28results about How to "Good hydrothermal stability" patented technology

The present invention relates to the technical field of nitrogen oxide gas purification, and in particular to a palladium-containing RHO zeolite nitrogen oxide adsorbent and a preparation method thereof. When the adsorbent is subjected to in-situ adsorption infrared analysis, the adsorbent has a peak value of 1840-1900cm ‑1 The infrared absorption peak intensity at 1780~1840cm ‑1 The ratio of the infrared absorption peak intensity at the position is greater than 0.9. The adsorbent contains at least silicon, aluminum and oxygen as skeleton atoms, wherein the molar ratio of silicon atoms to aluminum atoms is (2-50):1. The palladium in the adsorbent accounts for 0.1-5.0% of the mass of the RHO zeolite. The adsorbent not only has a high NO x It has high storage capacity and higher hydrothermal stability, and can be used as a PNA material to meet the actual needs of motor vehicle exhaust purification.

The invention discloses a carbon-coated copper catalyst as well as a preparation method and application thereof, and relates to the technical field of catalysts. According to the technical scheme, beta cyclodextrin is used as a carbon source, so that active component copper-containing particles are uniformly distributed on a carbon coating layer; wherein a carbon coating layer derived after cyclodextrin pyrolysis can effectively inhibit migration and agglomeration of copper active sites, so that the catalyst has relatively high selectivity and relatively good reaction activity, and the catalytic performance of the catalyst is promoted to be improved; the carbon-coated copper catalyst is suitable for catalyzing an ethanol water phase reforming hydrogen production reaction, the hydrogen production rate reaches 35.6 [mu] mol H2 / gcat / s, the hydrogen selectivity is higher than 99.9%, and long-time continuous and stable operation of ethanol water phase reforming hydrogen production can be ensured.

The invention discloses a methane reforming catalyst capable of improving hydrothermal resistance as well as a preparation method and application of the methane reforming catalyst, and belongs to the technical field of catalyst preparation. According to the catalyst, a modified HAP-Ce composite carrier is prepared through coprecipitation, hydrothermal treatment and calcination, metal precursor salt serves as a modification component, Ni is impregnated and loaded, calcination is conducted, and then water vapor / nitrogen high-temperature hydrothermal treatment and hydrogen reduction are conducted to obtain the target catalyst. According to the catalyst, a heterogeneous metal oxide composite interface is constructed in situ, stable pinning of Ce species is achieved, and the Ni anchoring effect is enhanced, so that Ce migration and Ni sintering under the hydrothermal condition are inhibited, and high reaction activity, excellent carbon deposition resistance and good hydrothermal stability are shown; the preparation method has the advantages of controllable conditions and simple steps, and is easy for large-scale production and application.

The invention provides a grease hydrodeoxygenation catalyst and a preparation method and application thereof, the preparation method comprises the following steps: mixing an aluminum-containing inorganic porous material, an acidic solution, an extrusion aid, a magnesium salt and a nickel salt, then carrying out extrusion molding to obtain a carrier precursor, and drying and roasting the carrier precursor to obtain a hydrodeoxygenation composite carrier; by taking the total weight of the carrier as 100%, the content of the magnesium element is 0.5-10%, and the content of the nickel element is 0.3-2%; dipping the hydrodeoxygenation composite carrier with a dipping solution containing active metal, and then drying and roasting to obtain the grease hydrodeoxygenation catalyst. When the hydrodeoxygenation composite carrier is prepared, magnesium salt and nickel salt are combined, and the hydrodeoxygenation composite carrier with a nickel-doped magnesium aluminate spinel structure can be obtained. The hydrodeoxygenation composite carrier has good hydrothermal stability and mechanical strength. The grease hydrodeoxygenation catalyst prepared by loading an active metal component on the hydrodeoxygenation composite carrier is stable in deoxygenation activity and excellent in deoxygenation effect.

This invention discloses a coal tar hydrogenation catalyst, its preparation method, and a coal tar hydrogenation process. The preparation method comprises: (1) treating an organic polymer to obtain material A; (2) mixing material A, boehmite powder, and an aqueous solution of the polymer and molding it to obtain a carrier precursor; (3) heat-treating the carrier precursor, then mixing it with a soluble nickel salt solution and drying and calcining it to obtain a modified carrier; and (4) introducing an active metal component onto the modified carrier and drying and calcining it to obtain the coal tar hydrogenation catalyst. This invention also provides a coal tar hydrogenation catalyst prepared by the above method, and a coal tar hydrogenation process. The catalyst has high tolerance to metal impurities, high water resistance, hydrogenation demetallization activity, and stability, and can meet the requirements for catalyst indicators during long-term stable operation of the hydrogenation unit.

The invention provides a hydrodeoxygenation composite carrier and a preparation method and application thereof.The preparation method comprises the steps that an aluminum-containing inorganic porous material, an acid solution, an extrusion aid, magnesium salt and nickel salt are mixed and then subjected to extrusion molding to obtain a carrier precursor, and the carrier precursor is dried and roasted to obtain the hydrodeoxygenation composite carrier; the total weight of the hydrodeoxygenation composite carrier is 100%, and the content of the magnesium element is 0.3-8%, and the content of the nickel element is 0.3-1%. The hydrodeoxygenation composite carrier provided by the invention has hydrothermal resistance and higher mechanical strength, and can improve the hydrothermal stability of a grease hydrodeoxygenation catalyst taking the hydrodeoxygenation composite carrier as a carrier in the hydrodeoxygenation process, thereby improving the deoxygenation effect of the grease hydrodeoxygenation catalyst.

This invention discloses a catalyst for the production of ethylene and propylene, its preparation method, and its applications. The catalyst comprises the following components: I) 1%–10% of chemical formula A x B y D z A compound of O4; in the chemical formula, the oxidation states of elements A, B, and D are m, n, and p, respectively, satisfying x·m + y·n + z·p = 8, where m, n, and p are integers not greater than 3; the A x B y D z O4 has a spinel structure; II) 0.5%–10% is selected from at least one oxide of rare earth elements, P, Mo, and W; III) 20.0%–55.0% is selected from at least one zeolite of ZSM-5 and ZSM-11; IV) 10%–30% is a binder; V) 25.0%–60.0% is clay. This catalyst is used in the catalytic cracking of petroleum hydrocarbons to produce ethylene and propylene, and features good catalyst stability, low methane yield, and high ethylene and propylene yields.

This invention discloses a composite Li-Ca-Ce-LSX hydrophobic molecular sieve, its preparation method, and its applications. The method further modifies Li-LSX molecular sieves with Ca and Ce, synthesizing the composite Li-Ca-Ce-LSX hydrophobic molecular sieve via an aqueous solution exchange method. The preparation method of this invention is simple, and the obtained composite Li-Ca-Ce-LSX hydrophobic molecular sieve has a particle size of 0.2~0.4 mm, exhibits good crystallinity and adsorption performance, high polarizability, high adsorption capacity for nitrogen and nitrogen-oxygen separation coefficient, and a certain degree of hydrophobicity. This significantly improves the molecular sieve's environmental sensitivity and extends its service life. It can be used as a high-efficiency catalyst, heavy metal ion adsorbent, and concrete additive, with a wide range of applications.

The application discloses a method for quickly regulating layer spacing of a layered molecular sieve and application thereof. The method is characterized by using tetraethyl silicate condensate, tetrabutyl titanate silane and ferrocene silane as intercalation reagents, making a carrier gas carry vaporized intercalation reagents to flow through a reactor loaded with the layered molecular sieve, making the carrier gas carry vaporized deionized water to flow through the reactor loaded with the layered molecular sieve, and then performing calcination on the layered molecular sieve to obtain a pillared post-molecular sieve with good thermal stability. The application adopts gas phase pillaring, and has the advantages of simple preparation method, mild conditions, small amount of raw materials, simple steps, high yield, easy scale production, and the like. The intercalation reagent improves the high-temperature tolerance of the original layered molecular sieve, and at the same time, a plurality of active sites and places for adsorption of reactants are introduced at one time. The pillared post-molecular sieve is used in a reaction of preparing epoxycyclooctane by oxidizing cyclooctene with hydrogen peroxide, and the reaction has a cyclooctene conversion rate of 43% or more and an epoxycyclooctane selectivity of 65% or more.

The invention relates to a precious metal three-way catalyst as well as a preparation method and application thereof. The precious metal three-way catalyst comprises an alumina carrier, a cerium-zirconium solid solution and an active component M1, metal M2 is also loaded on the alumina carrier; the cerium-zirconium solid solution covers the surface of the alumina carrier, and the active component M1 is dispersed on the surface of the cerium-zirconium solid solution; the active component M1 comprises any one or a combination of at least two of Rh, Ir or Ru; the metal M2 comprises a combination of at least two of Pd, Pt, Rh or Au; the active component M1 and the metal M2 comprise at least three different elements. The noble metal three-way catalyst provided by the invention is used for degrading CO, NOx and CH3OH in an equivalent combustion mode, and is good in low-temperature activity, good in hydrothermal stability, relatively small in performance difference after hydrothermal aging, and wide in application prospect.

A phosphorus-modified MFI-structured molecular sieve, which is characterized in that the molecular sieve has a K value, satisfying: 70% ≤ K ≤ 90%; for example, 75% ≤ K ≤ 90%; further for example, 78% ≤ K ≤ 85%; wherein, the K value is as defined in the specification; the present invention also relates to a cracking auxiliary or cracking catalyst comprising the phosphorus-modified MFI molecular sieve, and a process of preparing the same and use thereof.

The invention discloses a granular tail gas combustion catalyst, a preparation method thereof and a tail gas purification method. The granular catalyst comprises the following components: active components comprise Pt, Bi, La and Hf, a carrier comprises powdery Al2O3 and granular Al2O3, and the powdery Al2O3 is obtained by mixing and roasting alpha '-AlOOH and rho-Al2O3. The preparation method comprises the following steps: impregnating and loading the active component on powdery Al2O3, preparing the impregnating liquid into slurry, and coating granular Al2O3 with the slurry to obtain the catalyst. The addition of Bi, La and Hf inhibits the agglomeration of noble metal particles, the powdery Al2O3 has high hydrothermal stability, and the catalyst has excellent stability and long service life when being used in the fixed bed tail gas catalytic combustion reaction.

The invention relates to the technical field of automobile exhaust purification and discloses a catalytic oxidation catalyst as well as a preparation method and application thereof. The invention relates to a catalytic oxidation catalyst, which comprises a carrier, a first coating and a second coating, the carrier is a regular structure carrier; the first coating comprises first cerium-zirconium composite oxide and / or first modified aluminum oxide and first precious metal, and the first precious metal is Pd and / or Pt; the second coating comprises at least one of a transition metal oxide, a second cerium-zirconium composite oxide and a second modified alumina, and a second noble metal, the second noble metal is Pd or Pt, the total amount of the first noble metal and the second noble metal is not higher than 20g / cft by element on the basis of the total amount of the catalyst, and the catalyst does not contain a molecular sieve. According to the catalyst, coating distribution is optimized based on reaction chemical characteristics in the tail gas treatment process, the effect of reducing the total content of precious metal is achieved, and wide application prospects are achieved.

The invention provides a layered silicate material, a silicate molecular sieve and a preparation method and application thereof, and belongs to the technical field of molecular sieves. According to the layered silicate material provided by the invention, the ratio of Si to heteroatoms is highly adjustable, the layered silicate material has good thermal stability and hydrothermal stability, a 12-membered ring opening is formed in a silicate layer, and the layered silicate material can be used as a precursor for preparing a molecular sieve to generate a three-dimensional silicate molecular sieve through topological condensation; the monolayer silicate nanosheet can also be obtained through layer stripping treatment and is used for preparing an oriented film, an adsorbent, a catalyst, an ion exchanger, a nanofiltration material or a seawater desalination film and the like. The framework of the silicate molecular sieve provided by the invention has eight topology independent atoms, the crystal structure of the silicate molecular sieve has a 12 * 12 * 12-membered ring three-dimensional cross duct system, and the silicate molecular sieve can be used as a catalyst, an ion exchanger or an adsorbent.

The invention discloses a composite modified ZSM-5 molecular sieve and a preparation method thereof. The composite modified ZSM-5 molecular sieve comprises a phosphorus oxide, manganese oxide and a B-Al-ZSM-5 molecular sieve, and the absolute value of the difference between the crystal bulk phase silica-alumina ratio measured by XRF and the crystal surface silica-alumina ratio measured by EDS of the composite modified ZSM-5 molecular sieve is less than or equal to 1. The preparation method of the composite modified ZSM-5 molecular sieve comprises the following steps: impregnating a B-Al-ZSM-5 molecular sieve with a phosphorus-containing compound, and impregnating with a manganese-containing compound to obtain the composite modified ZSM-5 molecular sieve. The B, P and Mn three-element composite modified molecular sieve is prepared in the absence of a template agent and an organic additive, can be used in catalytic cracking, catalytic cracking and other reactions, and has the characteristics of high conversion rate, good low-carbon olefin selectivity and the like.

The invention belongs to the technical field of antibacterial composite coatings and discloses a method for preparing an antibacterial composite coating by filling micro-arc oxidation titanium alloy plate micropores with a nano Ag / ZSM-5 molecular sieve and the antibacterial composite coating. The method comprises the following steps: pretreating the surface of a titanium alloy plate by adopting a micro-arc oxidation technology; nano ZSM-5 molecular sieve crystal grains are prepared through in-situ hydrothermal synthesis, Ag is loaded on a nano ZSM-5 molecular sieve through an ion exchange method to obtain a nano Ag / ZSM-5 molecular sieve, the nano Ag / ZSM-5 molecular sieve is filled in holes of a titanium alloy plate subjected to micro-arc oxidation, the filled titanium alloy plate is subjected to secondary hydrothermal hole sealing, and the antibacterial composite coating is obtained. The micro-arc oxidation titanium alloy and the nano Ag / ZSM-5 molecular sieve are combined to form the antibacterial composite coating, the titanium alloy plate is functionalized, the wear resistance and corrosion resistance are improved, the performance of the titanium alloy plate is further improved, the problem of holes or microscopic cracks of a micro-arc oxidation film layer is solved, and the service life of the titanium alloy plate is prolonged. The device serves as a convenient channel for permeation, conveying and diffusion of corrosive media in the environment.

This invention provides a catalyst coated with a non-precious metal coating on a support and its preparation method. The invention also relates to the application of this non-precious metal coated-supported catalyst in the catalytic oxidation treatment of volatile organic compounds (VOCs). The catalyst of this invention has high mechanical strength, good coating wear resistance, and is not easily detached. Furthermore, the catalyst exhibits strong hydrothermal stability, good catalytic degradation performance of volatile organic compounds, and a long service life, making it particularly suitable for the treatment of VOCs containing sulfides.

The present invention provides a ZSM-23 zeolite and a preparation process thereof. The pore volume of mesopores having a pore size of 3-8 nm of the zeolite is 45-90% of the total pore volume of the zeolite. The zeolite has a relative crystallinity of 95-120%, and the zeolite has a relative crystallinity retention of 95-100% after a hydrothermal treatment with steam for 2 hours at 600°C. The process for preparing the zeolite comprises the following steps: (1) preparing or selecting a silicon source for preparing the ZSM-23 zeolite, such as amorphous silica; (2) performing an alkali treatment on the silicon source for preparing the ZSM-23 zeolite such as amorphous silica mentioned in step (1); and (3) preparing the ZSM-23 zeolite by using the alkali-treated amorphous silica as the silicon source. The ZSM-23 zeolite has a rich mesoporous structure and good hydrothermal stability.

The present invention relates to a catalyst for preparing a light olefin, a preparation method therefor, and a method for preparing a light olefin by using same, and can provide a catalyst for preparing a light olefin, a preparation method therefor, and a method for preparing a light olefin by using same, the catalyst comprising a porous zeolite, a clay, an inorganic oxide binder, and Ag2O and P2O5 which are supported in the pores and / or on the surface of the porous zeolite.

The application relates to a Cu / SSZ-39 catalyst and application thereof, which comprises an SSZ-39 molecular sieve carrier and Cu loaded thereon, the molar ratio of SiO2 / Al2O3 in the catalyst is [5, 50], the molar ratio of Cu / Al is [0.1, 0.5], and the content of aluminum pairs is not less than 88%. The content of aluminum pairs in the prepared SSZ-39 molecular sieve is more than 88%, so that the Cu / SSZ-39 catalyst after loading of copper can withstand the severe hydrothermal treatment condition of 1000 DEG C-10h, that is, the catalyst shows excellent hydrothermal stability, which is much higher than the catalytic performance in the prior art.

The present invention relates to a phosphorus-containing or phosphorus-modified ZSM-5 molecular sieve, which is characterized in that in its 27A1 MAS-NMR, the ratio of peak area for the resonance signal having a chemical shift of 39±3ppm to peak area for the resonance signal having a chemical shift of 54ppm±3ppm is ≥1; or in its surface XPS elemental analysis, the value of n1 / n2 is≤0.1; wherein, n1 represents the mole number of phosphorus, n2 represents the total mole number of silicon and aluminum; the present invention also relates to a cracking auxiliary or cracking catalyst containing said phosphorus-containing / phosphorus-modified ZSM-5 molecular sieve, and a process for preparing the same and use thereof.

The application relates to the technical field of gas separation membrane materials, in particular to application of a self-supporting membrane with a high-water-stability ZIFs interpenetrating composite interface in CO2 capture, and the method comprises the following steps: mixing and uniformly grinding defect type ZIF-67 crystals and ZIF-62 crystals to obtain mixed powder; tabletting the mixed powder to form a self-supporting preform disc; and then performing heat treatment under the protection of an inert atmosphere to obtain the self-supporting membrane with the high-water-stability ZIFs interpenetrating composite interface. The self-supporting membrane can be applied to CO2 capture of real flue gas containing high-concentration water vapor.

The invention relates to the field of molecular sieve preparation, and discloses an SSZ-13 molecular sieve as well as a preparation method and application thereof. The preparation method comprises the following steps: 1) performing a first crystallization reaction on a first mixture containing a first aluminum source, a first silicon source, a potassium source, an organic template agent and water to obtain a potassium type accelerant; (2) a mixture containing a second aluminum source, a second silicon source, an alkali source, an organic template agent, water and the potassium type accelerant is subjected to a second crystallization reaction, a crystallization product is obtained, in the potassium type accelerant, the molar ratio of SiO2 to Al2O3 to K2O to R to H2O is 1: (0.1-0.4): (0.6-1.5): (0.02-0.15): (60-140), and R is the organic template agent. According to the method, the production of the SSZ-13 molecular sieve can be stably realized, the prepared SSZ-13 molecular sieve has relatively dispersed micron-sized crystals which are approximately in a regular hexahedron shape, and a catalyst prepared from the molecular sieve has excellent catalytic activity and good hydrothermal stability at the same time.

The invention provides a composite hollow fiber membrane based on polysulfone and MIL-160 (Al) as well as a preparation method and application thereof, and belongs to the technical field of membrane materials, polysulfone is taken as a continuous phase, MIL-160 (Al) is taken as a dispersed phase, and the hollow fiber membrane with an asymmetric structure is formed; the preparation method comprises the following steps: carrying out activation and ultrasonic pre-dispersion on MIL-160 (Al), introducing the MIL-160 (Al) into a spinning solution containing polysulfone, a solvent and an additive, defoaming, carrying out dry-wet spinning forming, and fully washing and drying to obtain a final product. Through the introduction of MIL-160 (Al) and the synergistic effect of MIL-160 (Al) and polysulfone, the nitrogen-oxygen separation selectivity of the hollow fiber membrane is remarkably improved, meanwhile, the oxygen permeation flux is improved, the process is stable, and the prepared membrane has good mechanical performance and long-term operation stability.

The application relates to the technical field of catalyst preparation, and particularly discloses a one-step synthesis method and application of Cu-SSZ-13 molecular sieve, which comprises the following steps: S1: uniformly mixing inorganic alkali, deionized water, an aluminum source, a silicon source and a template agent to obtain solution A; S2: uniformly stirring the copper source into the solution A, and then placing the solution A in a hydrothermal reaction kettle to perform hydrothermal reaction, so as to obtain a copper-loaded silicoaluminate porous structure; and after washing and drying, performing calcination to decompose the template agent, thereby obtaining the Cu-SSZ-13 molecular sieve. The one-step synthesis method is simple in operation, significantly shortens the preparation period, is low in preparation cost, reduces pollution, is suitable for industrialized production, and the obtained Cu-SSZ-13 molecular sieve has excellent catalytic performance (especially low-temperature activity and hydrothermal stability), and has a wide application prospect in diesel vehicle nitrogen oxide tail gas purification.

This invention relates to a method for the selective catalytic reduction of NO by ammonia. x This invention relates to a catalyst, its preparation method, and its application, belonging to the field of environmental catalysis and air pollution control technology. The catalyst comprises a support, a main active component, and a modifying agent. The support is selected from SAPO-18 molecular sieve, the main active component is selected from Cu, and the modifying agent is selected from Zr. The space velocity is 88,000 h⁻¹. ‑1 At that time, the ZrCu-SAPO-18 molecular sieve catalyst, within the temperature range of 225–450℃, produced NO x The conversion rate reached over 90%; after hydrothermal treatment at 750℃ for 12 hours, NO was reduced within the range of 175–400℃. x The conversion rate remains above 90%. The catalyst of this invention can be used to remove NO from diesel vehicle exhaust and stationary source flue gas. x Highly efficient removal.

The application provides a kind of high hydrothermal stability SSZ-13 molecular sieve and its preparation method and application.The molar ratio (SiO2 / Al2O3) of SiO2 and Al2O3 of the SSZ-13 molecular sieve is 25-100, isolated aluminum accounts for ≥90%, isolated aluminum accounts for higher, has better hydrothermal stability than conventional SSZ-13 molecular sieve.The preparation method provided by the application uses fluorine-containing silicon slag as silicon source, synthesizes SSZ-13 molecular sieve by the process route of activation first and then crystallization, can realize the resource utilization of fluorine-containing silicon slag, can also improve the hydrothermal stability of the prepared SSZ-13 molecular sieve, and the process is simple, suitable for industrial production.

The invention relates to a preparation method and application of an MOFs / MWCNTs composite material adsorbent for CO2 / N2 adsorption separation. According to the method, the high-stability UiO-66-NH2 / MWCNTs composite material is synthesized in situ by adding multi-walled carbon nanotubes (MWCNTs) into the material UiO-66-NH2, and the composite adsorbent is more stable in physical property, higher in adsorption efficiency and better in cycle performance. The UiO series MOFs material selected in the adsorbent disclosed by the invention has good hydrothermal stability, the UiO-66-NH2 / MWCNTs have relatively high BET (Brunauer, Emmett and Teller) surface area and micropore volume, and the adsorbent has good adsorption separation performance.