662results about How to "High hydrothermal stability" patented technology

The invention discloses a preparation method for a Beta zeolite molecular sieve with a hierarchical porous structure. Ethyl orthosilicate is used as a silicon source, sodium metaaluminate is used as an aluminum source, hexaammonio cationic quaternary ammonium surfactant is used as a template, and then the hierarchical porous zeolite molecular sieve containing meso pores and Beta zeolite micropores is prepared by using a hydro-thermal synthesis process under an alkaline condition. According to the invention, the hexaammonio cationic quaternary ammonium surfactant is used as a Beta zeolite structure guiding agent and generates micropores, aggregation of hydrophobic long-chain alkyl groups on the surfactant forms the meso pores, so the prepared Beta zeolite molecular sieve has both meso pores and the crystalline micropores. The structure with both the meso pores and the micropores enables defects of a single pore structure to be avoided and mass transfer efficiency to be improved, and the Beta zeolite molecular sieve has a wide application prospect in aspects of macro-molecular catalysis, adsorption, separation, etc.

The invention discloses a nano ZSM-5 molecular sieve based catalyst and preparation and use methods. The molecular sieve catalyst consists of molecular sieves and metal components, wherein the molecular sieves are nano ZSM-5 molecular sieves with a short b-axis, a medium high silica-alumina ratio, less strong acid, high Lewis acid content, and resistance to hydrothermal deactivation. The preparation method is as follows: mixing a silicon source, an aluminum source, a template agent, a structure promoter, an additive and alkali with water, and stirring to prepare a precursor solution, then crystallizing, separating solid from liquid, and calcinating to obtain molecular sieve raw powder; mixing the molecular sieve raw powder with an ammonium salt solution, stirring, filtering, mixing with the ammonium salt solution for several times, stirring, filtering, and calcinating to obtain hydrogen-type ZSM-5 molecular sieves; mixing with the metal precursor solution, drying and calcinating to obtain the aromatization catalyst. The use method is as follows: transforming oxy-compound raw materials to aromatic hydrocarbon through the catalyst under the reaction conditions. The nano ZSM-5 molecular sieve based catalyst has the characteristics of being high in aromatics yield (reaching up to 99%) and long in service life (the catalyst is alive after 300 hours, and the aromatics selectivity reaches up to 70% after the catalyst is subjected to hydrothermal aging at 760 DEG C for 4 hours).

The invention provides a molecular sieve catalyst for preparing low-carbon olefin, and the catalyst comprises the following raw materials by parts by weight: 30-93.7 parts of Na-ZSM-5 zeolite, 5-40 parts of bonding agent, 0.1-10 parts of modifier of mixed elements, 1-15 parts of hole structure regulator and 0.1-5 parts of extrusion assistant, and the modifier of the mixed elements is a soluble substance containing one or a plurality of elements of B, P, La, Ca, Mg, Sr, Zn, Cu, Mn, Cd, Ga and In. The invention further provides a prepration method of the catalyst. The molecular sieve catalyst adopts the extrusion assistant and adds an appropriate amount of hole structure regulator, thereby improving product strength and hole structure, effectively improving diffusion performance of the catalyst and further improving selectivity of the low-carbon olefin. The catalyst has the advantages of appropriate strength, high hydrothermal stability, high activity and high selectivity of propylene.

The present invention relates to one kind of catalyst for liquid phase alkylation of ethylene to prepare ethylbenzene and aims at raising the stability and regeneration performance of catalyst. The present invention adops beta-zeolite molecular sieve with SiO2/Al2O3 molar ratio of 10-50 as catalyst, and the catalyst is processed first with high temperature steam and then with organic acid before use, and this raises the stability and regeneration performance of catalyst. The present invention may be used in the industrial production of liquid phase alkylation to prepare ethylbenzene.

The invention relates to a coal gasification catalyzer completely methanated by synthesis gas and a preparation and application thereof. The catalyzer contains an active component, a carrier and an accessory ingredient, wherein the active component is a transition metal oxide NiO, and the content of NiO is 10-75 percent of the total weight of the catalyzer; the carrier is a CeO2-based rare earth metal oxide, and the content of the rare earth metal oxide is 10-19 percent of the total weight of the catalyzer; and the accessory ingredient is La2O3, and the content of La2O3 is 0.1-15 percent of the total weight of the catalyzer; the preparation method adopts a simple homogeneous phase chemical precipitation process. The invention has the advantages of low cost on raw materials and simple preparation method, meets the current increasing needs of clean energies and meanwhile has the irreplaceable important role in the enhancement of international energy sources and resource security.

The invention discloses a method for preparing a Cu-SSZ-13 catalyst through an in-situ synthesis method. A Cu-SSZ-13 molecular sieve sample is prepared by taking acid as an exchange reagent and treating through an in-situ synthesis method. Compared with the currently used ammonium nitrate ion exchange method, the after treatment method for the Cu-SSZ-13 molecular sieve prepared through an in-situ synthesis method is more environment-friendly and effective; the activity of the prepared catalyst is higher; and the hydrothermal stability is better. According to the method, the silica-alumina ratio of the molecular sieve structure is increased while the catalyst having high catalytic activity is obtained; and the obtained Cu-SSZ-13 catalyst has excellent hydrothermal stability, wide temperature window and excellent N2 selectivity, and is very applicable to purification of tail gas from diesel cars.

The invention relates to a preparation method for converting methanol into propylene catalyst, which mainly solves the problems existing in the former art that the yield rate of the target product propylene is low, the P and E ratio (propylene / ethylene mass ratio) is low, and the hydrothermal stability is poor. The invention better solves the problems through adopting a technical proposal that ZSM-5 molecular sieve with the mol ratio SiO2Al2O3 from 20 to 1000 and adhesive are roasted after being mixed, and converted at the temperature of 20 to 100 DEG C and in 0.1 to 3 mol/L of ammonium acetate or 0.1 to 8.5 mol/L of acid solution, and steam treated for 1 to 15 hours after being roasted at the temperature of 400 to 700 DEG C and under the fluid water phase weight space velocity of 0.1 to10 hours <-1>, and then the precursor of the ZSM-5 molecular sieve is soaked with acid solution, and roasted to obtain the modified ZSM-5 molecular sieve catalyst. The invention can be used for the industrial production of converting methanol into propylene catalyst.

The present invention relates to a non-noble metal oxide combustion catalyst and a preparation method and use thereof, and belongs to the technical field of energy utilization and environment protection. The catalyst is iron oxide, cobaltosic oxide, nickel oxide, cupric oxide, vanadium oxide, chrome oxide, manganese dioxide or cerium dioxide prepared according to the following steps: (1) using hydrothermal chemical synthesis to form a precursor of a catalyst; and (b) washing, filtering, shaping, drying and calcinating the obtained precursor of the catalyst, and finally forming a combustion catalyst or coating the precursor of the catalyst on a carrier to form a combustion catalyst. The catalyst prepared by the method can be used in catalytic combustion of methane and other VOC gas, and has the advantages that the synthesis process is simple, the cost is low, the catalytic activity and hydrothermal stability is high, and the light-off temperature and complete combustion temperature of methane are low.

The invention discloses a catalyst for producing propylene by catalytic pyrolysis and a preparation method thereof. Calculated as the total weight of the catalyst, the catalyst comprises 20 to 40 weight percent of element-modified molecular sieve and 60 to 80 weight percent of heat-resistant inorganic oxide, wherein the content of a modified element is between 1 and 10 weight percent calculated as the total weight of the molecular sieve, the average grain diameter of crystal grains of the molecular sieve is between 10 and 100nm, and the modified element is one or a mixture of more of family IB metals and/or phosphorus. The catalyst is used for reactions that low carbon olefin, particularly the propylene is produced by C6-C12 olefins through catalytic pyrolysis, and has higher conversion rate of the C6-C12 olefins and yield of the propylene.

The invention discloses a preparation method of a metal modified Y type molecular sieve. The preparation method comprises the following steps: (1) treating the Y type molecular sieve with an acid solution; (2) dehydrating the treated Y type molecular sieve; (3) then dissolving a compound of modified metal elements in a buffer solution of ethyl alcohol-ammonium acetate-water so as to prepare impregnation liquid, mixing and impregnating the impregnation liquid and the molecular sieve obtained in the step (1), and calcining. Wherein modified metal is one or more of Fe, Cr, Ga, In, Tl, Sn and Co. The metal modified Y type molecular sieve obtained by the method is high in hydrothermal stability, and the productive rate for gasoline by cracking hydrocarbon oil is high.

This invention relates to methods for making a stabilized transition alumina of enhanced hydrothermal stability, which include the introduction of at least one structural stabilizer; a steaming step before or after the introduction step, wherein steaming is effective in transforming a transition alumina at least partially to boehmite and/or pseudoboehmite; and a calcining step to create a stabilized transition alumina. The combination of the structural stabilizer and the steaming step is believed to impart high hydrothermal stability to the alumina crystal lattice. Particularly preferred structural stabilizers include boron, cobalt, and zirconium. The stabilized transition alumina is useful as a catalyst support for high water partial pressure environments, and is particularly useful for making a catalyst having improved hydrothermal stability. The invention more specifically discloses Fischer-Tropsch catalysts and processes for the production of hydrocarbons from synthesis gas.

The invention provides a catalyst for selective catalytic reduction of nitrogen oxide, which comprises: a first composition selected from one or a combination of transition metal oxides excluding a second composition, and the second composition selected from one or a combination of cerium oxide, cerium-zirconium compound oxide and cerium-titanium compound oxide. The catalyst can be applied in the form of a granular catalyst, and can also be coated on multiporous integral ceramic to be applied in the form of a honeycomb catalyst. The invention also provides a manufacturing method for the catalyst, which comprises the following steps that: a precursor of the first composition is used to prepare the first composition; the second composition is prepared; and the first composition is loaded onto the second composition. Certain preferable embodiments for the catalyst can ensure that the health of human beings and animals can not be affected when the selective catalytic reduction of nitrogenoxide (NOx) emission is performed.

The invention relates to a preparation for multiporous material, especially a process for preparing organic and inorganic hetero-material with multiporous structure and application thereof. The hetero-material is a transition metal phosphonate with different organic phosphonic acid groups combined on the surface and skeleton of mesoporous and macroporous structure, wherein, the weight percent of the organic phosphonic acid P is 1% to 17%, and the transition metals can be selected from Ti salt, Al salt, Zr salt, etc. The hetero-material is directly synthesized by hydrothermal synthesis and can be used for heavy metal ion absorption with good absorption effect, the invention is provided with simple equipments and moderate synthesis conditions, and the raw materials is available, accordingly, the multiporous material preparing process is suitable for large-scale production.

The present invention relates to an epoxidation catalyst preparation method and a prepared epoxidation catalyst thereof, and applications of the epoxidation catalyst. According to the present invention, titanium is loaded onto a silica gel by using a chemical vapor deposition method, silanization treatment and hydrolysis are performed, and molybdenum is loaded onto the titanium surface by using a liquid phase ion exchange compounding method so as to achieve the directional loading of molybdenum; the epoxidation catalyst has excellent molybdenum stability; and with the application of the epoxidation catalyst in oxidation of olefins to produce the corresponding epoxy compound, the catalytic activity and the selectivity are high.

The invention provides a preparation method and application of a Cu-SSZ-13 catalyst. The preparation method comprises the following steps: 1) putting raw materials including a silicon source, an aluminum source, a template agent and seed crystals into a mortar, and grinding to form a uniform mixture; 2) feeding the mixture into a reaction kettle and crystallizing; after cooling, washing and drying, roasting to obtain an Na-SSZ-13 molecular sieve carrier; 3) preparing an ammonium nitrate solution, and adding into the Na-SSZ-13 molecular sieve carrier; after carrying out ion exchange, filtering, washing and drying to obtain an NH4-SSZ-13 molecular sieve; 4) preparing a copper nitrate solution and adding into the NH4-SSZ-13 molecular sieve; after carrying out ion exchange, filtering, drying and roasting to obtain the Cu-SSZ-13 catalyst. The Cu-SSZ-13 catalyst prepared by the preparation method has excellent NH3-SCR (Selective Catalytic Reduction) catalytic activity, N2 selectivity, hydrothermal stability, and H2O and SO2 positioning resisting properties, and is applicable to purification of tail gas of diesel vehicles.

This invention provides a method for preparing spherical Al2O3 with high hydrothermal stability. Based on the mechanisms of Al2O3 sintering and phase change, the method introduces phosphate ions, which can react with OH groups on the pore walls to reduce the quantity of OH groups and change the surface acidity of Al2O3. The method can prevent the sintering and phase change of Al2O3 pore channels, thus can improve the hydrothermal stability of spherical Al2O3 carrier. The hydrothermal stability of modified spherical Al2O3 is much higher than that of unmodified spherical Al2O3. The specific surface area of modified spherical Al2O3 is 190-200 m2/g, the pore volume is 0.85-1.25 mL/g, the particle diameters are 0.5-5 mm, the packing density is 0.3-0.55 g/cm3, and the weight content of P2O5 is 0.5-5%. The spherical Al2O3 can be used as catalyst or catalyst carrier for petrochemicals and fine chemicals.

The invention discloses a CsPW/Zr-MCM-41 catalyst prepared in a supercritical CO2 environment. The preparation method comprises the following steps: Zr-MCM-41 is taken as the carrier, and 10-60% of Cs modified salts is loaded by adopting the supercritical CO2 impregnation technology; with the utilization of the catalyst, the glycerin conversion rate reaches 65.2-100%, the acrolein selectivity reaches 56.8-85.4%; the invention further discloses application of the CsPW/Zr-MCM-41 catalyst to preparation of acrolein through glycerol selective dehydration. Compared with the prior art, the catalyst prepared by adopting the preparation method has the advantages that the dispersion degree of Cs modified salt on the carrier is high, the acting force between the Cs modified salt and the carrier is strong, the hydrothermal stability is high, the acidity loss possibility is low, and meanwhile, when compared with the conventional product, the obtained product is high in glycerin conversion rate and acrolein selectivity, and long in service life.

The invention relates to alumina coat slurry and a preparation method thereof, and mainly solves the problems of the prior art of poor stability of a prepared laminar composite carrier and short service life of a prepared thin-shelled noble metal catalyst. The alumina coat slurry comprises the following components: aluminum sol with an average granularity of less than 20 micrometres, active alumina, an organic adhesive, an inorganic adhesive, a surfactant, a pH modifying agent and the balance being water, wherein the average granularity of the slurry is less than 10 micrometres. The preparation method comprises the following steps: dissolving the aluminum sol, the organic adhesive, the surfactant and the pH modifying agent in water; mixing the mixture evenly with stirring at a high speed; then adding the inorganic adhesive and active alumina powder for high-speed dispersion; and regrinding the obtained alumina coat slurry to prepare the alumina coat slurry. Thus, the preparation method better solves the problems by adopting the technical proposal, and can be used in the industrial production of laminar composite carrier.

The invention relates to an improved MCM-41 mesoporous molecular sieve and a preparation method thereof, in particular relates to a dual-metal-atom improved MCM-41 mesoporous molecular sieve and the preparation method thereof. The molecular sieve consists of hexadecyl trimethyl ammonium bromide, ethyl orthosilicate, sodium hydroxide, Me metal salt (Co, Ni, Cr, Fe, Cu, V), lanthanum nitrate and water. The molecular sieve is prepared in the steps: at the room temperature, hexadecyl trimethyl ammonium bromide is mixed and dissolved with the sodium hydroxide, and is added with TEOS in dropping way, and simultaneously added with Me metal salt water solution and lanthanum nitrate solution in dropping way; the pH value of the mixed solution is adjusted by acetic acid to be 10 to 11, and is mixed for 1 to 2 hours after being stabilized; the sol is moved into a polyfluortetraethylene bottle to be heated and crystallized for 2 days in the oven at the temperature of 100 DEG C; after filtering, washing and drying for nights, and being calcined in a muffle at the temperature of 550 DEG C for 3 to 7 hours, the dual-metal-atom improved MCM-41 mesoporous molecular sieve is obtained. The product can simultaneously improve the acid performance and the water heating stability of the MCM-41 mesoporous molecular sieve, and can enlarge the actual application of the MCM-41 mesoporous molecular sieve in the catalyst filed.

A hydrocarbon catalytic cracking catalyst is characterized in that in terms of 100wt% of the catalyst, the catalyst comprises 30-80wt% of molecular sieve and 10-65wt% clay; the catalyst comprises 5.0-20.0wt% of P calculated in the form of P2O5, and 0-1.0wt% of La2O3; P in the catalyst is provided by aluminium phosphate sol; and the aluminium phosphate sol adopted by the catalyst comprises 2-10wt%of AI and 5-15wt% of P, wherein the pH of the aluminium phosphate sol is 1.0-2.5, and the aluminium phosphate sol comprises 2-20wt% of P calculated in the form of HNO3. The prepared hydrocarbon catalytic cracking catalyst has great strength and high activity, can be used as an auxiliary to be mixed with a main catalyst, hardly reduces the activity of the main catalyst, can improve product distribution, has excellent selectivity for dry gas and coke, and meanwhile can improve the yield of light oil.

A rare-earth contained super-stable Y zeolite is prepared from the super-stable Y zeolite containing sodium oxide (3-5 wt.%), rare-earth compound and water in wt ratio of 1:(0.001-0.5):(1-10) through preparing solution of rare-earth compound, mixing and the said Y zeolite, and grinding with shearing stress of at least 10 kg/cm2 for at least 1 min. Its advantages are higher hydrothermal stability, high stability of activity, and high resistance to sodium and heavy metal pollutions.