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| Number | Title | Issue Date |
| 7169291 | Selective hydrocracking process using beta zeolite Increased yields of middle distillate products are obtained in a hydrocracking process by the use of a catalyst containing a beta zeolite. In embodiments, the beta zeolite has not been hydrothermally treated or has been hydrothermally treated at a relatively low tem... | 01/30/2007 |
| 7029651 | Microporous crystalline material (ITQ-19) with laminar characteristics, preparation method and use thereof as a catalyst in the catalytic conversion of organic compounds The invention relates to a novel microporous crystalline material ITQ-19 used in the catalytic conversion of organic compounds, such as, for example, the dewaxing and isodewaxing of paraffins and the disproportionation of toluene. Said material has a characteristic ... | 04/18/2006 |
| 7022637 | Selective methylation catalyst, method of catalyst manufacture and methylation process Novel catalysts and processes in accordance with the invention can accomplish high selectivity and conversion of naphthalenic compounds such as the conversion of methylnaphthalene (2-MN) or naphthalene to 2,6-dimethylnaphthalene (2,6-DMN). The catalysts are prepared... | 04/04/2006 |
| 6982074 | High silica zeolites: UZM-5HS A family of crystalline aluminosilicate zeolites designated UZM-5HS and derived from UZM-5 have been synthesized. The aluminum content of the UZM-5HS is lower than that of the starting UZM-5 thus changing its ion exchange capacity and acidity. These UZM-5HS are repr... | 01/03/2006 |
| 6790433 | Methods to improve heteroatom lattice substitution in large and extra-large pore borosilicate zeolites The invention, in one embodiment, is a method for preparing crystalline zeolites by (a) contacting a calcined essentially aluminum free borosilicate zeolite with an aqueous acid solution, thereby producing an at least partially deboronated zeolite; (b) contacting sa... | 09/14/2004 |
| 6653396 | Process for the preparation of zeolite A for use in formulations based on two-component polyurthane resins Zeolites of type A wherein all the cationic sites of which occupied by sodium, calcium and/or magnesium, potassium and hydronium cations, which exhibit the advantage of having a water adsorption capacityࣙ23%, which do not adsorb and therefore cannot des... | 11/25/2003 |
| 6573131 | Silica zeolite low-k dielectric thin films and methods for their production Thin films for use as dielectric in semiconductor and other devices are prepared from silica zeolites, preferably pure silica zeolites such as pure-silica MFI. The films have low k values, generally below about 2.7, ranging downwards to k values below 2.2... | 06/03/2003 |
| 6475465 | Titanium-silicalite molecular sieve and the method for its preparation The present invention relates to a titanium-silicalite (TS-1) molecular sieve and the method for preparation of the same, wherein each crystallite of said titanium-silicalite molecular sieve has a hollow cavity with a radial length of 5-300 nm. The benzen... | 11/05/2002 |
| 6468501 | Method for heteroatom lattice substitution in large and extra-large pore borosilicate zeolites The present invention provides a method for preparing a zeolite having lattice substituted heteroatoms. The method includes: (a) contacting a calcined borosilicate zeolite with an acid, thereby producing an at least partially deboronated zeolite; and (b) ... | 10/22/2002 |
| 6395069 | Aqueous solution which can be used in an ion-exchange process An aqueous solution with a pH of greater than 5, preferably of at least 6.5, can be used in an ion-exchange process, in particular a process for the manufacture of a zeolite. This aqueous solution comprises metal cations, such as zinc, and an agent for co... | 05/28/2002 |
| 6063944 | Method for preparing lattice-inserted titanium zeolites, and use thereof A method is provided for preparing fully lattice-inserted titanium zeolites by post-synthesis processing of the synthetic zeolite optionally containing titanium with an inorganic acid, wherein the post-synthesis processing comprises processing the zeolite... | 05/16/2000 |
| 6054113 | Method for preparing high silica faujacitic zeolites A method for preparing novel zeolitic catalyst compositions having a high Si/Al ratio and a crystallinity of at least about 70%. The method involves cation exchanging an as synthesized faujasite material having an Si/Al greater than about 4 with a compone... | 04/25/2000 |
| 6017508 | Process of modifying the porosity of aluminosilicates and silicas, and mesoporous compositions derived therefrom A process of modifying the porosity of an aluminosilicate or silica whose porosity is not amenable to modification by acid extraction. The process involves contacting said aluminosilicate or silica with an alkali aluminate, and then extracting the alumina... | 01/25/2000 |
| 5968475 | Dealuminated IM-5 zeolite The present invention relates to a dealuminated IM-5 zeolite and to any catalyst comprising that zeolite which is at least partially in its acid form. The invention also relates to the preparation of the catalyst and to the catalyst. Finally, the inventio... | 10/19/1999 |
| 5900226 | Drying agents for non-foamed polyurethanes Mild acid treatment of zeolite 3A molecular sieve to modify the pH of the surface of the molecular sieve to a pH ranging between 9.5 and 11 was found to significantly minimize the effect of the zeolite 3A on the pot life of non-foamed polyurethanes. Incre... | 05/04/1999 |
| 5518708 | Substitution of Sn in place of Al in the framework of molecular sieve via treatment with fluoride salts Molecular sieve compositions are prepared by extracting aluminum and substituting chromium and/or tin for extracted aluminum to give molecular sieve products containing framework chromium and/or tin atoms. The process of preparing the chromium and/or tin-... | 05/21/1996 |
| 5425934 | Dealumination and selective removal of organic material from zeolites Disclosed is a method for treating synthetic zeolite to remove organic template material therefrom and concurrently therewith effect dealumination of the zeolite. The method comprises the steps of providing a body of synthetic zeolite containing organic t... | 06/20/1995 |
| 5401488 | Substitution of Sn in place of Al in the framework of molecular sieve via treatment with fluoride salts Molecular sieve compositions are prepared by extracting aluminum and substituting chromium and/or tin for extracted aluminum to give molecular sieve products containing framework chromium and/or tin atoms. The process of preparing the chromium and/or tin-... | 03/28/1995 |
| 5389357 | Modified crystalline aluminosilicate zeolites and process for their preparation A process for the manufacture of a modified aluminosilicate zeolite is disclosed which includes contacting a starting zeolite in an aqueous phase with a dealuminating agent at a pH value of lower than 4 in the presence of a soluble silica. A novel zeolite... | 02/14/1995 |
| 5310534 | Process for dealuminization of the synthetic zeolites of large pores, catalysts and selective organophilic adsorbents containing the dealuminized zeolites obtained according to the process and essentially silicic beta zeolite A process is provided for dealuminization of zeolites having large pores, the diameter of the aperture of the pores being greater than or equal to about 0.7 nm and the silica/alumina ratio greater than or equal to about 6. The process comprises acid leach... | 05/10/1994 |
| 5298234 | Alumina-silica resin additive Disclosed is an alumina-silica resin additive consisting of amorphous alumina-silica particles in which a definite cubic or spherical shape is retained in primary particles and the particle sizes of both the primary particles and the secondary particles a... | 03/29/1994 |
| 5238675 | Gallium zeolites Zeolites containing gallium in their crystalline framework structure are prepared by treating a zeolite material with a reagent capable of replacing a part of the aluminum of the framework structure of the zeolite material with the gallium. The method is ... | 08/24/1993 |
| 5223240 | Method of preparing zeolite Y An aqueous suspension of zeolite NaY is treated in with sodium hydroxide solution. The treated zeolite NaY is subsequently dealuminized with silicon tetrachloride.... | 06/29/1993 |
| 5174979 | Mixed ion-exchanged zeolites and processes for the use thereof in gas separations Lithium/alkaline earth metal X zeolites in which the lithium:alkaline earth metal equivalent ratio is from about 95:5 to about 50:50 and lithium/alkaline earth metal A zeolites in which the lithium:alkaline earth metal equivalent ratio is from about 10:90... | 12/29/1992 |
| 5100644 | Process for inserting silicon into zeolite frameworks The removal of aluminum and silicon atoms from the framework of crystalline zeolites and the reinsertion of at least some of the removed silicon atoms into the sites vacated by extracted aluminum atoms is accomplished by the process of contacting the zeol... | 03/31/1992 |
| 5098687 | Substituted aluminosilicate compositions and process for preparing same This invention relates to molecular sieve compositions and processes for using the molecular sieves. The molecular sieves have a three-dimensional microporous crystalline framework structure of tetrahedral oxide units of AlO2, SiO2, ... | 03/24/1992 |
| 5080878 | Modified crystalline aluminosilicate zeolite catalyst and its use in the production of lubes of high viscosity index The catalytic activity of a crystalline aluminosilicate zeolite having a Constraint Index of from about 1 to about 12 for a variety of hydrocarbon conversions including the oligomerization of olefins to provide high viscosity index lubes is significantly ... | 01/14/1992 |
| 5013537 | Process for the synthesis of zeolites of the ferrisilicate type, products so obtained The invention relates to a novel process for the synthesis of zeolites of the ferrisilicate type called ferrizeosilites, to the products obtained by this process as well as their uses. Ferrizeosilite according to the invention is characterized by (a) a ch... | 05/07/1991 |
| 4996034 | Process for preparing silicon substituted zeolite compositions In the process for inserting extraneous silicon atoms into lattice sites of zeolite crystals from which aluminum atoms have been extracted, it has been found that the use of more concentrated fluorosilicate salt solutions and shorter contact times between... | 02/26/1991 |
| 4943545 | Activation of zeolites Zeolitic catalysts containing framework displaced aluminum, e.g., steamed or spent catalysts, are activated by contact with aqueous fluoride solution under mild conditions. The treatment can enhance catalytic activity, ion-exchange capacity and crystallin... | 07/24/1990 |
| 4933161 | Tin substitution into zeolite frameworks This invention relates to novel zeolitic compositions having tin substituted into the framework positions and a method for their preparation. The process of preparation more specifically involves hydrothermally treating aluminosilicate silica zeolite in t... | 06/12/1990 |
| 4892720 | Substituted aluminosilicate compositions and process for preparing same Molecular sieve compositions are prepared by extracting aluminum and substituting titanium and/or iron for extracted aluminum to give molecular sieve products containing framework titanium and/or iron atoms. The process of preparing the titanium and/or ir... | 01/09/1990 |
| 4851200 | Method for removing organic residue from as-synthesized zeolites There is provided a three-step method for removing the residue of an organic directing agent from as-synthesized zeolites. The first step involves contacting the as-synthesized zeolite with an aqueous solution of a fluorosilicate salt such as ammonium flu... | 07/25/1989 |
| 4840779 | Crystalline zeolite LZ-202 and process for preparing same The crystalline omega-type zeolite LZ-202 can be prepared by a novel process that eliminates the prior art requirement of a templating agent. Unlike prior art omega-type zeolites, the as-synthesized form is totally ion-exchangeable and can be enriched wit... | 06/20/1989 |
| 4788378 | Dewaxing by isomerization A process is provided for dewaxing hydrocarbon feedstock by isomerizing the waxy components of the feedstock over catalyst comprising a siliceous zeolite having been prepared by the method comprising providing a boron-containing zeolite Beta, treating the... | 11/29/1988 |
| 4788370 | Catalytic conversion A process is provided for converting feedstock comprising C2+ olefins, C2 -C7 paraffins or mixtures thereof to product comprising C5+ hydrocarbons over a catalyst comprising a siliceous zeo... | 11/29/1988 |
| 4784749 | Cracking/dewaxing A process is provided for converting feedstock comprising hydrocarbon compounds to product comprising hydrocarbon compounds of lower molecular weight than feedstock hydrocarbon compounds over a catalyst comprising a siliceous zeolite prepared by the metho... | 11/15/1988 |
| 4753910 | Dealumination of aluminosilicate zeolites In a method of removing tetrahedral aluminum from a aluminosilicate zeolite, the zeolite is treated with an aqueous fluorosilicate solution which reacts with tetrahedral aluminum in said zeolite to produce water-insoluble aluminum fluoride. In addition, d... | 06/28/1988 |
| 4701313 | Replacing boron with silicon in zeolite beta using SiCl4 The present invention relates to siliceous zeolite catalysts produced by a method which includes selecting an amount of aluminum framework species to be retained in a zeolite catalyst product, and use of a silicon substitution treatment to replace more re... | 10/20/1987 |
| 4684511 | Process for the halogen modification of aluminophosphate molecular sieves and a product so produced A process for treating crystalline aluminophosphates to provide aluminophosphates having modified catalytic properties. The crystalline aluminophosphates are contacted with a halogen-derived compound at an effective temperature and for an effective time t... | 08/04/1987 |
