417results about How to "Improve anti-sintering performance" patented technology

The invention discloses a copper based catalyst used for hydrogenating carbon dioxide to synthesize methanol, and a preparation method and an application thereof. The preparation method of the catalyst comprises the following steps: 1, processing a zinc salt, an aluminum salt, a zirconium salt and a stabilizer to prepare a first solution, or processing the zinc salt, the aluminum salt and the zirconium salt to prepare a second solution; 2, processing carbonate and hydroxide to prepare a third solution; 3, processing a copper salt to prepare a fourth solution; 4, processing the first solution and the third solution to form a first precipitation solution, or processing the second solution and the third solution to form a second precipitation solution; 5, adding the fourth solution to the first precipitation solution to form a third precipitation solution or adding the fourth solution to the second precipitation solution to form a fourth precipitation solution, ageing after Cu in the precipitation solution precipitates, and washing; and 6, drying, and calcining. The catalyst contains 30-50% of Cu, 20-40% of Zn, 10-20% of Al, and 5-20% of Zr. The catalyst is used for a reaction for hydrogenating carbon dioxide to synthesize methanol.

The invention provides a VOCs (volatile organic chemcials) catalytic combustion integral catalyst, and belongs to the technical field of catalysts. The VOCs catalytic combustion integral catalyst is prepared from the following raw materials in parts by mass: 82 to 87 parts of cordierite honeycomb ceramic carrier, 10 to 14 parts of gamma-Al2O3, 0.8 to 1.5 parts of oxide additive, and 0.01 to 0.05 part of active component Pd, wherein the gamma-Al2O3, the oxide additive and the active component Pd are used as coating layers. The invention also relates to a preparation method of the catalyst. The preparation method comprises the following steps of firstly, dispersing the Pd onto the special gamma-Al2O3 carrier, drying, and calcining, so as to obtain powder; adding an adhesive, a lubricant and water for preparing slurry, coating the cordierite honeycomb ceramic carrier with the slurry, drying and calcining, so as to obtain the catalyst. The catalyst has the characteristics that by using low-content noble metal Pd as the active component, the cost is low, the low-temperature ignition is quick, the anti-vulcanizing and anti-aging properties are realized, the catalyst is suitable for large air volume and high air speed, the dispersion property is good, the easiness in sintering is avoided, and the like; the catalyst is especially suitable for the catalyst combustion of sulfur-containing VOCs.

The invention discloses a catalyst for synthesising methanol by hydrogenation of carbon dioxide. The catalyst is composed of oxides with the following molar ratio based on metal: 20-50% of La, 0-10% of M, 15-35% of Cu, and 2-15% of Zn, wherein M is one or more of Zr, Y, K, Ag, Ce, Pd, Mn, Mg, Fe, Co, Ni or Cr. The catalyst disclosed by the invention has the advantages that preparation is simple, operation is easy, catalyst performance repeatability is good, industrial amplification is easy to realize, and reaction conversion rate and reaction selectivity are high.

The invention relates to a gamma-form alumina loaded metallic oxide catalyst as well as a preparation method and application thereof. The gamma-form alumina loaded metallic oxide catalyst is prepared by adopting an immersion method. The particular preparation method is explained in the specification. The gamma-form alumina loaded metallic oxide catalyst disclosed by the invention has the advantages of adjustable pore structure, large specific surface area, good absorption property, high mechanical strength, good surface acidity and heat stability, and the like. The gamma-form alumina loading metallic oxide catalyst disclosed by the invention is used for carrying out simultaneous desulfuration and denitration on a flue gas and catalytic reduction on nitric oxide and sulfur dioxide which are contained in the flue gas by adopting CO as a reducing agent, and is particularly used in the field of processing of an FCC (Fluid Catalytic Cracking) flue gas and the flue gas of a power station boiler.

The invention relates to a cerium-molybdenum-zirconium (Ce-Mo-Zr) composite oxide catalyst. The molar ratio of Zr to Ce in the catalyst is 1:2, and the molar ratio value of Mo to Ce is 0.1-1.5. By the adjustment of the ratio of the three elements, namely cerium, molybdenum and zirconium, the catalyst which is wide in temperature window, high in conversion rate and excellent in temperature resistance and sintering resistance, and is used for converting nitrogen oxides is obtained; the preparation process is simple, the cost is low, and the realization of the industrialization is facilitated.

The invention belongs to the technical field of inorganic nano-material preparation, and particularly discloses a preparation method of nano-alumina; the method comprises the following steps: preparing a aluminium nitrate alcoholic solution A with a concentration of 0.10-0.50 g/ml; preparing an ammonium carbonate or ammonium bicarbonate aqueous solution B with a NH4 concentration of 1-4 mol/L; adding a proper amount of organic acids into the solution A under stirring at 60-80 DEG C, adding the solution B into the solution A under stirring, stopping adding the solution B till the pH of the reaction system reaches a target pH value, uniformly stirring to obtain a sol C; continuing stirring the sol C for 2-15 hours, aging at 60-80 DEG C for 15-60 hours; filtering the aged sol C, drying and roasting the solid obtained after filtration so as to obtain the product. The morphology of the product can be controlled by the pH value of the reaction system, and the pore distribution is adjustable; therefore the product is especially suitable to be used as a carrier of a Fischer-Tropsch synthesis catalyst.

The invention discloses a yttria stabilized zirconia powder with low impurity content and a preparation method thereof. The yttria stabilized zirconia powder is a composite powder with a nanostructured shell cladding nanometer particles. The preparation method comprises the following steps of: carrying out low temperature drying by the use of a nanometer YPSZ amorphous powder synthesized by a continuous coprecipitation method; carrying out ball milling dispersion on parts of the nanometer YPSZ powder which has undergone crystalline conversion, and carrying out spray drying granulation, screening and calcining on dispersed slurry; and carrying out plasma densification treatment, drying and screening on the calcined powder so as to finally obtain the spherical powder with the nanostructured shell cladding nanometer particles. The YPSZ powder for thermal spraying has very low impurity content, and the content of a single impurity is lower than 100 ppm. A compact shell is formed outside the nanometer YPSZ agglomerate particles, thus raising apparent density and fluidity of the agglomerate powder and increasing the melting effect of the powder in plasma.

The invention discloses a molecular sieve catalyst for preparing propylene by propane dehydrogenation and a preparation method of the molecular sieve catalyst, and belongs to the field of preparationof catalysts. The catalyst consists of a component A and a component B, wherein the component A is one of metal elements Sn, Ga, Fe, Co, Ni or Zn, the use amount of the component A is 1-9wt% of the total amount of the catalyst, the component B is a molecular sieve carrier, and the use amount of the component B is 90-99wt% of the total amount of the catalyst. The preparation method of the catalystcomprises a direct hydrothermal synthesis method and an impregnation method. The high-performance alkane dehydrogenation catalyst is prepared by controlling the use amounts, the structures and the dispersity of active components, has the characteristics of simple preparation process, low price and no toxicity, and has the characteristics of good activity, high selectivity, high stability and the like when applied to preparation of propylene through propane dehydrogenation; and a new technical scheme is provided for development and preparation of a new-generation alkane dehydrogenation catalyst.

The invention discloses a double-layer thermal barrier/high-temperature low-infrared emissivity integrated coating which is of a multilayer superposition structure. The multilayer superposition structure sequentially comprises a metal bonding layer, a thermal barrier ceramic inner layer, a thermal barrier ceramic outer layer and a low-infrared emissivity layer from inside to outside, and the thermal barrier ceramic inner layer is La2Zr2O7-8YSZ mixture layer, wherein the mass fraction of La2Zr2O7 powder in the mixture is not more than 45%, the thermal barrier ceramic outer layer is a rare earthzirconate layer, and the low-infrared emissivity layer is a Bi2O3-Al2O3-ZrO2-CaO-SiO2 glass coating comprising conductive phase AuPt alloy powder. The invention also provides a metal composite material with the coating and a preparation method thereof. The integrated coating has the characteristics of heat insulation performance, high-temperature low infrared emissivity, excellent thermal shock resistance and the like.

The invention discloses a pyrochlore structural rare-earth zirconate material system capable of being used for a heat barrier coating. The chemical composition of the material is (0.5-x)R'2O3-0.5Sm2O3-xR''2O3-2ZrO2, wherein x is more than 0 and less than or equal to 0.25; the R' is rare-earth elements or composition thereof, the ion radius of which is greater than that of Sm; and R'' is rare-earth elements or composition thereof, the ion radius of which is smaller than that of Sm. The material provided by the invention has low thermal conductivity, high thermal stability and high-temperature sintering resistance; the thermal expansion performance of the material is stable compared with a single pyrochlore structural material; and the material is favorable for reducing thermal stress generated by mismatching of thermal expansion coefficients in the thermal cycle process, and can prolong the thermal cycle life of the coating. Because of good high-temperature phase stability, the pyrochlore structural rare-earth zirconate material can be used for designing and preparing a novel high-temperature heat barrier coating material, the use temperature of which is below 1,550 DEG C.

The invention relates to a catalyst used for producing olefin through low-carbon alkane dehydrogenation, and a preparation method thereof. The invention mainly aims at solving the problems of low activity and poor stability of dehydrogenation catalysts prepared with prior arts. The low-carbon alkane dehydrogenation catalyst provided by the invention is prepared through an impregnation precipitation method, and comprises the following components, by weight: (a) 0.1-5 parts of Pt or oxide thereof, (b) 0.1-5 parts of Sn or oxide thereof, (c) 0.1-5 parts of alkali metal or oxide thereof, (d) 0.1-5 parts of Fe, Co, Ni, Cu, Zn or oxide thereof, (e) 0.1-10 parts of a Ce-La-O solid solution, and (f) 80-99 parts of a carrier Al2O3. With the above technical scheme, the problems are well solved. The catalyst can be applied in industrial productions for producing low-carbon olefin through low-carbon alkane dehydrogenation.

The invention discloses a hydrogenation and metal removing catalyst preparation method, which comprises: (1) impregnating a physical pore expanding agent by using a silicon-containing solution, carrying out mixing kneading on the physical pore expanding agent, pseudo-boehmite, an auxiliary extrusion agent and a glue solvent after the impregnating to form a plastic body, extruding strips, drying, calcining the dried material in a nitrogen atmosphere, and then calcining in an air atmosphere to produce a silica-containing alumina carrier; and (2) impregnating the carrier by using a hydrogenation activity component impregnating liquid, drying the material, and calcining to prepare the hydrogenation and metal removing catalyst. According to the present invention, the catalyst prepared through the method has advantages of high mechanical strength, suitable pore structure, high catalytic activity, and high activity stability.

The invention relates to a preparation method of a nickel-based catalyst, the prepared catalyst and an application thereof. The invention relates to a method for preparing a nickel-based catalyst. The nickel-based catalyst comprises NiO, carrier, at least one rare-earth oxide RE2O3 and selectable MnO2. The method comprises the following steps: (a) providing a mixed aqueous solution containing nickel salt, selectable non-aluminum carrier metal salt and selectable manganese salt; (b) carrying out sediment with a precipitating agent, and carrying out solid-liquid separation to obtain solid precipitate; (c) mixing the solid precipitate and a rare earth salt solution to from a mixed solution, and dipping; (d) carrying out solid-liquid separation on the steeping liquid to obtain impregnant solids, and electively uniformly mixing the impregnant solids with alumina sol; (e) carrying out granulation and selectable drying; (f) roasting under the condition that the carrier is added in at least one step of the step (a) and step (d). The prepared catalyst has excellent activity and selectivity.

A method to modify calcium based carbon-dioxide absorbent is that the prepared water solution of ethanol/KMnO4 is arranged in a container under the condition of normal temperature and normal pressure. The calcium based absorbent is calcined for one to two hours, and CaO particles generated are gradually added into the water solution of ethanol/KMnO4, and are stirred all along. After the mixture is stirred for one hour, the reaction product is dried, thus getting the high performance calcium based carbon-dioxide absorbent. The method can be applied in the process of removal of carbon dioxide in large scale by circulated calcination/carbonation during combustion or gasification of fossil fuel, and ethanol can be reclaimed and recycled according to the theory that the boiling points of ethanol and water are different. According to research, the modification method improves the caking resistance and the carbonation capacity of the calcium based absorbent during long circulated calcination/carbonation. With simple and convenient operation, the modification method needs low investment and cost, and is prospective in industrial application.

The invention discloses a preparation method of a SiO2-coated core-shell structure catalyst, which belongs to the technical field of natural gas chemical industry and coal chemical industry, and mainly solves the problems of easiness in sintering and carbon deposit of the catalyst in the catalysis process. The preparation method of a SiO2-coated Ni/ZrO2@SiO2 core-shell structure catalyst for synthesis gas obtained by partial methane oxidation is characterized by comprising the following steps: preparing nano-scale Ni/ZrO2 particles by using a co-precipitation method; treating the surfaces of the particles by using polyvinylpyrrolidone, and performing ultrasonic dispersion in the alkaline environment; adding a soluble silicon source; performing centrifugal collection, water washing, alcohol washing, drying, roasting and reduction to obtain the Ni/ZrO2@SiO2 core-shell structure catalyst. The Ni/ZrO2@SiO2 core-shell structure catalyst prepared by using the process method has excellent anti-sintering and anti-carbon deposit performances in the partial methane oxidation reaction of the synthesis gas.

An electric catalyst used for proton exchange membrane fuel cells, active component is Pt or PtRu, auxiliary component is titanium oxide; the atom ratio of platinum and titanium is 0.01-99, the atom ratio of platinum and ruthenium is 0.01-99, the particle size of the active component is 1-20nm. The active component can be impregnated in the titanium oxide modified porous conductive material, gained support-type electric catalyst, which contained activity group sharing percentage for the quality of 1-99%, the atom ratio of platinum and titanium is 0.01-99. Active components can be added as a percentage of 0-99% of the auxiliary components, become a multi-component catalysts; adding auxiliary components was transition metal or a transition metal oxides or several. Preparation methods can be used colloidal law or impregnation - Reduction Act. The invention of the electric catalyst can be used in proton exchange membrane fuel cells.

The invention relates to the technical field of denitration, in particular to a selective catalytic reduction denitration catalyst, a preparation method and application thereof. The catalyst is prepared from a carrier, transition metal oxide loaded on the carrier, and a rare earth modification additive, as well as a rare earth metal polymer distributed on the carrier as a porous mesh metal frame structure, wherein the total load capacity of the transition metal oxide, the rare earth modification additive and the rare earth polymer on the carrier is 25-35%. The catalyst disclosed by the invention is excellent in catalytic activity at a temperature interval from 200 DEG C to 400 DEG C; the denitration conversion ratio can be up to 90% above; meanwhile, the trace of rare earth modification additive is added to the catalytic system to effectively improve the sintering resistance of the catalyst; the catalyst can effectively improve the lead and sulfur toxic resistance of the catalyst, widens the low temperature reaction window, and prolongs the service life of the catalyst.

The invention relates to a preparation method and an application of a catalyst, wherein a gamma-type aluminium oxide serves as a carrier to load a metallic oxide catalyst. The catalysts related in the invention are prepared thorough a dipping method. The catalyst has the advantages that the gamma-type aluminium oxide catalyst has the advantages of adjustable pore structure, larger specific surface area, better absorbability, higher mechanical strength, acidity of the surface, good thermal stability and the like. The catalyst is used to remove the NO and the SO2 in the smoke at the same time, specifically the NO and the SO2 in the FCC (fluid catalytic cracking) smoke. According to the invention, the CO is used as a reducing agent to conduct catalytic reduction on the NO and the SO2 in the smoke.

The invention provides a method for preparing a cerium oxide-based precious metal nanometer catalyst, the catalyst prepared by the method and application of the catalyst. The catalyst can still maintain the high dispersion of precious metals after the catalyst is calcinated at 750 DEG C or 850 DEG C, and the catalyst has higher activity and better stability in the methane activation conversion reaction. A preparation process is simple, and the structure of the catalytic material is stable at a high temperature. The catalyst has potential application value in the methane activation and conversion such as the high temperature gas phase reactions of methane dry reforming and methane steam reforming.

The invention provides a high-specific-surface-area Fischer-Tropsch synthesis catalyst and a preparation method and application of the high-specific-surface-area Fischer-Tropsch synthesis catalyst. Organisms with different types and contents are added into different stages of catalyst preparation by a traditional coprecipitation method, for example, micromolecule organisms are added in the precipitation process so as to inhibit the aggregation of particles in the precipitation process, so that the dispersion degree of the whole system is improved; macromolecule organisms are introduced into a filter cake so as to inhibit the clustering of particles in the thermal treatment process, and can play a role of pore forming when being removed in a baking process; meanwhile, with the combination of the use of a high-thermal-stability additive, the contraction and collapse of a framework of the catalyst in the thermal treatment process can be prevented effectively; the method can be used for obviously improving the specific surface area of the Fischer-Tropsch synthesis ferrous catalyst, so that the activity of the catalyst can be improved greatly.

Oxides CeO2, ZrO2, La2O3 and Pr6O11 or their salts are prepared into mixed ionic nitric acid solution; small amount of surfactant and carbon nanotube are added into precipitant solution to prepare mixed precipitant solution; two kinds of solution are made to react to produce precipitate; and the precipitate is incinerated at 400-700 deg.c to obtain quarternary nanometer-level cerium-based carbon nanotube-containing composite RE oxide. The composite oxide has high specific surface area at both low temperature and high temperature and high heat stability. It may be used in various catalytic reaction process, such as hydrosulfurization, hydrodenitrification, dehydrohalogenation, internal combustion engine waste gas treatment and dehydrocyclization of hydrocarbon and other organic matters, and is especially suitable for use in purifying automobile tail gas.

The present invention discloses a preparation method of a cobalt-based catalyst having a core-shell structure. The preparation method comprises: 1) selecting an industrially molded composite oxide as a carrier; 2) dissolving a soluble cobalt salt and a metal auxiliary agent salt in an alcohol and water mixing solvent to prepare an impregnating solution; 3) at the high speed flipping state of the composite oxide carrier, rapidly and uniformly mixing the impregnating solution and the composite oxide carrier to prepare a solid catalyst precursor; and 4) drying, and calcining to obtain the cobalt-based catalyst having the core-shell structure. The present invention further discloses the cobalt-based catalyst having the core-shell structure and prepared through the method. According to the present invention, the industrially molded composite oxide is selected as the carrier, and the cobalt salt and the metal auxiliary agent salt adopted as the active components are uniformly impregnated on the outer surface of the carrier by using the rapid rolling of the carrier, such that the defect that the traditional impregnating method cannot accurately control the active species distribution appearance is broken through, the efficient utilization of the cobalt metal is achieved, the catalyst preparation cost is reduced, and the activity and the operation stability of the catalyst are improved.

The invention provides a cerium oxide-coated precious metal nano-catalyst and its preparation method. The method comprises the following steps: mixing a halogen-containing compound and water, adding cerous salt, stirring, and adding a precious metal precursor to obtain a mixed solution; and heating the mixed solution to 30-90 DEG C, adding ammonia water, carrying out thermal insulation at 30-90 DEG C for 0.5-4 h, cooling to room temperature, carrying out centrifugal separation, and washing to obtain the cerium oxide-coated precious metal nano-catalyst. The invention also provides a cerium oxide-coated precious metal nano-catalyst prepared by the above method. During the reaction process of the preparation method, no organic component is added, and no surface modification is required. Thus, costs are reduced, steps are simplified, and nontoxic and low-energy mass production is realized. The core-shell structure of the above catalyst has excellent sintering resistance. The catalyst has high catalytic activity and has high thermal stability.