surface of said zeolite leaving residual adherent medium on said zeolite; and
- calcining said zeolite which contains adherent aqueous medium having a pH greater than 10 at a temperature between about 500.degree. C. and about 650.degree. C. for between about 6 and about 12 hours.
- 2. A process for modifying a zeolite which comprises:
- treating said zeolite with an alkaline aqueous medium having a pH between about pH 10 and about pH 13;
- filtering said zeolite to remove the excess of said alkaline medium from the surface of said zeolite but to leave a portion of said alkaline medium adherent to said zeolite; and
- calcining said zeolite which contains said adherent medium at a temperature between about 500.degree. C and about 650.degree. C. for between about 6 and about 12 hours.
- 3. A method for making a zeolite which comprises:
- mixing a solution containing an aluminum compound and a water glass solution in amounts effective for the formation of zeolites with a SiO.sub.2 : A1.sub.2 O.sub.3 ratio between 20 and 150;
- heating said mixed solution at a temperature below 80.degree. C. for between about 0.25 and about 5 hours to form a first gel;
- heating said first gel to a temperature greater than 80.degree. C. and adding a mineral acid to said first gel while stirring said first gel for between about 0.1 and 3 hours to form a second gel, said added mineral acid being between about 10 and 60% by weight of said first gel;
- autoclaving said second gel at a temperature of between about 50.degree. C. and 350.degree. C. to form a crystallized gel;
- filtering said crystallized gel to obtain a pentasil zeolite;
- treating said zeolite with an aqueous medium having a pH greater than 10;
- filtering said zeolite to remove excess aqueous medium but to leave alkaline aqueous medium adhering to said zeolite; and
- calcining said zeolite which contains said adherent medium at a temperature between about 500.degree. C. and about 650.degree. C. for between about 6 and about 12 hours.
Priority Claims (1)
Number |
Date |
Country |
Kind |
3806932 |
Mar 1988 |
DEX |
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Parent Case Info
This is a continuation of prior application Ser. No. 318,819, filed Mar. 3, 1989, now abandoned.
US Referenced Citations (13)
Foreign Referenced Citations (1)
Number |
Date |
Country |
0087720 |
Feb 1983 |
EPX |
Continuations (1)
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Number |
Date |
Country |
Parent |
318819 |
Mar 1989 |
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