Matches 601 - 650 out of 691 < 1 2 3 4 5 6 7 8 9 10 11 12 13 14 >
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4376722 Alkyltitanium and alkylchromium catalysts for olefin polymerization  
Zeolite supported, organometallic based catalyst composition are provided which are especially suitable for the polymerization of 1-olefins such as ethylene. Alkyltitanium and alkylchromium...
4376104 Method for preparing crystalline aluminosilicates  
Crystalline aluminosilicates having a high silica to alumina molar ratio are prepared by mixing a source of silica, a source of alumina, a source of alkali metal, water and one or more substituted...
4374296 Isomerization of paraffin hydrocarbons using zeolites with high steam-enhanced acidity  
A process is provided for effecting hydroisomerization of a C 4 -C 8 paraffin by contacting the same under hydroisomerization conditions with a catalyst comprising a porous crystalline zeolite...
4374045 Group IB metal modified zeolite catalysts  
A zeolite catalyst composition suitable for para-selective conversion of substituted aromatic compounds, e.g., conversion of aromatics to dialkylbenzene compounds rich in the 1,4-dialkylbenzene...
4372839 Production of high viscosity index lubricating oil stock  
A method for enhancing both the pour point and viscosity index (V.I.) of crude oils of high wax content by contact of the same with two different zeolites, such as ZSM-5 and ZSM-35 is disclosed.
4371457 Zeolites modified with group VA metals  
A modified zeolite catalyst composition useful for the conversion of aromatic compounds to dialkylbenzene compounds rich in the 1,4-dialkylbenzene isomer. The reaction is carried out in the...
4368174 Apparatus for a continuous down-flow zeolite production  
A down-flow apparatus for continuous crystallization of zeolites comprises a vertically-positioned reactor having at least one reactor inlet port at the top thereof and at least one product egress...
4368114 Octane and total yield improvement in catalytic cracking  
Octane and total yield improvement in catalytic cracking processes can be attained by the addition to conventional cracking catalysts of very small amounts of additive catalyst comprising a class...
4366135 Method for preparing zeolites  
Preparation of zeolites having the formula: (1.5±0.6) M 2 /n O.Al 2 O 3 .ySiO 2 .zH 2 O [wherein y ranges from 20 to 90, z ranges from 2 to 12, M is at least one cation and n is the valence of...
4360419 Catalytic dewaxing  
An improved catalytic dewaxing process using a CZH-5 zeolite having a hydrogenation component is disclosed.
4358397 Zeolite catalysts modified with group IV A metals  
A modified zeolite catalyst composition useful for the conversion of aromatic compounds to dialkylbenzene compounds rich in the 1,4-dialkylbenzene compounds rich in the 1,4-dialkylbenzene isomer....
4358395 Hydrogen regeneration of coke-selectivated crystalline aluminosilicate catalyst  
A method is provided for regeneration of a catalyst comprising a crystalline aluminosilicate zeolite characterized by a silica to alumina mole ratio of at least about 12, a constraint index, as...
4357264 Alkaline earth metal modified zeolite catalysts  
A zeolite catalyst composition suitable for para-selective conversion of substituted aromatic compounds, e.g., to dialkylbenzene compounds rich in the 1,4-dialkylbenzene isomer. Such a composition...
4350835 Process for converting ethane to aromatics over gallium-activated zeolite  
A catalytic process is provided for converting gaseous feedstocks containing ethane to liquid aromatics by contacting said gaseous feeds in the absence of added air or oxygen, under conversion...
4349461 Group VIIA metal-modified zeolite catalysts  
A modified zeolite catalyst useful for the conversion of aromatic compounds to dialkylbenzene compounds rich in the 1,4-dialkylbenzene isomer. The reaction is carried out in the presence of a...
4346021 Method for producing aluminosilicates, their use as catalysts and supports and method for producing catalysts therefrom  
Crystalline aluminosilicates having a high (greater than 10:1) silica to alumina molar ratio and an X-ray diffraction pattern substantially the same as that of ZSM-5 zeolite are prepared by mixing...
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...
4331643 Use of diazobicyclooctane (DABCO) as a template in zeolite synthesis  
A process for preparing a ZSM-4 type crystalline zeolite material wherein 1,4-diazobicyclo (2.2.2) octane (DABCO), triethylenediamine (TED) is used as the source of an organic cation.
4326994 Enhancement of zeolite catalytic activity  
A method is provided for increasing the catalytic activity of acid zeolite catalysts characterized by a silica to alumina mole ratio of at least 12 and a constraint index within the approximate...
4324696 Method of preparing crystalline zeolite catalyst of high activity  
Super active catalyst of high hydrocarbon conversion activity prepared by contacting crystalline zeolite materials of silica/alumina mole ratios greater than 7 and having a constraint index between...
4309280 Promotion of cracking catalyst octane yield performance  
A process is provided for increasing gasoline octane number and/or total gasoline yield in catalytic cracking units by the addition of a very small amount of finely divided shape selective additive...
4306106 Conversion of polar compounds using a ZSM-5 zeolite catalyst  
Conversion, e.g. dehydration of aliphatic organic oxygenates having up to about 6 carbon atoms by contact with a crystalline aluminosilicate zeolite, preferably ZSM-5, having a silica to alumina...
4298695 Conversion of synthesis gas with iron-containing catalyst  
A method is disclosed for the conversion of synthesis gas to a liquid hydrocarbon product having a boiling range of less than 400° F. at a 90% overhead utilizing a novel catalyst prepared from...
4297243 Molybdenum-exchanged crystalline aluminosilicate zeolite  
Molybdenum is ion exchanged into a crystalline aluminosilicate zeolite, replacing metals such as sodium, calcium, and potassium, by contacting the zeolite with an aqueous solution containing...
4296083 Zeolite synthesis  
An improved method for synthesizing improved crystalline zeolites characterized by an alumina to silica mole ratio of not greater than 0.083 and a constraint index within the approximate range of 1...
4287166 Zeolite ZSM-39  
A new porous zeolite, a method of making same and the use thereof in catalytic conversion of organic compounds. The new product has a composition, expressed in terms of moles of anhydrous oxides...
4283571 Process for the catalytic isomerization of o-cresol  
Isomerization of o-cresol to m-cresol by contact with a crystalline aluminosilicate zeolite of the ZSM-type, having a silica to alumina ratio greater than 5, at a temperature of about 350° to...
4275256 Shape selective reactions with group VIIA metal modified zeolite catalysts  
A process for the conversion of aromatic compounds to dialkylbenzene compounds rich in the 1,4-dialkylbenzene isomer. The reaction is carried out in the presence of a particular type of zeolite...
4275047 Zeolite synthesis  
Whereas previously zeolites of the ZSM-5 family have been synthesized in reaction mixtures in which the presence of alkylammonium ions was considered to be essential, the use of such ions can be...
4274982 Method for maintaining para-selectivity of modified zeolite catalyst  
A method for prolonging the useful life of para-selective modified zeolite catalysts, said zeolites having a silica to alumina mole ratio of at least about 12, a constraint index of about 1-12 and...
4272288 Concentration, separation and recovery of precious metals  
A process is provided for the concentration, separation and/or recovery of precious metals such as platinum and palladium via their soluble amine complexes from solutions by sorbing said complexes...
4269815 Method of exchanging sodium zeolite  
This invention relates to improvements in the processes of exchanging zeolites, particularly zeolites of the faujasite type to reduce their sodium content by a multiple exchange under autogenous...
4259306 Synthesis of ZSM-39  
A new and useful method for preparing synthetic zeolite ZSM-39 is provided. This new method comprises synthesizing zeolite ZSM-39 in the presence of pyrrolidine as a template rather than the...
4259299 Process for removing ozone from an ozone-containing gas  
A process for removing ozone from an ozone-containing gas which comprises treating the gas with a molded product obtained by the following steps, (a) wet-blending powdery or particulate...
4257885 Novel zeolite compositions and processes for preparing and using same  
Highly siliceous crystalline zeolitic molecular sieve compositions, having pore diameters of approximately 6 Angstroms, are prepared hydrothermally from reaction mixtures free of organic cations....
4247388 Hydrodewaxing catalyst performance  
A method is disclosed for the improvement of catalyst performance in catalytic hydrodewaxing of both petroleum and synthetic hydrocarbon feedstocks utilizing a special group of acidic crystalline...
4237063 Synthesis gas conversion  
Synthesis gas is converted to valuable hydrocarbon or alcohol products over catalysts comprising metal cyanide complexes which have been activated by treatment with a reducing gas. The metal...
4218573 Xylene isomerization  
Isomerization of xylenes in admixture with ethyl benzene by contact with a zeolite catalyst such as ZSM-5 is improved by use of zeolite having a substantial alkali metal content at a temperature...
4209499 Crystalline zeolite ZSM-43 synthesis thereof  
A new crystalline zeolite, designated ZSM-43, a method of making same and the use thereof in catalytic conversion of organic compounds is the subject of this application. The new zeolite has a...
4199556 Method for producing zeolites  
As synthesized by previous methods, ZSM-5 or ZSM-11 zeolites are crystallized in the presence of substantial amounts of a nitrogen-containing compound. When synthesized in this way, they contain an...
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...
4176050 Production of high V.I. lubricating oil stock  
Waxy distillate lubricating oil stocks suitable for the preparation, by conventional unit processes, of high V.I., low pour point lubricating oils, are advantageously catalytically dewaxed with...
4175114 Method for producing zeolites  
As synthesized by previous methods, ZSM-5 or ZSM-11 zeolites are crystallized in the presence of substantial amounts of a nitrogen-containing compound. When synthesized in this way, they contain an...
4170571 Novel combustion catalyst  
A unique class of copper zeolite combustion catalysts which are both highly siliceous and contain an extraordinary amount of zeolitic divalent copper cations which are prepared by ion exchanging...
4146584 Catalytic conversion with ZSM-35  
A new and useful improvement in the method for preparing synthetic crystalline aluminosilicate zeolite ZSM-35 is provided. The improved method comprises synthesizing zeolite ZSM-35 in the presence...
4137195 Catalyst for disproportionation of toluene  
Disproportionation of toluene to produce benzene and xylenes rich in the para isomer is accomplished by subjecting toluene to disproportionation conditions in the presence of a catalyst comprising...
4128504 Stabilized zinc-containing zeolites  
Crystalline aluminosilicate catalysts, especially those containing zinc, are stabilized with respect to elution of the zinc by adding thereto another metal of Group IB or Group VIII (e.g. copper or...
4112056 Preparation of zeolites  
An improved method is provided for preparing a crystalline aluminosilicate zeolite having a high silica/alumina mole ratio which comprises adding a source of aluminum ions to a silica-rich...
4104294 Crystalline silicates and method for preparing same  
A crystalline microporous organosilicate having the composition in terms of moles of oxides of: R 2 O : 0-1.5 M 2 O: <0.05 Al 2 O 3 : 40-70 SiO 2 : x H 2 O wherein R represents a...
4100262 Synthesis of zeolite ZSM-5  
As synthesized by conventional technique, zeolite ZSM-5 crystals are cubic with some twinning and measure in size over the range of from about 3 × 3 microns to about 8 × 8 microns. By...
Matches 601 - 650 out of 691 < 1 2 3 4 5 6 7 8 9 10 11 12 13 14 >