256 results about "Cordierites" patented technology

A porous ceramic honeycomb filter manufactured from an oxide-based ceramic material having a pore size distribution with d₁≧7.0 microns. Preferably, the oxide-based material is cordierite or aluminum titanate. Alternatively, the filter contains a cordierite-containing ceramic body with a narrow pore size distribution with d_b≦1.00, wherein d_b=(d₉₀−d₁₀)/d₅₀. Also disclosed is a batch mixture, method and honeycomb green body made from mixture of inorganic source materials selected from the group of magnesia sources, alumina sources, and silica sources, and a pore former having a narrow particle size distribution with d_ps≦0.90, wherein d_ps={(dp₉₀−dp₁₀)/dp₅₀}. The pore former is preferably selected from a group consisting of canna starch, sago palm starch, green mung bean starch, and single-mode potato starch.

A Selective Catalytic Reduction (SCR) catalyst was prepared by slurry coating ZSM-5 zeolite onto a cordierite monolith, then subliming an iron salt onto the zeolite, calcining the monolith, and then dipping the monolith either into an aqueous solution of manganese nitrate and cerium nitrate and then calcining, or by similar treatment with separate solutions of manganese nitrate and cerium nitrate. The supported catalyst containing iron, manganese, and cerium showed 80 percent conversion at 113 degrees Celsius of a feed gas containing nitrogen oxides having 4 parts NO to one part NO₂, about one equivalent ammonia, and excess oxygen; conversion improved to 94 percent at 147 degrees Celsius. N₂O was not detected (detection limit: 0.6 percent N₂O).

Disclosed are ceramic articles, which in one aspect are composed predominately of a cordierite having a composition close to that of Mg₂Al₄Si₅O₁₈. The ceramic articles possess a microstructure characterized by a unique combination of relatively high porosity and relatively narrow pore size distribution, both as measured by mercury porosimetry, that render the ceramic structure useful for ceramic filter applications requiring high thermal durability and high filtration efficiency coupled with low pressure drop along the length of the filter. Such ceramic bodies are particularly well suited for filtration applications, such as diesel exhaust filters or DPFs. Also disclosed are methods for the manufacture of the ceramic articles described herein.

A diesel particulate filter comprising a plugged, wall-flow honeycomb filter body composed of cordierite and having a plurality of parallel end-plugged cell channels traversing the body from a frontal inlet end to an outlet end thereof, wherein the filter exhibits a CTE (25–800° C.) of less than 13×10⁻⁷/° C., a bulk filter density of less than 0.60 g/cm³, a median pore diameter, d₅₀, of less than 25 micrometers, a porosity and pore size distribution that satisfy the relationship P_m≦3.75, wherein P_m is equal to 10.2474{1/[(d₅₀)²(% porosity/100)]}+0.0366183(d₉₀)−0.00040119(d₉₀)²+0.468815(100/% porosity)²+0.0297715(d₅₀)+1.61639(d₅₀−d₁₀)/d₅₀, wherein d₁₀, and d₉₀ are pore diameters at 10% and 90% of the pore size distribution on a volumetric basis, and d₁₀<d₅₀<d₉₀. A method of making the same is also provided.

A metal oxide nanorod array structure according to embodiments disclosed herein includes a monolithic substrate having a surface and multiple channels, an interface layer bonded to the surface of the substrate, and a metal oxide nanorod array coupled to the substrate surface via the interface layer. The metal oxide can include ceria, zinc oxide, tin oxide, alumina, zirconia, cobalt oxide, and gallium oxide. The substrate can include a glass substrate, a plastic substrate, a silicon substrate, a ceramic monolith, and a stainless steel monolith. The ceramic can include cordierite, alumina, tin oxide, and titania. The nanorod array structure can include a perovskite shell, such as a lanthanum-based transition metal oxide, or a metal oxide shell, such as ceria, zinc oxide, tin oxide, alumina, zirconia, cobalt oxide, and gallium oxide, or a coating of metal particles, such as platinum, gold, palladium, rhodium, and ruthenium, over each metal oxide nanorod. Structures can be bonded to the surface of a substrate and resist erosion if exposed to high velocity flow rates.

The invention discloses a high-temperature smoke selective catalytic reduction (SCR) denitration catalyst. The high-temperature smoke SCR denitration catalyst consists of a carrier and an active ingredient loaded on the carrier and is characterized in that: the carrier is a cordierite honey ceramic loaded with a TiO2-SiO2 coating; and the loading capacity of the TiO2-SiO2 coating is 5 to 30 weight percent. The high-temperature smoke SCR denitration catalyst is prepared by loading titanyl sulfate and silica sol serving as raw materials on a cordierite honey ceramic base material by an in-situ precipitation method so as to form the uniform and firm TiO2-SiO2 coating on the surface of the base material, wherein the obtained TiO2-SiO2 coating has high specific surface area and proper acid strength and can effectively promote catalysis.

Geopolymer composite materials having low coefficient of thermal expansion are disclosed. The materials are useful in high temperature applications due to their low coefficient of thermal expansion and high strength. Also disclosed is a boron modified water glass geopolymer composition that is compatible with ceramic particulate material such as cordierite and fused silica. The geopolymer composite may be extruded to form structures such as honeycomb monoliths, flow filters or used as a plugging or skinning cement and may be fired at temperatures at or below 1100° C. Both the structures and the cement have high green and fired strength, a low coefficient of thermal expansion, and good acid durability. The cost of manufacturing objects using the material of the present invention is substantially reduced, in comparison with typically production methods of cordierite based bodies, due to the substantially shortened firing times.

The invention discloses and provides a roasting sagger for a circulating type lithium battery anode material, which is simple in manufacturing process and structure, does not easily react with a lithium battery material, can avoid polluting the lithium battery material, does not pollute the environment and can be recycled, and a preparation method thereof. The preparation method of the roasting sagger for the circulating type lithium battery anode material comprises the following steps of: (1) uniformly mixing mullite, cordierite, aluminum oxide, corundum, kaolin, active magnesium oxide, spodumene and a bonding agent; adding the materials into a metal mould according to the weight; and pressing and molding a blank by pressing and molding equipment; (2) uniformly mixing zirconium oxide, the spodumene, cerium oxide, the corundum and the bonding agent; uniformly distributing the materials on the surface of the blank by a material distribution machine or manpower and pressing again by the pressing and molding equipment to obtain a semi-finished sagger product; and (3) drying the sagger semi-finished product and sintering. The roasting sagger disclosed by the invention can be widely applied to the field of the sagger for the lithium battery anode material.

A coating material of the present invention is a coating material comprising: cordierite powder as a main component having a tap bulk density of 1.3 g/cm³ or more; and water. The coating material is capable of forming a coated wall (outer wall), for example, on the surface of a porous body formed of a ceramic in such a manner that defects such as generation of cracks, and peeling, and a manufacturing yield is satisfactory are not easily generated.

Disclosed is a honeycomb ceramic article that exhibits a primary crystalline phase of cordierite having a coefficient of thermal expansion (CTE), wherein CTE<1.5×10⁻⁷/° C. over the temperature range of about 25° C. to about 800° C.; a total porosity, P, of at least 28%, a transverse I-ratio, I_T, of less than 0.92; and a pore size distribution wherein at least 60% of the total pore volume is comprised of pores having diameters between 0.5 μm and 5.0 μm. Also provided is a ceramic honeycomb article comprising a phase of cordierite and exhibiting a mean CTE<1.0×10⁻⁷/° C. (from 25 to 800° C.) in at least one direction, and 28%≦P≦33%. Methods of manufacturing ceramic articles comprising the aforementioned cordierite compositions are also disclosed.

A ceramic honeycomb filter comprising a sintered ceramic honeycomb body having porous partition walls defining flow paths, and plugs formed in predetermined flow paths for removing particulate matter from an exhaust gas passing through the porous partition walls, the sintered ceramic honeycomb body being formed by a cordierite-based ceramic material, at least part of the plugs comprising ceramic particles and an amorphous oxide matrix formed from colloidal oxide.

In a ceramic honeycomb structure having large numbers of flow paths partitioned by porous cell walls, the cell walls have a porosity of 55-75%, with an average pore diameter Da of 10-30 μm and a pore area ratio Sa of 10-30% on their surfaces, and the average length La of the pores at their openings and the average width Lb of the pores at depth La from the surfaces of the cell walls meet the condition of 1.1<Lb/La<5 in an arbitrary vertical cut surface of the cell walls. In the cordierite-based ceramic honeycomb structure, the ceramic contains Fe and a spinel, the amount of the spinel being 4% or less by an X-ray diffraction intensity ratio, and most of the spinel having particle sizes in a range of 0.01-5 μm.

According to the present invention, a porous material is characterized by comprising: a connected structure formed by combining silicon carbide which is an aggregate with cordierite which is a combining material in a state to hold a large number of pores, and having a porosity of 52 to 70% and a median pore diameter of 15 to 30 μm, and is a porous material having a high porosity and a high strength and having a remarkably low possibility of including defective portions such as cuts and the like causing liquid leakage in a case where the material is used as a filter.

An exhaust aftertreatment device for an internal combustion engine is disclosed which contains multiple, parallel channels of a porous material, such as cordierite or silicon carbide, in which about some of the channels are plugged at an upstream end and other channels remain unplugged. In one embodiment, the substrate has an SCR coating and the engine has a urea supply system. Other embodiments include using TWC and LNT formulations. Several washcoat configurations and other specific geometries and dimensions to encourage crossflow, diffusion, and adsorption are disclosed herein.

There are provided a honeycomb structure and a method of manufacturing the structure, capable of preventing or reducing generation of CO₂ or harmful gas during firing to thereby prevent or inhibit pollution and global warming, and capable of obtaining a honeycomb structure having few defects such as cracks and maintaining high strength and low thermal expansion. In a method of manufacturing a honeycomb structure, in which a forming material containing a cordierite forming material and an organic binder is kneaded and formed to prepare a honeycomb-shaped formed article (honeycomb formed article), and the prepared honeycomb formed article is fired to obtain a honeycomb-shaped structure (honeycomb structure) mainly composed of cordierite: the forming material containing a layered clay mineral whose layer charge (X) is 0.2<X≦2 in addition to the cordierite forming material and the organic binder is used; a total amount of at least one element selected from a group consisting of sodium, potassium, and calcium contained in the layered clay mineral is set to 0.5% by mass or less in terms of oxide with respect to a total with the cordierite forming material; and a content ratio of the organic binder is set to 5 parts by mass or less with respect to 100 parts by mass in total of the cordierite forming material and the layered clay mineral.

A process for producing a honeycomb structure by obtaining clay from a cordierite-forming raw material containing an alumina source, a silica source, and a magnesia source; and forming the clay into a honeycomb shape, wherein a material having, in its volume particle size distribution, a 50 volume % particle size (V50) [μm] of 1 to 25 μm is used, as each of alumina source, silica source, and magnesia source; and a material having, in the volume particle size distribution of the whole cordierite-forming raw material, a ratio of 90 volume % particle size (V_all90) [μm] to 10 volume % particle size (V_all10) [μm] [a volume particle size distribution ratio (V_all90/V_all10)] of 10 or less and a difference (V_all90−V_all10) between 90 volume % particle size (V_all90) [μm] and 10 volume % particle size (V_all10) [μm] of 25 μm or less is used, as the cordierite-forming raw material.

The invention discloses a porous ceramic-loaded catalyst used for biomass catalytic liquefaction, and belongs to the technical field of porous functional ceramic. A natural inorganic catalyst is taken as an active ingredient of the porous ceramic-loaded catalyst, is subjected to smashing, grinding, and screening, and is mixed with a ceramic aggregate, a pore forming agent, and a binder at a mass ratio of 30-40:40-50:5-10:10-15; an obtained mixture is processed so as to obtain a porous ceramic body material; the porous ceramic body material is subjected to drying, sintering, and activation so as to obtain the porous ceramic-loaded catalyst; wherein the active ingredient is one or a combination of a plurality of ingredients selected from dolomite, limestone, diatomite, kaoline, olivine, cordierite, montmorillonite, hydrotalcite, carnallite, beryl, celestite, and gypsum at random, and dolomite and montmorillonite preferably. The porous ceramic prepared via above steps can be taken as a catalyst of biomass pyrolysis liquidation processes and a reactor internal heat carrier at the same time, possesses activity on biomass pyrolysis processes, is capable of increasing bio oil yield, improving bio oil quality, and reducing biomass pyrolysis reaction conditions.

The invention provides a production method of anti-bacterial external wall tiles, wherein a glazing layer is applied on the tiles through the following steps: (A) spraying a ground glaze layer on a bottom green body, naturally air-drying the ground glaze layer to immobilize it; (B) spraying a layer of active water repellent to form a layer of hydrocarbon chains being hydrophobic; (C) spraying a cover glaze slurry, naturally air-drying the cover glaze slurry to form an antibacterial glaze slurry layer; and (D) spraying a protective glaze insulating layer. The cover glaze includes, by weight, 29% of quartz powder; 20% of potassium feldspar, 10% of wollastonite, 5.5% of calcite, 4% of dolomite, 2.5% of cordierite, 5% of zirconium phosphate, 6.5% of aluminum oxide, 2% of zinc oxide, 4.5% of a frit, 5% of zirconium silicate and 8% of titanium oxide. The anti-bacterial external wall tile is a novel functional ceramic product, has the anti-bacterial, mildew-proofing, decomposition and deodorization effects, can avoid invasion to human from various infections, can keep the external wall of buildings to be clean and can avoid mildew pollution.

The present invention provides a preparation method of integral type biomass tar cracking catalyst with high reaction intensity, high tar cracking rate and good selectivity. Said method includes the following steps: (1), using oxalic acid to treat carrier: placing the cordierite in the constant-boiling oxalic acid solution whose concentration is 30-40%, treating for 20-30 min, drying and calcining; (2),coating liquor coating: making nano-grade gamma-Al2O3 be mixed with ethyl alcohol and water, grinding them, placing the above-mentioned cordierite into the above-mentioned solution, soaking said cordierite, at the same time vacuum pumping for 40-60 min, taking out residue, ageing, drying, calcining and repeatedly coating to make the coating rate be reached to 8-15%; (3), soaking by using active component solution: preparing Ni(NO3)2 solution, soaking the above-mentioned cordierite in the above-mentioned solution, ageing, drying, calcining and repeatedly coating to make its coating rate be up to above 5%.

The low melting solder glass contains, in wt. % on an oxide basis, >1-2, SiO₂; 5-10, B₂O₃; 4.5-12, ZnO; 79-88, Bi₂O₃; and 0.6-2, Al₂O₃, and a weight ratio of SiO₂ to Al₂O₃ of <2. The solder glass preferably contains from 80.5 to 85 wt. % of Bi₂O₃ and is free of lead. This solder glass has a linear thermal expansion coefficient α_(20-300) of <11.5×10⁻⁶/K and a transformation temperature Tg of <380° C. A solder glass preparation for connecting or sealing a glass part with a metal part contains the low melting solder glass and up to 20 wt. % of β-eukryptite, cordierite, mullite, willemite or zircon.

The invention relates to a preparation method for an oxidation catalyst used for purifying diesel exhaust and belongs to the technical field of catalysis. The catalyst has a higher conversion ratio to hydrocarbon and carbon monoxide inside the diesel exhaust, and can be used for oxidizing nitric oxide into nitrogen dioxide. The catalyst takes cordierite honeycomb ceramics or Fe-Cr-Al metallic honeycombs as a base body, takes a titanium, silicon and aluminum composite oxide and a molecular sieve as coating layers, and takes Pt or/and Pd as an active component. The catalyst is divided into two layers adopting use levels of Pt and Pd in varying proportions, so as to adjust the proportion of the nitrogen dioxide in the exhaust. The oxidation catalyst can effectively lower HC and CO of gaseous phases in diesel engine exhaust, can effectively improve the oxygenation efficiency of NO, and has better heat stability.