435 results about "Alumina gel" patented technology

An effective catalyst includes an amorphous silica-alumina support having a bimodal pore size-distribution. The support may be prepared by a method that includes the physical mixing of two silica-alumina gels prepared so as to have two different average pore sizes. The catalyst has the advantage that both metal dispersion on the support and product diffusion in the pores are optimized. Further, the catalyst has improved performance in the production of hydrocarbons from synthesis gas.

The invention relates to a three-way NOx, CO and HC removing catalyst used in a marine engine, and a preparation method thereof. The catalyst takes cerium-tin-tungsten composite oxide as an active component, takes one or more oxides of cobalt, ferrum, nickel, copper, lanthanum, molybdenum, manganese, zirconium, silver and yttrium as a promoter, and takes AlSiTi composite oxide as a carrier. A saturated active component solution, a saturated cobalt promoter ionic solution, strong acid alumina gel, diaspore, clayey, titanium dioxide and an organic forming agent are stirred uniformly, mixed, aged and extruded for formation, and the integral type catalyst is obtained through drying and roasting. According to the invention, the catalyst has high NOx removing efficiency, the active temperature window is wide, and the CO and HC removing efficiency is high in a low-temperature collaborated catalyzing manner. According to the catalyst, as the components of the catalyst are nontoxic and environmental-friendly, the catalyst has the advantages that the mechanical strength is high, the vibration resistance as well as the heat resistance is excellent, the preparation technology is simple, and the cost is low. The three-way NOx, CO and HC removing catalyst is applicable to treatment of NOx, CO and HC in tail gas of a marine diesel engine, and is also applicable to treatment to tail gas of other moving sources diesel engines such as automobiles.

The invention discloses a preparation method of nanometer molecular sieve. The method is to firstly mix hydrocarbon components and surfactants evenly, then add silica gel and silica-alumina gel, and continue to stir until the raw materials are evenly mixed to obtain a super-solubilizing system of oil-in-melt, and then undergo crystallization, drying and roasting Finally, nano molecular sieves are obtained. The crystallization of the molecular sieve in the present invention is carried out in a supersolubilized micelle system of molten silica gel or silica-alumina gel in oil, and the growth of the molecular sieve crystal is limited in the nano-micelle to avoid excessive growth of the molecular sieve crystal. The surfactant and hydrocarbon components used in the method of the invention are used in small amounts and low in cost. The method has a simple process and can be used for large-scale industrial production.

The invention discloses a making method of allitic beta-zeolite, which comprises the following steps: making silica-alumina gel through silicon source and aluminium source under hydrolytic reagent; aging at 20-220 deg. c; roasting at 300-1400 deg. c; grinding the gel into silica-alumina source; adding the solution with ammonium tetraethyl cation, ammonium ion, fluorine ion and water; crystallizing; recycling the crystallized product as zeolite.

A preparation method of the NaY molecular sieve with high silica-alumina ratio includes: preparing the high alkalinity silica-alumina gel (3.0-6.0)Na2O:Al2O3:(7-20)SiO2:(100-600)H2O and the low alkalinity silica-alumina gel (0.5-3.0)Na2O:Al2O3:(7-20)SiO2:(100-600)H2O obtained by evenly mixing conventional directing agent, silicon source, aluminum source and water, heating up the high alkalinity silica-alumina gel to 90-110 DEG C, crystallizing for 0.5-20 hours, adding the low alkalinity silica-alumina gel, filtering, washing, drying and obtaining the NaY molecular sieve. The modified NaY molecular sieve is applicable to the catalyst preparation of catalytic cracking, hydrogen cracking and isomerization.

The invention relates to a molecular sieve preparation method, in particular to a method for synthesizing a ZSM-35 molecular sieve by using a crystal seed method. The method comprises the following steps of: uniformly mixing deionized water and an aluminum source together, adding a potassium source and NaOH, adding white carbon black while stirring, continuously stirring until the solution is uniform and becomes silica-alumina gel, adding a ZSM-35 molecular sieve crystal seed into the silica-alumina gel, and stirring; placing the mixture in a reaction kettle, crystallizing for 3 hours to 5 days at 100-180 DEG C, or crystallizing for 1-10 days at 70-100 DEG C; filtering the product by suction, and drying to obtain the ZSM-34 molecular sieve. The method not only maintains good crystallinity and purity, but also has good catalytic reaction activity. The entire production process not only does not use any organic template agents, but also can greatly shorten crystallization time by using the crystal seed method. Thus, unnecessary loss in the production process is reduced, the product also has larger specific surface area, and the product has potential application value to certain important catalytic reactions. The inorganic raw materials adopted during product are all friendly to environment and cheap.

The invention provides an application and a preparation method of a ZSM-5 molecular sieve with mesopores and micropores. The preparation method includes steps of precursor preparation, silica-alumina gel preparation and preparation of the ZSM-5 molecular sieve with the mesopores and micropores.In a preparation process of a hierarchical porous catalyst, consumption of a microporous templating agent and a mesoporous templating agent can be substantially reduced, synthesis steps of the hierarchical porous catalyst are simple, and the synthesized molecular sieve is large in specific surface area, uniform in particle size and controllable in mesopore quantity and size, and intrinsic lipophilicity of the molecular sieve is enhanced due to abundant surface terminal hydroxide radicals. By adoption of the molecular sieve as the catalyst, a method for preparing cyclohexanol by direct hydration of cyclohexene is established, and the catalyst is high in cyclohexene conversion rate and cyclohexanol selectivity.

The invention relates to a catalyst for cement kiln gas denitration and a preparation method thereof. The catalyst is characterized in that cerium zirconium titanium tungsten composite sulfate is utilized as catalyst active components, one or more of iron, copper, molybdenum or lanthanum oxide is utilized as a cocatalyst, and an aluminum silicon titanium mixing oxide is utilized as a carrier. The preparation method comprises the steps of uniformly stirring a cerium zirconium titanium tungsten composite sulfate precursor, acid alumina gel, pseudo-boehmite, kieselguhr, titanium dioxide and an organic addition agent together, mixing, aging and carrying out extrusion molding on the mixture, and drying and roasting to obtain the integral catalyst. The catalyst provided by the invention has the advantages that the NOx removing efficiency is high, an active temperature window is wide, the catalytic denitration efficiency can achieve 90% above in the range of 280-430 DEG C, and the highest activity can achieve 99.7%; the catalyst has the strong alkali-resisting metal and alkaline earth poisoning capacity and has the high wear-resisting property; the components of the catalyst are non-poisonous and thus the catalyst has an environment-friendly effect; the mechanical strength is high, the preparation technology is simple, the cost is low, and the catalyst is particularly suitable for removing of high dust, high alkali metal and NOx in high alkaline earth smoke of a cement kiln.

The invention relates to a preparation method of a molecular sieve, and aims to provide a seed crystal synthesis method for preparing a ZSM-23 molecular sieve. The method comprises specific steps as follows: mixing water and an aluminum source; adding NaOH; adding a silicon source with stirring; continuing to stir until the solution to forms silica-alumina gel; adding ZSM-23 molecular sieve seed crystal into silica-alumina gel and stirring; then placing the mixture in a reaction kettle, and crystallizing at 140-180 DEG C for 2-50h; and conducting suction filtration and drying on the product to obtain a ZSM-23 molecular sieve raw powder. The whole production process of the invention does not use an organic template agent, greatly shortens crystallization time and lowers crystallization temperature, thus reducing unnecessary loss in the production process. The inorganic materials used in the production are environment-friendly, and low-cost; and the ZSM-23 zeolite molecular sieve synthesized by the invention maintains good crystallinity and purity, and has favorable catalytic reaction activity.

The invention relates to a flexible gamma-Al2O3 fiber membrane and a preparing method thereof. The flexible gamma-Al2O3 fiber membrane is formed by gamma-Al2O3 fibers and has the thickness ranging from 10 to 100 micros, the diameter of the fibers forming the fiber membrane ranges from 70 to 400 nanometers, and the particle size of the Al2O3 particles forming the fibers ranges from 8 to 40 nanometers. Aluminium chloride, aluminum isopropoxide, anhydrous ethanol, tartaric acid and polyvinyl pyrrolidone are prepared into sol spinning solution through the combination of the sol-gel method and the electrospinning technique, so as to make aluminium chloride gel fiber membrane and then make the gamma-Al2O3 fiber membrane by calcining the gel fiber membrane. The aluminium chloride fiber membrane has high flexibility, little possibility of being broken, excellent mechanical property and strong machinability, and can serve as the high-temperature catalyst material, the high-temperature thermal insulation material as well as the high-temperature filtering material. The flexible gamma-Al2O3 fiber membrane has simple process equipment and strong machinability, and is suitable for large-scale production.

The invention relates to silica-alumina hydrogel double-coated modified ammonium polyphosphate and an application thereof to inflaming retarding polypropylene. Double-coated modification is carried out on ammonium polyphosphate by silica gel and alumina gel so that the surface performance of ammonium polyphosphate and the inflaming retarding performance of the system are improved. According to the silica-alumina hydrogel double-coated modified ammonium polyphosphate, tetraethoxysilane, aluminum nitride and ammonium polyphosphate are utilized and absolute ethyl alcohol is used as a dispersant, and the materials are reacted to generate the silica-alumina hydrogel double-coated modified ammonium polyphosphate. The heat stability and the inflaming retarding performance of the modified ammonium polyphosphate and the unmodified ammonium polyphosphate are improved. The prepared silica-alumina hydrogel double-coated modified ammonium polyphosphate and polyamide 6 are cooperated to be commonly used as an expansion type fire retardant which is applied to inflaming retarding of a polypropylene material; and the extreme oxygen index, the UL-94 vertical combustion grade, the heat stability, the charcoal forming capability and the like of the obtained composite inflaming retarding polypropylene material are remarkably improved.

The invention relates to a method for preparing nano flyash zeolite. Flyash is used as a raw material in the method, and the method comprises the following steps of: firstly melting the flyash and sodium hydroxide at high temperature; mixing the molten flyash with concentrated seawater used as a solvent, stirring and aging to obtain silica-alumina gel; crystallizing the silica-alumina gel hydrothermally, and then washing with water to be neutral; and finally drying to obtain a powdery product. Based on the special aperture structure of zeolite, the synthesized zeolite can be applied to catalysis, adsorption, ion exchange and soil improvement. By using the flyash and the concentrated seawater which are both wastes, the method realizes the recycling of the flyash and the concentrated seawater and is a new environment-friendly production method which meets the requirement of sustainable development.

The invention belongs to the technical field of catalysis, and relates to a preparation method of a methane synthetic catalyst carrier, particularly a preparation method of a methane synthetic catalyst carrier existing in the form of magnesia alumina spinel. The method comprises the following steps: independently neutralizing a magnesium soluble salt solution with alkali, washing the obtained precipitate until the precipitate is qualified, mixing with alumina gel and a rare earth metal salt solution to react, drying, pulverizing, roasting, granulating, tabletting to form, and roasting to obtain the methane synthetic catalyst carrier. The carrier prepared by the method provided by the invention has high hydrothermal stability; and the methane synthetic catalyst prepared by using the carrier has the characteristics of high thermal stability, wide temperature range applicability and the like, and can not easily deposit carbon under the conditions of high CO content.

The invention discloses composite dual-microporous material and a preparation method. A guiding agent gel of a Y molecular-sieve is confected first, and then a silica-alumina gel is confected; the guiding agent gel is added in the silica-alumina gel and mixed evenly, and a molecular-sieve seed crystal is added finally; the mixed materials are processed through crystallization for a period of time at low temperature and then are processed through crystallization for a period of time at high temperature after the temperature is raised, and a Y/Beta composite molecular-sieve is obtained through cooling and separation finally. The composite molecular-sieve which is prepared by adopting the preparation method has the high composite advantage of the two types of molecular-sieves, can remarkably increase the medium oil selectivity of the hydrocracking reaction, and can reduce the reaction temperature.

The invention relates to a synthesis method of an NaY molecular sieve. The method includes: mixing water glass, sodium metaaluminate and deionized water, conducting aging at 15-70DEG C for 0.5-48h to obtain a crystallization guiding agent; mixing the crystallization guiding agent, water glass, an acidic aluminum salt and a sodium aluminate solution uniformly to obtain a silica-alumina gel; crystallizing the silicon-aluminum gel at 80-140DEG C for 0.1- 80h; adding a peroxide into the crystallized silicon-aluminum gel, making molar ratio of the 02<2-> in the peroxide to the Al2O3 in the gel at 0.05-20, then further conducting crystallization for 5-20h, thus obtaining the NaY molecular sieve. Without adding any organic or inorganic template and being free of multiple after-treatment modification processes, the method can directly prepare the Y type molecular sieve with a high silicon-aluminum ratio. The obtained molecular sieve has crystallinity up to over 80%, a silicon-aluminum ratio of not less than 5.8, and an average grain size of 200-300.

The invention relates to a SCR-based NO oxidation catalyst and a preparation method thereof. The preparation method of the SCR-based NO oxidation catalyst comprises the following steps: firstly coating the surface of a catalyst carrier with coating slurry containing noble metal Pt by taking cordierite honeycomb ceramic as the catalyst carrier, drying and roasting; and subsequently fixing a certain amount of noble metal Pd solution at one end of the catalyst by using an impregnation method, wherein the amount of the impregnated noble metal Pd solution accounts for 1/3 of the total water absorption amount of the catalyst; the coating slurry is prepared by taking a molecular sieve as an HC adsorption material, taking SiO2 as a dispersing agent, taking zirconium acetate as a thermal stability additive, taking noble metal Pt as an active component and adding an alumina gel adhesive. The preparation method of the SCR-based NO oxidation catalyst is simple in processing steps; the noble metal Pt or Pd is impregnated in the air inlet direction of the prepared catalyst; by virtue of the improved catalyst, the oxidation rate of the NO at the low temperature can be improved, so that the and the temperature window is relatively wide when the NO is oxidized to between 40%-70% in the process of oxidizing NO into NO2; the catalyst is relatively high in stability.

The invention discloses a method for preparing a ZSM-5 zeolite catalyst. The method comprises the following steps: mixing mixed salt solution of a silicon source and a sodium source with aluminum salt solution according to a proportion to form silica-alumina gel, adding the silica-alumina gel and a template agent into a high-temperature high-pressure reaction kettle, and carrying out hydrothermal crystallization for the mixture under set conditions to form the ZSM-5 catalyst. The method is characterized in that during the hydrothermal crystallization, CO2 gas is introduced above the liquid level at proper time to further adjust and control the pH value of a system; during synthesis, the raw material mixing rate, crystallization temperature and crystallization time are controlled so as to effectively solve the problem of grain size control during the preparation of the ZSM-5 zeolite catalyst; and the mean grain size of the prepared zeolite catalyst is 3 to 7mu m, and the range of the grain size is 2.5 to 8mu m. The ZSM-5 zeolite catalyst prepared by the method can be used for the test of preparing cyclohexanol by cyclohexene hydration.

The invention provides a polyvalent inactivity vaccine for preventing and treating atrophic rhinitis of a swine and a preparation method thereof. The polyvalent inactivity vaccine contains inactivated Bordetella bronchiseptica, Pasteurella multocida A, Pasteurella multocida D and PMT (Pasteurella Multocida Toxin) anatoxin. The invention further provides a novel method for culturing and extractingPMT. Compared with the traditional atrophic rhinitis of the swine, the polyvalent inactivity vaccine for the atrophic rhinitis of the swine, provided by the invention, can be used for more generally and effectively treating and preventing the atrophic rhinitis of the swine by comprehensive antigen protection. Finally, in the polyvalent vaccine provided by the invention, the vaccine with a plurality of antigens in a reasonable proportion can be used for solving the problem that the plurality of the antigens interfere each other, thereby improving an immune effect. Furthermore, the inventor provides a water adjuvant by which defects such as incomplete absorption, large side reaction and the like after the traditional alumina gel adjuvant, Freund adjuvant and water-in-oil adjuvant are injected into the water adjuvant can be overcome.

The invention relates to a preparation method of a novel oil-free adjuvant (adjuvant 605) compound and an application of the novel oil-free adjuvant in veterinary vaccines. The adjuvant prepared by using the method provided by the invention is capable of completely taking the place of mineral oil adjuvants and alumina gel adjuvants for inactivated vaccine production; the adjuvant can be completely absorbed by organisms within short time without residual; the adjuvant is low in side reaction, and capable of improving the safety of vaccines, and simultaneously simplifying the vaccine production process and reducing the vaccine production cost. The adjuvant prepared by using the method provided by the invention can be also taken as live vaccine diluting protection liquid, and has the characteristics of protecting the biological activity of the vaccine antigen, enhancing the immune effect of the vaccine, prolonging the persistent period of the vaccine antibody and the like.

The invention provides an adjuvant used for vaccine. The adjuvant comprises alumina gel, levamisole or its derivative, and also polyacrylate. The invention also discloses a vaccine composition containing the adjuvant and an application thereof. The adjuvant can be used as the adjuvant for inactivated vaccine, and also can be used for preparing protein stabilization liquid. The vaccine composition containing the adjuvant can generate humoral immunity for human body and can generate cellular immunity, and can generate good immune response under condition of low antigen content and single immune, and can stabilize protein, degradation and irreversible change cannot be generated.

The invention provides a synthesis method of lamellar ZSM-5 zeolite. The synthesis method comprises the following steps: crystal seed pretreatment, silica-alumina gel preparation and the like. The synthesized zeolite is a typical MFI structure, has the advantages of high crystallinity and large specific area, has the lamellar shape with the lamellar thickness of 50nm or so, and has favorable application potential in the aspects of high-molecular reaction and the like by using the unique shape and physical property characteristics. Compared with the prior art, the synthesis method does not need any organic template or surfactant, has the advantages of simple synthesis technique operation, lower cost, no environment pollution and the like, and thus, can be popularized and applied in industry.

The invention provides a composite submerged nozzle. The composite submerged nozzle comprises an outer layer body, an outer-layer slag line segment and an inner layer, wherein the outer layer body comprises the following components in percentage by weight: 15-35% of crystalline flake graphite, 35-55% of white corundum, 20-50% of aluminum titanate and 8-10% of an external phenolic resin binding agent; the outer-layer slag line segment comprises the following components in percentage by weight: 15-25% of crystalline flake graphite, 45-85% of zirconium oxide, 0-30% of aluminum titanate and 8-10%of an external phenolic resin binding agent; and the inner layer comprises the following components in percentage by weight: 60-90% of aluminum titanate, 10-40% of corundum and 3-5% of an external alumina gel binding agent.

The invention discloses a method for synthesizing a Y/beta composite molecular sieve, comprising the following steps of: firstly carrying out alkali treatment on beta zeolite to prepare a structure-directing agent; stirring inorganic base, an aluminium source, a silicon source and water according to the mole ratio of 8-17Na2O: 30-100SiO2:Al2O3: 800-2100H2O so as to synthesize an initial silica-alumina gel, adding the structure-directing agent and a Y molecular sieve, and crystallizing at the temperature of 100-170 DEG C for 20-80 hours so as to obtain the product. By the adoption of the method, the structure-directing agent greatly raises directing efficiency of beta zeolite crystal seeds, sharply reduce the amount of beta zeolite and simultaneously significantly improve crystallization degree of the beta molecular sieve in the synthesized composite molecular sieve. The method provided by the invention is simple and easy to operate. Raw materials are cheap, easily available and nontoxic and harmless such that the use of expensive and toxic organic template raw materials is avoided. Therefore, production cost is significantly reduced, and the whole preparation process is green and environmental friendly.

The invention relates to a gamma-alumina nanotube which has a single-crystal structure with the length of 100-200 nanometers and an external diameter of 8-10 nanometers. The gamma-alumina nanotube has a prior exposure of (111) crystal face, and has a hydroxyl density of 1.99mmol/g and acid density of 0.489mmol/g. The invention has the beneficial effects that the gamma-alumina nanotube with the prior exposure of (111) face is prepared by orderly assembling crystallized alumina gel by utilizing the assembling function of inexpensive surfactants, and has a single-crystal structure; the gamma-alumina nanotube with the prior exposure of (111) face has high hydroxyl density and acid density; the invention has simple process which is applicable for large-scale production and has little pollution. The invention also discloses the preparation method thereof.