45results about "Molecular sieve catalysts" patented technology

A catalytic composition is described for the alkylation and/or transalkylation of aromatic hydrocarbons consisting of beta zeolite, as such or modified by the isomorphous substitution of aluminum with boron, iron or gallium or by the introduction of alkaline and/or earth alkaline metals following an ion-exchange process, and an inorganic ligand, wherein the extrazeolite porosity, i.e. the porosity obtained by adding the mesoporosity and macroporosity fractions present in the catalytic composition itself, is such that a fraction of at least 25% is composed of pores with a radius higher than 100 ANGSTROM , said composition being characterized by a total volume of extrazeolitic pores greater than or equal to 0.80 ml/g.

A cracking catalyst contains a substantially inert core and an active shell, the active shell containing a zeolite catalyst and a matrix. Methods of making and using the cracking catalyst are also described.

This invention relates to the synthesis of large pore composite molecular sieves and to the synthetic large pore composite molecular sieves so produced. The molecular sieves of the invention have the same general utilities of the comparable molecular sieves of the prior art but have been found to be superior catalysts and absorbents. This invention relates to a hydrothermal synthesis of large pore molecular sieves from nutrients, at least one of which contains an amorphous framework-structure, and which framework-structure is essentially retained in the synthetic molecular sieve. This invention stems from a discovery that the intrinsic porosity characteristics of a nutrient that possesses an amorphous cation oxide-framework can be substantially retained in the final molecular sieve containing product formed by a hydrothermal process by carefully controlling the conditions under which the hydrothermal process is conducted. For example, the invention contemplates retention of the particle size in a final molecular sieve-containing product that corresponds with that of an amorphous cation oxide-framework nutrient used in its manufacture. This invention drives the selection of process conditions to achieve one or more of macro and meso porosity ("large pore composite porosity") in the final molecular sieve product as a direct product of the hydrothermal reaction producing the molecular sieve. The invention allows the production of a molecular sieve that is in situ incorporated in the framework morphology of a solid cation oxide-framework used in the molecular sieve's manufacture.

The invention discloses a dehydrogenation catalyst for light alkanes and a preparation method thereof. Aluminum oxide doped with ZSM-5 molecular sieve is used as a carrier; the catalyst comprises the following components based on the weight of the carrier: 20-50% of ZSM-5 molecular sieve, 0.1-5% of Sn, 0.1-2% of Pt, and 0.5-3% of K. The preparation method of the catalyst comprises the following steps: (1) the ZSM-5 molecular sieve, aluminum oxide, sesbania powder and a dilute nitric acid solution are mixed, pulping, mixing and kneading, band extrusion, drying, and roasting are carried out, and the aluminum oxide carrier doped with ZSM-5 molecular sieve is obtained; (2) the active component Pt as well as the catalysis-assisting components Sn and K are loaded on the carrier obtained in the step (1) by dipping, drying and calcination are carried out, and the dehydrogenation catalyst is obtained. The catalyst has the advantages of high alkane transformation efficiency, good alkene selectivity and good stability in the dehydrogenation reaction of light alkanes.

The invention discloses a catalyst used for preparing lower olefins through the catalytic cracking process of a fluidized bed, and the catalyst comprises an active component molecular sieve and a matrix, wherein, the matrix is nonstoichiometric aluminium phosphate or the nonstoichiometric aluminium phosphate doped with a silicon-containing compound; the chemical composition of the matrix is as follows: P/Al is equal to 0.01-0.9, and Si/Al is equal to 0-50. The molecular sieve and the matrix are mixed for beating; then residual oil, animal and vegetable oil as well as naphtha can be made through spray drying and calcination; and the catalytic pyrolysis is carried out to prepare the lower olefins catalyst. The catalyst of the invention takes the residual oil, the animal and vegetable oil aswell as the naphtha as the raw materials, and uses the catalytic pyrolysis process to prepare the lower olefins, thereby opening up the new material source and the technological line for producing olefin, and having higher economic benefits.

A catalytic cracking catalyst containing Y-type molecular sieve and a preparation method thereof. The invention provides a catalytic cracking catalyst containing high-stability small-grain Y-type molecular sieve and a preparation method thereof. Preparation of the high-stability small-grain Y-type molecular sieve employs an improved guiding agent containing a surfactant. The method provided by the invention can effectively and conveniently prepare the high-stability small-grain Y-type molecular sieve and the catalytic cracking catalyst. Compared with the prior art, the catalytic cracking catalyst has enough high catalytic activity.

The invention relates to a Y-type molecular sieve-containing hydrocracking catalyst carrier and a preparation method thereof. The carrier consists of a modified Y-type molecular sieve and alumina, wherein the Y-type molecular sieve is obtained by the treatment by mixed aqueous solution of an aluminum salt and an acid and by hydrothermal treatment and has the properties of a specific surface of between 750 and 850m<2>/g, a total pore volume of between 0.35 and 0.48ml/g, a relative crystallinity of between 90 and 130 percent, a cell parameter of between 2.437 and 2.445nm, a silicon to aluminum molar ratio of between 15 and 70, an infrared acidity of between 0.5 and 1.0 mmol/g, a Bronsted acid to Lewis acid ratio of more than 7.0 and a sodium oxide content of less than or equal to 0.05 weight percent. The carrier can be used in the preparation of a hydrocracking catalyst, and the obtained catalyst has the characteristics of excellent catalytic activity, high heavy naphtha selectivity, high yield, high aromatic hydrocarbon potential content of the heavy naphtha and the like.

The invention discloses a copper and iron compound honeycomb coating type denitrification catalyst as well as a preparation method and application thereof. The catalyst provided by the invention takesa copper-based molecular sieve prepared through an ion exchange method or an immersion method as an active component, ferric polysilicate is added as a co-catalysis component, a honeycomb cordieriteceramic block is used as a carrier and an aluminum sol is used as as a binder. The catalyst prepared by the invention is prepared through a vacuum coating method; the preparation method is simple to operate, holes are not liable to block in a coating process and large-scale production is easy to realize; a coating has a large capacity and the coating fastness of active components is high; a good cooperative catalysis effect is formed between duplex metal including copper and iron, the denitrification activity of the catalyst is improved and the anti-H2O performance and anti-SO2 performance ofthe catalyst are also improved. The catalyst provided by the invention has a denitrification efficiency of 90 percent or more in a range of 220 to 510 DEG C and has a good application prospect in a stationary source denitrification direction.

The invention relates to the field of photocatalysis, and particularly relates to a visible-light-driven photocatalyst for degrading dye in wastewater, and preparation and application thereof. The visible-light-driven photocatalyst for degrading dye in wastewater is characterized in that mesoporous silicon dioxide of which the framework contains Ti atoms is used as a carrier, the mesoporous silicon dioxide carrier carries graphitic carbon nitride, and bivalent Cu ions are doped on the graphitic carbon nitride, wherein the graphitic carbon nitride with the doped cupric ions serves as a main catalyst, and the element Ti serves as a cocatalyst. The Ti atoms contained in the framework of the mesoporous silicon dioxide directly react with H2O2 in a photo-Fenton-like system to produce hydroxyl free radicals, thereby obviously improving the photo-Fenton-like reaction activity. The photocatalyst provided by the invention catalyzes degradation of methyl orange and/or rhodamine B in wastewater, and degradation can be performed at room temperature under the irradiation of visible light, thereby enabling the photocatalyst to have the advantages of mild reaction conditions, low cost and easy implementation; and the photocatalyst can be easily regenerated, and still has excellent photocatalytic performance after being regenerated many times.

The invention discloses a phosphor-doped CHA molecular sieve, and a preparation method and application thereof, and belongs to the field of zeolite molecular sieve preparation technology and application. The preparation method is characterized by comprising the following steps: mixing a silicon source, an aluminum source, sodium hydroxide, potassium hydroxide, SAPO-18, AlPO-18 or SAPO-34 seed crystal and distilled water to form uniform gel; performing hydrothermal crystallization, performing washing and drying after performing solid-liquid separation on a crystallized product, thereby obtaining the phosphor-doped CHA molecular sieve which can perform ammonia gas selective catalytic reduction denitration catalysis after being loaded with Cu<2+>. Addition of seed crystal such as SAPO-18 is akey factor for generating the phosphor-doped CHA molecular sieve. The method can be used for preparing the phosphor-doped CHA molecular sieve with high degree of crystallinity under a conventional hydro-thermal synthesis condition, so that ammonia gas selective catalytic reduction denitration (NH3-SCR) low-temperature activity is good.

The invention relates to a high-temperature iron-based zeolite molecular sieve honeycomb type denitration catalyst and a preparation method thereof, and belongs to the technical field of atmospheric pollution treatment technologies and environmentally friendly catalyzing materials. The preparation method comprises the following steps: mixing ferrous salts with ferrite; synthesizing a zeolite molecular sieve, natural zeolite molecular sieve powder, attapulgite clay or kaolin, glass fibers, an organic binding agent, wood pulp or sesbania cannabina powder, stearic acid and glycerinum; and carrying out mixing, ageing, extrusion forming, drying and roasting to obtain the iron-based zeolite molecular sieve honeycomb type denitration catalyst. According to the catalyst, the zeolite molecular sieve and natural raw mineral materials which have excellent thermal stability are used as carriers, and the running stability, the sintering resistance and the mechanical strength of the catalyst in a high-temperature environment are improved. The obtained honeycomb type denitration catalyst has good water resistance and sulfur poisoning resistance, and the conversion ratio of oxynitride is greater than 90% under the conditions that the temperature is in the high-temperature range of 400-600 DEG C and the air speed is 10,000 h<-1>.

The invention relates to a method of filter separator of superfine molecular sieve and mother liquor recovery, comprising: firstly, the superfine molecular sieve seriflux is intensively mixed and pulp uniformly in the storage tank; the superfine molecular sieve seriflux is fed into the filter unit specially designed by the pump; the superfine molecular sieve seriflux is filtrated through the filter unit and then the filtrate flows into to the collecting tank; lastly, the seriflux concentrated flows back into the storage tank; the said filter unit accepts the superfine molecular sieve seriflux to do rapid turbulent motion in the channel with filter cloth where a layer of thin filter cake is formed, and liquid of the superfine molecular seriflux infiltrates out perpendicularly through the thin filter cake and the filter cloth to form perpendicular interlacing between the flow direction of superfine molecular sieve seriflux and that of the filtrate; the filtrate is connected as the mother liquor after flowing into the connecting tank. The method for filtrating using the cross-flow type thin filter cake, is capable of executing liquid-solid separation of superfine molecular sieve, especially for the high viscosity superfine molecular sieve, and recovery of the uperfine molecular sieve mother liquor is capable of reducing the cost of molecular sieve effectively, and abating the pollution to environment.

The invention discloses a wear-resistant heavy oil catalytic cracking catalyst capable of reducing sulfur content of gasoline. Based on the total mass of the catalyst, the wear-resistant heavy oil catalytic cracking catalyst comprises not less than 15 mass percent of mullite, 0.05-20 mass percent of vanadium in terms of vanadium element and 15-50 mass percent of Y-type molecular sieve. The wear-resistant heavy oil catalytic cracking catalyst is prepared by taking mullite microspheres, which are synthesized at low temperature by taking a large amount of vanadium-containing compound as a phase change auxiliary agent, as a raw material, performing in-situ crystallization on the microspheres to synthesize a NaY molecular sieve, modifying and exchanging. The wear-resistant heavy oil catalytic cracking catalyst has rich middle pores and macropores, is strong in wear resistance, can reduce the sulfur content of the gasoline in a catalytic cracking process and has an excellent heavy oil cracking function.

The present invention relates to a novel nickel catalyst. The present invention also relates to a process for the preparation of an improved nickel catalyst. The present invention also relates to a process for hydrogenation of m-dinitro benzene to m-phenylene diamine using the said improved catalyst. More particularly the present invention relates to a process involving hydrogenation of m-dinitrobenzene to m phenylene diamine in the presence of a supported bimetallic platinum catalyst, using methanol as a solvent. The catalyst system consisting of one metal selected from platinum group and other nickel supported on either carbon or alumina or silica or zeolite. The catalyst of the present invention is a bimetallic catalyst prepared by precipitation and impregnation technique at very specific preparation conditions.

The invention relates to a preparation method for a silicon-phosphorus-aluminum SAPO molecular sieve with a layered structure to mainly overcome the problem of difficulty to obtain an SAPO molecular sieve with a hierarchical-pore structure in the prior art. According to a technical scheme of the invention, the method comprises the following steps: subjecting a mixture of a structure-directing agent R1, water, an organic template agent R2, a phosphorus source, an aluminum source and an alkali-treated silicon source to hydrolyzing under the condition of minus 20 DEG C to 100 DEG C so as to obtain a sol, then placing the obtained sol in a reaction vessel, and carrying out crystallization; and after crystallization is completed, subjecting an obtained sample to washing, drying and calcining so as to obtain the SAPO molecular sieve with the layered structure. Thus, the above-mentioned problem is well solved, and the method can be applied in industrial production of the molecular sieve with the hierarchical-pore structure.

The invention discloses a preparation method for a supported Mo-based oxidation desulfurization catalyst, and belongs to the technical fields of coal processing, petroleum processing and petrochemical processing, and relates to a preparation method for a solid catalyst for oxidative removal of distillate oil and sulphide-containing thiophene aromatic heterocyclic compounds in the chemical materials. The method is characterized by: loading an organic acid on a porous carrier-supported Mo-based oxide catalyst, then drying at a temperature of 70-120 DEG C; heating to the temperature of 100-180 DEG C in the protection of inert gas, and holding for 1-5 hours, wherein the heating rate is 1-10 DEG C per minute; then heating to the temperature of 200-260 DEG C and holding for 1-5 hours, wherein the heating rate is 1-10 DEG C per minute; then heating to the temperature of 300-340 DEG C and holding for 1-5 hours, wherein the heating rate is 1-10 DEG C per minute to prepare the catalyst. The mixture comprising Mo<6+> and low valence state Mo<5+> is loaded on the surface of the catalyst. With the present invention, the oxidation activity and the desulfurization activity of the supported Mo-based catalyst provided by the present invention can be significantly improved, and a wide application prospect in the field of deep desulfurization is provided.

The invention discloses a double-component modification method of a molecular sieve in an FCC catalyst. The modification method comprises the following steps that 1, the molecular sieve is added intoa phosphorus-containing aqueous solution, wherein the mass ratio of the phosphorus-containing aqueous solution to the molecular sieve is (2-5):1; the pH value is adjusted to be 1-10, a stirring reaction is carried out at 70-200 DEG C, then flash drying is carried out, and a filter cake is roasted for 0.5-6 hours at 180-650 DEG C by using 0-100% water vapor to obtain a phosphorus modified molecularsieve; 2, the phosphorus modified molecular sieve is added into a transition metal aqueous solution, wherein the mass ratio of the transition metal aqueous solution to the molecular sieve is (2-10):1; a stirring reaction is carried out at the temperature of 0-100 DEG C, then flash drying and roasting are carried out, and a double-component modified molecular sieve is obtained, wherein the concentration of the phosphorus-containing aqueous solution is 0.1-1 mol/L, and the concentration of the metal iron aqueous solution is 0.01-0.1 mol/L. The method can prevent the great loss of the phosphoruscomponent of the phosphorus modified molecular sieve in transition metal exchange modification, and the acid amount of molecular sieve strong acid is improved.

A mesostructured aluminosilicate material is described, which consists of at least two elementary spherical particles, each one of said spherical particles consisting of a matrix based on silicon oxide and aluminium oxide, said matrix having a pore diameter ranging between 1.5 and 30 nm, a Si/Al molar ratio at least equal to 1 and amorphous walls of thickness ranging between 1 and 30 nm, said elementary spherical particles having a diameter D such that 10<D(μm)≦100. A method of preparing said material and its application in the spheres of refining and petrochemistry are also described.

The invention provides an n-alkene isomerization catalyst. The catalyst contains 50-90% (by mass) of a molecular sieve and the balance aluminum oxide; the molecular sieve is composed of SAPO-11 and ZSM-5, wherein SAPO-11 accounts for 75-90% (by mass) of the total mass of the molecular sieve, and ZSM-5 accounts for 10-25% (by mass) of the total mass of the molecular sieve; the microparticle size of the molecular sieve in the catalyst is 1-2 micrometers. The catalyst has high n-alkene isomerization activity, the isoalkene yield is high and can be maintained for a long time, a long one-way running cycle is achieved, the decreasing amplitude of regeneration performance obtained after multiple times of scorching is small, and the catalyst is suitable for the process of preparing isobutene from n-butene through an isomerization reaction and the process of preparing isopentene from n-pentene through an isomerization reaction and particularly suitable for the process of preparing isobutene through post-etherification C4 n-butene isomerization.

The present, invention relates to a process for the production of additives for catalysts for fluid catalytic cracking (FCC) based on zeolite that is selective for light olefins, with the aim of increasing the yields, in FCC units, of liquefied petroleum gas (LPG) and light olefins, of high added value, among others propene and isobutene. This invention provides a method of preparation of catalytic compositions, starting from zeolite modified with phosphate and alkaline-earth metal, that leads to the production of an additive with better performance than the additives, of similar compositions, obtained by other methods of the prior art. The process can be regarded as a development in relation to other processes, as it promotes interaction between the zeolite that is selective for light olefins and its activator, reagent “X”. For this, a separate stage is used during the sequence of stages in the preparation. Moreover, the zeolite does not undergo additional treatments such as filtration, washing or calcination after the treatment with its activator.

This additive can be obtained starting from any commercial zeolite that is selective for light olefins, such as zeolite of type ZSM-5.

The invention relates to a catalyst for pyrolysis C9 two-stage hydrogenation and a preparation method thereof. The catalyst is prepared by taking a K and Ru modified composite oxide consisting of an HY molecular sieve, B2O3 and Al2O3 as a carrier and loading active components of Ni and Mo. The catalyst comprises the following active components in percentage by weight: 3.0-5.0% of NiO and 9.0-15.0% of MoO3. The catalyst provided by the invention is used for pyrolysis C9 two-stage hydrogenation, shows very high desulfurization activity and olefin saturation capacity, is strong in carbon deposition resistance and has a certain effect on macromolecular colloid pyrolysis, so that the colloid resistance of the catalyst is improved, and the service life of the catalyst is greatly prolonged.

The invention discloses a preparation method of a catalyst for methyl difluoroacetate hydrogenation to produce difluoroethanol. The method comprises the following specific steps: first adding vanadic anhydride and NbCl3 by weight into an alkali solution, adding with heating and stirring polypropylene glycol and tetraethoxysilane, continuing stirring for 20-30 min, filtering the precipitate, rinsing with deionized water, drying, adding the dried solid with potassium oxide, calcium tungstate, zinc oxide and zeolite powder together into a saturated solution of calcium chloride, stirring to mix well, heating up to 50-60 DEG C, adding a potassium permanganate solution, stirring for 1-2 h, cooling to room temperature, filtering out the precipitate, cleaning with deionized water, and then sintering at 600-700 DEG C, cleaning the cured substances after sintering with deionized water, and drying to constant weight. The catalyst prepared by the invention has high efficiency catalysis capability and catalysis stability under normal pressure.

The invention discloses a monolithic catalyst with organic waste gas selective adsorption and catalytic oxidation functions, a preparation method of the monolithic catalyst and application of the monolithic catalyst in catalytic oxidation treatment of organic waste gas. A double-coating design is adopted. A first coating is a molecular sieve substrate coating, and ensures the coating firmness between a molecular sieve and a cordierite carrier. A second coating is an active component coating, and neutral silica sol is adopted to protect the activity and effectiveness of noble metals and catalytic additives on the molecular sieve. The surface coating layer of the obtained monolithic catalyst is high in loading rate, good in firmness and low in falling rate, the mechanical strength of the obtained monolithic catalyst is remarkably improved, and the service life of the obtained monolithic catalyst is remarkably prolonged. The monolithic catalyst provided by the invention can selectively adsorb VOCs and rapidly desorb generated H2O at the same time, so that the reaction is promoted to be carried out towards the catalytic oxidation direction of VOCs, and the monolithic catalyst has excellent catalytic oxidation performance for VOCs.