214 results about "Sio2 al2o3" patented technology

The invention provides a catalyst for continuously producing butanedioic anhydride by maleic anhydride hydrogenation. The catalyst is a nickel loaded catalyst prepared by an equivalent-volume impregnation method, wherein in the catalyst, the content of nickel is 13 to 20 weight percent, the content of accelerating agent is 1 to 7 weight percent, and a carrier is a composite oxide of SiO2 and Al2O3 or SiO2-Al2O3. A preparation method for the catalyst comprises the following steps: impregnating impregnation solution blended by ammonia water and active metal salt solution on a carrier subjected to baking pretreatment at a temperature between 400 and 800 DEG C by the equivalent-volume impregnation method to form the catalyst through drying, baking and reducing treatment. The catalyst is applied to continuously preparing the butanedioic anhydride by maleic anhydride hydrogenation on a fixed bed reactor, the conversion rate of maleic anhydride is more than or equal to 99.98 percent, and the selectivity of the butanedioic anhydride is more than or equal to 98.85 percent. The catalyst achieves the technical-scale continuous production of the butanedioic anhydride, and has the advantages of high activity, good selectivity, high yield (more than or equal to 98.83 percent) and long service life.

The invention relates to a method for preparing 1,3-propylene glycol by directly hydrogenizing glycerol. A reaction system comprises glycerol, hydrogen, catalyzer and two or more of dissolvants. In the reaction system, the weight ratio of the dissolvants to the glycerol is 0.2-9.8:1, and the weight ratio of the catalyzer to the glycerol is 0.2-2:1; the reaction conditions are shown as follows: the reaction temperature is 80-300 DEC G, the hydrogen pressure is 0.1-18.0MPa, and the contact time of the glycerol and the catalyzer in the reaction process is 0.3-50h; the catalyzer contains a carrier and active components carried on the carrier, wherein the carrier is ZrO2, SiO2-Al2O3 or Al2O3, and the active components are one or more of Ru, Pt, Pd and Rh. The invention can obviously increase the selectivity of generating 1,3-propylene glycol by hydrogenizing glycerol or increase the percent conversion of glycerol and reduce the generation of the byproduct of 1,2-propylene.

The disclosed catalyst special to low-grade diesel fuel hydrotreatment comprises: given the catalyst, 1-70wt% SiO2-Al2O3 with quasi-thin diaspore structure, 1-60wt% Y-form molecular sieve, and 5-80wt% Al2O3; wherein, given the oxide, 1-15wt% VIII metal constituent, and 10-40wt% VIB metal constituent. The product is prepared by mixing, forming, baking and then adding at least one of former metal constituent.

The invention relates to a method for preparing monohydric alcohol or dihydric alcohol through organic acid hydrogenation. According to the method, any one of acetic acid, propionic acid, valeric acid, stearic acid, oleic acid, palmitic acid, levulinic acid, lactic acid, succinic acid, 3-hydracrylic acid and other organic acids is taken as a reactant, and an A-B/X supported catalyst is adopted, wherein the component A is any one or more than two from Ir, Pt, Pd, Rh and Ru, the assistant B is any one or more than two from Mo, Re and W, the carrier X is any one in SiO2, activated carbon, titanium oxide, zirconium oxide, SiO2-Al2O3 (the mass content of Al2O3 accounts for 17 percent) and molecular sieves, the mass load amount of A in the catalyst is 0.5-10 percent, the molar ratio of the assistant B to A is 0.01-1.0, the reaction pressure is 2-20 MPa, and the reaction temperature is 40-180 DEG C. The catalyst has the characteristics of mild reaction conditions, high reaction activity and good selectivity, and a novel effective way for preparing monohydric alcohol or dihydric alcohol from biomass is provided.

The invention belongs to the field of cleaning of the tail gas of a diesel engine, and particularly relates to a sectional type ammonia generating device for discomposing solid urea, wherein the device can be used for treating the tail gas of a motor vehicle. The device consists of an ammonia reaction tank, an urea pyrolysis catalysis device and an isocyanic acid hydrolysis catalysis device, which are sequentially arranged in the ammonia reaction tank according to an airflow direction; the front end of the ammonia reaction tank is provided with an urea inlet, the back end of the ammonia reaction tank is provided with an ammonia outlet, and a steam transporting conduit is arranged nearby the urea inlet; the urea pyrolysis catalysis device is formed by a multi-layer wire mesh carrier which is coated with a glass coating layer SiO2-Al2O3 and loaded with a urea pyrolysis catalyst Pt, Ag or Pd; and the isocyanic acid hydrolysis catalysis device is formed by a metal honeycomb carrier coated with the isocyanic acid hydrolysis catalyst SiO2-Al2O3. Due to the urea pyrolysis catalyst and the isocyanic acid hydrolysis catalyst, the device is used for catalyzing each stage of ammonia generation by ammonia, so that the reaction temperature can be reduced, the reaction can be accelerated, and the energy can be saved.

The invention provides a non-oriented electrical sheet steel with good iron loss, which is characterized in that the non-oriented electrical sheet steel with good iron loss comprises the following components in percentage by weight: C: <= 0.003%, Si: <=1.0%, Mn: <=0.20%, Al: <= 0.001-0.009%, S: <=0.004%, N: <=0.003%, Ti: <= 0.0020%, Al/Si: 0-0.006 and Mn/Si: 0-0.2, wherein the proportion of three element inclusion SiO2-Al2O3-MnO is as follows: SiO2: >=95%, Al2O3: 2-3% and MnO: <=2%, and the balance Fe and inevitable impurities. The invention also provides a manufacturing method for the steel. An optimal component range of Si, Mn and Al is set through research, the level of the oxidized inclusion and precipitates are controlled, growth of grains is promoted and the non-oriented electrical sheet steel with low iron loss is obtained.

The invention relates to a preparation method of a mullite-fibrofelt-reinforced SiO2-Al2O3 aerogel composite heat-insulating material, which comprises the following steps: by using surface-pretreated mullite fibrofelt as a reinforcer, tetraethyl orthosilicate as a silicon source, cheap inorganic aluminum salt as an aluminum source and epoxide as a network formation agent, uniformly mixing, and carrying out sol-gel, aging and supercritical drying to obtain the mullite-fibrofelt-reinforced SiO2-Al2O3 aerogel composite heat-insulating material. In the preparation process, no catalyst is needed, and a one-step method is adopted to greatly optimize the preparation technique. Thus, the heat-insulating material has the advantages of low cost, smooth surface and controllable thickness, and can resist the temperature of 1200 DEG C in an air atmosphere. The room temperature thermal conductivity is 0.023-0.027 W.m<-1>K<-1>, and the apparent density is 0.18-0.22 g/cm<3>. The method has the advantages of simple materials, low cost and simple technique, is simple to operate in the technical process, and can easily implement large-scale production.

The invention relates to biological microcrystalline glass prepared by utilizing phosphate tailings and a preparation method thereof. The biological microcrystalline glass comprises the following raw materials in parts by weight: 30 to 35 parts of the phosphate tailings, 15 to 25 parts of quartz sand, 10 to 16 parts of aluminium hydroxide, 20 to 28 parts of calcium hydrophosphate, 9 to 13 parts of calcium fluoride, 0 to 5 parts of magnesium oxide, 0 to 5 parts of zinc oxide and 0.5 part of sodium borate, wherein the utilization rate of the tailings reaches more than 30%. Compared with a product produced by utilizing conventional chemical raw materials, the biological microcrystalline glass has better physical and chemical properties and realizes reduction in the raw material cost by more than 30%. Based on the SiO2-Al2O3-P2O5-CaO-CaF2 system, the magnesium and the zinc are utilized to replace the partial calcium, so that a new magnesium-series wagnerite phase and a zinc-series zinc pointed crystal phase are generated, and therefore, the brittleness of the biological microcrystalline glass is improved while the mechanical strength is improved. In addition, the biocompatibility, the bioactivity and the chemical stability of the biological microcrystalline glass are improved.

A ordered porous molecule sieve having a super high hydrothermal stability and a formula of SiO2-Al2O3-MxOy, wherein Al/Si=0-1.0, M/Si=0-0.05, M=Fe3+, B3+ and a completely condensation of siliceous species on the pore wall, Q4/Q3 =3-7, can be synthesized according to the steps of 1) making a pattern plate reagent 2) preparing raw powder 3) getting rid of the pattern plate reagent. Particularly, making pattern plate reagent includes mixing the F-C surfactant with C-H surfactant, dissolving them in water, making the PH below 1 or 8-10. Crystallizing temperature is of 160-250 deg.C. to obtain the raw powder.

The invention provides a core-shell structure magnetic micro-spherical alumina MeFe2O4-SiO2-Al2O3 and the preparation method. According to the positioning effect of the LDHs laminated metal element, the invention firstly prepares the Me-Fe2+-Fe3+-LDHs laminated precursor by introducing the Me2+, Fe2+ and Fe3+ into the hydrotalcite laminate, and the spinel ferrite MeFe2O4 is formed by high-temperature roasting; the Na2SiO3.9H2O or silicon ester hydrolysis is adopted to coat a SiO2 protection layer on the surface of the MeFe2O4, the organic alcohol aluminum hydrolysis method is adopted to coat the alumina layer for a plurality of times, and finally the magnetic micro-spherical alumina MeFe2O4-SiO2-Al2O3 is obtained. The method saves the forming process of the traditional preparation method, and adjusts the magnetic structure and pore structure of the samples by changing the thickness of the SiO2 protection layer and the adding quantity of the magnetic object MeFe2O4 for meeting the application requirement of the magnetic stable bed process.

The invention discloses a preparation method of a low-temperature long-time oxidation-resistant coating layer on carbon/carbon composite material surfaces, and belongs to the technical field of carbon/carbon composite material antioxidation. The preparation method comprises following steps: firstly, chemical vapor deposition is adopted so as to realize precipitation of high crystallinity silicon carbide on the carbon/carbon composite material surfaces as a transitional inner coating layer; boron oxide, boron carbide, silicon dioxide, and aluminium oxide are taken as coating layer raw materials, silica sol is taken as an adhesives, and painting-sintering technology is adopted so as to obtain a B4C-B2O3-SiO2-Al2O3 outer layer on the silicon carbide inner layer; and finally the SiC/B4C-B2O3-SiO2-Al2O3 composite oxidation-resistant coating layer is formed on the carbon/carbon composite material surfaces. The low-temperature long-time oxidation-resistant coating layer is capable of realizing long-term antioxidation of the carbon/carbon composite material at 600 to 1000 DEG C, and oxidation weight loss ratio is smaller than 1%. It is observed via observation using scanning electron microscopes, the low-temperature long-time oxidation-resistant coating layer is capable of forming compact glass phase at usage environment spontaneously, and realizing oxidation protection.

The invention discloses a preparation method of a catalyst to produce methyl methacrylate efficiently at low cost. The catalyst is made by a polymeric protection process and is a supported catalyst with an active center supported on a support; the active center includes gold and a rare-earth metal; the support is one of SiO2, SiO2-Al2O3, CaCO3, carbon material, and molecular sieve material; the catalyst is 0.05-0.98% by weight in gold loading capacity and 1-2.5% by weight in rare-earth metal loading capacity. The preparation method is suitable for preparing a gold particulate catalyst having uniform particle size and high activity; the preparation process is simple; the preparation method is convenient to perform; active component loading capacity is low; the catalyst has excellent activity and good stability; the catalyst is prepared at low cost; methylacrolein conversion rate and MMA (methyl methacrylate) selectivity are high; the preparation method is suitable for industrial production.

The invention discloses a medium-oil-type hydrocracking catalyst to furthest produce medium fractional oil. It disperses a Y-shaped zeolite in unformed SiO2-Al2O3 base material as catalyst carrier. It contains 5w%-25w% Y-shaped zeolite in which SiO2/Al2O3 mol ratio is 40-60, 20w%-50w% unformed SiO2-Al2O3, 15w%-30w% bonding agent, 10w%-30w% VIB-family metal, and 4w%-10w% VIII-family metal, the atomic ratio of VIB/(VIB+VIII) equal to 0.3-0.8.

The invention relates to a method for preparing a novel A-B/X or A/X carried catalyst of 1,5-pentanediol by performing a selective hydrogenolysis reaction on tetrahydrofurfuryl alcohol obtained from forestry and agricultural residues taken as raw materials. According to the novel A-B/X or A/X carried catalyst, wherein the component A is any one or more than one of Rh, Ir, Pt, Pd and Ru; the assistant B is any one or more than one of V, Nb and Ta; the carrier X is any one of SiO2, activated carbon, SiO2-Al2O3, titanium oxide and zirconium oxide; the carrying quantity of a precious metal A in the catalyst is between 0.5% and 10%; the molar ratio of the assistant B to the precious metal A is 0.01-1.0; the reaction pressure is between 1MPa and 20MPa; and the reaction temperature is between 50 DEG C and 150 DEG C. The novel A-B/X or A/X carried catalyst has the characteristics of moderate reaction condition, high reaction activity and good selectivity, thereby providing a novel effective way for preparing the 1,5-pentanediol by utilizing biomasses of the forestry and agricultural residues.

The invention discloses porous ceramic prepared by adopting different inorganic binders, which comprises the following raw material components: inorganic binders, aggregates and pore forming materials, wherein the mass ratio of the inorganic binders, the aggregates to the pore forming materials is 3 : 17 : 2; the raw material components of the inorganic binders are CaO-MgO-SiO2-Al2O3-TiO2 system glass, feldspar and clay, and the mass proportional range of the components is 29.24-100 : 0-47.14 : 22.32-61.74. According to the invention, different cheap inorganic binders are used for connecting aggregates to prepare the porous ceramic which has high strength and high air porosity, and can be applied to filtration and separation, so that the overall performance is excellent, the maximum bending strength can reach 33.34 MPa, and the apparent porosity is 48.25%.

The invention provides a method for preparing a catalyst for removing CO from a hydrogen-rich atmosphere by selective oxidation. The catalyst is characterized in that the carrier thereof adopts Al2O3 or SiO2-Al2O3 with the weight percentage of SiO2 being 3-40%; and the active component thereof is one or more than one selected from the following noble metal elements: Ru, Rh, Pd and Pt. Based on a metallic colloid method, the method of the invention for preparing the catalyst comprises the following steps: adding surfactant to the aqueous solution of metal salt of the active components in the noble metal elements; slowly adding reducing agent drop by drop while stirring intensely, so as to obtain stable noble metal colloid with the particle size thereof being 2-10nm through reduction by a reducing agent; properly regulating loading conditions and loading the noble metal colloid onto the carrier, so as to obtain a loading-type metal colloid catalyst; and subjecting the metal colloid catalyst to room-temperature airing, oven-drying and reducing, to obtain the finished catalyst.

The invention relates to an inorganic-organic compound hole sealing coating comprising two parts of a hole sealing layer and an anti-fouling layer, wherein the hole sealing layer is formed by an inorganic hole sealing agent through a dipping-pulling method and a thermal processing method on a test sample after surface processing, the anti-fouling layer is formed by an organic anti-fouling agent through the dipping-pulling method and the thermal processing method on the hole sealing layer, and the inorganic hole sealing agent is an SiO2-Al2O3 colloidal sol hole sealing agent; the organic anti-fouling agent is polytetrafluoroethylene diluent which is prepared by taking polytetrafluoroethylene dispersing liquid, distilled water and a non-ionic type surfactant as raw materials. The preparationmethod of the inorganic-organic compound hole sealing coating provided by the invention comprises two parts of preparing the inorganic hole sealing layer and preparing the organic anti-fouling layer.The inorganic hole sealing layer provided by the invention can obviously lower the porosity of the coating and obviously enhance the erosion resistance performance and the high-temperature resistanceperformance of the coating; the organic anti-fouling layer can effectively lower the surface energy of the coating, enables stains not to be easy to attach to the surface of the coating and has favorable anti-fouling function.

The present invention is efficient oxidizing catalyst for organic waste water treating and its preparation process and application. The carrier prepared with composite powder of Ti, Si, Al and RE oxide and in the average granularity smaller than 100 nm is loaded with at least two kinds of transition metal to prepare the catalyst. The catalyst contains TiO2-SiO2-Al2O3 65-85 wt%, RE oxide 5-15 wt%, and transition oxide 5-30 wt%. The preparation process of the catalyst includes preparing carrier powder with the carrier components and through precipitation, homogenization, ageing, filtering, washing, pulping, dispersing, fluidizing at supercritical condition to eliminate water and activating; forming the carrier, soaking, fluidizing and drying, and activating to obtain the catalyst. The catalyst is used in acid organic waste water treatment and has COD degrading rate higher than 95 %, ammonia nitrogen oxidizing conversion rate higher than 99 % and chroma eliminating rate higher than 95 %.

A process for preparing the composite organic-inorganic membrane by self-assembling technique includes such steps as mixing ethyl silicate, de-ionized water, absolute alcohol and acid catalyst, heating to obtain SiO2 sol, ageing, coating it on the one surface of Al2O3 ceramic substrate, drying, calcining, washing to obtain SiO2-Al2O3 substrate, preparing poly-cationic electrolyte solution and poly-anionic electrolyte solution by use of hydrochloric acid, immersing the SiO2 side of said substrate in the poly-cationic solution and washing with clean water, immersing in polyanionic solution and washing with clean water, and repeating said alternative immersing and washing steps to form nano-class compact membrane layer.

The invention relates to a rare-earth meidum slurry of rare-earth circuit, based on the metal base board and a relative production, wherein it is characterized in that: said slurry is formed by solid material and organic solvent carrier, while their mass ratio is 70-90:30-10; the solid component is the glass in SiO2-Al2O3-CaO-B2O3-Bi2O3-La2O3 group, and the components of each oxidant have the mass percentages as: SiO2(30-65%), Al2O3(5-26%), CaO(18-38%), B2O3(2-16%), La2O3(0.3-15%), Co2O3(0.05-6%), TiO2(1-10%), ZrO2(1-10%). And the production comprises: (1), preparing rare-earth micro-crystal glass powder; (2), preparing organic solvent carrier; (3), mixing material in three-dimension and rolling with three rollers; (4), preparing medium slurry; (5), preparing the rare-earth slurry; (6), bottling. The invention is environment friend, better sinter property, better print property, and better humidity compatibility.

The invention provides an LTCC (low-temperature co-fired ceramic) material with a low dielectric constant, low loss and a near-zero-temperature coefficient and a preparation method. According to the LTCC material, on the basis of a BaSO4 ceramic powder, glass of a BaO-B2O3-SiO2-Al2O3 system is adopted for assisted combustion to reduce sintering temperature, and TiO2 is adopted for adjusting a resonance frequency temperature coefficient, so that 900 DEG C low-temperature sintering can be realized. Under 60GHz, the dielectric constant of the LTCC material is 5.5-9, the low dielectric loss is smaller than 2*10<3>, and the near-zero-temperature coefficient is tua f-+/-10ppm/DEG C. In addition, the preparation method has the advantages of cheap production raw material, low production cost and simple preparation process. The LTCC material can be applied to manufacture of microwave devices such as low-temperature co-fired ceramic systems, multilayer dielectric resonators, microwave antennas and filters, and has high application value in industry.