WO2018012561A1 - Structure en nid d'abeille - Google Patents

Structure en nid d'abeille Download PDF

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Publication number
WO2018012561A1
WO2018012561A1 PCT/JP2017/025474 JP2017025474W WO2018012561A1 WO 2018012561 A1 WO2018012561 A1 WO 2018012561A1 JP 2017025474 W JP2017025474 W JP 2017025474W WO 2018012561 A1 WO2018012561 A1 WO 2018012561A1
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Prior art keywords
honeycomb structure
honeycomb
central axis
fired body
partition
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PCT/JP2017/025474
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English (en)
Japanese (ja)
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真之助 後藤
健太 野村
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イビデン株式会社
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Publication of WO2018012561A1 publication Critical patent/WO2018012561A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
    • B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B01J23/56—Platinum group metals
    • B01J23/63—Platinum group metals with rare earths or actinides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
    • B01J35/56—Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional monoliths

Definitions

  • the present invention relates to a honeycomb structure.
  • Exhaust gas discharged from internal combustion engines such as automobiles contains harmful gases such as carbon monoxide (CO), nitrogen oxides (NOx), and hydrocarbons (HC).
  • An exhaust gas purification catalyst that decomposes such harmful gases is also called a three-way catalyst, and a catalyst layer is provided by washing a slurry containing noble metal particles having catalytic activity on a honeycomb monolith substrate made of cordierite or the like. Things are common.
  • Patent Document 1 discloses an exhaust gas purification catalyst in which a monolith base material includes ceria-zirconia composite oxide particles and ⁇ -phase alumina particles, and the monolith base material carries noble metal particles.
  • Patent Document 2 discloses a ceramic honeycomb structure including cells arranged radially, which is used as a catalyst carrier in an automobile exhaust system.
  • thermal stress is reduced by a radial web extending to the outer periphery, and the strength of the obtained structure is improved.
  • Patent Document 1 since the bulk density is reduced by using a material having a catalyst carrier function and a promoter function by itself without using cordierite as the material of the monolith substrate, the monolith substrate The temperature of the catalyst is likely to rise, and the warm-up performance of the catalyst can be improved.
  • Patent Document 1 does not specifically examine the honeycomb structure of the monolith substrate, and it can be said that there is room for improving the exhaust gas purification performance.
  • Patent Document 2 describes improvement in strength by arranging cells in a radial manner, but does not recognize improvement in exhaust gas purification performance. Depending on the shape of the cell, exhaust gas purification performance decreases. There is a risk.
  • the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a honeycomb structure having high thermal shock resistance and high exhaust gas purification performance.
  • the honeycomb structure of the present invention is a honeycomb structure including a honeycomb fired body in which a plurality of through-holes are arranged in parallel in the longitudinal direction with a partition wall therebetween, and the honeycomb fired body includes ceria-zirconia composite oxide particles. And in the cross section perpendicular to the central axis of the honeycomb structure, the plurality of through holes have a first partition wall extending radially from the central axis and the central axis. And part or all of the first partition wall does not continuously extend from the central axis of the honeycomb structure to the outermost periphery, and the first partition wall is surrounded by the second partition wall provided concentrically. It intersects the second partition wall in a T shape.
  • a honeycomb fired body is constituted by an extrusion-molded body containing ceria-zirconia composite oxide particles and alumina particles. Therefore, warm-up performance can be improved as compared with the case where cordierite is used as the material of the honeycomb fired body.
  • the warm-up performance of the catalyst means the length of time until the exhaust gas purification performance sufficient as a catalyst can be exhibited after the engine is started. This means that the exhaust gas purification performance can be sufficiently exhibited in a short time after starting.
  • a plurality of through holes are provided concentrically with the first partition wall extending in the radial direction from the central axis and the central axis. It is formed by being surrounded by the formed second partition wall. That is, a plurality of through holes are arranged radially. Therefore, since thermal stress can be reduced, thermal shock resistance can be improved.
  • part or all of the first partition walls extending in the radial direction from the central axis does not continuously extend from the central axis of the honeycomb structure to the outermost periphery, and the central axis is the center.
  • Crosses in a T-shape with the second partition wall provided concentrically Therefore, as compared with a case where all the first partition walls continuously extend from the central axis of the honeycomb structure to the outermost periphery, a portion where the first partition walls and the second partition walls intersect in a cross shape is reduced.
  • the exhaust gas is more easily diffused into the partition wall than in the cross-shaped portion.
  • the supported catalyst can be used effectively.
  • the first partition and the second partition intersect each other in a T-shape.
  • the intersection of the center line of the first partition and the center line of the second partition is the center line of the other first partition and the second partition. The state that does not coincide with the intersection with the center line.
  • the thermal shock resistance can be enhanced, but also the exhaust gas purification performance can be enhanced.
  • the honeycomb structure of the present invention it is desirable that 70% or more of the intersecting portions of the first partition walls and the second partition walls intersect in a T shape. Since gas is not easily diffused at the center of the portion where the first partition wall and the second partition wall intersect in a cross shape, 70% or more of the intersecting portions of the first partition wall and the second partition wall intersect in a T shape. In this case, it is possible to reduce the catalyst that cannot be used effectively even if it is supported on the partition walls.
  • the area of the through hole in the outer peripheral portion is 0.9 to 1.1 times the area of the through hole in the central portion. desirable.
  • the cross-sectional area of the through-holes increases from the central axis of the honeycomb structure toward the outermost periphery, and the exhaust gas flows from the central portion. It becomes easy to flow to the outer periphery.
  • the cross-sectional area of the through hole in the outer peripheral portion can be made substantially equal to the cross-sectional area of the through portion in the central portion.
  • the alumina particles are desirably ⁇ -phase alumina particles.
  • the ⁇ -phase alumina particles as the partition material for the ceria-zirconia composite oxide, the size of the pores in the partition walls can be increased, so that the gas easily diffuses into the partition walls.
  • the alumina particles into the ⁇ phase the phase change of alumina in the exhaust gas can be suppressed, so that the heat resistance can be increased.
  • the ratio of the length to the diameter of the honeycomb structure is preferably 0.5 to 0.9.
  • the honeycomb structure preferably has a diameter of 130 mm or less.
  • the diameter of the honeycomb structure By setting the diameter of the honeycomb structure to 130 mm or less, the temperature distribution in the honeycomb structure can be reduced, so that damage due to thermal shock can be prevented.
  • a noble metal is supported on the honeycomb fired body. Since the honeycomb fired body made of an extrusion-molded body containing ceria-zirconia composite oxide particles and alumina particles itself has a catalyst carrier function and a promoter function, a noble metal can be directly supported on the honeycomb fired body. Furthermore, by directly supporting the noble metal on the honeycomb fired body, the temperature of the honeycomb structure easily rises, so that the warm-up performance can be improved.
  • FIG. 1 is a perspective view schematically showing an example of the honeycomb structure of the present invention.
  • FIG. 2 is a partially enlarged view of a cross section taken along line AA of the honeycomb structure shown in FIG.
  • the honeycomb structure of the present invention includes a honeycomb fired body in which a plurality of through holes are arranged in parallel in the longitudinal direction with partition walls therebetween.
  • the plurality of through holes include a first partition extending radially from the central axis, and a second partition provided concentrically around the central axis. It is formed by being surrounded by.
  • the central axis of the honeycomb structure refers to a straight axis that passes through the center of gravity of both end surfaces when the end surface is the surface where the through holes are present.
  • the first partition walls are allowed even if they are not provided radially around the central axis.
  • the second partition is allowed even if it is not provided concentrically around the central axis strictly.
  • the “radial center position” and the “concentric center position” are the above-mentioned lengths with a radius from the center axis. It suffices if it is within a range of about 3% of R.
  • the honeycomb structure of the present invention preferably has a columnar shape, but may have another column shape.
  • the shape of the cross section perpendicular to the central axis of the honeycomb structure of the present invention is preferably circular, but may be other shapes, for example, an elliptical shape or a racetrack shape. .
  • the honeycomb fired body is formed of an extrusion-molded body containing ceria-zirconia composite oxide particles (hereinafter also referred to as CZ particles) and alumina particles.
  • CZ particles ceria-zirconia composite oxide particles
  • the honeycomb fired body is manufactured by extruding and firing a raw material paste containing CZ particles and alumina particles. It can be confirmed by X-ray diffraction (XRD) that the honeycomb structure of the present invention has the components described above.
  • the honeycomb structure of the present invention may include a single honeycomb fired body, or may include a plurality of honeycomb fired bodies bonded through an adhesive layer.
  • an outer peripheral coat layer may be formed on the outer peripheral surface of the honeycomb fired body.
  • FIG. 1 is a perspective view schematically showing an example of the honeycomb structure of the present invention.
  • FIG. 2 is a partially enlarged view of a cross section taken along line AA of the honeycomb structure shown in FIG.
  • FIG. 1 shows a smaller number of through holes than FIG.
  • a honeycomb structure 1 shown in FIGS. 1 and 2 includes a single honeycomb fired body 11 in which a plurality of through holes 20 are arranged in parallel in the longitudinal direction (vertical direction in FIG. 1) with partition walls 30 (31 and 32) interposed therebetween. It has.
  • the honeycomb fired body 11 is made of an extrusion-molded body containing CZ particles and alumina particles.
  • the plurality of through holes 20 include a first partition wall 31 extending radially from the central axis Z and a second partition wall provided concentrically around the central axis Z. 32.
  • part or all of the first partition walls extending in the radial direction from the central axis do not continuously extend from the central axis to the outermost periphery of the honeycomb structure, and are concentric with the central axis as the center. It intersects with the second partition provided in the shape of a T-shape.
  • the second partition wall having the same distance from the central axis is not continuously formed, and there may be a portion intersecting the first partition wall in a T-shape.
  • the second partition walls having the same length from the central axis are preferably formed continuously.
  • the honeycomb structure of the present invention it is only necessary that at least a part of the intersecting portion of the first partition wall and the second partition wall intersects in a T shape. Specifically, it is desirable that 50% or more of the intersecting portions of the first partition and the second partition intersect in a T shape, and more desirably 70% or more intersect in a T shape. . The entire intersection of the first partition and the second partition may intersect in a T shape, but 95% or less of the intersection of the first partition and the second partition intersects in a T shape. It is desirable.
  • the position where the first partition wall and the second partition wall intersect in a T-shape is not particularly limited, but from the viewpoint of improving the thermal shock resistance, it is more than the outer peripheral portion of the honeycomb structure body. It is desirable that there are many portions where the first partition and the second partition intersect in a T-shape at the center. Also, from the viewpoint of making the cross-sectional area of the through-hole in the outer peripheral portion of the honeycomb structure substantially equal to the cross-sectional area of the through-hole in the central portion, the first partition wall and the second partition are located more centrally than the outer peripheral portion of the honeycomb structure. It is desirable that there are many portions where the partition walls intersect in a T-shape.
  • the honeycomb structure 75% or more and 98% or less of the intersecting portions of the first partition walls and the second partition walls intersect in a T shape, and in the outer peripheral portion of the honeycomb structure body It is desirable that 65% or more and 95% or less of the intersecting portions of the first partition and the second partition intersect in a T shape. In this case, it is desirable that 65% or more and 95% or less of the intersecting portions of the first partition walls and the second partition walls intersect in a T-shape except for the central portion and the outer peripheral portion of the honeycomb structure.
  • the “central portion of the honeycomb structure” refers to a region having a radius of 1/3 from the central axis toward the outermost periphery in a cross section perpendicular to the central axis of the honeycomb structure.
  • the “outer peripheral portion of the honeycomb structure” refers to a region having a radius of 1/3 from the outermost periphery toward the central axis in a cross section perpendicular to the central axis of the honeycomb structure.
  • the area of the through hole in the outer peripheral portion is preferably 0.9 to 1.1 times the area of the through hole in the central portion. 0.95 to 1.05 times more desirable.
  • the cross-sectional area of the through hole in the outer peripheral portion can be made substantially equal to the cross-sectional area of the through portion in the central portion.
  • the cross-sectional area of the through-hole in the outer peripheral portion means a through-hole present in a region having a radius of 1/3 from the outermost periphery toward the central axis in a cross section perpendicular to the central axis of the honeycomb structure. Of these, it refers to the area of the largest through hole.
  • the “cross-sectional area of the through-hole in the central portion” is a cross-section perpendicular to the central axis of the honeycomb structure, and among the through-holes existing in a region of 1/3 of the radius from the central axis toward the outermost periphery, The area of the largest through hole.
  • the shape of the through hole of the honeycomb fired body is two first partition walls that are linear and an arc shape, excluding the through hole including the central axis.
  • the shape is surrounded by two second partitions.
  • the shape of the through hole including the central axis may be a fan shape surrounded by two first partition walls and one second partition wall, or may be a circle surrounded by one second partition wall. May be.
  • the average particle size of CZ particles constituting the honeycomb fired body is not particularly limited, but is preferably 1 to 10 ⁇ m from the viewpoint of improving gas purification performance and warm-up performance. More desirably, it is 5 ⁇ m.
  • the average particle diameter of the alumina particles constituting the honeycomb fired body is not particularly limited, but is preferably 1 to 10 ⁇ m from the viewpoint of improving gas purification performance and warm-up performance. More desirably, it is 5 ⁇ m.
  • the average particle size of CZ particles and alumina particles constituting the honeycomb fired body can be obtained by taking an SEM photograph of the honeycomb fired body using a scanning electron microscope (SEM, S-4800 manufactured by Hitachi High-Tech). it can.
  • the content ratio of CZ particles is preferably 35 to 65% by weight.
  • the content of alumina particles is preferably 15 to 35% by weight.
  • the ceria-zirconia composite oxide constituting the CZ particles is a material used as a promoter (oxygen storage material) of the exhaust gas purification catalyst.
  • ceria and zirconia desirably form a solid solution.
  • the ceria-zirconia composite oxide is obtained by, for example, adding ammonia water to an aqueous solution in which a cerium salt (cerium nitrate, etc.) and a zirconium salt (zirconium oxynitrate, etc.) are dissolved to produce a coprecipitate.
  • the ceria-zirconia composite oxide may further contain a rare earth element other than cerium.
  • rare earth elements scandium (Sc), yttrium (Y), lanthanum (La), praseodymium (Pr), neodymium (Nd), samarium (Sm), gadolinium (Gd), terbium (Tb), dysprosium (Dy), Examples thereof include ytterbium (Yb) and lutetium (Lu).
  • the ceria-zirconia composite oxide preferably contains 30% by weight or more, more preferably 40% by weight or more, and on the other hand, it preferably contains 90% by weight or less of ceria. It is more desirable to contain 80% by weight or less.
  • the ceria-zirconia composite oxide preferably contains 60% by weight or less of zirconia, and more preferably contains 50% by weight or less. Since such a ceria-zirconia composite oxide has a small heat capacity, the temperature of the honeycomb structure easily rises, and the warm-up performance can be improved.
  • the kind of the alumina particles is not particularly limited, but is desirably ⁇ -phase alumina particles (hereinafter also referred to as ⁇ -alumina particles).
  • ⁇ -alumina particles As the partition material for the ceria-zirconia composite oxide, the size of the pores in the partition walls can be increased, so that the gas easily diffuses into the partition walls.
  • the alumina particles into the ⁇ phase the phase change of alumina in the exhaust gas can be suppressed, so that the heat resistance can be increased.
  • the honeycomb fired body preferably includes inorganic particles used as an inorganic binder during production, and more preferably includes ⁇ -alumina particles derived from boehmite.
  • the honeycomb fired body preferably includes inorganic fibers, and more preferably includes ⁇ -alumina fibers.
  • the honeycomb fired body contains inorganic fibers such as ⁇ -alumina fibers, the mechanical properties of the honeycomb structure can be improved.
  • the ratio of the length to the diameter of the honeycomb structure is preferably 0.5 to 0.9, and preferably 0.6 to 0.8. More desirable.
  • the honeycomb structure preferably has a diameter of 130 mm or less, and more preferably 125 mm or less.
  • the honeycomb structure preferably has a diameter of 85 mm or more.
  • the thickness of the partition walls of the honeycomb fired body is desirably uniform. Specifically, the thickness of the partition walls of the honeycomb fired body is desirably 0.05 to 0.50 mm, and more desirably 0.10 to 0.30 mm.
  • the density of the through holes in the cross section perpendicular to the longitudinal direction of the honeycomb fired body is preferably 31 to 155 holes / cm 2 .
  • the porosity of the honeycomb fired body is preferably 40 to 70%.
  • the porosity of the honeycomb fired body can be measured by a mercury intrusion method under the conditions of a contact angle of 130 ° and a surface tension of 485 mN / m.
  • the thickness of the outer peripheral coat layer is preferably 0.1 to 2.0 mm.
  • a noble metal is supported on the honeycomb fired body.
  • the noble metal include platinum group metals such as platinum, palladium, and rhodium.
  • the loading amount of the noble metal is desirably 0.1 to 15 g / L, and more desirably 0.5 to 10 g / L.
  • the loading amount of the noble metal refers to the weight of the noble metal per apparent volume of the honeycomb structure.
  • the apparent volume of the honeycomb structure is a volume including the void volume, and includes the volume of the outer peripheral coat layer and / or the adhesive layer.
  • the method for manufacturing a honeycomb structure of the present invention is a method for manufacturing a honeycomb structure including a honeycomb fired body in which a plurality of through holes are arranged in parallel in the longitudinal direction with partition walls therebetween, and the ceria-zirconia composite oxide particles And forming a raw material paste containing alumina particles to form a honeycomb formed body in which a plurality of through holes are arranged in parallel in the longitudinal direction with a partition wall therebetween, and firing the honeycomb formed body, And a firing step for producing a honeycomb fired body.
  • Examples of other raw materials used when preparing the raw material paste include inorganic fibers, inorganic binders, organic binders, pore formers, molding aids, and dispersion media.
  • alumina a silica, silicon carbide, a silica alumina, glass, potassium titanate, an aluminum borate etc.
  • alumina fibers are desirable, and ⁇ -alumina fibers are particularly desirable.
  • the aspect ratio of the inorganic fiber is preferably 5 to 300, more preferably 10 to 200, and even more preferably 10 to 100.
  • Boehmite is an alumina monohydrate represented by the composition of AlOOH and is well dispersed in a medium such as water. Therefore, it is desirable to use boehmite as an inorganic binder.
  • Methylcellulose, carboxymethylcellulose, hydroxyethylcellulose, polyethyleneglycol, a phenol resin, an epoxy resin etc. are mentioned, You may use 2 or more types together.
  • a pore making agent for example, an acrylic resin, coke, starch, etc. are mentioned. In the present invention, it is desirable to use two or more of acrylic resin, coke and starch.
  • the pore-forming agent refers to a material used for introducing pores into the fired body when the fired body is produced.
  • CZ particles 40 to 60% by weight
  • Alumina particles 15 to 35% by weight
  • ⁇ -alumina fiber 5 to 15% by weight
  • boehmite 10 to 20% by weight
  • the raw material paste When preparing the raw material paste, it is desirable to mix and knead, and it may be mixed using a mixer, an attritor or the like, or may be kneaded using a kneader or the like.
  • the die of the mold for producing the honeycomb molded body includes slits cut concentrically with respect to the center, and slits cut radially from the center. It is desirable that the slits that are radially cut are not continuously extended from the center but intersect with the slits that are cut concentrically in a T-shape.
  • the honeycomb formed body can be dried to produce a honeycomb dried body. desirable.
  • a dryer such as a microwave dryer, hot air dryer, dielectric dryer, vacuum dryer, vacuum dryer, freeze dryer, etc.
  • honeycomb formed body and the honeycomb dried body before the firing step are collectively referred to as a honeycomb formed body.
  • the honeycomb fired body is fired to produce a honeycomb fired body.
  • this process performs degreasing and firing of the honeycomb formed body, it can also be referred to as a “degreasing / firing process”, but it is referred to as “a firing process” for convenience.
  • a honeycomb structure can be manufactured by the above process.
  • the through-holes of the honeycomb fired body constituting the honeycomb structure can have a predetermined shape and arrangement.
  • the plurality of through-holes have a first partition extending radially from the central axis, and a second partition provided concentrically around the central axis.
  • a part or all of the first partition wall does not continuously extend from the central axis of the honeycomb structure to the outermost periphery, and intersects the second partition wall in a T-shape.
  • the amount of the noble metal supported in the supporting step is preferably 0.1 to 15 g / L, and more preferably 0.5 to 10 g / L.
  • the outer peripheral coat layer is coated with the outer peripheral coat layer paste on the outer peripheral surface excluding both end faces. Thereafter, it can be formed by drying and solidifying.
  • the outer coat layer paste include the same composition as the raw material paste.
  • the honeycomb structured body in which a plurality of honeycomb fired bodies are bonded via an adhesive layer has an adhesive layer paste on the outer peripheral surface excluding both end faces of the plurality of honeycomb fired bodies. After applying and adhering, it can be produced by drying and solidifying.
  • the adhesive layer paste include those having the same composition as the raw material paste.
  • Example 1 5279 parts by weight of CZ particles (average particle diameter: 2 ⁇ m), 2640 parts by weight of ⁇ -alumina particles (average particle diameter: 2 ⁇ m), and 1056 parts by weight of ⁇ -alumina fibers (average fiber diameter: 3 ⁇ m, average fiber length: 60 ⁇ m) Part, 2262 parts by weight of boehmite as an inorganic binder, 1549 parts by weight of methylcellulose as an organic binder, 422 parts by weight of acrylic resin as a pore-forming agent, 528 parts by weight of coke as a pore-forming agent, and a surfactant as a molding aid
  • a raw material paste was prepared by mixing and kneading 845 parts by weight of a certain polyoxyethylene oleyl ether and 5420 parts by weight of ion-exchanged water.
  • the raw material paste was extruded using an extruder to produce a honeycomb formed body. Then, using a vacuum microwave dryer, the honeycomb formed body was dried at an output of 1.74 kW and a reduced pressure of 6.7 kPa for 12 minutes, and then degreased and fired at 1100 ° C. for 10 hours to produce a honeycomb fired body. .
  • the honeycomb fired body manufactured in Example 1 has a cylindrical shape with a diameter of 103 mm and a length of 80 mm, a density of through holes of 77.5 holes / cm 2 (500 cpsi), and a partition wall thickness of 0.2 mm. 127 mm (5 mil).
  • the honeycomb fired body manufactured in Example 1 has the cell arrangement shown in FIG.
  • a first partition extending in the radial direction from the central axis, and the central axis
  • a plurality of through holes are formed by being surrounded by a second partition wall concentrically provided at the center, and a part of the first partition wall does not continuously extend from the central axis of the honeycomb fired body to the outermost periphery. , Intersected with the second partition wall in a T-shape.
  • Comparative Example 1 A honeycomb fired body was produced in the same manner as in Example 1. However, in Comparative Example 1, the shape of the mold when the raw material paste was extruded was changed.
  • the honeycomb fired body manufactured in Comparative Example 1 has a cylindrical shape with a diameter of 103 mm and a length of 80 mm, a density of through holes of 77.5 holes / cm 2 (500 cpsi), and a partition wall thickness of 0.2 mm. 127 mm (5 mil).
  • the shape of the through hole in the cross section perpendicular to the central axis of the honeycomb fired body was square.
  • Comparative Example 2 A honeycomb fired body was produced in the same manner as in Example 1. However, in Comparative Example 2, the shape of the mold when the raw material paste was extruded was changed.
  • the honeycomb fired body manufactured in Comparative Example 2 has a cylindrical shape with a diameter of 103 mm and a length of 80 mm, a density of through holes of 77.5 holes / cm 2 (500 cpsi), and a partition wall thickness of 0.2 mm. 127 mm (5 mil).
  • the honeycomb fired body manufactured in Comparative Example 2 includes a first partition wall extending in a radial direction from the central axis in a cross section perpendicular to the central axis of the honeycomb fired body, and a second partition wall provided concentrically around the central axis. A plurality of through-holes were formed by being surrounded by, and almost all of the first partition walls continuously extended from the central axis of the honeycomb fired body to the outermost periphery, and crossed the second partition walls in a cross shape.
  • honeycomb catalyst having the honeycomb fired body supporting palladium and a rhodium catalyst.
  • the amount of catalyst supported was 0.14 g / L per apparent volume of the honeycomb fired body in total of palladium and rhodium.
  • honeycomb catalyst of each example and comparative example is set in a V-type 6-cylinder 3.5L engine, and the HC concentration ((HC inflow ⁇ HC outflow) / (HC inflow)) ⁇ 100 from the start of the stoichiometric engine. ) was measured to be 50% or less, and the catalyst warm-up performance was evaluated.
  • Example 1 The temperature at which the HC concentration was 50% or less was 250 ° C. in Example 1, and 340 ° C. in Comparative Examples 1 and 2. Thus, in Example 1, since HC concentration was 50% or less at a lower temperature than Comparative Examples 1 and 2, it was confirmed that the exhaust gas purification performance, particularly warm-up performance was excellent. .

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Abstract

Cette structure en nid d'abeilles comprend un corps en nid d'abeilles fritté ayant une pluralité de trous traversants qui sont disposés en parallèle dans la direction longitudinale et qui ont des parois de séparation interposées entre eux. Le corps en nid d'abeilles fritté comprend un corps moulé par extrusion comprenant des particules d'oxyde composite de cérium-zircone et des particules d'alumine. Dans une section transversale perpendiculaire à l'axe central de la structure en nid d'abeilles, la pluralité de trous traversants sont formés en étant entourés par: des premières parois de séparation s'étendant dans la direction radiale à partir de l'axe central; et de secondes parois de séparation disposées de manière concentrique autour de l'axe central. Tout ou une partie des premières parois de séparation est caractérisée en ce qu'elle ne s'étend pas en continu de l'axe central de la structure en nid d'abeilles à la circonférence la plus à l'extérieur mais qui croise les secondes parois de séparation, en forme de T.
PCT/JP2017/025474 2016-07-14 2017-07-13 Structure en nid d'abeille WO2018012561A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2016-139682 2016-07-14
JP2016139682A JP6782571B2 (ja) 2016-07-14 2016-07-14 ハニカム構造体

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