405 results about "Cordierite" patented technology

The invention relates to the technical field of ceramic clay, in particular to wear-resistant ceramic clay and a preparation method thereof.The wear-resistant ceramic clay is prepared from, by weight, 35-40 parts of kieselguhr, 15-20 parts of silicon carbide, 8-12 parts of modifier based on mullite modification, 5-8 parts of modified cordierite agent, 4-7 parts of aluminum oxide, 4-7 parts of calcined talc, 3-5 parts of potassium feldspar and 30-35 parts of water. According to the wear-resistant ceramic clay disclosed by the invention, the diatomite and the silicon carbide are matched with the aluminum oxide, the calcined talc and the potassium feldspar, and the modifier based on mullite modification and the modified cordierite agent are added, so that the wear resistance, the stain resistance and the heat-conducting property of the obtained ceramic clay are coordinated and improved through co-blending and matching of the raw materials and mutual enhancement and improvement of the raw materials; meanwhile, the product is remarkable in anti-damage stability effect.

The invention provides an anti-corrosion ceramic sagger and a preparation method thereof.The anti-corrosion ceramic sagger comprises an aggregate layer and a matrix layer, and the aggregate layer is prepared from, by mass, 30-50 parts of yttrium-stabilized zirconia, 20-30 parts of silicon carbide and 15-25 parts of magnesium aluminate spinel; the matrix layer is prepared from the following raw materials in parts by mass: 40 to 50 parts of mullite micro powder, 30 to 40 parts of cordierite micro powder and 10 to 20 parts of binding agent. According to the anti-corrosion ceramic sagger and the preparation method thereof, by optimizing the raw material ratio and the preparation process, the corrosion depth is smaller than or equal to 0.19 mm after the sagger is soaked in the molten salt environment at 900 DEG C for 72 h, the service life is prolonged by 6-8 times compared with that of a traditional corundum sagger, and the anti-corrosion ceramic sagger has wide application prospects.

The invention relates to the technical field of honeycomb ceramic materials, in particular to a cordierite honeycomb ceramic material with low heat capacity and high specific surface area and a preparation method thereof. The pug comprises an inorganic solid component, an organic component and water, the inorganic solid component comprises narrow-particle-size-distribution spherical magnesium hydroxide, spherical aluminum hydroxide and spherical fused silicon dioxide; the particle size D50 of the narrow-particle-size-distribution spherical magnesium hydroxide powder is 0.1-2 microns, and the particle size D97 is smaller than or equal to 20 microns; the particle size D50 of the spherical aluminum hydroxide powder is 1-6 [mu] m, and the particle size D97 is less than or equal to 20 [mu] m; the particle size D50 of the spherical fused silica powder is 6-12 [mu] m, the particle size D97 is less than or equal to 20 [mu] m, and the sphericity is greater than or equal to 98%. The method is low in extrusion pressure, the obtained material is high in pore density, meanwhile, high porosity can be achieved without adding a pore-forming agent, and the ultra-thin wall is achieved; the composite material can be applied to various requirements of low heat capacity and high specific surface area.

A high-strength, highly transparent nanocrystalline glass, a preparation method therefor, and a use thereof. The high-strength, highly transparent nanocrystalline glass uses precursor minerals mainly comprising synthetic aluminum-rich feldspar-like ceramic glass material, β-spodumene material, cordierite material, synthetic β-dicalcium silicate material, and magnesium aluminum spinel material for the main body of a feldspar-like matrix glass having a stable structure. Ultrafine zirconia powder having a particle size of less than 10 nm is used as a nucleating agent and microcrack damping and pinning agent, to control the formation of nanocrystals smaller than 100 nm in the glass body formed after melting. The volume percentage content of the nanocrystals is 50%-95%, and the nanocrystals together with the matrix glass form a high-strength, highly transparent nanocrystalline glass having a uniform microstructure. The obtained nanocrystalline glass has high hardness, high fracture toughness and high light transmittance, and is suitable for manufacturing various types of optical glass.

According to the low-expansion ceramic fiber board and the preparation method thereof, high-purity aluminum silicate fibers and refined cordierite powder are compounded, and the nanoscale permeation effect of ammonia type silica sol is combined, so that the fibers and the powder form a three-dimensional network bonding structure, and the thermal expansion coefficient is reduced; the wettability of the combination of the fibers and the powder is remarkably improved by a pre-dispersion process of the cationic starch, and the block mass rate is reduced; the vacuum-assisted compression molding and the gradient calcining process are synergistic, so that the density uniformity of the product is improved, and high-temperature cracking is avoided.

The invention discloses a cordierite material prepared from magnesium waste porcelain and a preparation method of the cordierite material, the cordierite material is prepared from the following raw materials: magnesium waste porcelain, talc, a clay raw material and a high-aluminum raw material, and the weight percentage of the magnesium waste porcelain is 20-40%. According to the invention, the magnesium ceramic waste is fully utilized as a cordierite synthesis precursor to prepare the high-performance heat-resistant ceramic, so that the efficient reutilization of resources is realized, the dependence on scarce resources is greatly reduced, and the cost of raw materials is effectively reduced. Meanwhile, due to the low sintering temperature, energy consumption is remarkably reduced, carbon emission is greatly reduced, and the current green and environment-friendly development concept is perfectly met. Through a unique formula and process design, the ceramic body with excellent thermal shock resistance is successfully prepared at a relatively low firing temperature. According to the technical innovation, the performance of the ceramic is remarkably improved, and a brand new thought and a brand new method are brought to the field of manufacturing of the heat-resistant ceramic.

The invention relates to the technical field of ceramic materials, in particular to a ceramic material and a preparation method and application thereof. The invention provides a ceramic material, which is prepared from the following raw materials in percentage by mass: 5 to 30 percent of ball clay, 5 to 25 percent of purple grit mud, 10 to 35 percent of mullite, 15 to 40 percent of cordierite and 3 to 10 percent of pore forming agent. The ceramic material has the characteristics of good heat storage property, impact resistance and light weight. The pizza stone plate can be comparable with a high-grade pizza stone plate made of natural volcanic materials.

The invention belongs to the technical field of denitration catalysts, and discloses a CO-SCR denitration catalyst and a preparation method and application thereof. The preparation method comprises the following steps: (1) putting honeycomb cordierite into a muffle furnace for preliminary calcination to obtain a carrier; (2) immersing the carrier into a mixed solution containing an aluminum source and an alkaline nitrogen source for hydro-thermal treatment, taking out the carrier after hydro-thermal treatment, and washing and drying to obtain a surface modified carrier; (3) preparing a bottom layer coating solution containing catalyst powder and a first pore-forming agent; preparing a surface layer coating solution containing catalyst powder and a second pore forming agent; wherein the average particle size of the first pore-forming agent is larger than that of the second pore-forming agent; (4) immersing the surface modified carrier into the bottom layer coating liquid for coating, carrying out primary drying, then immersing the surface modified carrier into the surface layer coating liquid for coating, and carrying out drying treatment to obtain a catalyst precursor; and (5) calcining the catalyst precursor to obtain the CO-SCR denitration catalyst.

The invention relates to the field of fire-resistant and heat-insulating bricks, and discloses a multifunctional fire-resistant and heat-insulating brick and a manufacturing process thereof. Comprising the following raw materials in parts by weight: 10-15 parts of silicon carbide, 10-20 parts of mullite, 5-10 parts of cordierite, 30-40 parts of aluminum oxide, 5-10 parts of zirconium oxide, 2-4 parts of titanium dioxide nanoparticles, 6-9 parts of a cleaning agent, 3-5 parts of yttrium oxide and 1-12 parts of a micropore forming agent. By adding manganese oxide and cerium oxide, when the surface of the brick body is in contact with reducing substances or impurities, the oxidation reaction of the reducing substances or impurities can be promoted, and the impurities are converted into oxides which are easy to remove, so that the high-temperature oxidation self-cleaning function is realized, and the capability of keeping the brick body clean and stable in performance in a complex high-temperature environment is enhanced; brick body corrosion and performance degradation caused by impurity deposition are reduced, and therefore the problem that in a high-temperature industrial environment, dirt and impurities are prone to being attached to the surface of a traditional fire-resistant heat-insulating brick, and the heat-insulating performance of the traditional fire-resistant heat-insulating brick is affected is solved.

The invention discloses a preparation method of high-performance cordierite DPF honeycomb ceramic, and belongs to the technical field of honeycomb ceramic carrier preparation. The preparation method comprises the following steps: mixing raw materials; kneading mud; performing extrusion molding; drying and shaping; cutting and firing to obtain a cordierite honeycomb ceramic carrier; and performing boundary dimension processing, film covering, hole dotting, mud scraping and drying to obtain a finished product. According to the invention, aluminum hydroxide is adopted to replace or partially replace aluminum oxide in the formula of the cordierite porous ceramic structure while magnesium hydroxide is used, and the two substances can form a synergistic heat absorption mechanism by virtue of the difference of the aluminum hydroxide and magnesium hydroxide in thermal decomposition temperature, so that the heat absorption efficiency of the cordierite porous ceramic structure is greatly improved in the low-temperature coke discharge stage of a carrier mud blank. Aluminum hydroxide is subjected to a decomposition reaction before magnesium hydroxide, and then magnesium hydroxide is continuously decomposed at a higher temperature, so that the temperature range covered by the whole heat absorption process is greatly widened, the heating rate of the carrier mud blank is effectively slowed down, and thermal shock caused by sudden rising of local temperature is avoided.

The invention provides a sintered brick containing iron ore tailing mud and a preparation method of the sintered brick. The sintered brick comprises the following components in parts by weight: 50-70 parts of iron ore tailing mud, 10-15 parts of concrete mixing plant sludge, 10-15 parts of coal gangue, 6-10 parts of fly ash, 10-15 parts of akermanite, 5-7 parts of magnesium cordierite and 2-4 parts of an auxiliary agent. The preparation method comprises the following steps: (1) uniformly stirring akermanite and magnesium cordierite, and carrying out hot-pressing treatment to obtain a first hot-pressed mixture; (2) pre-sintering the iron ore tailing mud and the concrete mixing plant sludge to obtain a pre-sintered material; (3) uniformly stirring coal gangue, fly ash, the first hot-pressed mixture and the pre-sintered material, adding water until the water content is 40-50wt%, and aging to obtain a mixture; (4) adding an auxiliary agent into the mixture, uniformly stirring, aging, and carrying out compression molding to obtain a green brick; and (5) drying and firing the green brick to obtain the sintered brick. The prepared sintered brick is high in yield, harmless and resource utilization of the iron ore tailing mud is achieved, and the obtained sintered brick is light in dead weight, high in compressive strength and good in weather resistance.

The invention discloses a preparation method of a gasoline car honeycomb ceramic carrier with an ultralow thermal expansion coefficient, and belongs to the technical field of honeycomb ceramic materials. The method comprises the following steps: selecting raw materials; performing pretreatment; mixing the materials; kneading mud; performing extrusion molding; and cutting and firing to obtain the cordierite honeycomb ceramic carrier. A magnesium source in talc and a part of an aluminum source in alpha-aluminum oxide are replaced by the monohydrate boehmite and the magnesium oxide which are higher in reaction activity, the sol is formed through a complexation reaction with citric acid, then the sol is mixed with silicon dioxide and aluminum oxide particles, the reaction activity of a solid-phase reaction is improved at the same firing temperature, and the solid-phase reaction time is shortened. The thermal expansion coefficient of the cordierite honeycomb ceramic carrier is effectively reduced, and the thermal shock resistance requirement of gasoline cars in the national sixth emission standard can be met.

The invention discloses low-expansion cordierite ceramic prepared from chlorite and a preparation method of the low-expansion cordierite ceramic. The low-expansion cordierite ceramic is prepared from the following chemical components in percentage by mass: 47.3 to 48.8 percent of SiO2, 37.6 to 39.1 percent of Al2O3, 0.5 to 0.6 percent of CaO, 12.35 to 13.4 percent of MgO, 0.05 to 0.1 percent of Fe2O3, 0.01 to 0.02 percent of K2O, 0.003 to 0.009 percent of Na2O and 0.16 to 0.21 percent of TiO2. The preparation method comprises the following steps: 1, taking chlorite as a raw material, and adding kaolin and aluminum oxide to prepare a cordierite precursor; step 2, adding fused quartz into the cordierite precursor prepared in the step 1 to prepare mixed powder; and 3, molding the mixed powder obtained in the step 2, and firing to obtain the low-expansion cordierite ceramic.

The invention discloses a metal composite oxide cordierite monolithic catalyst for removing short-chain hydrocarbons as well as a preparation method and application of the metal composite oxide cordierite monolithic catalyst. The method comprises the following steps: putting an active metal source precursor into deionized water, performing ultrasonic dispersion, and stirring until the active metal source precursor is completely dissolved to form a stable precursor solution; dropwise adding an ammonia water solution into the precursor solution in the stirring process until precipitate appears; and washing with deionized water, drying and calcining to obtain the transition metal composite oxide. The preparation method comprises the following steps: adding a transition metal composite oxide and a binder into deionized water, stirring, and grinding into slurry; adding noble metal into the slurry, and uniformly stirring to obtain coating slurry; the honeycomb ceramic cordierite carrier is subjected to soaking pretreatment in acid, drying and calcining. And soaking the honeycomb ceramic cordierite carrier in the coating slurry, taking out the honeycomb ceramic cordierite carrier, purging, drying, and calcining to obtain the catalyst. The catalyst prepared by the method shows excellent multi-component short-chain hydrocarbon catalytic oxidation activity and stability.

The invention discloses a preparation method of ultra-smooth low-expansion ceramic glaze for in-situ generation of cordierite, bismuth oxide and antimony oxide are introduced into a high-potassium low-sodium system to form a K-Mg-Sb-Bi multi-element eutectic system, so that the low thermal expansion property and the smooth property of the glaze are realized; in-situ precipitation of cordierite microcrystals in a glaze glass phase is more successfully guided, so that a ceramic glaze surface with excellent comprehensive performance is obtained.

The invention discloses ceramic slurry for a lithium ion battery, a ceramic diaphragm and the lithium ion battery. The ceramic slurry comprises the following components in parts by mass: 12-58.8 parts of cordierite ceramic powder, 0.1-10 parts of an adhesive, 0.1-5 parts of a dispersing agent, 0.01-2 parts of a thickening agent and 40-80 parts of water. The ceramic diaphragm comprises ceramic slurry. According to the invention, cordierite ceramic powder is used as a main raw material and has a layered crystal structure and a hexagonal crystal structure, the crystal of the cordierite ceramic powder contains tetrahedral and octahedral units of magnesium, aluminum and silicon, a complex three-dimensional network is formed, ions, especially lithium ions and sodium ions, can freely move in crystal lattices of the cordierite ceramic powder, the migration energy barrier is low, and the performance of the cordierite ceramic powder is improved. The cordierite ceramic powder disclosed by the invention has relatively high ionic conductivity and lower relative density, and the energy density of a high-rate battery is obviously improved when the cordierite ceramic powder is used for the high-rate battery.

The invention discloses a high-activity formaldehyde production tail gas purification monolithic catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalysts. The invention discloses a high-activity formaldehyde production tail gas purification monolithic catalyst. The catalyst is loaded by taking cordierite honeycomb ceramic as a matrix; the catalyst comprises an active component, an auxiliary agent and a nitrogen-doped carrier for loading the active component and the auxiliary agent, the active component is Pt or / and Pd, the auxiliary agent comprises In2O3, and the nitrogen-doped carrier comprises an oxygen storage material and Al2O3. The invention further discloses a preparation method of the high-activity monolithic catalyst for purifying the formaldehyde production tail gas and application of the high-activity monolithic catalyst in purification of methanol-to-formaldehyde tail gas. The carrier is doped with the nitrogen element, and the indium element is introduced, so that the binding capacity between the noble metal and the carrier is enhanced, the noble metal is in an oxidation state to stabilize the noble metal element, the electronic property of the material is adjusted and improved, and the catalytic activity of the material is improved.

The invention belongs to the technical field of ceramics, and particularly relates to a light glazed ceramic large brick and a preparation method thereof. The light glazed ceramic large brick is composed of a blank body layer, a ground coat layer and a surface glazed layer, wherein the blank body layer is prepared from the following components in parts by weight: 35-42 parts of kaolin, 25-30 parts of argil, 8-12 parts of cordierite, 10-15 parts of quartz, 5-9 parts of aluminum oxide, 4-9 parts of potassium feldspar and 1-3 parts of a binder; the ground glaze layer is prepared from the following components in parts by weight: 25-37 parts of potassium feldspar, 15-20 parts of calcined talc, 15-20 parts of frit, 10-25 parts of quartz, 8-10 parts of calcite, 5-10 parts of zirconium silicate and 5-8 parts of calcined zinc oxide; and the surface polishing glaze is prepared from the following components in parts by weight: 30-40 parts of frit, 20-30 parts of clay, 15-22 parts of albite, 10-15 parts of zinc oxide, 10-15 parts of stone powder and 8-13 parts of kaolin. Meanwhile, according to the preparation method of the large ceramic brick, a low-temperature fast firing technology is adopted, the sintering performance of the large ceramic brick is improved, the strength and hardness of the large ceramic brick are improved, and the large ceramic brick is safe, firm and not prone to breakage when bearing certain pressure or impact force.

The invention relates to high-strength and high-transparency nano glass ceramic and a preparation method and application thereof, and the high-strength and high-transparency nano glass ceramic is prepared from a synthetic aluminum-rich feldspar ceramic glass material, a beta-spodumene material, a cordierite material, a synthetic beta-dicalcium silicate material and a magnesium aluminate spinel material. According to the present invention, a stable-structure feldspar matrix glass is adopted as a main body precursor mineral material, zirconia micro-powder with a particle size of less than 10 nm is adopted as a nucleation agent and a micro-crack damping pinning agent, nanometer microcrystals with a particle size of less than 100 nm are controlled to be generated in a glass body formed after melting, and the nanometer microcrystals account for 50-95% by volume; the high-strength and high-transparency nanocrystalline glass with a uniform microstructure is formed and woven with matrix glass in a symbiotic manner. The prepared nano microcrystalline glass has the advantages of high hardness, high fracture toughness resistance and high light transmittance, and is suitable for manufacturing various optical glass.

A pillar-shaped honeycomb structure, comprising an outer peripheral side wall; first cells having an opening on the first end surface and having a sealing portion on the second end surface; and second cells adjacent to the first cells with partition walls interposed therebetween and having a sealing portion on the first end surface and having an opening on the second end surface; wherein the outer peripheral side wall, the partition walls, and the sealing portions are fired, and comprise cordierite as a main component and one or more sintering aids selected from ceria, zirconia, and titania; wherein in the partition walls, assuming an average porosity of a portion in a range A, and a portion in a range B is P1 (%); and assuming an average porosity of a portion in a range C is P2 (%), −4≤P1−P2≤7 is satisfied.

The invention provides a low-Rh high-efficiency three-way catalyst and a preparation method thereof. A cordierite honeycomb ceramic carrier is used as a carrier; the upper half area of the gas inlet end of the carrier is provided with a rhodium-containing coating, and the lower half area of the gas inlet end of the carrier is provided with a palladium-containing coating; a platinum-containing coating is arranged at the gas outlet end of the carrier; the rhodium-containing coating comprises rhodium, a cerium oxide nanowire and a cerium-zirconium-aluminum oxide; the palladium-containing coating comprises palladium, lanthanum modified aluminum oxide and cerium zirconium oxide; the platinum-containing coating comprises platinum and lanthanum modified gamma-aluminum oxide. Precious metals rhodium, palladium and platinum are coated on a cordierite honeycomb ceramic carrier in a partitioned manner, and then noble metal active components are loaded on a specific type of carrier, so that the thermal stability of Pt is enhanced, the catalytic activity of Pt and Rh on NOx is improved, and the catalytic activity of Pt and Pd on CO and CH4 is improved; the catalyst is low in Rh content, has a good conversion effect on CO, CH4 and NOx, and is low in CH4 ignition temperature and good in durability.

The invention relates to a catalyst for treating nitrogen-containing VOCs and application thereof in treatment of nitrogen-containing VOCs, the main preparation steps are as follows: a carrier component containing Si, Al and optional Mg, a cross-linking agent, a rare earth oxide and water are put in a ball mill for ball milling to prepare coating slurry, the coating slurry is coated in cordierite honeycomb ceramic channels by a vacuum coating method, and the catalyst is prepared. And then the coated honeycomb ceramic is quickly dried. Preparing a metal nitrate solution as an impregnation liquid, impregnating the nitrate on the dried honeycomb ceramic, aging, quickly drying the impregnated honeycomb ceramic, and roasting the dried honeycomb ceramic for a certain time to obtain the catalyst. According to the preparation method disclosed by the invention, the catalyst for treating the nitrogenous VOCs, which is formed in a honeycomb manner, low in preparation cost, relatively high in N2 selectivity, good in catalytic oxidation effect and high in stability, can be produced, so that the problems of long technological process, short service life of the catalyst, secondary pollution of NOx and the like in the conventional process for treating the nitrogenous VOCs are solved.

The invention relates to the technical field of batteries, in particular to a positive pole piece, a preparation method thereof and a battery. The positive pole piece comprises a current collector; the first positive electrode active material layer is arranged on the surface of at least one side of the current collector along the thickness direction, and the first positive electrode active material layer comprises a first positive electrode active material; the second positive electrode active material layer is arranged on the surface, far away from the current collector, of the first positive electrode active material layer, and the second positive electrode active material layer comprises a second positive electrode active material; the safety layer is arranged on the surface, far away from the first positive electrode active material layer, of the second positive electrode active material layer, and the safety layer comprises cordierite. According to the positive pole piece, the safety, the structural stability and the electrochemical performance of the battery can be improved.

The invention discloses a method for improving the firing yield of cordierite DPF honeycomb ceramics, and belongs to the technical field of honeycomb ceramic carrier preparation. The preparation method comprises the following steps: mixing raw materials; kneading mud; performing extrusion molding; drying and shaping; cutting and firing to obtain a cordierite honeycomb ceramic carrier; and performing boundary dimension processing, film covering, hole dotting, mud scraping and drying to obtain a finished product. According to the invention, magnesium hydroxide is used for replacing part or all of talc in a traditional formula of a cordierite porous ceramic structural body, and magnesium hydroxide absorbs a large amount of heat when heated, so that rapid temperature rise of a DPF carrier mud blank caused in an organic matter coke discharge process is slowed down, the temperature gradient of the DPF carrier mud blank in a firing process is reduced, and the sintering temperature of the DPF carrier mud blank is reduced. Therefore, the generation of mud blank cracks is inhibited in the firing process, and the firing yield is improved.

The present invention discloses a ZTA composite ceramic with a high zero stress temperature point and a preparation method thereof, and belongs to the technical field of ceramic-based composite material preparation. The present invention adopts a mixed powder of kyanite and cordierite in a specific ratio as a coating, and a ZTA ceramic as a matrix, and a coating of a certain thickness is coated on the ZTA embryo by a "coating method", and after co-firing at the same temperature, a ZTA composite ceramic with a higher zero stress temperature point is obtained. The ZTA composite ceramic prepared by the present invention has the advantages of excellent mechanical properties at room temperature, good high temperature performance, and a wider high temperature working range. The preparation method of the present invention is simple, low-cost, and has obvious reinforcement effect. It has good high-temperature service performance and is suitable for industrial production.

The invention discloses a whisker-reinforced composite porous ceramic material as well as a preparation method and application thereof, which are based on a new process of combining silicon carbide and cordierite and are combined with factors such as silicon carbide particle size and sintering conditions to really realize effective combination of low thermal expansion characteristic of cordierite and high strength characteristic of silicon carbide. The invention aims to synchronously improve the thermal shock resistance and mechanical bearing capacity of a product so as to provide a DPF filter body material with better performance. Furthermore, in order to optimize the filtering performance, mullite whiskers grow in the composite matrix in situ, and a more efficient particulate matter trapping network is constructed, so that the mechanical reliability, the thermal stability and the filtering efficiency are synergistically improved.

To provide a ceramic body having a high porosity, a relatively large median pore diameter, a narrow pore size distribution, and a relatively low CTE, and a method for producing the ceramic body.SOLUTION: In a ceramic body, %P≥50% (where %P is an average bulk volume porosity) and df≤0.36 (where df is (d50-d10) / d50). The ceramic body contains a crystalline phase containing a total weight percentage of at least 85 wt.% of cordierite and indialite, and contains a crystalline phase containing up to 10 wt.% of a pseudobrookite structure. The ceramic body comprises, when expressed as a weight percentage based on oxides: 1 wt.% to 11 wt.% of titania, and 89 wt.% to 99 wt.% of MgO, Al2O3, and SiO2.SELECTED DRAWING: Figure 3

Provided are spherical composite oxide particles having high crystallinity, white color, and low coefficient of thermal expansion. The composite oxide particles according to the present invention are polycrystalline, the main crystal phase contains cordierite and / or hexagonal cordierite, and the coefficient of thermal expansion of the composite oxide particles according to the TMA method is 1.5 ppm or less.

The invention relates to the field of catalysts. The invention relates to a catalyst for catalytic oxidation of carbon monoxide in industrial sulfur-containing flue gas. A carrier is a cordierite honeycomb ceramic carrier coated with activated aluminum oxide (Al2O3), silicon oxide (SiO2) or titanium oxide (TiO2), or a honeycomb carrier with titanium oxide as a skeleton; the noble metal active component is selected from one or a combination of more of palladium (Pd), platinum (Pt) and rhodium (Rh), the total loading capacity accounts for 0.05-0.4 wt% of the mass of the carrier, and the noble metal component is loaded on the surface layer of the carrier at the depth of 10-300 microns and is of an eggshell type distribution structure; the cocatalyst component is selected from one or a combination of more of vanadium oxide (VO), tungsten oxide (WO), cerium oxide (CeO), molybdenum oxide (MoO) and lanthanum oxide (La2O3) and is uniformly distributed on the carrier. Unification of activity, stability and economical efficiency of the catalyst is achieved, the problems that a catalytic oxidation catalyst is prone to inactivation, low in activity and high in cost in complex sulfur-containing flue gas are solved, and the industrial application value is remarkable.

The invention discloses a flame-retardant polyolefin elastomer material, which is prepared from the following raw materials in parts by weight: 20 to 30 parts of polyolefin elastomers, 8 to 12 parts of modified cordierite agents, 6 to 12 parts of flame retardants, 7 to 11 parts of linear low-density polyethylene, 2 to 6 parts of silane coupling agents KH560, 2 to 5 parts of antioxidants and 3 to 5 parts of modified clay. According to the flame-retardant polyolefin elastomer material, the polyolefin elastomer is matched with the linear low-density polyethylene, the silane coupling agent KH560, the antioxidant, the flame retardant and other raw materials, meanwhile, the modified cordierite agent and the modified clay are added for mutual blending and synergistic effect, and through improvement of the raw materials, the obtained polyolefin elastomer material is coordinately improved in flame retardance and mechanical property, and the flame-retardant performance of the polyolefin elastomer material is greatly improved. And the weather-resistant stability effect of the product is remarkable.