738results about How to "Good hydrothermal stability" patented technology

A meso-porous silicon aluminum material with thin diaspore-like phase structure is disclosed. The preparing process includes the following steps: aluminum materials and alkali solution are neutralized to glue, and then silicon materials are added, finally the product is given by aging, ion exchange, drying and baking. The meso-porous silicon aluminum materials possess good hydrothermal stability and can be used as catalyst carrier with strong macromolecule cracking capacity, higher raw oil conversion efficiency and lower heavy oil yield.

A molecular sieve containing composition, which can be applied in catalytic cracking reaction for producing more ethylene and propylene, and its preparation method. The composition contains a pentasil-type molecular sieve having a SiO2/Al2O3 molar ratio of 15-60, prepared by activation and modification with phosphorus, alkaline earth metal and transition metal. The composition essentially includes 85 DIFFERENCE 98% wt of pentasil-type molecular sieve, 1 DIFFERENCE 10% wt of P2O5, 0.3 DIFFERENCE 5% wt of alkaline earth oxide, and 0.3 DIFFERENCE 5% wt of transition metal oxide. The molecular sieve structure and active centers have high thermal and hydrothermal stability. The salient feature of this composition is that when applied as an active component of cracking catalyst for catalytic pyrolysis process, the yield of ethylene is above 18% and the total yield of ethylene and propylene is more than 40%.

Catalysts comprising metal-loaded non-zeolitic molecular sieves having the CHA crystal structure, including Cu-SAPO-34, methods for preparing such catalysts, and systems and methods for treating exhaust gas incorporating such catalysts are disclosed. The catalysts can be used to remove nitrogen oxides from a gaseous medium across a broad temperature range and exhibit hydrothermal stability at high reaction temperatures.

The present invention relates to process of catalytic hydration of ethylene epoxide to prepare glycol and aims at solving the problems of available corresponding process. The said process is especially suitable for low water ratio operation, and has the features of very low heat energy consumption and power consumption, high activity, selectivity and stability of catalyst, and low production cost. The said process may be used in industrial production of glycol.

The invention relates to a preparation method of a mesoporous-containing Y-shaped molecular sieve, and relates to a preparation method of a Y-shaped molecular sieve. The preparation method aims to solve the problems of small pore diameter and pore volume of the Y-shaped molecular sieve prepared through the traditional method. The preparation method comprises the following steps of: 1, preparing a sodium type Y-shaped molecular sieve; 2, preparing an ammonium type Y-shaped molecular sieve; 3, processing through an organic acid water solution; 4, processing through NaOH; and 5, processing through an ammonium nitrate water solution so as to obtain the mesoporous-containing Y-shaped molecular sieve. The mesoporous-containing Y-shaped molecular sieve is synthesized through a simple and effective method under a moderate condition, contains abundant mesoporous, is unchanged in microporosity, achieves the volume of the mesoporous at 0.5-1.5 mL/g, greatly promotes the macromolecule to approach a catalytic active center and is favorable for reaction mass transfer through more concentrated pore diameter distribution, has the advantages of adjustable ratio of silicon and aluminum contained in a framework and good hydrothermal stability and can be used as a catalyst carrier or directly used as a catalyst. The preparation method disclosed by the invention can be used for preparing the mesoporous-containing Y-shaped molecular sieve.

The invention relates to a method of molecular sieve catalyst synthesis using the kaolin for the synthesis of silicon aluminum phosphate molecular sieve, belonging to the technical field of the preparation of the catalyst materials. The invention is characterized in utilizing the low-cost kaolin as materials. Through (1) roasting the kaolin in the high temperature to gain the crystal aluminum sources and silicon sources; (2) mixing the kaolin with the phosphorus sources and the template agent with the deionized water, processing hydro-thermal crystallization, and roasting and activating the products after washing and drying, the catalyst of the silicon aluminum phosphate molecular sieve can be gained. The structure of the silicon aluminum phosphate molecular sieve is CHA or the intergrowth of CHA and AEI. The invention has the advantages of smaller or lamellar structure molecular sieve gains of the prepared catalyst, which can be used for the process of making olefin from the oxygenic compounds like the limited diffuse alcohol ether to gain the good activity of reaction and the product selectivity, and further the directly application of the catalyst carried by the kaolin micro sphere into fluidized bed reactor.

The catalytically cracking assistant capable of lowering the sulfur content in gasoline is composite oxide including aluminum zinc spinel, homogeneously distributed zinc oxide and at least one optional RE oxide. It is prepared through roasting the mixture of laminar aluminum zinc in hdrotalcite structure and optional RE oxide hydrate. The preparation process is simple, and the assistant has the features of high dispersion, high specific surface area, etc. The assistant after being formed is mixed with conventional FCC catalyst and/or active reinforcing assistant for application in catalytically cracking process, and has the function of lowering the sulfur content in gasoline and excellent hydrothermal stability.

The present invention provides a super-stable Y zeolite and the preparation method thereof. The ratio of silicate to aluminum in the super-stable Y zeolite is 6-11. The lattice constant of the zeolite is 2.446 to 2.458 nanometers. The percentage of non-skeleton aluminum in total aluminum in the zeolite is not higher than 30% by weight. The diameter of secondary pores with diameter of 2 to 100 nanometers in the zeolite shows a double probable distribution. The most probable diameter of the secondary pores with comparatively large diameter is 6-15 nanometers. The proportion of secondary pores with diameter between 8 to 100 nanometers in total secondary pores is 35% to 60%. The preparation method of the zeolite includes the step of making the super-stable Y zeolite come into contact with a solution containing organic acids and inorganic acids in the atmosphere of inert gases and/or nitrogen. The modified super-stable Y zeolite provided in the invention is applied to catalytic cracking; therefore the following effects can be realized: the cracking ability of heavy oil is strong, the selectivity of gasoline is high, and the selectivity of dry gas and carbon coke is good.

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 manufacture method of a molecular sieve honeycomb body for absorbing volatile organic compounds, which comprises the steps of: regulating 5-20 percent of ceramic fiber, 5-20 percent of adhesion agent, 5-15 percent of paper pulp and 60-80 percent of zeolite molecular sieve with water into a suspension with concentration of 2-10 percent; defibering and separating the suspension; then slowly stirring and adding poly dimethyl diallyl ammonium chloride, after flocculation occurs, adding anionic polyacrylamide and continuously stirring for 5-15 min and then making a paper plate; and making the made wet paper plate into a planar molecular sieve paper plate and a corrugated molecular sieve paper plate, and alternatively overlapping or coiling the planar molecular sieve paper plate and the corrugated molecular sieve paper plate into a honeycomb structure to obtain the molecular sieve honeycomb body. A zeolite molecular sieve provided by the invention is not easy to peel off, and is easy to process into various shapes; and the molecular sieve honeycomb body can absorb organic matters under different temperatures and humidities.

Provided is a catalyst composition for treating exhaust gas comprising a blend of a first component and second component, wherein the first component is an aluminosilicate or ferrosilicate molecular sieve component wherein the molecular sieve is either in H+ form or is ion exchanged with one or more transition metals, and the second component is a vanadium oxide supported on a metal oxide support selected from alumina, titania, zirconia, cella, silica, and combinations thereof. Also provided are methods, systems, and catalytic articles incorporating or utilizing such catalyst blends.

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 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 provides a preparation method of a Cu-SSZ-13 molecular sieve based catalyst. The preparation method comprises the following steps of adding sodium aluminate, sodium hydroxide, a silica solution, copper sulfate, tetraethylenepentamine and an organic template agent to deionized water, and performing stirring so as to obtain gel; and performing a reaction in a reaction kettle, then performing cooling, performing centrifugal filtration, performing washing, performing drying, and performing calcining so as to obtain the Cu-SSZ-13 molecular sieve based catalyst. The method disclosed by the invention is simple in technology, low in cost, energy-saving, and environmentally-friendly. Use of a copper salt solution ion exchange and calcining technology many times is avoided, and the defect that a conventional technology needs performing later-period ion exchange so as to reduce content of active components is overcome. The silica alumina ratio of the Cu-SSZ-13 molecular sieve based catalyst prepared by the method disclosed by the invention is adjustable within the range of 7.9- 26.7, and the percentage by mass of copper is in the range of 0.47 -8.6wt%, excellent NH3-SCR catalytic activity, water thermal stability, alkali metal poisoning resistance and noble metal poisoning resistance can be kept in a wide-temperature window.

The invention relates to a synthetic method of a mesoporous-microporous molecular sieve, which is characterized in that a microporous molecular sieve precursor solution is synthesized, the precursor is composed of (1-500)Na2O: Al2O3: (1-850)SiO2: (10:800)H2O; a segmented copolymer is used as a main template, a modifier containing trimethoxy silane is used for modifying a polymer, the modified polymer is taken as an assisted template, an dual template is used for assembling the precursor solution of the microporous molecular sieve. According to the invention, the mesoporous-microporous molecular sieve presents great hydro-thermal stability and an adjustable tunnel structure, the specific surface area is between 800-1000m<2>/g, the hydrothermal treatment is carried out by 100% of water vapor with the temperature of 800 DEG C for 8 hours, the retention rate of the specific surface area can reach more than 39%, the hexagonal structure is still obvious, the long-distance ordered nature of the tunnel enables good preservation. The prepared catalyst presents good catalysis performance on the catalytic cracking of the heavy oil.