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| Number | Title | Issue Date |
| 4874731 | Catalyst for the isomerization of aromatics An improved catalyst for the isomerization of non-equilibrium C8 aromatics is presented which utilizes a novel catalytic composition. This catalyst comprises a Group VIII metal component, a bismuth component, and crystalline aluminosilicate zeo... | 10/17/1989 |
| 4871701 | Alkali-free preparation of large pentasil crystals as coated catalysts and fully crystalline catalysts Pentasil coated catalysts and fully crystalline catalysts in which the individual pentasil crystals are larger than 5 μm are prepared by hydrothermal treatment of SiO2 by a process in which the SiO2 moldings are subjected to a hydro... | 10/03/1989 |
| 4868145 | Dehydrogenation and dehydrocyclization catalyst Non-acid microporous crystalline indium containing materials are combined with Group VIII metal such as platinum to produce catalysts which exhibit high selectivity for dehydrocyclization of C5+ paraffins and which exhibit little, i... | 09/19/1989 |
| 4868146 | Zeolite catalyst composition and synthesis method A surface-inactive shape selective metallosilicate catalyst, useful for the conversion of lower molecular weight olefins to liquid hydrocarbons such as gasoline, distillate, and high viscosity lube oils, is prepared by forming a silica shell on a medium p... | 09/19/1989 |
| 4849386 | Novel silicon-modified catalyst Si/HZSM-5 preparation This invention relates to the preparation of a novel Si/HZSM-5 catalyst through vapor phase deposition of Si on the surface of HZSM-5 catalyst which is obtained by ion exchanging ZSM-5 catalyst. The source of depositing Si comes from tetraalkyl ortho-sili... | 07/18/1989 |
| 4845063 | Zeolite catalyst of improved hydrothermal stability The hydrothermal stability of zeolites is improved by incorporating Group IB metal cations preferably Ag into the zeolite. The improved stability is useful in processes in which the zeolite is frequently exposed to water vapor at elevated temperature, for... | 07/04/1989 |
| 4837398 | Ammonium activation of zeolites in the presence of gaseous ammonia Alumina-composited zeolite catalysts are activated by contact with an aqueous ammonium solution under ammonia gas pressure such that a pH of at least about 8 is maintained in the solution. The treated zeolite may thereafter be calcined without prior ammon... | 06/06/1989 |
| 4828679 | Octane improvement with large size ZSM-5 catalytic cracking Octane and total yield improvement in catalytic cracking of petroleum fractions under cracking conditions can be obtained by adding to conventional cracking catalysts small amounts of an additive catalyst comprising a class of zeolites characterized by a ... | 05/09/1989 |
| 4818509 | Continuous process for manufacturing crystalline zeolites in continuously stirred backmixed crystallizers A continuous process is described for manufacturing a wide variety of zeolites having selected crystal sizes and other desired characteristics. Selected raw materials are fed to a precursor tank of relatively large capacity, wherein the resultant zeolite ... | 04/04/1989 |
| 4808560 | Catalyst for simultaneous desulfurization and dewaxing of residua A catalyst system comprising metal oxide or sulfide hydrogenation component on a ZSM-5 type zeolite support provides excellent hydrowaxing of various residua while simultaneously reducing the sulfur content thereof.... | 02/28/1989 |
| 4788169 | Low acidity alumina-bound zeolites containing tetrahedral boron, gallium, indium and/or thallium A method for preparing low acidity alumina bound zeolites containing tetrahedral boron, gallium, indium and/or thallium which comprises ammonium-exchanging an organic-sorbed zeolite followed by calcination.... | 11/29/1988 |
| 4783555 | Process for the production of a hydration product from an olefinic feedstock A hydration product is produced from an olefinic feedstock by contacting the olefinic feedstock with water under hydration conditions in the presence as catalysts of a unidimensional medium pore crystalline zeolite, for example Theta-1, ferrierite, ZSM-22... | 11/08/1988 |
| 4780436 | Zeolite of omega structure catalysts The invention concerns a new stabilized and dealuminated zeolite of OMEGA structure, characterized by: a total SiO2 /Al2 O3 molar ratio of at least 10, a sodium content lower than 0.5% by weight, a and c parameters of elementary mes... | 10/25/1988 |
| 4778666 | Crystallization method employing microwave radiation A crystallization process employing microwave energy is described. The process is especially useful in the manufacture of porous crystalline materials.... | 10/18/1988 |
| 4732881 | Catalysts for up-grading steam-cracking products There is provided with the present invention a new process for up-grading products resulting from the steam-cracking of hydrocarbons which comprises bringing the steam-cracking reaction products in contact with a catalyst comprising a mixture of from 2.5 ... | 03/22/1988 |
| 4692424 | Dry impregnated manganese zeolite The invention relates to a process for the dry incorporation of manganese ions on the external reactive sites of Zn-ZSM-5 or Zn-ZSM-11 pentasil which comprises mixing a Zn-ZSM-5 or Zn-ZSM-11 zeolite with bentonite, impregnating the dry mixture with a mini... | 09/08/1987 |
| 4692423 | Method for preparing structured catalytic solids A method for manufacturing structured catalysts in which a zeolite is uniformly dispersed on at least one surface of a porous support. The porous support may be organic or inorganic, and in the form of a particle, a sheet, a rod, a tube, or a shape object... | 09/08/1987 |
| 4681747 | Process for the preparation of metallosilicates of tetravalent lanthanide and actinide series metals using heterpoly metallates A molecular sieving metallosilicate is disclosed which comprises a complex represented in terms of mole ratios of oxides by the formula: ##STR1## wherein A is an ammonium, alkyl ammonium, alkyl phosphonium or alkyl arsonium ion; D is an alkali or alk... | 07/21/1987 |
| 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 |
| 4670412 | Modification of crystalline microporous zeolites Natural and synthetic micorporous crystalline minerals that have a robust three-dimensional framework are modified by treatment with a molten salt that contains a component that reacts with the framework. Highly siliceous ZSM-5 and some aluminum phosphate... | 06/02/1987 |
| 4664775 | Method for manufacturing low pour point petroleum product with zeolite TSZ This invention relates to a method for catalytically manufacturing a low pour point petroleum product from distillates of crude oil, and more particularly to a method for economically manufacturing a low pour point petroleum product, such as the insulatin... | 05/12/1987 |
| 4665043 | 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 and compositing the crystals with a binder that contains alumina.... | 05/12/1987 |
| 4659743 | Process and catalyst for converting synthesis gas to liquid hydrocarbon mixture Synthesis gas containing CO and H2 is converted to a high-octane hydrocarbon liquid in the gasoline boiling point range by bringing the gas into contact with a heterogeneous catalyst including, in physical mixture, a zeolite molecular sieve, co... | 04/21/1987 |
| 4657750 | Process for the production of crystalline silicate ISI-4 using ethylene glycol Crystalline silicates and processes for the production thereof are described. These crystalline silicates are of new crystalline structure, which, as determined after calcination in the air at 550° C., have a composition represented by the general formul... | 04/14/1987 |
| 4645655 | Process for the preparation of zeolite Nu-27 using tetramethylmediamine A crystalline zeolitic material, designated Nu-27, has a composition (in terms of mole ratios of oxides) expressed by the formula: wherein M is a monovalent cation of 1/n of a cation of valency n, a is from 0 to 9, X is silicon and/or germanium, Y is one or mo... | 02/24/1987 |
| 4645751 | Regeneration of noble metal-highly siliceous zeolite with sequential hydrogen halide and halogen or organic-halogen compound treatment A process is described for rejuvenation of a deactivated highly siliceous noble metal-containing zeolite catalyst which contains agglomerated noble metals. The process comprises initially reducing the deactivated catalyst in hydrogen, pretreating the thus... | 02/24/1987 |
| 4636483 | Phosphorus containing alumina catalyst for the production of aromatics Superior tolerance to catalyst coking is obtained with a catalytic composite comprising a gallium component and a crystalline aluminosilicate incorporated with a phorphorus containing alumina. A five-fold reduction in the coke content of the spent catalys... | 01/13/1987 |
| 4623633 | Shock calcined aluminosilicate zeolites A process for producing a thermally shock calcined aluminosilicate zeolite comprising (A) precalcining an aluminosilicate zeolite at a relatively low temperature, (B) very rapidly increasing the temperature of the aluminosilicate zeolite to a relatively h... | 11/18/1986 |
| 4618594 | Catalyst and process for the hydrodenitrogenation and hydrocracking of high-nitrogen feeds There is disclosed a catalyst, which catalyst comprises a hydrogenation component comprising chromium, molybdenum, and at least one metal of Group VIII, a crystalline molecular sieve zeolite, and a porous refractory inorganic oxide. Suitable molecular sie... | 10/21/1986 |
| 4615995 | Zeolite catalysts Improved yield in light olefins and aromatics from methanol conversion on Zn and Mn loaded pentasil zeolite and composite pentasil zeolite-asbestos catalysts, the Zn content thereof ranging from 0.1 to 1.0% wt/wt and the Mn content thereof ranging from 0.... | 10/07/1986 |
| 4613717 | Process for producing a 1,4-dialkylbenzene By the vapor phase reaction of benzene or a monoalkylbenzene with an alkylating agent in the presence of a specific catalyst obtained by subjecting a zeolite to a treatment with a gas containing a silicic acid ester and then a calcination in an oxygen-con... | 09/23/1986 |
| 4608355 | Hydrocarbon conversion catalyst Catalysts of improved strength and activity are formed by compositing a clay matrixing material with a zeolite which contains cations of a Group IB metal, preferably a monovalent metal such as silver. The presence of the cations gives the zeolite improved... | 08/26/1986 |
| 4605637 | Hydrothermal activation of acid zeolites with aluminum phosphates There is provided a process for activating a zeolite with an aluminum phosphate material. The process comprises hydrothermally treating an intimate mixture of the zeolite and an effective amount of aluminum phosphate activating agent in contact with an aq... | 08/12/1986 |
| 4599475 | Process for xylene isomerization using ZSM-23 zeolite An improved process is disclosed for the isomerization of xylenes over a zeolite which may contain a platinum group metal. The improvement resides in the use of ZSM-23 zeolite which exhibits enhanced selectivity which inhibits the production of undesired ... | 07/08/1986 |
| 4594333 | Zeolite modification The ion-exchange capacity and acid catalytic activity of a ZSM-5 type zeolite are increased by treatment of a physical mixture of the zeolite and a solid source of aluminum with water in the presence of an alkali metal compound activating agent and an alk... | 06/10/1986 |
| 4584423 | Xylene isomerization using a zeolite with a group II metal A process for isomerizing xylenes containing ethylbenzene to obtain near equilibrium amounts of paraxylene and to convert the ethylbenzene to hydrocarbons readily removable from the xylenes. The isomerization reaction uses a ZSM-5 type catalyst with 0.05 ... | 04/22/1986 |
| 4581215 | Para-selective zeolite catalysts treated with halogen compounds A process is provided for modifying ZSM-5 type zeolite catalysts with halogen-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. Halo... | 04/08/1986 |
| 4579988 | Process for the preparation of an aromatic hydrocarbon mixture A process is disclosed for converting C2 -C4 paraffins into aromatic gasoline over a crystalline gallium silicate having a SiO2 /Ga2 O3 molar ratio between 25 and 250, which silicate has been subjecte... | 04/01/1986 |
| 4578371 | Aluminosilicates having a zeolite structure, and process for the manufacture thereof The invention provides a process for the manufacture of a crystalline, phosphorus-containing zeolite of the ZSM-5 type by mixing water, a silicon dioxide source, an alkali metal hydroxide and an aluminum compound, and reacting this mixture at a temperatur... | 03/25/1986 |
| 4576805 | Increasing lattice metal content of porous inorganic crystalline compositions A method for increasing the total amount of lattice metal in the framework of a particular porous inorganic crystalline composition, its conversion to hydrogen or hydronium form and use thereof as a catalyst component having enhanced catalytic activity is... | 03/18/1986 |
