Abstract: The present invention provides an improved fluidized catalytic cracking process coupled with a two stage regeneration process in which the activity of the circulating catalyst is independently controlled for cracking hydrocarbon feedstocks or the vapors at low severity to produce maximum light cycle oil/distillate in one riser whilst cracking recycle streams comprising heavy cycle oil (HCO), light cracked naphtha (LCN) etc. in a second riser operating at high severity to produce LPG.

Abstract: In a process for producing a phosphorus-modified zeolite catalyst, zeolite crystals can be formed into a shaped catalyst body either in the absence of a separate inorganic oxide binder or in the presence of a separate inorganic oxide binder that is substantially free of aluminum. After converting the zeolite crystals to the hydrogen form and removing any organic directing agent employed in the synthesis of the zeolite crystals, the shaped catalyst body can be treated with an aqueous solution of a phosphorus compound, and the treated catalyst body can be heated to remove the water and to convert the phosphorus compound to an oxide form.

Abstract: The dual-zeolite catalyst for production of ethylbenzene is formed by mixing at least two different zeolites selected from mordenite, beta, ZSM-5, ZSM-11, ZSM-12, ZSM-22, ZSM-23, MFI topology zeolite, NES topology zeolite, EU-1, SAPO-5, SAPO-34, SAPO-11 and MAPO-36 zeolites and an inactive alumina binder. The two zeolites have different topology and possess dissimilar and unique physical and chemical characteristics, including particle size, surface area, pore size and acidity. The preferred amount of the two zeolites may range from 10 to 90 wt % of the total catalyst amount in the final dried and calcined form, preferably the zeolites are in equal parts by weight.

Abstract: The invention relates to a bound phosphorus-modified catalyst composition comprising a zeolite having a silica to alumina molar ratio of at least 40 and a binder having a surface area less than 200 m2/g, wherein the bound catalyst composition exhibits a mesopore size distribution with less than 20% of mesopores having a size below 10 nm before steaming in approximately 100% steam for about 96 hours at about 1000° F. (about 538° C.) and with more than 60% of mesopores having a size at least 21 nm after steaming in approximately 100% steam for about 96 hours at about 1000° F. (about 538° C.).

Abstract: A bound phosphorus-modified catalyst composition comprises a zeolite having a silica to alumina molar ratio of at least 40, phosphorus in an amount between about 0.1 wt % and about 3 wt % of the total catalyst composition, and a binder essentially free of aluminum. The bound catalyst composition can advantageously exhibit at least one of: (a) microporous surface area of at least 340 m2/g; (b) an alpha value after steaming in ˜100% steam for ˜96 hours at ˜1000° F. (˜538° C.) of at least 40; and (c) a coke deactivation rate constant<0.05 after steaming in ˜100% steam for ˜96 hours at ˜1000° F. (˜538° C.). The bound catalyst, as calcined, can advantageously also exhibit (i) 2,2-dimethylbutane diffusivity>˜1.5×10?2 sec?1 measured at ˜120° C. and ˜60 torr (˜8 kPa) and (ii) a coke deactivation rate constant<˜0.15.

Abstract: A catalyst composition that has superior attrition performance and a method that produces said catalyst composition to be used for fluid catalytic cracking processes to convert a heavy hydrocarbon fraction into mainly liquid fuels, particularly gasoline and light olefins. The catalyst composition has a moisture level or loss on ignition below 12 wt % and attrition rate below 3 wt. %/hr.

Abstract: The present invention relates to a method for producing a zeolite catalyst useful for aromatization of a lower alkane, a zeolite catalyst useful for aromatization of a lower alkane obtainable by said method and a process for aromatization of a lower alkane using the zeolite catalyst of the present invention.

Abstract: Additive particles for use in a fluid catalytic cracking system are provided for reducing the opacity of flue gas that is generated from a regenerator within the system. Particles are supplied to the unit to catalyze the cracking of hydrocarbon feeds, and to react with sulfur oxides that are produced during regeneration of catalysts supplied for the cracking reactions. At least a portion of the supplied particles include active particulates and a binder, with at least a portion of the active particulates being in a size range from 0.5 to 40 microns.

Abstract: A hydroisomerization catalyst according to the present invention is obtained by calcining a catalyst composite including an ion-exchanged molecular sieve or a calcined material thereof which is obtained by performing ion exchange of a molecular sieve containing an organic template in a solution containing a cation species and using water as a main solvent and at least one metal which is selected from a group consisting of metals belonging to Groups 8-10 of the Periodic Table of the Elements, molybdenum, and tungsten supported on the ion-exchanged molecular sieve or a calcined material thereof.

Abstract: A noble metal-containing titanosilicate material, characterized in that said material is represented with the oxide form of xTiO2.100SiO2.yEOm.zE, wherein x ranges from 0.001 to 50.0; (y+z) ranges from 0.0001 to 20.0 and y/z<5; E represents one or more noble metals selected from the group consisting of Ru, Rh, Pd, Re, Os, Ir, Pt, Ag and Au; m is a number satisfying the oxidation state of E. The crystal grains of said material contain a hollow structure, or a sagging structure. In said material, the synergistic effect between the noble metal and the titanosilicate are enhanced. As compared with the prior art, the selectivity, catalytic activity and stability of the reaction product are obviously increased in the oxidation reaction, e.g. the reaction for preparing propylene oxide by epoxidation of propylene.

Abstract: A process to prepare propylene showing desirably increased selectivity comprises contacting, at an elevated temperature, ethanol and a rhenium oxide-modified ZSM-5 zeolite catalyst, under conditions suitable to form propylene. The rhenium oxide-modified ZSM-5 zeolite catalyst may be prepared by impregnating, in an aqueous or organic medium, a ZSM-5 zeolite with a rhenium source, under conditions suitable to form a catalyst precursor, and calcining the catalyst precursor under conditions suitable to form a rhenium oxide-modified ZSM-5 zeolite catalyst.

Abstract: A honeycomb structure includes at least one honeycomb unit which includes walls. The walls have a thickness of from about 0.10 mm to about 0.50 mm and extend along a longitudinal direction of the honeycomb structure to define through-holes. The honeycomb structure has a center area inside a boundary line passing through positions located at substantially a half of a length from a center of the honeycomb structure to a periphery of the honeycomb structure in a cross section perpendicular to the longitudinal direction. The honeycomb structure has a peripheral area outside the boundary line. A thickness of the walls located in the peripheral area is larger than a thickness of the walls located in the center area. A first opening ratio in the center area in the cross section is larger than a second opening ratio in the peripheral area in the cross section.

Abstract: Provided are diesel exhaust components where palladium is segregated from a molecular sieve, specifically a zeolite, in a catalytic material. In the catalytic material, therefore, there are at least two layers: a palladium-containing layer that is substantially free of a molecular sieve and a hydrocarbon trap layer that comprises at least one molecular sieve and is substantially free of palladium. The palladium is provided on a high surface area, porous refractory metal oxide support. The catalytic material can further comprise a platinum component, where a minor amount of the platinum component is in the hydrocarbon trap layer, and a majority amount of the platinum component is in the palladium-containing layer. Systems and methods of using the same are also provided.

Abstract: An arrangement for aftertreatment of exhaust gas for lean-burn internal combustion engines such as diesel engines and Otto engines with direct injection has a NOx storage catalyzer installed in the exhaust gas train for reducing nitrogen oxides and at which nitrogen oxides are stored in lean operating phases and these stored nitrogen oxides are reduced in rich operating phases. At least one molecular sieve which keeps sulfur dioxide away from the at least one NOx storage catalyzer is arranged upstream of the NOx storage catalyzer.

Abstract: The present invention relates to a method for preparing substrate-molecular sieve layer complex by vising ultra-sound and apparatuses used therein, more particularly to a method for preparing substrate-molecular sieve layer complex by combining substrate, coupling compound and molecular sieve particle, wherein covalent, ionic, coordinate or hydrogen bond between a substrate and a coupling compound; molecular sieve particle and coupling compound; coupling compounds; coupling compound and intermediate coupling compound is induced by using 15 KHz-100 MHz of ultrasound instead of simple reflux to combine substrate and molecular sieve particles by various processes, further to reduce time and energy, to retain high binding velocity, binding strength, binding intensity and density remarkably, to attach molecular sieve particle uniformly onto all substrates combined with coupling compound selectively, even though substrate with coupling compound and substrate without coupling compound exist together; and apparatuses

Abstract: A metal-modified alkylation catalyst including a metal/zeolite is provided where the metal is one or two selected from the group consisting of yttrium and a rare earth of the lanthanide series other than cerium. Where two metals are used, one may be Ce or La. The metal-promoted zeolite is useful as a molecular sieve aromatic alkylation catalyst for the production of ethylbenzene by the ethylation of benzene in the liquid phase or critical phase. An alkylation product is produced containing ethylbenzene as a primary product with the attendant production of heavier alkylated by-products of no more than 10-60 wt % of the ethylbenzene.

Abstract: A honeycomb structure includes a honeycomb unit containing zeolite and an inorganic binder and having a plurality of cell walls to define a plurality of cells extending from a first end face to a second end face of the honeycomb unit along a longitudinal direction of the honeycomb unit. The honeycomb unit is manufactured by molding and firing raw material paste containing zeolite particles and the inorganic binder. The zeolite particles have a D50 of approximately 3.6 ?m or more. An average pore size of the cell walls is more than or equal to approximately 0.10 ?m and less than or equal to approximately 0.50 ?m. An average particle size of the cell walls is more than or equal to approximately 3.6 ?m and less than or equal to approximately 7.0 ?m.

Abstract: A catalyst for producing aromatic compounds from lower hydrocarbons while improving activity life stability of methane conversion rate; benzene formation rate; naphthalene formation rate; and total formation rate of benzene, toluene and xylene is formed by loading molybdenum and copper on metallo-silicate serving as a substrate and then calcining the metallo-silicate. When the catalyst is reacted with a reaction gas containing lower hydrocarbons and carbonic acid gas, aromatic compounds are produced. In order to obtain the catalyst, it is preferable that molybdenum and copper are loaded on zeolite formed of metallo-silicate after the zeolite is treated with a silane compound larger than a pore of the zeolite in diameter and having an amino group and a straight-chain hydrocarbon group, the amino group being able to selectively react with the zeolite at a Bronsted acid point of the zeolite. It is preferable that a loaded amount of molybdenum is within a range of from 2 to 12 wt.

Abstract: Methods and apparatus relate to processing of petroleum with a bed having a sorbent based diluent that the petroleum contacts upon passing through the bed. Magnetic properties of the sorbent and any other material, such as zeolite, used in the bed enable separation of such bed constituents based on a sulfided form of the sorbent being magnetic in contrast to a non-sulfided form of the sorbent being non-magnetic. Dividing the bed constituents into first and second portions by magnetic separation facilitates in selective replacing and/or regenerating the first portion independent of the second portion.

Abstract: An emission control catalyst that exhibits improved CO and HC reduction performance includes supported precious group metal catalysts that are coated onto different layers of the substrate for the emission control catalyst. Zeolites of one or more types are added to the emission control catalyst as a hydrocarbon absorbing component to boost the low temperature performance of the emission control catalyst. Y zeolite is used by itself or mixed with other zeolites to enhance hydrocarbon storage at low temperatures.

Abstract: A moisture adsorbing device 1 comprising a type Y zeolite, and an NOx adsorbing device 2 being put in place on an exhaust-gas downstream side of the moisture adsorbing device 1, and comprising a zeolite that includes a transition metal ion in the cation exchange sites are included. In NOx adsorbing apparatuses, since the less the moisture content in exhaust gases is the more the NOx adsorbing capability improves, the NO adsorbing capability in low-temperature region is improved especially by means of the combination with a moisture adsorbing device that comprises a type Y zeolite whose Al2O3 proportion is great and whose moisture adsorbing amount is great compared with the other zeolites.

Abstract: An object of the present invention is to provide a catalyst for hydrodesulfurization/dewaxing of a hydrocarbon oil, with which sulfur compounds in the hydrocarbon oil can be desulfurized to a high degree and which simultaneously is extremely effective in reducing the wax deposit content; a process for producing the catalyst; and a method of hydrotreatment with the catalyst. The invention relates to a catalyst for hydrodesulfurization/dewaxing of a hydrocarbon oil, comprising a support comprising an inorganic oxide containing at least one crystalline aluminosilicate having a one- or two-dimensional pore path system and, having provided thereon, 10 to 35% by mass of a metal in Group 6 of the Periodic Table, 1 to 10% by mass of a metal in Group 8 of the Periodic Table, and 1.

Abstract: The presently disclosed and claimed inventive concept(s) generally relates to a solid catalyst component comprising a zeolite with a modifier and at least one Group VIII meal alloyed with at least one transition metal. The presently disclosed and claimed inventive concept(s) further relates to a method of making the solid catalyst component and a process of converting mixed waste plastics into low molecular weight organic compounds using the solid catalyst component.

Abstract: There are provided a catalyst composition for producing hydrocarbons and a method for producing hydrocarbons which exhibit a high CO conversion rate, generates minimal amount of gaseous components, and is also capable of efficiently obtaining, from a syngas, a gasoline fraction which is selective for and rich in the components having a high octane number, such as aromatic, naphthenic, olefinic and branched paraffinic hydrocarbons, by using a Fischer-Tropsch synthesis catalyst that contains at least one type of metal exhibiting activity in Fischer-Tropsch reaction and manganese carbonate and a zeolite serving as a solid acid.

Abstract: A process is described for improving the quality as a fuel of hydrotreated hydrocarbon blends by reaction with hydrogen in the presence of a bifunctional catalytic system comprising one or more metals selected from Pt, Pd, Ir, Ru, Rh and Re, and a silico-aluminate of an acidic nature, selected from a micro-mesoporous silico-alumina and a zeolite belonging to the MTW family. The process of the invention produces an increase in the cetane index and a decrease in the density and T95.

Abstract: This invention provides for a method of making a spray-dried catalyst composition for use in any hydrocarbon conversion process. The particle size of the components is adjusted to improve the functionality of the catalyst for specific reactions. This invention also provides for a composite catalyst composition for use in any hydrocarbon conversion process that is dependent on the particle size.

Abstract: A process for producing a supported mesoporous and microporous material, comprises contacting a support with a template to produce a supported template, and contacting the supported template with one or more microporous material precursor to produce a supported microporous material-template composite, and subsequently removing the template from the supported microporous material-template composite to produce the supported mesoprous and microporous material. A composition comprising a supported mesoprous and microporous material produced by this process can be used for methane dehydroaromatization.

Abstract: In one embodiment, a catalyst composition comprises from about 5 weight percent to about 70 weight percent of silica-alumina; from about 30 weight percent to about 90 weight percent alumina; and from about 0.01 weight percent to about 2.0 weight percent of a group VIII metal. In another embodiment, a method for processing hydrocarbons comprises hydro-treating the hydrocarbons in the presence of a catalyst composition, wherein the catalyst comprises from about 5 weight percent to about 70 weight percent silica-alumina; from about 30 weight percent to about 90 weight percent alumina; and from about 0.01 weight percent to about 2.0 weight percent of a group VIII metal.

Abstract: A catalyst system is disclosed for catalytic pyrolysis of a solid biomass material. The system comprises an oxide, silicate or carbonate of a metal or a metalloid. The specific combined meso and macro surface area of the system is in the range of from 1 m2/g to 100 m2/g. When used in a catalytic process the system provides a high oil yield and a low coke yield. The liquid has a relatively low oxygen content.

Abstract: A catalyst is described which comprises at least one zeolite with structure type EUO, at least one zeolite selected from IM-5 zeolite and zeolites with structure type MFI, MOR, BEA and MTW, at least one group VIII metal, at least one group IIIA metal and at least one porous mineral matrix. The catalyst of the invention is used in a process for isomerizing a feed comprising aromatic compounds containing 8 carbon atoms per molecule.

Abstract: A catalyst for converting methane to aromatic hydrocarbons is described herein. The catalyst comprises an active metal or a compound thereof, and an inorganic oxide support wherein the active metal is added to the support in the form of metal oxalate. The metal oxalate-derived catalyst exhibits superior performance in the conversion of methane-rich feed to aromatics products relative to catalysts prepared from non-oxalate metal precursors. A method of making the catalyst and a method of using the catalyst are also described.

Abstract: A method for preparing a composite of zeolite-fiber substrate includes the steps of reacting a fiber substrate or a zeolite with a linking compound to form an intermediate of linking compound-fiber substrate or zeolite-linking compound, and preparing the composite of zeolite-linking compound-fiber substrate by linking the intermediate of linking compound-fiber substrate to the fiber substrate or linking the intermediate of zeolite-linking compound to the zeolite, in which the linking is induced by sonication.

Abstract: Extruded honeycomb catalyst bodies and methods of manufacturing same. The catalyst body includes a first oxide selected from the group consisting of tungsten oxides, vanadium oxides, and combinations thereof, a second oxide selected from the group consisting of cerium oxides, lanthanum oxides, zirconium oxides, and combinations thereof, and a zeolite.

Abstract: A catalyst for the hydrogenation, hydroisomerisation, hydrocracking and/or hydrodesulfurisation, of hydrocarbon feedstocks, the catalyst consisting of a substantially binder free bead type support material obtained through a sol-gel method, and a catalytically active component selected from precious metals, the support comprising 5 to 50 wt. % of at least one molecular sieve material and 50 to 95 wt. % of silica-alumina.

Abstract: The present invention is for a catalyst, a process for making the catalyst and a process for using the catalyst in aromatization of alkanes having three to five carbon atoms per molecule, such as propane, to aromatics, such as benzene, toluene and xylene. The catalyst is an aluminum-silicon zeolite having a silicon to aluminum atomic ratio (Si:Al) greater than 15:1, such as MFI or ZSM-5, on which germanium, aluminum and a noble metal, such as platinum, have been deposited. The catalyst may be bound with magnesia, alumina, titania, zirconia, thoria, silica, boria or mixtures thereof. The aluminum and germanium may be deposited simultaneously on the zeolite.

Abstract: The present invention relates to a catalyst composition for the reaction of hydrocarbons comprising a zeolite with has a faujasite structure and a fibrous zeolite which comprises essentially non-crossing one-dimensional channels. Further, the catalyst composition comprises in a preferred embodiment a metal component selected from metals of the group VIB and VIII of the periodic table of elements and their compounds. The invention relates further to a process for the synthesis of such a catalyst composition and to a process for hydrocracking hydrocarbon feedstocks by using said catalyst composition.

Abstract: A catalyst comprising a zeolite loaded with copper ions and at least one trivalent metal ion other than Al+3, wherein the catalyst decreases NOx emissions in diesel exhaust. The trivalent metal ions are selected from, for example, trivalent transition metal ions, trivalent main group metal ions, and/or trivalent lanthanide metal ions. In particular embodiments, the catalysts are selected from Cu—Fe-ZSM5, Cu—La-ZSM-5, Fe—Cu—La-ZSM5, Cu—Sc-ZSM-5, and Cu—In-ZSM5. The catalysts are placed on refractory support materials and incorporated into catalytic converters.

Abstract: One aspect of the present invention relates to mesostructured zeolites. The invention also relates to a method of preparing mesostructured zeolites, as well as using them as cracking catalysts for organic compounds and degradation catalysts for polymers.

Abstract: Embodiments of an invention disclosed herein relate to particles made from zeolite catalysts and their use in oligomerization processes. In particular, shaped particles (for example, spheroid particles) are made from compositions including the contact product of at least one zeolite catalyst and at least one binder.

Abstract: Described is a copper containing ZSM-34, OFF and/or ERI zeolitic material having a silica to alumina mole ratio ranging from about 4 to about 50 and a copper content, reported as CuO, ranging from about 1 to about 10 wt.-%, based on the total weight of the calcined zeolitic material, and having an alkali metal content, reported as the metal oxide, ranging from about 0.7 to about 1.5 wt.-%, wherein the 750° C.-aged copper containing ZSM-34, OFF and/or ERI zeolitic material exhibits NO conversion at 200° C. of at least about 75% and at 450° C. of at least about 90%, measured at a gas hourly volume based space velocity of 30000 h?1 under steady state conditions at maximum NH3-slip conditions in a gas mixture of 500 ppm NO, 500 ppm NH3, 10% O2, 5% H2O, balance N2.

Abstract: Described is a copper containing ZSM-34, OFF and/or ERI zeolitic material having a silica to alumina mole ratio ranging from about 4 to about 50 and a copper content, reported as CuO, ranging from about 1 to about 10 wt.-%, based on the total weight of the calcined zeolitic material, and having an alkali metal content, reported as metal oxide, ranging from about 1.5 to about 12 wt.-%.

Abstract: Described is a copper containing ZSM-34, OFF and/or ERI zeolitic material having a silica to alumina mole ratio ranging from about 4 to about 50 and a copper content, reported as CuO, ranging from about 1 to about 10 wt.-%, based on the total weight of the calcined zeolitic material, and having an alkali metal content, reported as the metal oxide, of less than about 0.7 wt.-%.

Abstract: A xylene isomerization process includes introducing gas comprising hydrogen and a base to a reaction zone in which a catalyst comprising a Group VIII metal and a zeolite support resides. In one embodiment, the base may be formed in situ within the reaction zone from nitrogen and hydrogen that are introduced to the reaction zone. In another embodiment, the base is introduced directly to the reaction zone. The conditions in the reaction zone are effective to reduce the catalyst. A stream comprising C8 aromatics, e.g., xylenes and ethylbenzene may then be fed to the reaction zone containing the reduced catalyst. The reaction zone may be operated at conditions effective to isomerize the xylenes and hydrodealkylate the ethylbenzene. The xylene loss during the isomerization of the xylenes is lowered as a result of using the catalyst reduced in the presence of the gas comprising a base and hydrogen.

Abstract: The present invention relates to a catalyst including a ceramic structure containing porous ceramic paper and a catalyst component supported on the ceramic structure, and to a method for removing formaldehyde using the catalyst. The present invention provides a catalyst in which a structure made of ceramic paper having excellent characteristics in terms of porosity, specific surface area, and the like is used as a support for the catalyst component to maximize an effective area for reacting the supported catalyst component with a substance to be treated, thereby improving catalyst performance. The present invention also provides a method of using the catalyst.

Abstract: A method of manufacturing a catalyst body which includes: soaking at least part of a fired zeolite-based body in a transition metal oxide solution; removing the body from the transition metal oxide solution; exposing the body to a humidified atmosphere at one or more temperatures above 20° C.; then drying the body; and calcining the body.

Abstract: A zeolite catalyst that may be used in aromatic alkylation is prepared by treating a zeolite with a phosphorus compound. The phosphorus-treated zeolite is calcined and contacted with liquid water, whereby an amount of phosphorus is removed from the phosphorus-treated zeolite. The phosphorus-treated zeolite is then heated. A method of preparing an aromatic product may also be carried out by contacting the prepared zeolite catalyst with an aromatic alkylation feed of an aromatic compound and an alkylating agent under reaction conditions suitable for aromatic alkylation.

Abstract: The alkylation of aromatic compound with acyclic mono-olefin is effected at low aromatic compound to mono-olefin ratios with reduced co-production of heavies. In the processes a small crystal, acidic FAU molecular sieve is used as a catalyst under alkylation conditions. This invention also relates to catalysts containing small crystal, acidic FAU molecular sieve and at least one other acidic catalytic component.

Abstract: The catalytic behaviour of vanadia-supported zeolite catalysts with different SiO2/Al2O3 ratios was tested for the SCR of NO with ammonia. The SCR activity was found to be directly correlated to the total acidity of the catalysts. On the surface of these zeolites the V2O5 was highly dispersed and amorphous in nature. After the impregnation with vanadium and subsequent poisoning with potassium oxide not much change in micro-pore structure of HZSM5 was observed by N2 adsorption studies. Interestingly, potassium-doped HZSM5 and HMORDENITE catalysts showed high resistance to deactivation because of the unique nature of the material exhibiting higher surface area and acidity than the conventional V2O5—WOx/ZrO2 or TiO2 catalysts. Consequently, a possible application of these alkali-tolerant SCR catalysts in biomass fired power plants can be envisaged.

Abstract: A first hydroisomerization catalyst contains a support being a extruded product prepared by calcination having a thermal treatment that includes thermally treating at 350° C. or more and at least one metal supported on the support and selected from the group consisting of metals belonging to Groups 8 to 10 of the periodic table, molybdenum and tungsten, wherein the support contains (a1) a calcined zeolite prepared by calcination having a thermal treatment that includes thermally treating at 350° C. or more of an ion-exchanged zeolite obtained by ion exchange of an organic template-containing zeolite containing an organic template and having a 10-membered ring one-dimensional porous structure in a solution containing ammonium ions and/or protons, and (b1) a calcined inorganic oxide prepared by calcination having a thermal treatment that includes thermally treating at 350° C.

Abstract: The invention concerns a xylenes isomerization process for the production of equilibrium or near-equilibrium xylenes. The process utilizes a catalyst comprising HZSM-5 or MCM-49 and process conditions including a temperature of less than 295° C. and a pressure sufficient to maintain the xylenes in liquid phase. In embodiments, the process can be operated in a continuous mode with ppm levels of dissolved H2 in the feed and in other embodiments in a cyclic mode without the H2 in feed but with periodic regenerations using a feed having low ppm levels of H2.