1909 results about "Cordierite" patented technology

A catalyst for the selective oxidation of hydrogen has been developed. It comprises an inert core such as cordierite and an outer layer comprising a lithium aluminate support. The support has dispersed thereon a platinum group metal and a promoter metal, e.g. platinum and tin respectively. This catalyst is particularly effective in the selective oxidation of hydrogen in a dehydrogenation process.

An integral de-nitrating catalyst SCR with dual oxides as carrier for removing NOx from fume is characterized by that the cellular cordierite ceramic is used as skeleton, its composite carrier is composed of Al2O3 as internal layer and TiO2 as external layer, and its active component consists of V2O5 and WO3. Its advantages are high activity, wide active temp window, and high effect and mechanical stability.

A cordierite ceramic body having (i) a pore size distribution and a porosity which satisfy the relationship 10.2474/[(d50)<2>(pore fraction)]+0.0366183(d90)-0.00040119(d90)<2>+0.468815(1/pore fraction)<2>+0.0297715(d50)+1.61 639(d50-d10)/d50<=3.65, and (ii) a CTE (25°-800° C.) of <=15X10<-7>/° C., wherein the cordierite ceramic body is produced from a moldable mixture comprising cordierite-forming raw materials including (a) a fine talc having a median particle diameter, as measured by laser diffraction, of less than 10 micrometers, and a B.E.T. specific surface area of greater than 5 m<2>/g, and (b) a pore former. The cordierite ceramic body is suitable in the fabrication of cellular, wall-flow diesel particulate filters having a low pressure drop, high filtration efficiency and improved strength.

A ceramic comprising predominately a cordierite-type phase approximating the stoichiometry Mg₂Al₄Si₅O₁₈ and having a coefficient of thermal expansion (25-800° C.) of greater than 4×10⁻⁷/° C. and less than 13×10⁻⁷/° C. and a permeability and a pore size distribution which satisfy the relation 2.108 (permeability)+18.511 (total pore volume)+0.1863 (percentage of total pore volume comprised of pores between 4 and 40 micrometers)>24.6. The ceramic is suitable in the fabrication of cellular, wall-flow, diesel particulate filters having a pressure drop in kPa that at an artificial carbon soot loading of 5 grams/liter and a flow rate of 26 scfm is less than 8.9-0.035 (number of cells per square inch)+300 (cell wall thickness in inches), a bulk filter density of at least 0.60 g/cm³ and a volumetric heat capacity of at least 0.67 J cm⁻³ K⁻¹ as measured at 500° C.

A catalyst for an integrated supported carbon modular sieve comprises an integrated beehive cordierite, a carbon-nano tube and an HZSM-5 modular sieve, wherein the carbon-nano tube takes 7-20 proportions, HZSM-5 takes 10-30 proportions, and cordierite tales 60-80 proportions. The preparation method is that: carbon-nano tube is produced in situ on the integrated beehive cordierite by using chemical vapor deposition firstly, and the carbon-nano tube is taken as carrier, then the ZSM-5 modular sieve is developed on the carrier by using a secondary growth method. The catalyst for an integrated supported carbon-modular sieve can be used for the gas-phase synthesis of dimethyl ether DME by the dehydration of methanol.

A catalyst with high activity for cleaning the tail gas of car is prepared through preparing the coated composite alumina layer containing Ce, Zr and one or more of La, Pr, Y, Fe, Mn, Cu and Ba on the cellular cordierite ceramic carrier, and chemically plating Pd.

The invention discloses a honeycomb ceramics perovskite catalytic combustion catalyst; the honeycomb ceramics with a metal oxide coating is used as a carrier; the catalytic activity components disclosed in formula (I) are loaded; wherein, La, Sr, Co, and Mn respectively represent lanthanum, strontium, cobalt, and manganese; x is equal to 0 to 0.7 and y is equal to 0 to 0.7; the honeycomb ceramics with a metal oxide coating is to load a metal oxide coating of gamma-Al2O3, CemZr1-mO2, LaMnAl11O19, BaMnAl11O19 or Sr12Al14O21 on the surface of the honeycomb ceramics of a dichroite material; wherein, m is equal to 0.1 to 0.8; the mass ratio of the honeycomb ceramics, the metal oxide coating and the catalytic activity components is 1.0 : 0.03 to 0.2 : 0.05 to 0.15. The invention also relates to a preparation method for the catalyst and the applications of the catalytic combustion thereof to eliminate the waste gases of volatile organic compound; the dichroite honeycomb ceramics carrier and the catalytic activity components of the prepared honeycomb ceramics perovskite catalytic combustion catalyst are combined by one metal oxide coating with high adhesiveness and thermal stability, thus leading the catalyst to have the advantages of high mechanical intensity, high activity and good thermal stability. The catalyst provided by the invention is simple in preparation method, is low in the price of the used materials, and has excellent industrial application prospect. La1-xSrxCoyMn1-yO3 (I).

A ceramic filter for trapping and combusting diesel exhaust particulates composed of an end-plugged cordierite honeycomb structure exhibiting a pore size distribution as determined by mercury porosimetry in which the quantity d₅₀/(d₅₀+d₉₀) as related to pore size distribution is less than 0.70, a soot loaded permeability factor S_f, as defined by the equation [d₅₀/(d₅₀+d₉₀)]/[% porosity/100], of less than 1.55, and, a coefficient of thermal expansion (25–800° C.) of no greater than 17×10⁻⁷/° C. The ceramic filter further exhibits a median pore diameter, d₅₀, of at least 4 micrometers and up to 40 micrometers. A method of making the filter is provided.

A catalyst support structure for use as either a NOx catalyst support or as a DPF including (i) a multicellular ceramic body, preferably a monolithic ceramic honeycomb composed e.g., of cordierite or aluminum titanate, and (ii) a hydrophobic coating on at least the exterior surface thereof which results in a ceramic honeycomb exhibiting reduced or low absorption when exposed to both liquid catalytic coating media and aqueous media utilized in the process of applying the catalytic coating. In a preferred embodiment the hydrophobic coating is formed within or on an applied external skin layer provided on the multicellular ceramic body.

The invention discloses a high-efficiency oxidation catalyst which is used for oxidizing formaldehyde into H2O and CO2 below the room temperature and a preparation method thereof, and the invention is characterized in that the high-efficiency oxidation catalyst takes a honeycomb cordierite pottery and porcelain coated with poriferous Co-Ce-Sn composite oxides as a carrier, 0 to 10 percent of Pt as active components, and MoO3, CuOx, MnOx, TiO2 and so on as accessory ingredients, and the high-efficiency oxidation catalyst does not need energy resources such as light, heat and electricity, etc. and chemical agents to be additionally provided, has much higher removing efficiency of formaldehyde than the techniques of photochemical catalysis and plasma under the conditions of heavy blast volume and high humidity level, etc., does not have any byproduct, and is applicable to the highly-efficient removing of formaldehyde pollution of enclosed or semi-enclosed spaces such as production departments of man-made boards, living rooms and building material and furniture markets, etc.

An ultracapacitor or hybrid capacitor includes an electrically non-conductive rigid or semi-rigid porous honeycomb structure (12) having cells extending along a common direction and having an average density per unit area within in a plane perpendicular to the common direction exceeding 15.5 per square centimeter, desirably formed of a material that is stable at temperatures of 300° or more, such that high temperatures processing can be used to help ensure high purity of the final product. The material may desirably be an oxide or non-oxide ceramic, such as cordierite, silicon nitride, alumina, aluminum titanate, zircon, glass, or glass-ceramic.

The present invention relates to dry refractory compositions having excellent thermal insulation values. The dry refractory composition also has excellent resistance to molten metal and slag. The composition comprises a lightweight filler material selected from the group consisting of perlite, vermiculite, expanded shale, expanded fire clay, expanded silica-alumina hollow spheres, vesicular alumina, sintered porous alumina, alumina spinel Stone insulating aggregate, ettringite insulating aggregate, expanded mullite, cordierite and anorthite, and a matrix material selected from the group consisting of calcined alumina, fused alumina, sintered magnesia, fused magnesia, Silicon fume, fused silica, corundum, boron carbide, titanium diboride, zirconium boride, boron nitride, aluminum nitride, silicon nitride, sialonite, titanium dioxide, barium sulfate, zircon, sillimanite Group of minerals, pyrophyllite, fire clay, carbon and calcium fluoride. The composition may also contain dense refractory aggregates selected from the group consisting of calcined clay, calcined clinker, minerals of the sillimanite group, calcined bauxite, pyrophyllite, silica, zircon, baddeleyite, cordierite , corundum, sintered alumina, fused alumina, fused quartz, sintered mullite, fused mullite, fused zirconia, sintered zirconia mullite, fused zirconia mullite, sintered magnesia, Fused magnesia, sintered spinel and fused spinel refractory clinker. The composition also contains a heat activated binder and a dust suppressant.

Disclosed are ceramic bodies comprised of composite cordierite aluminum magnesium titanate ceramic compositions and methods for the manufacture of the same.

A three-element catalyst for cleaning the tail gas of car features that the cellular cordierite ceramics modified by the RE tailing mixture or transition metal oxide is ued as the first carrier, the internal and external modified alumina coating layers are used as the second carrier, and the noble metal Pt, Rh or Pd is used as its active component.

The invention relates to a porous ceramic membrane support with a flat structure and a preparation method thereof, and belongs to the technical field of ceramic membrane supports. The ceramic membrane support is flat and consists of two flat membrane supports; a certain space is reserved between the two flat membrane supports; at least one supporting column is distributed in the space; and at least one water outlet passage is formed in each flat membrane support, so that flowing resistance of filtrate in the support with the flat structure is reduced. The ceramic aggregate of the support is one or more of alumina, zirconia, silicon dioxide, silicon carbide, titanium oxide, mullite and cordierite; the pore-forming agent is starch, graphite, phenolic resin spheres and the like; and the adhesive is methylcellulose, polyvinyl alcohol and the like. The porosity of the prepared porous ceramic membrane support with the flat structure can reach 30 to 50 percent, the aperture is 20 to 200 nanometers, and the compressive strength can reach 20 to 40MPa; and the support can be used for substituting an organic hollow fiber membrane bioreactor, and has great potential application in the fields of sewage treatment, fine chemical industry and the like.

The present invention relates to a catalyst of a metal oxide compound used for organic exhaust gas purification, and a preparation method for the catalyst. The catalyst uses the cordierite honeycomb ceramic intensively pretreated with the nitric acid as a carrier, and an active aluminum oxide coating modified by a mixed oxide of cerium, lanthanum and zirconium, and an active component comprising a plurality of metallic oxide mixtures are loaded on the carrier in a lump. For the catalyst preparation method, heat treatment is conducted on the carrier with the nitric acid, the concentration of which is 5 to 15 percent; after a specific surface area of the carrier is increased, the coating, which comprises and is loaded with the mixed oxide active component, is immersed in a lump. The catalyst is provided with the large specific surface area. The active component is a transition metal oxide mixture, which comprises no noble metal. Moreover, the catalyst is provided with the excellent performance and the low cost, and can be spread and applied easily. The catalyst is provided with the high catalytic combustion efficiency for the organic exhaust gas comprising benzene, toluene, dimethybenzene, polycyclic aromatic hydrocarbon and so on, and the ignition temperature is low. Thus, the catalyst is widely applicable for purification of the industrial organic exhaust gas. The technique of one-time immersion, drying and calcination is adopted, so the manufacture equipment needed is simple.

The invention is a high temperature ceramic filter element for hot gas purification, which is made up of ceramic supporter and outer ceramic fiber compound film, ceramic supporter and the ceramic fiber compound film are made up of cordierite, high temperature binder, aperture adding agent and ceramic fiber, binder, fire resisting material, it uses mechanical vibration heat pouring craft, the ceramic supporter can be fabricated through high temperature process, then the forming pulp is produced, the ceramic supporter is immersed in the pulp, and forms a ceramic filter compound layer out of the surface of the supporter, and the product can be acquired. The product has a high mechanical density, excellent heat stability, small product volume.

A high-porosity thin-wall cordierite-type cellular ceramics is prepared proportionally from LiO2, talc, kaolinite, calcined kaolinite, alpha-AlO, aluminum hydroxide, silicon powder, solid adhesive, and the liquid organic additive prepared from water, propanetriol, liquid adhesive, surfactant and lubricant. Its preparing process is also disclosed.

The invention discloses a selective catalyst for removing oxynitrides from tail gases of diesel vehicles and a preparation method thereof. Cordierite honeycomb ceramic serves as a carrier, and the oxides of vanadium, zirconium, tungsten and titanium form a catalytic active site. The preparation method comprises the following steps of: sequentially dissolving vanadium pentoxide, a zircon salt, tungsten trioxide and titanium dioxide into the aqueous solution of oxalic acid, adding a bonder into the mixed solution to prepare pulp, impregnating the cordierite honeycomb ceramic in the pulp, drying the cordierite honeycomb ceramic for 1 to 3 hours at 100 to 150 DEG C, and roasting the cordierite honeycomb ceramic for 2 to 4 hours at 450 to 550 DEG C. In the invention, the preparation method is improved, and a powder catalyst is improved into a honeycomb selective catalytic reduction (SCR) catalyst applied to the removal of the oxynitrides from the tail gases of the diesel vehicles, so the high-efficiency catalytic removal of the oxynitrides can be realized at the temperature of 205 to 515 DEG C; and in the presence of steam or SO2, the activity of the catalyst is kept over 80 percent.

The refractory material for coke oven door consists of mullite 42-63 wt%, cordierite 20-30 wt%, micro silica powder 5-10 wt%, micro active alumina powder 4-8 wt%, kyanite 3-7 wt%, high alumina cement 3-5 wt%, and composite polyphosphate 0.2-0.5 wt%. The mullite is M60 mullite containing Al2O3 not less than 60 wt%, the cordierite contains Al2O3 33-35 wt% and MgO 13-15 wt%, the micro silica powder contains SiO2 not less than 92 wt%, the micro active alumina powder contains Al2O3 more than 98 wt%, the high alumina cement contains Al2O3 not less than 46 wt%, CaO not more than 40 wt% and SiO2 not more than 10 wt%. The refractory material may be produced into coke oven door through low temperature roasting without need of backing, and the coke oven door has service life over 4 years.

The honeycomb ceramic catalyst has surface treated honeycomb iolite ceramic as carrier, coated active alumina film and coated active components CuO and Na2O; and is prepared through soaking process. It has a normal pressure fume denitrifying rate as high as 88 %, desulfurizing rate higher than 80 %, SO2 adsorbing amount of 62 mg each gram of the catalyst and small bed resistance; and is suitable for industrial application.

Calcium magnesium aluminosilicate (CMAS) mitigation compositions selected from rare earth elements, rare earth oxides, zirconia, hafnia partially or fully stabilized with alkaline earth or rare earth elements, zirconia partially or fully stabilized with alkaline earth or rare earth elements, magnesium oxide, cordierite, aluminum phosphate, magnesium silicate, and combinations thereof when the CMAS mitigation composition is included as a separate CMAS mitigation layer in an environmental barrier coating for a high temperature substrate component.

The invention discloses a denitration catalyst and a preparation method thereof, the catalyst takes pretreated cordierite honeycomb ceramics as a matrix, a silicon-aluminum coating, a composite coating and an active component are coated on the surface of the matrix, by measuring gross weight of the catalyst, the catalyst contains 80-90wt% of cordierite honeycomb ceramics, 2-9wt% of silicon-aluminium coating, 3-10wt% of composite coating, and 0.01-15wt% of active component, wherein the active component can be Mn and Fe; by measuring gross weight of the silicon-aluminum coating, the silicon-aluminum coating comprises 10-50wt% of silica, and 50-90wt% of alumina; by measuring gross weight of the composite coating, the composite coating contains 40-80wt% of titanium dioxide, 5-35wt% of ZSM-5 molecular sieve, and 10-40wt% of auxiliary agent; wherein the auxiliary agent is selected from one or more of cerium oxide, zirconia or lanthana. The denitration catalyst has the advantages of large coating load capacity, high firmness, good poison-resistance performance and activity, and wide reaction temperature window; and the preparation method is simple and is suitable for industrial application.

Weight percent ratio of a flue gas Cuo/gamma-Al2O3 catalyst based on cordierite is in that: cordierite carrier is 78.7-93.8%, Al2O3 is 5-16% and CuO is 1.2-5.3%. Cordierite honeycomb ceramic with high intensity is adopted as a substrate, which is impregnated with CuO of a certain concentration after coated with the carrier gamma-Al2O3. The invention can reduce coating crack of the gamma-Al2O3 film and increase firmness of the gamma-Al2O3 coating and uploading capacity of the gamma-Al2O3 by using a simple and effective coating method, and has advantages of enhanced denitrification activity, life and stability of the catalyst.

The invention discloses a preparation method of a honeycomb carrier catalyst for molecular sieve denitration. The preparation method comprises the following steps: 1, preparing a Cu/ZSM-5 catalyst which contains 1.5%-2.5% by weight of Cu by adopting an ion exchange method; 2, pretreating and drying a cordierite honeycomb ceramic carrier under the conditions of acid-base and an organic solvent; 3, preparing slurry, wherein the mass ratio of an adhesion agent to Cu/ZSM-5 catalyst to ethanediol to deionized water is (0.2-0.3):1:1.165:1.165 in the slurry; 4, preparing a primary coating honeycomb carrier denitration catalyst; and 5, preparing a secondary coating honeycomb carrier denitration catalyst. The honeycomb carrier catalyst prepared through the method disclosed by the invention is difficultly plugged in a slurry coating process, firm in coating and high in stability; the prepared honeycomb carrier catalyst is high in denitration efficiency, achieves the denitration efficiency more than 90% at a temperature interval of 170-500 DEG C and can be widely applied to the catalytic reduction of nitrogen oxide in a motor vehicle tail gas post-processing system.