130 results about "SSZ-13" patented technology

The present invention relates to a process for reducing cold start emissions in an exhaust gas stream (such as from an internal combustion engine) by contacting the exhaust stream with a combination of molecular sieves comprising (1) a small pore crystalline molecular sieve or mixture of molecular sieves having pores no larger than 8 membered rings selected from the group consisting of SSZ-13, SSZ-16, SSZ-36, SSZ-39, SSZ-50, SSZ-52 and SSZ-73 molecular sieve and having a mole ratio at least 10 of (a) an oxide of a first tetravalent element to (b) an oxide of a trivalent element, pentavalent element, second tetravalent element which is different from said first tetravalent element or mixture thereof and (2) a medium-large pore crystalline molecular sieve having pores at least as large as 10 membered rings selected from the group consisting of SSZ-26, SSZ-33, SSZ-64, zeolite Beta, CIT-1, CIT-6 and ITQ-4 and having a mole ratio of at least 10 of (a) an oxide of a first tetravalent element to (b) an oxide of a trivalent element, pentavalent element, second tetravalent element which is different from said first tetravalent element or mixture thereof.

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 high silicon CHA type SSZ-13 zeolite membrane preparation method, which is characterized that a SSZ-13 zeolite membrane with high performance is prepared on a porous ceramics support body by employing multiple templates combination, and a dual-template is employed for inducing the compact zeolite membrane on the surface of the porous support body. The membrane has the characteristics of high chemical stability and water vapour resistance, and is suitable for separating inorganic gas such as hydrogen or carbon dioxide or nitrogen from low carbon hydrocarbon, and is also suitable for separating C1-C3 low carbon hydrocarbon such as ethane/ethane.

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.

The invention relates to a method for preparing an H-SSZ-13 molecular sieve and belongs to the field of hydrogen molecular sieve catalyzed synthesis. The method comprises the following steps: a) uniformly stirring and mixing a silicon source, an aluminum source, a template agent and water; b) uniformly mixing the silicon source, the aluminum source, the template agent, a cosolvent and water to form initial gel, adding a guiding agent solution, and crystallizing after being uniformly stirred; and c) separating, washing, drying and calcining the product after crystallization completion, therebyobtaining the H-SSZ-13 molecular sieve. According to the method disclosed by the invention, due to use of the guiding agent solution and the aided template agent, the effects of reducing usage of an expensive template agent and shortening the crystallization time are achieved, so that the production cost is greatly reduced.

The invention provides a synthesis method of an SSZ-13 molecular sieve. A USY molecular sieve or Beta molecular sieve with adsorbed N,N,N-trimethyl-1-adamantanamine cations is used as a structure guide agent to synthesize the SSZ-13 molecular sieve together with an aluminum source, a silicon source, an alkali source, water and mixed seeds, thereby greatly reducing the consumption of the expensive template N,N,N-trimethyl-1-adamantanamine cations in the traditional method, and obviously lowering the cost for synthesizing the SSZ-13 molecular sieve. The method can enhance the crystallization rate of the SSZ-13 molecular sieve and shorten the required crystallization time, and thus, is more beneficial to industrial production. The SSZ-13 molecular sieve synthesized by the method has high crystallinity and favorable hydrothermal stability; and the synthesized SSZ-13 molecular sieve can be used as an MTO (Methanol To Olefins) catalyst and can also be used as an automobile tail gas treatment catalyst support.

The present invention discloses a method for synthesizing a CHA molecular sieve by using tetraethyl ammonium hydroxide as a templating agent. The method comprises: mixing a templating agent tetraethyl ammonium hydroxide (TEA) and NaOH, melting into an appropriate amount of water to obtain a mixed solution, adding a USY molecular sieve as a silicon source and an aluminum source to the mixed solution, continuously stirring until obtaining a homogeneous gel, transferring the gel to an autoclave, crystallizing for a certain time at a certain temperature, cooling at a room temperature after completing the crystallizing, recovering the solid phase product through filtration, washing with deionized water, drying, and calcining at a temperature of 580 DEG C in air so as to obtain the SSZ-13 molecular sieve. According to the present invention, the used templating agent has advantages of low price and environment pollution reducing; and the Cu-based small pore molecular sieve catalyst having the CHA structure obtained through the further preparation has characteristics of excellent NH3-SCR activity, extremely high solid phase yield and substantially-reduced production cost, and is suitable for the large-scale promotion application of Cu-SSZ-13.

The invention relates to a Cu-SSZ-13 molecular sieve based catalyst adopting a core-shell structure as well as preparation and an application of the catalyst and belongs to the technical field of purification treatment of nitric oxide in the technical field of environmental protection. An SSZ-13 molecular sieve is taken as a carrier and subjected to desilicication treatment with NaOH solutions with different concentrations, and a mesoporous structure is introduced to the molecular sieve; then, a mesoporous template agent is added to a turbid liquid containing the mesoporous molecular sieve, and an aluminosilicate shell adopting a mesoporous structure is self-assembled on the surface of the molecular sieve; finally, the corresponding catalyst is prepared with an ion exchange method. The working temperature window of the catalyst is widened, the hydrothermal stability and the hydrocarbon toxicosis resisting capability of the catalyst are improved, and the catalyst has good actual application prospect; in a motor vehicle exhaust component simulation experiment, the removal efficiency of NOx is 90% or higher; the removal efficiency of NOx is 80% or higher after the catalyst is subjected to hydrothermal ageing for 24 h at the temperature of 750 DEG C; ; the removal efficiency of NOx is 80% or higher in the presence of propylene.

The invention provides a method for synthesizing an SSZ-13 molecular sieve by a double-template agent in one step. The method takes N,N,N-trimethyl adamantanamine (TMADa<+>) and choline chloride as the double-template agent and the SSZ-13 molecular sieve with a high crystallization degree and a pure phase is obtained; after Cu<2+> is loaded, the SSZ-13 molecular sieve has excellent NO selective reduction capability and high hydrothermal stability. According to the method provided by the invention, the utilization of an expensive template agent, namely the N,N,N-trimethyl adamantanamine, can be greatly reduced, so that the production cost of the SSZ-13 molecular sieve is reduced; the method utilizes a cheap template agent to replace one part of the expensive template agent and a product can be applied to an NOx elimination process of a catalyzing device of a diesel vehicle post-treatment (NH3-SCR (Selective Catalytic Reduction)) system.

The present invention provides a method for synthesizing CHA by using tetraethyl ammonium hydroxide and N,N,N-trimethyl adamantane ammonium hydroxide mixture as templating agent. The method comprises: mixing TEA and TMAdA as a mixed templating agent, mixing the templating agent and NaOH, melting into an appropriate amount of water to obtain a mixed solution, adding a USY molecular sieve as a silicon source and an aluminum source, continuously stirring until obtaining a homogeneous gel, transferring the gel to an autoclave, crystallizing for a certain time at a certain temperature, cooling at a room temperature, recovering the solid phase product through filtration, washing with deionized water, drying, and calcining at a temperature of 580 DEG C in air so as to obtain the SSZ-13 molecular sieve. According to the present invention, the synthesized CHA molecular sieve has high crystallinity and high solid phase yield, and the TEA and the TMAdA are adopted as the mixed templating agent to replace the expensive TMAdA single templating agent, such that the production cost is substantially reduced, and the large-scale promotion application of SSZ-13 is easily achieved.

The invention discloses a copper-based supported ammoxidation catalyst and a preparation method thereof. The catalyst takes CuO as an active component and is expressed as CuO/M (M represents a supporter), wherein the supporting ratio is m(CuO)/m(M)=0.1. The invention also provides the preparation method of the copper-based supported ammoxidation catalyst. The prepared copper-based supported ammoxidation catalyst is applicable to ammonia gas purification for fixed sources and movable sources and can be applied in the downstream position of an SCR system to eliminate ammonia escape. Meanwhile, the catalyst is also applicable to treatment of ammonia gas produced and exhausted in breeding industry plants and agricultural sources. Compared with other ammoxidation catalysts, the catalyst copper-based supported ammoxidation catalyst taking SSZ-13 as a supporter has the characteristics of no toxicity, high activity, high selectivity and the like, good NH3 conversion rate is realized by the aidof the active component CuO, high Na selectivity is guaranteed by the aid of the supporter SSZ-13, and 90% or above of N2 selectivity can be kept in the whole temperature window. The copper-based supported ammoxidation catalyst has good catalytic activity and N2 selectivity in a wide temperature test interval at 200-400 DEG C.

The invention relates to the field of molecular sieve preparation, and aims to provide a method for synthesizing an SSZ-13 molecular sieve through solid-phase grinding. The method for synthesizing the SSZ-13 molecular sieve through solid-phase grinding comprises the following steps: weighing a silicon source, an aluminum source, an alkali source and a template agent for crystallization reaction so as to obtain a crystallization reaction product after the reaction is completed, cooling and washing till being neutral, drying to obtain crude molecular sieve powder, and roasting the crude molecular sieve powder for 5 hours in air of 550 DEG C, thereby obtaining a final product SSZ-13 molecular sieve. The SSZ-13 molecular sieve with relatively good crystallinity degree is synthesized through solid-phase raw material grinding under a solvent-free condition, so that the use of solvent water is reduced to the maximum extent, the synthesis route only involves mixing synthesis steps of primary raw materials, the method is greatly simplified when being compared with a conventional method, the yield and the utilization rate of a single kettle are both relatively increased, the production cost is greatly lowered, the pollution to the environment is greatly reduced, and great industrial application prospect can be achieved.

A synthetic method of an SSZ-13 zeolite molecular sieve is disclosed. The method includes preparing SSZ-13 crystals under crystallization conditions from raw materials comprising an oxide of at least one quadrivalent element or a quadrivalent element mixture, an oxide of at least one trivalent element and a trivalent element mixture, at least one alkali metal compound, N,N,N-trimethyl-1,3,5,7-tetraazatricyclo[3.3.1.1]decane-2-ammonium hydroxide or a mixture of the N,N,N-trimethyl-1,3,5,7-tetraazatricyclo[3.3.1.1]decane-2-ammonium hydroxide and the SSZ-13 molecular sieve crystal seeds, hydroxyl ions and water. The method is a method of synthesizing the SSZ-13 molecular sieve by adopting a novel and cheap template. The method avoids adoption of traditional expensive N,N,N-trimethyladamantan-1-ammonium cations or benzyl trimethyl quaternary ammonium cations as templates to synthesize the SSZ-13 molecular sieve, thus significantly reducing the cost of synthesizing the SSZ-13 zeolite molecular sieve.

The invention discloses a method for synthesizing a high-silicon CHA type SSZ-13 molecular sieve by utilizing topologic reconstruction of a seed crystal and LTL type L zeolite. The method comprises the following steps: weighing water, an alkali source, a template agent, an additional solid silicon source, L zeolite and a seed crystal to carry out a crystallization reaction, completely reacting toobtain a crystallization reaction product, cooling and washing to be neutral, and drying to obtain crude molecular sieve powder; and calcining the crude molecular sieve powder in air at the temperature of 550 DEG C for a certain time, thereby obtaining the final product SSZ-13 molecular sieve. According to the method disclosed by the invention, the high-silicon CHA type SSZ-13 molecular sieve is synthesized by adopting direct topologic reconstruction of the LTL type L zeolite at a low silica-alumina ratio, and the initial L zeolite does not need to be subjected to dealuminzation pretreatment.By regulating the addition amount of the L zeolite, the silica-alumina ratio of the product SSZ-13 molecular sieve can be regulated in a wide range, the solid phase yield is increased, the productioncost can be reduced, and industrialized production is facilitated.

The invention relates to an oxide and molecular sieve compound catalyst and preparation and application thereof, and belongs to the technical fields of environmental material, environmental catalysis and environmental protection. The catalyst is prepared by taking Cu-SSZ-13 as a primary active component and manganese oxide and cerium oxide as secondary active components exerting synergistic effect, and an impregnation method is adopted. The catalyst is characterized in that low-temperature activity is greatly improved while good medium-high temperature activity of the Cu-SSZ-13 and N2 selectivity are sustained, light-off temperature is reduced to 80DEG C, and NOx conversion rate higher than 90% is achieved within the temperature range of 100-200DEG C; NH3 is taken as a reducing agent, total gas flow rate is 300ml/min, and airspeed is respectively controlled to be 15000, 50000 and 100000h<1>. The catalyst is suitable for both low-temperature NOx treatment after dust separation and desulfation in stationary-source flue gas treatment and low-temperature NOx treatment of cold-start stage in diesel exhaust treatment.

The invention provides a preparation method of a Cu-SSZ-13 molecular sieve. The method comprises the following steps: (1) mixing an aluminum source, sodium hydroxide, a Cu-TEPA complex and a templateagent with deionized water, uniformly stirring, then adding a silicon source, continuously stirring till the materials are uniformly mixed to obtain a mixture; (2) crystallizing the mixture for 48-96hours at 120-170 DEG C to obtain a crystallized product; (3) drying the crystallized product for 8-12 hours at 80-120 DEG C to obtain a dried product; and (4) roasting the dried product for 6-10 hoursat 500-600 DEG C to obtain the Cu-SSZ-13 molecular sieve. The molecular sieve has broad application prospects in the fields of the petrochemical industry, MTO reaction, exhaust purification and the industry of fine chemicals, and can be used as a catalyst for removing NOx in the automobile exhaust.

A metal manganese modified silicon-aluminum molecular sieve material Mn-SSZ-13 is provided. The material comprises 0.1-10% of manganese, 0-15% of aluminum, 75-100% of silicon and 0-25% of copper. Two materials have CHA type topological structures, and the specific surface area measured by a BET process after calcination at 600 DEG C for 4 h is not less than 500 m<2>/g. A preparing process includes fully mixing a copper source (may be none), a template, an aluminum source, sodium hydroxide, a silicon source and water according to a certain sequence to obtain an initial gel solution, crystallizing, performing ammonium chloride ion exchange, calcinating and performing manganese ion exchange to obtain a product. The prepared molecular sieve material has advantages of high MTO diolefin selectivity and long catalytic service lifetime, and can be used for nitrogen oxide selective reduction (SCR catalysts).

The invention belongs to the field of preparation of molecular sieves and particularly relates to a rapid synthesis method for small-crystal-grain molecular sieves and an application of the small-crystal-grain molecular sieves. The rapid synthesis of the small-crystal-grain molecular sieves is achieved through the procedures of firstly, preparing a precursor mixture, then, preparing gel and finally carrying out direct crystallization. The method is applied to the synthesis of the following molecular sieves, but not limited to: ZSM-5, ZSM-11, ZSM-22, ZSM-23, ZSM-35, SAPO-34, SAPO-11, SAPO-18, SSZ-13 and EU-1. Molecular sieve products synthesized by the method have the characteristics of small crystal grain, large specific surface area, high crystallinity and high yield. According to the method, the crystallization time can be shortened greatly, the production efficiency is increased, and the manufacturing cost of the molecular sieves is reduced.

The present invention belongs to the technical field of zeolite molecular sieves, and in particular relates to a synthesis method of SSZ-13 zeolite. The method comprises the steps: performing hydrothermal reaction on a mixture of alkali metal or an alkaline earth metal source, an oxide source of a trivalent element, an oxide source of a tetravalent element, water and a structural guiding agent, to obtain an SSZ-13 zeolite crystal, cooling, filtering, and washing with water to obtain SSZ-13 zeolite. The structural guiding agent used in the invention has the advantages of low toxicity, low cost, wide range of Si/Al ratio of a synthetic product, low activation temperature, and easiness in industrialization compared with other known structural guiding agents. The SSZ-13 zeolite prepared in the invention shows a high catalytic conversion rate in catalytic removal reaction of nitrogen oxides when being used as a catalyst.

The invention relates to an SSZ-13/SSZ-39 composite structure molecular sieve as well as a synthesis method thereof, and mainly solves the problems of single structures, less strong and weak acid centers and low catalytic activity of molecular sieve porous materials in the prior art. The SSZ-13/SSZ-39 composite structure molecular sieve is characterized by comprising the SSZ-13 and SSZ-39 two phases, the problems are well solved, and the SSZ-13/SSZ-39 composite structure molecular sieve can be applied to industrial production of hydrocarbon downstream products from a synthesis gas.

The invention discloses a preparation method for an SCR catalyst for purifying oxynitride in motor vehicle exhaust .The preparation method includes the steps of preparation of an SSZ-13 molecular sieve, preparation of a Cu-SSZ-13 catalyst and preparation of an integrated SCR catalyst .The preparation method is simple, production cost is lowered, SSZ-13 crystallization time is short, crystallization is relatively pure, HN3-SCR catalytic activity is high, and the purification rate of oxynitride in motor vehicle exhaust is high.

The invention provides an SSZ-13 molecular sieve catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: adding a sodium source, a silicon source, an aluminum source, a boron source, a template agent and deionized water into a synthesis kettle according to a ratio, then dynamically or statically crystallizing in temperature stages, filtering, washing and drying the product to obtain molecular sieve raw powder; roasting the molecular sieve raw powder at high temperature in the air atmosphere for removing the template agent, exchanging the molecular sieve raw powder with ammonium ions, then roasting the molecular sieve raw powder at the high temperature to obtain a hydrogen type SSZ-13 molecular sieve with a high silicon-aluminum ratio (the ratio of nSiO2 to nAl2O3 is greater than 80), wherein the hydrogen type SSZ-13 molecular sieve has appropriate acidic sites, thermal stability and aperture size. According to the SSZ-13 molecular sieve with controllable and high silicon-aluminum ratio, high crystallinity, small crystal grains, the range of the silicon-aluminum ratio of SSZ-13 prepared by the conventional method is broken through; the problem that the crystallinity of the molecular sieve catalyst during regeneration is reduced can be solved; when the SSZ-13 molecular sieve is used as a catalyst and is applied to MTO reaction, the SSZ-13 molecular sieve has extremely high reaction activity and selectivity.