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| Number | Title | Issue Date |
| 7858069 | Enhancement of alkylation catalysts for improved supercritical fluid regeneration A method of modifying an alkylation catalyst to reduce the formation of condensed hydrocarbon species thereon. The method comprises providing an alkylation catalyst comprising a plurality of active sites. The plurality of active sites on the alkylation catalyst may ... | 12/28/2010 |
| 7332148 | Hydrothermally stable metal promoted zeolite beta for NOreduction A stabilized metal promoted aluminosilicate zeolite, useful in the selective catalytic reduction of nitrogen oxides with ammonia, having a silica to alumina mole ratio of at least 8 and less than 30 and an FT-IR absorption peak at 3781 plus or minus 2 cm−1 | 02/19/2008 |
| 7326401 | MWW type zeolite substance, precursor substance therefor, and process for producing these substances A process for easily synthesizing a zeolite substance containing an element having a large ionic radius in the framework at a high ratio. This process comprises the following first to fourth steps: First Step: a step... | 02/05/2008 |
| 7323154 | Titanosilicate, process for its production, and its use in producing oxidized compound A titanosilicate represented by the following compositional formula (1), wherein in the infrared absorption spectrum measured in the dehydrated state, the absorption spectrum has an absorption band having a relative maximum value at 930±15 cm−1: | 01/29/2008 |
| 7192900 | Hydrocracking catalyst Hydrocracking catalyst composition comprising an optional metal hydrogenation component supported on a carrier comprising a zeolite of the faujasite structure having a unit cell size in the range of from 24.10 to 24.40 Å, a bulk silica to alumina ratio (SAR) above... | 03/20/2007 |
| 7118722 | Hydrothermally stable metal promoted zeolite beta for NOreduction The present invention is directed to a metal-promoted zeolite beta catalyst useful in the selective catalytic reduction of nitrogen oxides with ammonia in which the zeolite beta is pre-treated so as to provide the zeolite with improved hydrothermal stability. | 10/10/2006 |
| 7084097 | Cleaning solution for substrates of electronic materials The present invention relates to a cleaning solution capable of removing efficiently at the same time particles and metallic impurities from a substrate surface without corroding metallic materials. The cleaning solution for cleaning substrates of electronic ... | 08/01/2006 |
| 7011802 | Synthesis of molecular sieves by hydrothermal treatment with acid Molecular sieves containing structure directing agents are treated by heating the SDA-containing molecular sieve at a temperature and for a time sufficient to remove the SDA from the molecular sieve, followed by heating the molecular sieve in an aqueous, acidic medi... | 03/14/2006 |
| 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 |
| 6909026 | Process for liquid phase aromatics alkylation comprising in-situ catalyst reactivation with polar compounds The catalyst becomes at least partially deactivated by sorbing catalyst poisons present in the feed during a process for alkylating aromatics by contacting a feed containing benzene, toluene, xylenes, alkylbenzenes, naphthalene or substituted naphthalenes under liqu... | 06/21/2005 |
| 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 |
| 6521206 | Molecular sieve CIT-6 The present invention relates to new crystalline, molecular sieve CIT-6 that has the topology of zeolite beta. CIT-6 can be in an all-silica form, in a form wherein zinc is in the crystal framework, or a form containing silicon oxide and non-silicon oxide... | 02/18/2003 |
| 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 |
| 6440886 | Zeolite beta and its use in aromatic alkylation There is disclosed a new form of zeolite beta which shows substantially greater stability and greater catalyst lifetime when used in the alkylation and transalkylation of aromatic compounds. The new, surface-modified zeolite beta is characterized by havin... | 08/27/2002 |
| 6221835 | High density zeolites and their production Novel synthetic zeolite compositions of extremely small particle sizes that have increased loading capability, and process technology for producing such compositions are described. So far as is presently known, it has never been possible to form such comp... | 04/24/2001 |
| 6191323 | Process for the reduction of ketones and aldehydes to alcohols using a tin substituted zeolite beta A process for the reduction of ketones or aldehydes to alcohols has been developed. The process involves contacting the ketone or aldehyde with a primary or secondary alcohol and a catalyst at reduction conditions. The catalyst is a molecular sieve having... | 02/20/2001 |
| 6165439 | Dealuminated NU-86 zeolite and its use for the conversion of hydrocarbons The invention concerns a NU-86 zeolite comprising silicon and at least one element T selected from the group formed by aluminium, iron, gallium and boron, preferably aluminium, characterized in that element T has been extracted from the framework, and in ... | 12/26/2000 |
| 6162416 | Zeolite beta and its use in aromatic alkylation There is disclosed a new form of zeolite beta which shows substantially greater stability and greater catalyst lifetime when used in the alkylation and transalkylation of aromatic compounds. The new, surface-modified zeolite beta is characterized by havin... | 12/19/2000 |
| 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 |
| 5968341 | Activated silica enriched mazzite, production method and application thereof The invention provides an activated silica enriched mazzite having a chemical formula in the anhydrous state, expressed in molar ratios of: a M2/n O; Al2 O3 ; b SiO2 ; with a variation from 0 to 0.5, M being an alkaline c... | 10/19/1999 |
| 5932361 | Ceramic based membranes A method of preparing a membrane is disclosed, which includes the step of impregnating an inorganic proton-conductive material into matrices of porous ceramic membranes. The inorganic proton-conductive material may include an inorganic poly-acid, such as ... | 08/03/1999 |
| 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 |
| 5880053 | Method of producing zeolite y Y zeolites with an SiO2 /Al2 O3 ratio in the framework of>100 with a high hydrothermal stability and resistance to aqueous, alkaline solutions are produced by treating a Y zeolite with a SiO2 /Al2 O | 03/09/1999 |
| 5695736 | Tiatanium containing molecular sieve having a zelite beta structure A crystalline molecular sieve having a framework structure isomorphous with zeolite beta and containing Si and Ti, but essentially no framework Al, usefully catalyzes olefin epoxidation wherein hydrogen peroxide is the oxidant.... | 12/09/1997 |
| 5688484 | Non-hydrothermal method of making a titanium-containing zeolite A process for producing a titanium-containing zeolite such as TS-1 titanium silicalite is disclosed. A precursor mixture comprising a silica source such as tetraalkylorthosilicate, a titanium source such as titanium alkoxide, a growth medium comprising a ... | 11/18/1997 |
| 5601798 | Process for preparing zeolite Y with increased mesopore volume The mesopore volume in pores of diameters ranging from 2 to 60 nm of zeolite Y materials is increased by the hydrothermal treatment of such zeolites at temperatures above the atmospheric boiling point of the treating solution. Unique zeolites are produced... | 02/11/1997 |
| 5534135 | Synthesis of zeolites A novel zeolite characterized by a large number of secondary pores, a substantially decreased Lattice Constant of below about 24.19 Å, and a substantially decreased Acid Site Density is attained by hydrothermal and acid-treating of an ultrastable Y-zeoli... | 07/09/1996 |
| 5508019 | Dealumination of aluminosilicates Crystalline aluminosilicates such as zeolite beta may be readily dealuminated using organic sulfonic acids such as methanesulfonic acid to provide useful catalysts or catalyst precursors. A high degree of aluminum removal with minimal loss of crystallinit... | 04/16/1996 |
| 5451391 | Process for the synthesis of a crystalline aluminosilicate enriched in silica, having the structure of mazzite, the aluminosilicate obtained and its use as catalyst for the conversion of hycrocarbons Process for the preparation of a crystalline aluminosilicate enriched in silica, having the structure of mazzite, by hydrothermal crystallization of a gel containing sources of silicon, aluminum and alkali metal ions, in the presence of an organic structu... | 09/19/1995 |
| 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 |
| 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 |
| 5354719 | Method of manufacturing metallosilicates A process for preparing a metallosilicate catalyst includes the steps of: forming a mixture of at least one non-alkali metal, a templating agent, and an organic base; adding a silicon additive to the mixture so as to form a metallosilicate hydrogel; aging... | 10/11/1994 |
| 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 |
