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| Number | Title | Issue Date |
| 4806512 | Virgin catalyst treatment A process for treating a virgin catalyst useful to promote hydrocarbon conversion, e.g., cracking at hydrocarbon conversion, e.g., cracking, conditions comprising: (a) contacting the virgin catalyst with a liquid reductive wash medium; and (b) contacting the r... | 02/21/1989 |
| 4724067 | Stabilized and dealuminated omega zeolite The invention concerns a stabilized and dealuminated omega zeolite, its manufacture and use in catalytic cracking. It has in particular a SiO2 /Al2 O3 molar ratio higher than 10, a sodium content lower than 0.3%, "a" and "c" cr... | 02/09/1988 |
| 4678766 | Enhancement of shape selectivity of zeolites A method is provided for enhancing the shape selectivity of a crystalline zeolite having a silica-to-alumina mol ratio greater than 10. The method consists of treating the zeolite with an ammonium fluoride solution at moderately elevated temperature, in t... | 07/07/1987 |
| 4678763 | Method for reclaiming heat-damaged catalysts Heat-damaged ZSM-5 type catalysts are reclaimed by hydrothermal treatment with an aqueous medium followed by base exchange with an ammonium salt.... | 07/07/1987 |
| 4666693 | Process for the preparation of high-level ion-exchanged zeolites A process is provided for achieving a high degree of exchange for zeolites, e.g., Zeolites F and W. After preparation of the ammonium form, the zeolite is contacted with a solution containing the desired metal cation while simultaneously maintaining the p... | 05/19/1987 |
| 4596704 | Activation of zeolites A method for enhancing the activity of a synthetic crystalline zeolite, including a zeolite having a silica-to-alumina ratio greater than 500, is disclosed which involves compositing the zeolite with an alumina support matrix and reacting the composite wi... | 06/24/1986 |
| 4556550 | Process for the preparation of high-level ion-exchanged forms of Zeolites F and Zeolite W A process is provided for achieving a high degree of exchange for zeolites, e.g., Zeolites F and W. After preparation of the ammonium form, the zeolite is contacted with a solution containing the desired metal cation while simultaneously maintaining the p... | 12/03/1985 |
| 4536485 | Process for the preparation of catalysts for use in ether synthesis An aluminosilicate catalyst for catalytic dehydration of alcohols into ether is prepared by the steps of (a) contacting a crystalline aluminosilicate at below 800° C., preferably 320°-800° C., with a nitrogen-containing base, preferably ammonia or... | 08/20/1985 |
| 4503023 | Silicon substituted zeolite compositions and process for preparing same Aluminum from AlO4 -tetrahedra of as-synthesized zeolites is extracted and substituted with silicon to form zeolite compositions having higher SiO2 /Al2 O3 molar ratios and exhibiting distinctive chemical and ph... | 03/05/1985 |
| 4477582 | Reactivation of steam-deactivated catalysts A process is provided for reactivating a catalyst composition comprising a crystalline zeolite material having a silicon/aluminum atomic ratio of at least about 3.5, said catalyst composition having been deactivated by contact with steam. The method invol... | 10/16/1984 |
| 4444902 | Activation of high silica zeolites A method for enhancing the activity of high silica zeolite, i.e. a zeolite having a silica-to-alumina ratio greater than 100, is disclosed which involves calcining the zeolite, treating same with aluminum fluoride, followed by treating the zeolite with an... | 04/24/1984 |
| 4240932 | Exchanged mordenite catalysts and processes for producing the same This invention relates to exchanged mordenite and catalysts employing the same.... | 12/23/1980 |
| 4231899 | Method of producing a steam stable aluminosilicate zeolite catalyst Steam stable aluminosilicate zeolite catalysts are prepared by calcining said zeolites at an elevated temperature below about 1100° F. in a closed system having a limited amount of oxygen wherein said zeolite contains organic cations and/or is in intimat... | 11/04/1980 |
| 4182692 | Mordenite catalyst Ammonia exchanged large port mordenite, which is subsequently mildly acid leached, and calcined, in which at least 95% of the exchangeable sodium has been removed and having from 0.38 to 0.8 milliequivalents of acid sites at least as strong as 48% sulfuri... | 01/08/1980 |
| 4125483 | Dimerization process catalyst An improved catalyst for the dimerization of butadiene to 4-vinylcyclohexene comprises a cation-exchangeable alumino silicate having incorporated in the lattice thereof by the exchange Cu(I) ions and alkali metal ions, preferably cesium ions.... | 11/14/1978 |
| 4093560 | Ultra high silicon-content zeolites and preparation thereof A method is provided for obtaining crystalline dealuminized products by treating a slurry of a crystalline aluminosilicate zeolite in an aqueous solution of an ammonium or alkali metal salt which upon acidification yields an anion which complexes with alu... | 06/06/1978 |
| 4086186 | Crystalline zeolite ZSM-34 and method of preparing the same A crystalline zeolite, designated ZSM-34, having the composition as synthesized and in anhydrous form, expressed as mole ratios of oxides as follows: (0.5-1.3)R2 O: (0-0.15)Na2 O: (0.10-0.50)K2 O: Al2 O3 | 04/25/1978 |
| 4054511 | Activation of ferrierite and conversion of hydrocarbons therewith Ferrierite ore is activated for normal paraffin conversion by exchanging with the ammonium ion, heating in air at a temperature from about 775° F to about 1000° F and exchanging again with the ammonium ion. Activation of ammonium ferrierite for conversi... | 10/18/1977 |
| 3997474 | Activation of ferrierite Ferrierite ore is activated for normal paraffin conversion by exchanging with the ammonium ion, heating in air at a temperature from about 775° to about 1000° F and exchanging again with the ammonium ion. Activation of ammonium ferrierite for conversion... | 12/14/1976 |
| 3933983 | Method of increasing the thermal stability of crystalline zeolites Methods of increasing the thermal stability of crystalline zeolites are disclosed. The methods are characterized by the steps of either (i), treating the crystalline zeolite first in at least one step with a dilute solution of a fluorine compound whereby ... | 01/20/1976 |
