Abstract: A process is described for preparing a supported zeolite membrane constituted by a composite continuous zeolite/support layer of controlled thickness, wherein the zeolitic phase is principally localized in the pores of a porous support and optionally on the external surface thereof, the process comprising at least the formation of a precursor gel of the zeolite, bringing the gel into contact with the support and crystallizing the zeolite. The zeolite is crystallized by carrying out a thermal program comprising at least three steps in succession: a first constant temperature stage carried out at a temperature in the range 50° C. to 300° C., cooling to a temperature of strictly less than 50° C. followed by a second constant temperature stage carried out at a temperature range of 50° C. to 300° C. The prepared membrane is used in particular in processes for separating gas or separating liquids.

Abstract: Zeolites exchanged with lithium, rubidium, cesium cations and trivalent cations are prepared by first partially, fully or excessively ion-exchanging a sodium-containing zeolite, a potassium-containing zeolite or a sodium- and potassium-containing zeolite with trivalent cations, then calcining the partially, fully or excessively trivalent cation-exchanged zeolite, and then ion exchanging the calcined zeolite with lithium rubidium, cesium cations, thereby replacing hydrogen and any sodium and/or potassium cations remaining in the zeolite with lithium, rubidium, cesium cations, whereby trivalent cations present in the zeolite will not be substantially replaced by the lithium ions.

Abstract: Catalytic compositions are described for hydrocarbons cracking containing at least two zeolitic components of which at least one zeolitic component containing aluminium in its structure is selected from among ITQ-7 zeolites, intergrowths of ITQ-7 zeolites, ITQ-7 zeolites exchanged with rare earths, intergrowths of ITQ-7 zeolites exchanged with rare earths, and combinations of them. These combinations are of utility as catalysts for cracking in FCC units and permit C3 and C4 olefins to be efficiently obtained along with high yields of gasoline. Also described is the use of a zeolitic material containing aluminium in its structure and selected from among ITQ-7 zeolites, intergrowths of ITQ-7 zeolites, ITQ-7 zeolites exchanged with rare earths, intergrowths of ITQ-7 zeolites exchanged with rare earths, and combinations of them, as a catalytic material in hydrocarbon catalytic cracking processes.

Abstract: A gas stream that contains nitrogen oxides is passed, in the presence of a reducing agent, over a catalyst body with an active material that contains a zeolite and titanium dioxide. The zeolite is a hydrogen-ion-exchanged, acid zeolite. Even at temperatures above 450° C., the nitrogen oxides contained are still effectively converted into nitrogen and water.

Abstract: The present invention is directed to a catalyst composition for FCC which has high efficiency in the production of light olefins while maintaining the bottoms conversion. The catalyst composition is prepared by: a) ex situ activating an olefin-selective zeolite with at least 10 wt % of a phosphorus-containing compound, calculated as P2O5 based on the total amount of olefin-selective zeolite. b) combining the activated olefin-selective zeolite with 10-40 wt % catalytic cracking component, binder, and 0-25 wt % silica in a slurry, so that the total amount of amorphous alumina present in the final catalyst composition is at least 10 wt %, and c) spray-drying the slurry to form catalyst particles.

Abstract: A fluid catalytic cracking catalyst made from microspheres that initially contain kaolin, a dispersible boehmite alumina and a sodium silicate or silica sol binder. The kaolin portion contains hydrous kaolin and optionally kaolin which has been calcined through its characteristic exotherm. Calcination of the hydrous clay to metakaolin and formation of in-situ zeolite by treatment with sodium silicate yields a catalyst containing Y-faujasite and transforms the dispersible boehmite into a transitional alumina which contains a gamma alumina phase. The transitional alumina may contain a delta alumina phase as well. The catalyst can be used to crack resid or resid-containing feeds as the alumina phase formed from the dispersible boehmite passivates nickel and vanadium contaminants.

Abstract: An exhaust-gas-purifying catalyst wherein a first zeolite loaded with a catalyst metal and a second zeolite unloaded with a catalyst metal are mixed. By actively adsorbing HC onto the second zeolite, it is possible to inhibit the catalyst metal loaded on the first zeolite from being poisoned by HC, and to sufficiently adsorb HC. Accordingly, since the HC adsorbing capability is improved, and since the HC poisoning of the catalyst metal is suppressed, the NOx purifying capability is enhanced and the durability is also upgraded.

Abstract: A hydrocracking catalyst has a carrier that has particles of a compound oxide and a binder present between these particles, and at least one metal component selected from Group 6, Group 9 or Group 10 of the Periodic Table supported on the carrier. The catalyst has a median pore diameter of 40 to 100 Å and the volume of pores whose pore diameter falls within a range of 40 to 100 Å is at least 0.1 mL/g. Moreover, the volume of pores of the catalyst whose pore diameter falls within a range of 0.05 to 5 &mgr;m is 0.05 to 0.5 mL/g, and the volume of pores whose pore diameter is 0.5 to 10 &mgr;m is less than 0.05 mL/g. This catalyst is mechanically strong enough for practical use and has a high conversion rate and middle distillate selectivity in hydrocracking of hydrocarbon oils, particularly vacuum gas oil.

Abstract: This invention discloses a catalyst and process for removing nitrogen oxides from exhaust streams under lean burn conditions using hydrocarbons as the reductant. Catalysts consists of two phases, a metal exchanged molecular sieve and a stabilizing metal oxide associated with the molecular sieve.

Abstract: A zeolite A or an A/X mixture having an LCC >70 g liquid/100 g zeolite (hydrated) and a cold water CER >200 mg CaCO3/gram anhydrous zeolite (hydrated). The zeolite product may have a crystal size of 0.1-0.7 microns, a bulk density of 0.19-0.37 g/ml, and a median particle size of 1-5 microns. A process for making zeolite A or A/X mixtures is also claimed, including mixing a sodium silicate solution, a sodium aluminate solution, and an amorphous aluminosilicate initiator gel in a mixing vessel to create an aluminosilicate synthesis gel, and crystallizing the aluminosilicate synthesis gel to form zeolite crystals. The sodium aluminate solution may be added gradually to at least the sodium silicate solution at a rate of about 1-5% of the total batch alumina per minute, and/or a percentage of the total batch alumina may be added as alumina trihydrate (ATH) powder.

Abstract: A molecular sieve adsorbent for the purification of gas streams containing water vapor and carbon dioxide. The adsorbent is a combination of sodium form of a low-silica faujasite, having a residual content of potassium ions less than about 8.0 percent (equiv.), a low content of crystalline and amorphous admixtures and crystal sizes generally within the range of 1-4 &mgr;m, and a binder. A process for the adsorbent preparation which comprises specific parameters of low silica faujasite synthesis, sodium-potassium ion exchange, blending and granulation.

Abstract: According to the present invention, provided is a method of selectively removing carbon monoxide, comprising the steps of preparing a catalyst bed capable of selectively oxidizing carbon monoxide and including a plurality of catalyst layers arranged in series and the plurality of catalyst layers differing from each other in the temperature of application and arranged in the order of the application temperature such that the catalyst layer having the highest application temperature constitutes the upstream side of the catalyst bed, and introducing a gaseous mixture containing H2, CO and an oxidizing agent of O2 into the catalyst bed through the upstream side of the catalyst bed so as to selectively oxidize and remove CO from the gaseous mixture.

Abstract: The invention relates to a catalyst that contains at least one matrix, at least one zeolite and at least one element that is deposited on the catalyst or contained in the matrix and selected from the group that is formed by the elements of groups VIB, VIII and VB, and at least one promoter element (phosphorus, boron, silicon), in which the zeolite contains in its porous network at least one element of group VB. The invention also relates to the use of this catalyst for the transformation of hydrocarbon fractions, in particular hydrorefining and hydrocracking.

Abstract: A process for preparing a hydrocarbon conversion catalyst for use in a Fluid Catalyst Cracking (FCC) unit includes the steps of preparing a modified alumina-silica composite by reacting alumina with an acid to obtain an acidified alumina, aging the acidified alumina for from 0.25 to 60 hours, adding a silica source to the acidified alumina to obtain the composite; preparing a dispersed precursor slurry of the modified alumina-silica composite, and a rare earth exchanged USY zeolite (REUSY) containing at least one rare earth oxide present in an amount ranging from 3.8 to 4.0 wt %, and optionally kaolin clay; spray-drying the slurry to obtain spherical particles; and subjecting the spherical particles to calcination.

Abstract: According to the present invention, provided is a method of selectively removing carbon monoxide, comprising the step of preparing a catalyst bed capable of selectively oxidizing carbon monoxide and including a plurality of catalyst layers arranged in series and the plurality of catalyst layers differing from each other in the temperature of application and arranged in the order of the application temperature such that the catalyst layer having the lowest application temperature constitutes the upstream side of the catalyst bed, and the step of introducing a gaseous mixture containing H2, CO and an oxidizing agent of O2 into the catalyst bed through the upstream side of the catalyst bed and supplying an additional oxidizing agent to the gaseous mixture when the gaseous mixture is introduced into the catalyst layer having a high application temperature so as to selectively oxidize and remove CO from the gaseous mixture.

Abstract: The present invention provides a method for preparing a catalyst for the reduction of nitrogen oxides by the use of natural gas as a reducing agent in an excess oxygen atmosphere, which comprises of filling zeolite with an organic compound having molecular weight of 100˜250 prior to loading catalytically active noble metal components on a zeolite. Since the method according to the present invention supports catalytic active noble metal components on a zeolite under the condition that the pores of zeolite are filled with organic compounds, the noble metal component, which is essential for forming highly active NOx reduction catalyst, can be supported precisely on the desired positions of zeolite pores. Therefore, the NOx reduction catalysts prepared by the present invention are very useful for the purification of exhaust gas in an excessive oxygen atmosphere such as gas turbines, boilers or lean-burn automobiles.

Abstract: A process for preparing a reforming catalyst comprises incorporating a group IA alkali metal from an aqueous alkaline solution into a zeolitic material by means of ion exchange to form an alkali metal-modified zeolitic support material, which is dried, calcined and combined with an inorganic oxide. The combination is dried and calcined to form a stable inorganic oxide/zeolitic catalyst support which is impregnated with a Group VIII metal by ionic exchange to form an impregnated inorganic oxide/zeolitic catalyst support which is dried, calcined and reduced from a naphtha reforming catalyst.

Abstract: A hydrophobic zeolite is prepared having high Hydrophobicity Index number by calcining a zeolite with steam under turbulent condition with respect to flow pattern of the zeolite and at a temperature within the range of 650-1000° C.

Abstract: An exhaust gas purifying catalyst comprises a hydrocarbon adsorbent layer and a metal-based catalyst layer on a monolithic support. The catalyst contains zeolite in the underlying hydrocarbon adsorbent layer and contains noble metals such as palladium, platinum, rhodium, etc. in the overlying metal-based catalyst layer. Also, both layers contain an alkaline metal, etc., and a weight ratio of the alkaline metal, etc. contained in the metal-based catalyst layer to the alkaline metal, etc. contained in the hydrocarbon adsorbent layer is set to 60:40 to 99:1. A process for preparing the above catalyst comprises forming the metal-based catalyst by coating slurry. The slurry contains water insoluble or water hardly-soluble alkaline metal and/or alkaline earth metal compound.

Abstract: A catalyst composition for the cracking of heavy oil, which has high cracking activity for heavy components in the heavy oil and features reduced deposition of coke. The catalyst composition is comprised of a zeolite, a mixed metal oxide, clay and a metal oxide, and the total acidity of a portion of the catalyst; the portion being composed of the catalyst components other than the zeolite, is from 0.02 to 0.08 mmol/g.

Abstract: An ion exchange method is provided for loading and uniformly distributing noble metals into a catalyst substrate comprising a zeolite to make a monofunctional, non-acidic reforming catalyst. The catalyst substrate is contacted with an aqueous loading solution comprising noble metal cations and non-noble metal cations. The loading solution is formulated such that the equivalents of non-noble metal cations remaining in the catalyst not ionically bonded to the zeolite when loading is complete is 1.2 to 6.0 times the equivalents of non-noble metal cations displaced from the zeolite when the noble metal cations ion exchange into the zeolite, and simultaneously the endpoint pH of the loading solution is between 10.0 and 11.5. The required 1.2 to 6.0 ratio is achieved when the ratio of moles of non-noble metal cations added to the loading solution to moles of noble metal added to the loading solution is between 1 and 10.

Abstract: An exhaust gas purifying catalyst is constructed by laminating sequentially a first layer containing alumina, a second layer containing hydrocarbon adsorbent, and a third layer containing catalytic components on a monolithic support in which a cell sectional shape is a polygon. The second layer has a ratio Lmax/Lmin of a thickest portion (Lmax) at cell corner portions to a thinnest portion (Lmin) at cell flat portions in a range of 1 to 10, and has a thickness of 10 to 500 &mgr;m. The catalyst can achieve the purification of HC, CO, and NOx with good balance, and improve the purification performance of cold HC by controlling a diffusion speed of the exhaust gases that pass through cells in a support and diffuse into a coating layer.

Abstract: A hydrogenation catalyst including a carrier of ultrastable zeolite Y modified with at least one heavy rare earth element selected from ytterbium, gadolinium, terbium and dysprosium. At least one catalytic metal selected from palladium and platinum is supported on the carrier. A process for hydrogenating a feed containing an aromatic and/or a heterocyclic aromatic compound includes a step of contacting the feed with hydrogen in the presence of the above hydrogenation catalyst.

Abstract: A composite gel or aerogel is formed by commingling a particulate guest (such as a colloidal or dispersed (i.e., non-colloidal) solid or a powder) with a sol which is either about to gel or in which gelation has just started. After addition of the particulate, the mixture is then permitted to gel into a solid, gelled composite with open pores. This solid, gelled composite is then dried in a manner that prevents the collapse of open pores within the solid, gelled composite in which the gel acts as a “nanoglue” that holds the particles together.

Abstract: The present invention is directed to certain catalyst compositions and processes that are capable of reducing sulfur compounds normally found as part of the gasoline fraction streams of fluid catalytic cracking processes. The present invention requires an equilibrium cracking catalyst composition comprises at least one Y-type zeolite having kinetic conversion activity of at least about 3 in combination with a Lewis acid containing alumina composite present in at least 50 weight percent of the composition. The resultant equilibrium catalyst composition has a kinetic conversion activity of at least about 2.

Abstract: The invention pertains to a carrier composition comprising (a) at least 30 wt % of a synthetic cracking component, based on the total weight of the carrier composition, which comprises oxidic compounds of one or more trivalent metallic elements, tetravalent metallic elements, and divalent metallic elements, said cracking component comprising elemental clay platelets with an average diameter of 1 &mgr;m or less and an average degree of stacking of 20 platelets per stack or less, and/or comprising a cogel with a saponite content CA of less than 60 %, in which the total of sodium and potassium amounts to less than 1 wt %, based on the total weight of the cogel, and (b) 1 −25 wt % of a zeolite Y, based on the total weight of the carrier composition, with a unit cell size below 24.35 å. The invention further pertains to a catalyst comprising said carrier composition and at least a hydrogenation metal, and a process for converting heavy feedstock into middle distillates using said catalyst.

Abstract: There is provided, in a simple, rapid and efficient manner, a high purity, low silica X-type zeolite binderless shaped product with a high content of low silica X-type zeolite and high crystallinity, very high crush resistance and attrition resistance, and excellent adsorption performance. There is further provided an efficient gas separation method utilizing the high purity, low silica X-type zeolite binderless shaped product. With the high purity, low silica X-type zeolite binderless shaped product, the peak intensity of the faujasite zeolite at the index of 220 is stronger than the peak intensity at the index of 311 according to X-ray diffraction, and from approximately 60% to approximately 90% of the exchangeable cation sites are sodium while all or a portion of the remainder are potassium; the high purity, low silica X-type zeolite binderless shaped product also has all or a portion of the exchangeable cation sites are ion-exchanged with lithium.

Abstract: An improved method for preparing an adsorbent containing sheet is disclosed. Deionized water is employed in a slurry during preparation of the adsorbent containing sheet. The treated adsorbent monoliths provide improved sorption capacity and N2/O2 selectivity when employed in gas separation processes.

Abstract: The present invention is directed at a supported zeolite structure comprising substantially-sintered monolithic porous ceramic substrate having coated thereon a uniformly thin, essentially continuous zeolite crystal layer covering at least one surface and associated pores of the porous ceramic material. The zeolite crystal layer is comprised of a single layer of zeolite crystals and is free of any growth enhancing, selectivity enhancing, or reparation layer and exhibits an oriented structure whereby the crystals exhibit a substantially columnar cross-section. Preferably, the porous ceramic substrate support comprises, on an analyzed oxide basis, 10-90%, by weight alumina and exhibits a crystal phase assemblage selected from the group consisting of cordierite, mullite, alumina, and/or mixtures thereof. A method for forming a zeolite membrane disclosed herein is also provided.

Abstract: An AgX-type zeolite having a silver exchange level of 20-70% and a Ar/O2 Henry's law selectivity ratio at 23° C. of 1.05 or greater has an optimum combination of selectivity for argon over oxygen at lower cost than higher silver exchange levels. This material can be used in oxygen VSA/PSA processes to produce oxygen at purities above 97%.

Abstract: The invention relates to adsorbent materials having comparatively high intrinsic adsorption rates. Methods are disclosed whereby such rates can be achieved. In preferred embodiments, the adsorbent is a LiX zeolite material.

Abstract: A nitrogen adsorbent comprising a crystalline X zeolite having a faujasite structure with an SiO2/Al2O3 ratio of less than 3.0, wherein the crystal contains at least one trivalent element of the group consisting of Fe, B and Ga and (AlO4)5− tetrahedral units thereof associated with cations. Although the adsorbent contains a designated trivalent element in the zeolite, it maintains the number of cation sites contributing to adsorption, has an excellent separation performance of nitrogen and oxygen, and exhibits excellent heat resistance. Further, when the nitrogen adsorbent of the present invention is used in such a particular manner that it adsorbs nitrogen after being heated under a vacuum, adsorption performance is improved.

Abstract: A catalyst comprising 0.1-99.7% by weight of at least one alumina matrix; 0.1-80% by weight of at least one globally non dealuminated Y zeolite with a lattice parameter of more than 2.438 nm, a global SiO2/Al2O3 mole ratio of less than 8, and a framework SiO2/Al2O3 mole ratio of less than 21 and more than the global SiO2/Al2O3 mole ratio; 0.1-30% by weight of at least one group VIII metal and/or 1-40% by weight of at least one group VIB metal (% oxide); 0.1-20% by weight of at least one promoter element selected from the group formed by boron and silicon (% oxide); 0-20% by weight of at least one group VIIA element; 0-20% by weight of phosphorous (% oxide); 0.1-20% by weight of at least one group VIIB element, useful for hydrocracking processes, especially at low pressures of 7.5 to 11 MPa.

Abstract: The present invention relates to agglomerated zeolite adsorbents based on faujasite with an Si/Al ratio such that 1≦Si/Al≦1.15, at least 70% exchanged with barium and optionally with potassium, and on a binder, preferably a zeolitizable binder. They are obtained by agglomerating zeolite powder with a binder, followed by exchange of the zeolite ions for barium ions and activation of the adsorbents thus exchanged. These adsorbents are particularly suitable for the adsorption of the para-xylene contained in aromatic C8 hydrocarbon fractions in the liquid phase, in processes of simulated fluid-bed type.

Abstract: Zeolites exchanged with lithium cations and polyvalent cations are prepared by first partially ion-exchanging a sodium-containing zeolite, a potassium-containing zeolite or a sodium- and potassium-containing zeolite with polyvalent cations, then heat-treating the partially polyvalent cation-exchanged zeolite, then ion exchanging the heat-treated zeolite with ammonium cations, and then reacting the ammonium cation-exchanged zeolite with a water-soluble lithium compound under conditions which result in the removal of ammonia from the reaction zone.

Abstract: The invention relates to a catalyst that contains at least one partially amorphous Y zeolite, at least one metal of group VB, preferably niobium, at least one amorphous or poorly crystallized matrix, optionally at least one metal that is selected from group VIB and group VIII, optionally at least one element that is selected from the group that is formed by P, B, and Si, and optionally at least one element of group VIIA. The invention also relates to the use of this catalyst in hydrocracking and hydrorefining of hydrocarbon feedstocks.

Abstract: A catalyzed adsorber that is effective and durable in treating exhaust gas from internal combustion engines, and in particular, for adsorbing hydrocarbons contained in engine exhaust gas during cold start, releasing these hydrocarbons when the engine exhaust gas has heated the adsorber to normal operating temperature and catalyzing the conversion of these hydrocarbons to carbon dioxide and water. The catalyzed adsorber has a catalyst overlayer with a non-catalyst overcoat loading of about 1.0 g/in3 or less.

Abstract: An acidic amorphous silica-amumina has a large specific surface area and a large pore volume. A carrier complex and a hydrotreating catalyst containing acidic amorphous silica-alumina, in particular a hydrocracking catalyst containing acidic amorphous silica-alumina in combination with a modified zeolite-Y, treats petroleum hydrocarbon materials to produce middle distillates. The amorphous silica-alumina has a SiO2 content of 10-50 wt. %, a specific surface area of 300-600 m2/g, a pore volume of 0.8-1.5 ml/g and an IR acidity of 0.25-0.60 mmol/g. The catalyst shows a relatively high activity and mid-distillate selectivity and can be particularly used in hydrocracking process for producing mid-distillates with a higher yield.

Abstract: A method for removing trace moisture from a gas is disclosed. The method involves heating a zeolite having a high silica-to-alumina ratio to about 400° C. to remove physically adsorbed water from the zeolite, followed by heating the zeolite to a temperature in excess of 650° C., to form a superheated zeolite. The superheated zeolite is contacted with the gas, thereby adsorbing water from the gas. A dehydroxylated zeolite for removing trace moisture from a gas wherein the zeolite has a high silica-to-alumina ratio and a low level of metallic impurities is also disclosed. A method for removing metallic impurities from a gas using the low metals zeolite is also disclosed. The zeolites and methods of the invention are particularly useful for removing trace water and trace metal impurities from acid gases such as hydrogen chloride and hydrogen bromide.

Abstract: 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 complexing the metal cations, such as citric acid or a salt of this acid. The proportion of free cations in solution represents from 0.1% to 99%, preferably from 1 to 30%, of the total amount of the metal in the solution. The invention also relates to a process for the manufacture of zeolites X or A employing such an aqueous solution and the use of the zeolites thus obtained for separating, purifying or converting one or more constituents of a gas stream, such as air, synthesis gases or hydrocarbons, in particular olefins, by employing an adsorption process, in particular a PSA, VSA or TSA.

Abstract: An improved catalyst for edible oil hydrogenation produced by the incorporation of a sulphur adsorbing zeolite with a supported nickel hydrogenation catalyst. The zeolite is a cation-exchanged form of low silica faujasite with a silica to alumina ratio from about 1.8 to 2.1. The hydrogenation catalyst is a supported nickel catalyst. The zeolite is incorporated into the stabilization media with the reduced hydrogenation catalyst to form a physical blend of sulphur adsorbing zeolite and reduced nickel hydrogenation catalyst in a stabilization medium.

Abstract: The invention relates to a catalyst that contains at least one matrix, a partially amorphous Y zeolite, optionally at least one metal that is selected from the group that is formed by the metals of group VIB and group VIII of the periodic table, optionally at least one element that is selected from the group that is formed by phosphorus, boron and silicon, optionally at least one element of group VIIA, and optionally at least one element of group VIIB. The partially amorphous Y zeolite has a peak rate that is less than 0.4, and a crystalline fraction that is expressed relative to a reference zeolite in sodium form and that is less than 60%. The invention also relates to the use of this catalyst in hydroconversion, in particular hydrocracking and hydrorefining of hydrocarbon feedstocks.

Abstract: A catalyst composition suitable for reacting hydrocarbons, e.g., conversion processes such as fluidized catalytic cracking (FCC) of hydrocarbons, comprises attrition resistant particulate having a high level (30-85%) of stabilized zeolites having a constraint index of 1 to 12. The stabilized zeolite is bound by a phosphorous compound, alumina and optional binders wherein the alumina added to make the catalyst is about 10% by weight or less and the molar ratio of phosphorous (P2O5) to total alumina is sufficient to obtain an attrition index of about 20 or less. The composition can be used as a catalyst per se or as additive catalyst to a conventional catalyst and is especially suitable for enhancing yields of light olefins, and particularly ethylene, produced during conversion processes.

Abstract: A layered catalyst composition is disclosed where the composition is prepared by bonding an outer layer comprising a bound zeolite (e.g. zeolite beta) to an inner core material (e.g. cordierite). The use of an organic bonding agent in the catalyst preparation procedure provides a composition that is sufficiently resistant to mechanical attrition to be used commercially in aromatic alkylation processes (e.g. benzene alkylation to ethylbenzene). Advantages associated with the use of layered compositions include a significant reduction in the amount of zeolite used for a given reactor loading and improved selectivity to desired alkylated aromatic products. Further benefits are realized when the layered composition is formed into shapes having a sufficiently high void volume to reduce pressure drop across the alkylation catalyst bed. This is especially relevant for operation involving high recycle rates and consequently low alkylating agent concentrations in the reaction zone.

Abstract: A process for the preparation of nanostructured materials in high phase purities using cavitation is disclosed. The method comprises mixing a metal containing solution with a precipitating agent and passing the mixture into a cavitation chamber. The chamber consists of a first element to produce cavitation bubbles, and a second element that creates a pressure zone sufficient to collapse the bubbles. The process is useful for the preparation of mixed metal oxide catalysts and materials for piezoelectrics and superconductors.

Abstract: A catalyst composition is disclosed comprising a zeolite having a non-framework aluminum content of about less than 25 percent of the total aluminum content, a bulk silica:alumina ratio of about 6.5 to about 10.0 and a unit cell size ranging from about 2.440 to about 2.464 nm.

Abstract: A hydrocracking catalyst is provided that includes a crystalline molecular sieve material component having a faujasite structure and an alpha acidity of less than 1, preferably 0.3 or less, and a dispersed Group VIII noble metal component. The extremely low acidity allows selective hydrocracking of the aromatic and naphthenic species in a feedstock, while limiting the cracking of paraffins. The catalyst produces improved yields of products, such as diesel fuel, at high conversion rates and with high cetane values.

Abstract: This invention relates to a process for producing zeolite-bound FAU structure type zeolite having excellent mechanical strength and containing reduced amounts of zeolite P and the use of the zeolite-bound FAU structure type zeolites produced by the process. The zeolite-bound FAU structure type zeolite is prepared by converting the silica of a silica-bound FAU structure type aggregate in an aqueous mixture containing an effective amount of crown ether, e.g., 15-crown-5 and 18-crown-6, to suppress the formation of zeolite P and sufficient hydroxy ions to cause the silica to be converted to the zeolite. The zeolite-bound FAU structure type zeolite finds particular application in adsorption processes and hydrocarbon conversion processes such as catalytic cracking, hydrocracking, and reforming.

Abstract: A catalyst comprising 0.1-99.7% by weight of at least one alumina matrix; 0.1-80% by weight of at least one globally non dealuminated Y zeolite with a lattice parameter of more than 2.438 nm, a global SiO2/Al2O3 mole ratio of less than 8, and a framework SiO2/Al2O3 mole ratio of less than 21 and more than the global SiO2/Al2O3 mole ratio; 0.1-30% by weight of at least one group VIII metal and/or 1-40% by weight of at least one group VIB metal (% oxide); 0.1-20% by weight of at least one promoter element selected from the group formed by boron and silicon (% oxide); 0-20% by weight of at least one group VIIA element; 0-20% by weight of phosphorous (% oxide); 0.1-20% by weight of at least one group VIIB element, useful for hydrocracking processes, especially at low pressures of 7.5 to 11 MPa.

Abstract: A catalyst is provided that is capable of efficiently purifying NOx contained in a lean atmosphere containing moisture. The exhaust gas purifying catalyst contains a composition obtained by physically mixing a composite oxide containing zirconium and manganese and/or cobalt with a zeolite.