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| Number | Title | Issue Date |
| 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 |
| 4554260 | Two stage process for improving the catalyst life of zeolites in the synthesis of lower olefins from alcohols and their ether derivatives A process for improving the catalyst life of zeolites employed in the conversion of alcohols (e.g. methanol) and/or their ether derivatives (e.g., dimethyl ether) wherein a suitable zeolite is modified in a 2-stage procedure by providing a controlled low ... | 11/19/1985 |
| 4550091 | Non-aqueous exchange of acidic sites on molecular sieves Surface-active catalytic sites are deactivated on catalyst support materials wherein the catalyst comprises crystalline aluminosilicate or borosilicate molecular sieve catalytic compositions without deactivating all acidic sites of the molecular sieve. Re... | 10/29/1985 |
| 4550092 | Activity enhancement of high silica zeolites A crystalline high silica-containing zeolite such as ZSM-5 is treated with an ammoniacal alkali metal aluminate so as to enhance the catalytic activity thereof.... | 10/29/1985 |
| 4548914 | Zeolite catalysts of improved activity and para-selectivity A method is provided for treating modified ZSM-5 type zeolite catalysts with water vapor in order to enhance the aromatics conversion activity and/or the para-selective properties of such catalysts for the conversion of aromatic materials. The modified ze... | 10/22/1985 |
| 4539304 | Pretreatment method for increasing conversion of reforming catalyst A pretreatment process is disclosed for increasing conversion of reforming catalysts wherein the catalyst is treated at from 120° C. to 260° C.; then the temperature of the treated catalyst is maintained at a temperature of from 370° C. to 600° C. in ... | 09/03/1985 |
| 4539305 | Pretreatment method for enhancing the selectivity and increasing the stability of a reforming catalyst A pretreatment method is disclosed for enhancing the selectivity and increasing the stability of a reforming catalyst comprising a large-pore zeolite containing at least one Group VIII metal. In this method, the catalyst is reduced in reducing atmosphere ... | 09/03/1985 |
| 4526880 | Hydrothermal zeolite activation The acid activity of a high silica content crystalline zeolite that contains framework boron is increased by hydrolyzing a portion of the boron before compositing the crystals with a binder that contains alumina.... | 07/02/1985 |
| 4524140 | Hydrothermal zeolite activation Substitution of aluminum or gallium for boron or iron contained in the framework of a high silica content zeolite is effected by treating the zeolite in liquid water in the presence of a compound of aluminum or gallium.... | 06/18/1985 |
| 4524055 | Crystalline aluminosilicate zeolite and process for production thereof A novel crystalline aluminosilicate zeolite characterized by having (a) a silica/alumina mole ratio in the range of from 10 to 100, (b) X-ray lattice distances d shown in Table A in the specification, and (c) a (cyclohexane/n-hexane) adsorption ratio of at least 0.7. Th... | 06/18/1985 |
| 4522929 | Active zeolite catalysts of improved stability A zeolite of improved stability for use in acid-catalyzed reactions is prepared by mildly presteaming the catalyst under controlled conditions of temperature, time, and steam partial pressure. The resulting catalyst retains nearly the same activity as tha... | 06/11/1985 |
| 4520118 | Catalytic activity of aluminosilicate zeolites This invention relates to a method of improving the catalytic activity of a freshly made zeolite loaded with gallium ions by first treating with steam and then with hydrogen. Steam and hydrogen treatment may be carried out before or after loading with gal... | 05/28/1985 |
| 4513091 | Hydrothermal zeolite activation In the process for activating high-silica zeolite catalyst with an ionized activating agent wherein a crystalline zeolite catalyst having a silica:alumina ratio greater than 70 and a constraint index of 1 to 12 is contacted with the activating agent at el... | 04/23/1985 |
| 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 |
| 4497903 | Activated cobalt-substituted layered aluminosilicate for synthesis gas conversion Synthesis gas conversion catalyst prepared from synthetic layered aluminosilicate having a montmorillonite-type structure and containing cobalt substituted in the crystal lattice are activated for the conversion of synthesis gas by a sequential reduction,... | 02/05/1985 |
| 4487843 | Catalytic activity of aluminosilicate zeolites The present invention relates to a method of improving catalytic activity of a zeolite by first steam treating the zeolite and then loading the zeolite so treated with a Group IIIb metal, especially gallium. It has been found that steam treatment prior to... | 12/11/1984 |
| 4486616 | Rejuvenation of deselectivated alkylation catalyst A process for alkylation of aromatic hydrocarbon reactants to dialkylbenzene products, whereby chemically modified zeolite catalysts are treated with an organic acid to enhance their intrinsic para-selectivity in the alkylation reaction. The modified zeol... | 12/04/1984 |
| 4481018 | Polyvalent ion exchanged adsorbent for air separation The invention relates to faujasite-containing compositions in which the original hydrogen or monovalent forms are ion exchanged to their polyvalent form and then thermally activated to promote dehydration and dehydroxylation of the faujasite while maintai... | 11/06/1984 |
| 4478949 | Para-selective zeolite catalysts treated with sulfur compounds A process is provided for modifying ZSM-5 type zeolite catalysts with sulfur-based treating agents in order to enhance the para-selective properties of such catalysts for the conversion of aromatic materials to dialkyl-substituted benzene compounds. Sulfu... | 10/23/1984 |
| 4478950 | Activity enhancement of high silica zeolites by thermal treatment with alkaline aluminate A crystalline high silica-containing zeolite, such as ZSM-5, is hydrothermally treated with aluminate ion to enhance the catalytic activity.... | 10/23/1984 |
| 4477585 | Para-selective zeolite catalysts treated with carbon dioxide A process is provided for modifying ZSM-5 type zeolite catalysts with carbon dioxide treating agent in order to enhance the para-selective properties of such catalysts for the conversion of aromatic materials to dialkyl-substituted benzene compounds. Cata... | 10/16/1984 |
| 4477584 | Para-selective zeolite catalysts treated with nitrogen compounds A process is provided for modifying ZSM-5 type zeolite catalysts with gaseous nitrogen-based treating agents in order to enhance the para-selective properties of such catalysts for the conversion of aromatic materials to dialkyl-substituted benzene compou... | 10/16/1984 |
| 4468475 | Hydrothermal activation of acid zeolites with alumina In the process for activating high-silica zeolite catalyst with alumina activating agent wherein a crystalline zeolite catalyst having a silica:alumina ratio greater than 70 and a constraint index of 1 to 12 is contacted with the activating agent at eleva... | 08/28/1984 |
| 4458026 | Catalysts for aldol condensations Heat treated anionic clay mineral is an improved catalyst for the conversion of acetone to mesityl oxide and isophorone as well as for the aldo condensation of other carbonyl-containing compounds.... | 07/03/1984 |
| 4452910 | Chromium expanded smectite clay Expanded layer, smectite clay having a regular pore structure suitable for catalytic uses and a process for preparing said expanded clay by treating a suspension of commercial smectite clay with a chromium-oligomer solution and subjecting the treated clay... | 06/05/1984 |
| 4443554 | Activation of alkali metal zeolite catalysts by steaming Inactive zeolites such as NaZSM-5 are activated by steaming in the presence of a binder such as alumina.... | 04/17/1984 |
| 4440958 | Method for promoting the activity of cation-exchangeable layered clay and zeolite catalysts in proton-catalysed reactions The activity of cation-exchangeable layered clay or crystalline aluminosilicate catalyst in esterification, etherification, hydration, and cracking reactions is promoted by addition of a strong acid such as sulphuric acid, phosphoric acid, hydrochloric ac... | 04/03/1984 |
| 4440867 | Calcined, high surface area, particulate matter, processes using this matter, and admixtures with other agents This invention is concerned with production and use of high surface area particulate matter by calcining a charge of clay mineral, feldspar, zeolite, coal ash, fly ash, pozzolan or volcanic ash for a time to develop fractures which increase the surface ar... | 04/03/1984 |
| 4435311 | Continuous reactivation of AMS-1B-containing catalyst systems A process to reactivate a noble metal-containing AMS-1B crystalline borosilicate catalyst comprising contacting such catalyst with water.... | 03/06/1984 |
| 4420418 | Para-selective zeolite catalysts A process is provided for treating modified ZSM-5 type zeolite catalysts with carboxylic acid (or anhydride) and water vapor treating agents in order to enhance the para-selective properties of such catalysts for the alkylation of aromatic materials witho... | 12/13/1983 |
| 4414189 | Modification of catalytic activity of synthetic zeolites A method is provided for effectively tailoring the catalytic activity of synthetic crystalline zeolites. The method involves synthesizing the zeolite from a reaction mixture containing a source of bulky organic cations, contacting the synthesized zeolite ... | 11/08/1983 |
| 4390414 | Selective dewaxing of hydrocarbon oil using surface-modified zeolites A method is described for selectively dewaxing a waxy hydrocarbon oil feedstock which method comprises contacting said waxy hydrocarbon oil stock in the presence of hydrogen with a zeolite (1) which has been chemically modified by reaction, under dry, anh... | 06/28/1983 |
| 4335020 | Method of preparation of composite zeolite catalysts A method of removing the organic cation from an organic cation-containing zeolite which comprises contacting the zeolite at low temperatures with an aqueous solution of a compound of a class of chemical treating agents that will improve the dispersive and... | 06/15/1982 |
| 4323481 | Synthesis of molecular sieves using beta-diketones as organic templates A ferrierite crystalline aluminosilicate is prepared by (1) forming an aqueous mixture of an oxide of aluminum, an oxide of silicon, a metal cation and a beta-diketone as a template compound, (2) maintaining the pH of such mixture between 9 and 14, and (3... | 04/06/1982 |
| 4187283 | Method for improving organic cation-containing zeolites A method is provided for improving the adsorptive properties, catalytic capabilities and thermal stability of organic cation-containing crystalline zeolites which comprises the sequential steps of (1) heating said zeolite, under controlled temperature con... | 02/05/1980 |
| 4182693 | Hydrocarbon treating catalyst A catalyst suitable for treating hydrocarbons comprising (1) particles of a crystalline aluminosilicate zeolite, (2) particles of a substantially catalytically inert inorganic oxide having a size of less than 10 microns in diameter, and (3) a catalytic in... | 01/08/1980 |
| 4134965 | Caustic washed molecular sieves A novel improved molecular sieve is prepared by a caustic wash process. The sieves so prepared show improved properties in reactions involving e.g., superior acid scavenging ability.... | 01/16/1979 |
| 4104152 | Hydrogenation process with sulfided catalyst A hydrogenation process utilizing a hydrogenation catalyst in an oxidized state which catalyst is activated by a method which yields a superior performing hydrogenation catalyst. The hydrogenation catalyst is reduced, sulfided and stripped by a procedure ... | 08/01/1978 |
| 4064036 | Pressure testing of catalyst loaded reactors In the pressure testing of catalyst-loaded reactors with nitrogen gas at elevated temperatures, it is found that certain types of zeolite catalysts are substantially degraded in activity. The catalysts concerned comprises a Group VIII noble metal in an ox... | 12/20/1977 |
