WO2015045559A1 - Structure et filtre en nid-d'abeilles - Google Patents

Structure et filtre en nid-d'abeilles Download PDF

Info

Publication number
WO2015045559A1
WO2015045559A1 PCT/JP2014/068298 JP2014068298W WO2015045559A1 WO 2015045559 A1 WO2015045559 A1 WO 2015045559A1 JP 2014068298 W JP2014068298 W JP 2014068298W WO 2015045559 A1 WO2015045559 A1 WO 2015045559A1
Authority
WO
WIPO (PCT)
Prior art keywords
honeycomb structure
inorganic
fiber layer
binder particles
inorganic binder
Prior art date
Application number
PCT/JP2014/068298
Other languages
English (en)
Japanese (ja)
Inventor
寛 岸田
ラジャン バンブルー
一 真木
Original Assignee
住友化学株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 住友化学株式会社 filed Critical 住友化学株式会社
Publication of WO2015045559A1 publication Critical patent/WO2015045559A1/fr

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • 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
    • B01D53/944—Simultaneously removing carbon monoxide, hydrocarbons or carbon making use of oxidation catalysts
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/0093—Other features
    • C04B38/0096—Pores with coated inner walls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/10—Noble metals or compounds thereof
    • B01D2255/102—Platinum group metals
    • B01D2255/1021—Platinum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/10—Noble metals or compounds thereof
    • B01D2255/102—Platinum group metals
    • B01D2255/1023—Palladium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/10—Noble metals or compounds thereof
    • B01D2255/102—Platinum group metals
    • B01D2255/1025—Rhodium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/10—Noble metals or compounds thereof
    • B01D2255/104—Silver
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/207—Transition metals
    • B01D2255/20723—Vanadium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/207—Transition metals
    • B01D2255/2073—Manganese
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/207—Transition metals
    • B01D2255/20738—Iron
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/207—Transition metals
    • B01D2255/20761—Copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/207—Transition metals
    • B01D2255/20776—Tungsten
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/50—Zeolites
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/90—Physical characteristics of catalysts
    • B01D2255/92—Dimensions
    • B01D2255/9207—Specific surface
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00793—Uses not provided for elsewhere in C04B2111/00 as filters or diaphragms
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/0081—Uses not provided for elsewhere in C04B2111/00 as catalysts or catalyst carriers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/022—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
    • F01N3/0222—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous the structure being monolithic, e.g. honeycombs

Definitions

  • the present invention relates to a honeycomb structure and a honeycomb filter.
  • the porous honeycomb structure has a structure in which one end of a plurality of through-holes formed in the honeycomb structure and the other end of the remaining portion are closed with a sealing portion, so that the trapped substance can be removed from the fluid containing the collected object. It can be used as a honeycomb filter for removing collected material.
  • the fluid When a fluid is introduced into the through-holes of the honeycomb filter, the fluid passes through innumerable pores formed in the partition walls partitioning the through-holes and is then discharged out of the honeycomb filter. And when a fluid permeate
  • honeycomb filter examples include an exhaust gas filter for purifying exhaust gas exhausted from an internal combustion engine such as a diesel engine or a gasoline engine (see, for example, Patent Document 1 below).
  • the collected matter When the collected matter is removed from the fluid using a conventional honeycomb structure or honeycomb filter, the collected matter accumulates in the pores formed in the partition walls of the honeycomb filter as the collected matter is collected. As a result, the pores are easily clogged. And after a to-be-collected object accumulates in a pore, an to-be-collected object also accumulates on the partition surface, and a through hole becomes narrow. As a result, it becomes difficult for the fluid to permeate the partition wall, or the fluid becomes difficult to pass through the through hole, and the pressure loss increases excessively.
  • the present inventors make it difficult for the trapped substances to be clogged by the pores, and the trapped substances are not easily deposited on the partition wall surfaces. And found that the pressure loss is reduced.
  • the present inventors faced a problem that when the honeycomb structure or the honeycomb filter vibrates, at least a part of the fiber layer is detached from the inner wall of the pore and / or the partition wall of the through hole.
  • the fiber layer is detached from the inner walls of the pores and / or the partition walls of the through holes, the trapped substances are clogged in the pores of the partition walls or deposited on the partition wall surfaces, thereby increasing the pressure loss.
  • Such a problem is manifested by, for example, vibration during actual operation of an automobile on which a honeycomb structure or a honeycomb filter is mounted.
  • the present invention has been made in view of the above-described problems of the prior art, and an object thereof is to provide a honeycomb structure that can suppress the detachment of the fiber layer, and a honeycomb filter including the honeycomb structure. To do.
  • a honeycomb structure according to one aspect of the present invention has a plurality of through holes partitioned by porous partition walls, and / or at least a part of the inner walls of the pores formed in the partition walls, and / or at least a part of the partition walls.
  • the fiber layer contains inorganic fibers and inorganic binder particles, and the center particle diameter of the inorganic binder particles is 10 ⁇ m or less.
  • the inorganic fiber content per unit volume of the honeycomb structure may be 20 g / L or less, and the inorganic binder particle content per unit volume of the honeycomb structure is 1 g / L or more and 10 g / L or less. Good.
  • the inorganic binder particles may contain aluminum hydroxide and / or aluminum oxide.
  • the average major axis of the inorganic fiber may be 10 to 500 ⁇ m.
  • the average minor axis of the inorganic fiber may be 0.10-50 ⁇ m.
  • the content of the silica component in the inorganic fiber may be 50% by mass or more.
  • the partition may contain at least one selected from the group consisting of aluminum titanate, cordierite, and silicon carbide.
  • the fiber layer may further contain a catalyst.
  • a honeycomb filter according to an aspect of the present invention includes the above honeycomb structure, a porous sealing portion formed at one end of a part of the plurality of through holes and the other end of the remaining part of the plurality of through holes. .
  • a honeycomb structure that can suppress the detachment of the fiber layer, and a honeycomb filter including the honeycomb structure.
  • FIG. 1 is a perspective view showing a honeycomb filter according to an embodiment of the present invention.
  • FIG. 2 is a view taken along the line II-II in FIG.
  • Fig. 3a is an enlarged view of the cross section of the partition wall of the honeycomb filter shown in Fig. 2, and is a schematic diagram showing a fiber layer formed on the inner wall of the pore.
  • Fig. 3b is a schematic view of a fiber layer included in the honeycomb filter according to the embodiment of the present invention.
  • FIG. 4 is a cross-sectional view showing a honeycomb filter according to another embodiment of the present invention.
  • FIG. 5 is a schematic view of an apparatus for measuring the pressure loss of fluid in the honeycomb filter.
  • honeycomb filter cartilage filter
  • an internal combustion engine such as a diesel engine or a gasoline engine
  • honeycomb structure provided in the filter
  • the honeycomb filter 1 includes a honeycomb structure 100 and a sealing portion 130 as described below. Both the honeycomb structure 100 and the sealing portion 130 are porous.
  • the honeycomb structure 100 is a cylindrical body having a plurality of through holes 110 arranged in parallel to each other, as shown in FIGS. 1 and 2. Each of the plurality of through holes 110 is partitioned by a partition wall 120 extending in parallel to the central axis of the honeycomb structure 100.
  • the through holes 110 are classified into some through holes (first through holes) 110a and the remaining through holes (second through holes) 110b.
  • One end of the through-hole 110a is opened as a gas inlet on one end face 100a of the honeycomb structure 100.
  • the other end portion of the through hole 110 a is closed by a sealing portion 130 on the other end surface 100 b of the honeycomb structure 100.
  • one end portion of the through hole 110b is closed by the sealing portion 130 on the one end surface 100a.
  • the other end of the through hole 110b opens as a gas outlet on the other end surface 100b.
  • the through hole 110b is adjacent to the through hole 110a.
  • the honeycomb structure 100 may have a lattice structure in which the through holes 110a and the through holes 110b are alternately arranged.
  • the through holes 110 a and 110 b are perpendicular to both end faces of the honeycomb structure 100.
  • the central axes of the through holes 110a and 110b may be located at the apexes of a plurality of squares.
  • the cross section perpendicular to the central axis direction (longitudinal direction) of the through holes 110a and 110b may be, for example, a square shape.
  • the partition wall 120 is porous.
  • the partition 120 may include a porous ceramic sintered body. As shown in FIG. 3 a, a large number of communicating pores 150 are formed in the porous partition wall 120.
  • the surface of the partition wall 120 (inner wall surface of the through hole 110a) facing the inside of the through hole 110a and / or the surface of the inner wall of the pore 150 formed in the partition wall 120 is And a fiber layer 140 containing inorganic fibers 140a.
  • the fiber layer 140 may cover the entire inner wall surface of the through hole 110a. Alternatively, the fiber layer 140 may cover only a part of the inner wall surface of the through hole 110a. The inner walls of all the through holes 110 a may be covered with the fiber layer 140. Only the inner wall of some of the through holes 110a among all the through holes 110a may be covered with the fiber layer 140. On the other hand, the inner walls of all the through holes 110b may not be covered with the fiber layer 140. In the cross section perpendicular to the longitudinal direction of the through hole 110a, the fiber layer 140 may be continuously formed on the surface of the partition wall 120 so as to surround the through hole 110a. That is, the fiber layer 140 may have an annular cross section along the inner wall of the through hole 110a. The thickness of the fiber layer 140 may be, for example, 5 to 500 ⁇ m.
  • the exhaust gas G is supplied into the through-hole 110a from the one end surface 100a.
  • the gas constituting the exhaust gas moves through the communicating pores 150 formed in the partition wall 120, reaches the adjacent through hole 110b, and is discharged from the other end surface 100b. That is, the gas constituting the exhaust gas can permeate the partition wall 120.
  • the collected matter (fine particles such as soot) in the exhaust gas is deposited and collected on the inside and on the surface of the fiber layer 140 covering the inner walls of the partition walls 120 and / or the pores 150.
  • the collected matter is removed from the exhaust gas G by the above principle.
  • the fiber layer 140 includes a large number of inorganic fibers 140a.
  • the honeycomb filter 1 including the fiber layer 140 can have an exhaust gas purification performance superior to that of the honeycomb filter not including the fiber layer 140. Further, in the honeycomb filter 1 having the fiber layer 140, the collected matter in the exhaust gas is deposited on the inside and the surface of the fiber layer 140, so that the collected matter is excessive on the inner walls of the partition walls 120 and / or the pores 150. It becomes difficult to deposit on. As a result, the pressure loss of the exhaust gas G in the honeycomb filter 1 is reduced.
  • the fiber layer 140 contains many inorganic fibers 140a and many inorganic binder particles 140b.
  • the inorganic binder particles 140b are fixed to the inorganic fibers 140a. That is, the inorganic binder particles 140b fix the inorganic fibers 140a to each other. In addition, the inorganic binder particles 140 b are fixed to the surface of the partition wall 120 and / or the inner wall surface of the pore 150. That is, the inorganic binder particle 140b fixes the surface of the partition wall 120 and the inorganic fiber 140a, or fixes the inner wall surface of the pore 150 and the inorganic fiber 140a. Specifically, a part of the inorganic binder particles 140b may be fixed to the inorganic fibers 140a by dehydration reaction or sintering.
  • a part of the inorganic binder particles 140b may be fixed to the surface of the partition wall 120 by dehydration reaction or sintering.
  • a part of the inorganic binder particles 140b may be fixed to the inner wall surfaces of the pores 150 by dehydration reaction or sintering.
  • the inorganic fiber 140a itself may be directly fixed to the surface of the partition wall 120 and / or the inner wall surface of the pore 150 by sintering.
  • the inorganic fibers 140a may be partially fixed by sintering.
  • 3a and 3b are schematic diagrams, and the structures of the pore 150 and the fiber layer 140 are not limited to those shown in FIG.
  • the inorganic fibers 140a are fixed to each other through the inorganic binder particles 140b. Further, the inorganic fiber 140a is fixed to the surface of the partition wall 120 and / or the inner wall surface of the pore 150 through the inorganic binder particle 140b. As a result, the fiber layer 140 adheres to the surface of the partition wall 120 and / or the inner wall surface of the pore 150. That is, the fiber layer 140 including the inorganic binder particles 140b is firmly fixed in the honeycomb filter 1 as compared with the fiber layer not including the inorganic binder particles 140b.
  • the fiber layer 140 is suppressed from being detached from the surface of the partition wall 120 and / or the inner wall surface of the pore 150. Due to the suppression of the detachment of the fiber layer 140, the collected matter is less likely to be clogged in the pores of the partition walls, and the collected matter is difficult to deposit on the partition surface. As a result, even if the honeycomb filter 1 continues to vibrate, the pressure loss of the exhaust gas G can be stably maintained at a lower level than before. That is, according to the honeycomb filter 1, the effect of reducing the pressure loss by the fiber layer 140 can be stably maintained under vibration (for example, vibration during actual driving of an automobile).
  • the center particle diameter of the inorganic binder particles 140b is 10 ⁇ m or less. As the inorganic binder particles 140b are smaller, the inorganic binder particles 140b are more easily supported on the inorganic fibers 140a. Therefore, the adhesion between the inorganic fibers 140a by the inorganic binder particles 140b is improved, the adhesion between the inorganic fibers 140a and the surface of the partition wall 120 is also improved, and the adhesion between the inorganic fibers 140a and the inner wall surfaces of the pores 150 is also improved. To do.
  • the lower limit value of the center particle diameter of the inorganic binder particles 140b is not particularly limited.
  • the center particle diameter of the inorganic binder particles 140b may be 0.01 ⁇ m or more and 10 ⁇ m or less.
  • the center particle diameter of the inorganic binder particles 140b may be 0.234 ⁇ m or more and 6.96 ⁇ m or less.
  • the central particle diameter may be an average particle diameter (D50) in a volume-based particle size distribution.
  • the inorganic binder particles 140b may be uniformly supported on the inorganic fibers 140a.
  • the surface of the inorganic fiber 140a may be uniformly coated with the inorganic binder particles 140b.
  • the inorganic binder particles 140 b may be dispersed in the fiber layer 140. Thereby, the detachment of the fiber layer 140 is easily suppressed even under vibration during actual driving of the automobile.
  • the inorganic binder particles 140b are uniformly supported on the inorganic fibers 140a, the heat resistance of the fiber layer 140 is improved, and the function or shape of the fiber layer 140 is maintained even when exposed to high temperatures. easy.
  • the factor that suppresses the detachment of the fiber layer 140 is not limited to the above factor.
  • the inorganic binder particles 140b may contain aluminum hydroxide or aluminum oxide. In this case, charge repulsion between the inorganic fibers 140a and the inorganic binder particles 140b is suppressed in the slurry that is the raw material of the fiber layer 140. As a result, the inorganic binder particles 140b are easily supported on the inorganic fibers 140a uniformly.
  • the inorganic binder particles 140b may be made only of aluminum hydroxide.
  • the inorganic binder particles 140b may be made only of aluminum oxide.
  • the inorganic binder particles 140b may be made of aluminum hydroxide and aluminum oxide.
  • the inorganic binder particles 140b may include an inorganic substance other than aluminum hydroxide and aluminum oxide. Another inorganic substance may be, for example, silicon oxide, titanium oxide, cerium oxide, zirconium oxide, cerium hydroxide, and zirconium hydroxide.
  • the BET specific surface area of the inorganic binder particles 140b may be 150 m 2 / g or more, or 200 m 2 / g or more. As the BET specific surface area is larger, the adhesion between the inorganic fibers 140a by the inorganic binder particles 140b is improved, the adhesion between the inorganic fibers 140a and the surfaces of the partition walls 120 is also improved, and the inner wall surfaces of the inorganic fibers 140a and the pores 150 The sticking property is also improved. In addition, the BET specific surface area of the inorganic binder particles 140b may be 500 m 2 / g or less.
  • the BET specific surface area of the inorganic binder particles 140b may be 150 m 2 / g or more and 500 m 2 / g or less, or 200 m 2 / g or more and 500 m 2 / g or less.
  • the content of the inorganic fibers 140a per unit volume of the honeycomb structure 100 may be, for example, 5 g / L or more and 20 g / L or less.
  • the content of the inorganic binder particles 140b per unit volume of the honeycomb structure 100 may be, for example, 1 g / L or more and 10 g / L or less.
  • each of the inorganic fibers 140a and the inorganic binder particles 140b The greater the content of each of the inorganic fibers 140a and the inorganic binder particles 140b, the more easily the detachment of the fiber layer 140 is suppressed. However, when there are too many inorganic fibers 140a and inorganic binder particles 140b, the flow path of the exhaust gas is narrowed and the pressure loss tends to increase. If each content of the inorganic fiber 140a and the inorganic binder particle 140b is within the above range, it is easy to achieve both suppression of the detachment of the fiber layer 140 and reduction of pressure loss.
  • the average major axis of the inorganic fibers 140a may be 10 to 500 ⁇ m, and may be 50 to 300 ⁇ m.
  • the average minor axis of the inorganic fibers 140a may be 0.10 to 50 ⁇ m and may be 1 to 10 ⁇ m.
  • the aspect ratio (major axis ⁇ minor axis) of the inorganic fiber 140a may be 5-100. In these cases, the purification performance can be further improved. Moreover, the excessive increase in the pressure loss accompanying the collection of the collection thing in the honeycomb structure 100 or the honeycomb filter 1 can be suppressed. When an average major axis and an average minor axis are more than the above-mentioned lower limit, initial collection efficiency of a thing to be collected is easy to improve.
  • the pressure loss is likely to be reduced.
  • the aspect ratio is higher, the adhesion between the inorganic fibers 140a by the inorganic binder particles 140b is more effectively improved, and the adhesion between the inorganic fibers 140a and the partition wall 120 is also more effectively improved. Adhesiveness between 140a and the inner wall surface of the pore 150 is also improved more effectively.
  • the average major axis and the average minor axis of the inorganic fiber 140a can be measured, for example, by the following procedure. First, the fiber layer 140 is observed with an electron microscope at a desired magnification (for example, 200 to 5000 times) to obtain an image containing a plurality of inorganic fibers 140a. Next, for example, ten arbitrary inorganic fibers 140a are selected in the obtained image. The major axis and the minor axis are measured for each of the ten selected inorganic fibers 140a. The average major axis can be obtained by calculating the average value of the major axes of the ten inorganic fibers 140a. By calculating the average value of the minor axis of the ten inorganic fibers 140a, the average minor axis can be obtained.
  • a desired magnification for example, 200 to 5000 times
  • the inorganic fibers 140a include biosoluble fibers, alumina fibers, mullite fibers, and refractant fibers. Moreover, you may use what made the fiber for the below-mentioned exhaust gas purification catalyst or the catalyst for urea decomposition into the fiber 140a.
  • the biosoluble fiber may be a fiber containing a silica component, a calcia component, a magnesia component, and an alkali component, for example. Content of the silica component in the inorganic fiber 140a may be 50 mass% or more.
  • the inorganic fiber 140a may include at least one component selected from the group consisting of alumina, titania, zirconia, aluminosilicate, mullite, cordierite, and aluminum titanate.
  • Content of the alkali component in the inorganic fiber 140a should just be 1000 mass ppm or less, or may be 500 mass ppm or less.
  • the alkali component such as NaO and / or K 2 O.
  • the fiber layer 140 may further contain a catalyst.
  • the catalyst may be, for example, an exhaust gas purification catalyst or a urea decomposition catalyst. In this case, the purification performance can be further improved.
  • the catalyst include transition metals such as copper, iron and silver; noble metals such as platinum, palladium and rhodium; zeolite, alumina, titania, silica and rare earths ion-exchanged with a mixture of two or more of these metals. And oxides, ceria-based complex oxides, zirconia-based complex oxides, perovskite-type complex oxides; and mixtures of two or more of these.
  • the oxide catalyst may carry a transition metal species such as copper, iron, manganese, vanadium, tungsten and silver; a noble metal species such as platinum, palladium and rhodium; or a mixture of two or more thereof. .
  • the fiber layer 140 may be a single layer containing the inorganic fibers 140a and the inorganic binder particles 140b, or may be a single layer containing a catalyst.
  • the fiber layer 140 may have a first layer containing the inorganic fibers 140a and the inorganic binder particles 140b and a second layer containing a substance (for example, a catalyst) different from the inorganic fibers 140a. In this case, for example, the second layer is stacked on the first layer.
  • the length of the honeycomb structure 100 in the central axis direction of the through holes 110a and 110b is, for example, 30 to 300 mm.
  • the outer diameter (diameter) of the honeycomb structure 100 is, for example, 10 to 300 mm.
  • the inner diameter of the cross section perpendicular to the central axis direction of the through holes 110a and 110b is, for example, 0.5 to 1.5 mm.
  • the cross section perpendicular to the central axis direction of the through hole is a square, the inner diameter of each through hole means the length of one side of the square.
  • the average thickness (cell wall thickness) of the partition wall 120 is, for example, 0.1 to 0.5 mm.
  • the porosity of the partition wall 120 may be, for example, 30 to 70% by volume.
  • the pore diameter of the partition wall 120 (inner diameter of the pore 150) may be, for example, 5 to 30 ⁇ m.
  • the porosity and pore diameter of the partition wall 120 can be adjusted by the particle diameter of the raw material, the amount of the pore-forming agent added, the kind of the pore-forming agent, or the firing conditions, and can be measured by a mercury intrusion method.
  • the partition 120 may include ceramics such as aluminum titanate, cordierite, silicon carbide, silicon nitride, or mullite.
  • the partition wall 120 may contain at least one selected from the group consisting of aluminum titanate, cordierite, and silicon carbide.
  • the partition 120 may further include magnesium and / or silicon.
  • the partition 120 may be, for example, porous ceramic (sintered body) made of an aluminum titanate crystal.
  • the aluminum titanate crystal phase may be, for example, a crystal phase of aluminum titanate or a crystal phase of aluminum magnesium titanate.
  • the shape of the honeycomb structure 100 is not necessarily limited to the shape described above.
  • the cross section of the through hole 110a perpendicular to the central axis direction of the through hole 110a may be triangular, hexagonal, octagonal, circular, or elliptical.
  • the through holes 110a having different diameters may be mixed.
  • the through holes 110a having different cross-sectional shapes may be mixed.
  • the arrangement of the through holes 110a is not particularly limited.
  • the central axis of the through hole 110a may be arranged at the vertices of a plurality of equilateral triangles.
  • the honeycomb structure 100 may be an elliptical column, a triangular column, a quadrangular column, a hexagonal column, an octagonal column, or the like.
  • the fiber layer 140 may be formed in the through-hole 110a and may be formed in the through-hole 110b.
  • the purification performance is improved not only in the through hole 110a but also in the through hole 110b.
  • honeycomb structure 100 is not limited to the honeycomb filter 1 described above.
  • a filter used for filtering food and drink such as beer; in order to selectively permeate gas components (for example, carbon monoxide, carbon dioxide, nitrogen, oxygen) generated during petroleum refining.
  • gas components for example, carbon monoxide, carbon dioxide, nitrogen, oxygen
  • a selective permeation filter or a catalyst carrier.
  • This manufacturing method may include a raw material preparation step (step a), a forming step (step b), a firing step (step c), a sealing step (step d), and a fiber layer forming step (step e).
  • a raw material preparation step step a
  • a forming step step b
  • a firing step step c
  • a sealing step step d
  • a fiber layer forming step step e
  • the raw material mixture may be prepared by kneading the inorganic compound powder and additives.
  • the inorganic compound powder includes an aluminum source powder such as ⁇ -alumina powder and a titanium source powder (titanium source powder).
  • the titanium source powder may be an anatase type or rutile type titania powder.
  • the inorganic compound powder may further contain a magnesium source powder such as magnesia powder and / or a silicon source powder.
  • the silicon source powder may be silicon oxide powder or glass frit.
  • the additive include a pore forming agent, a binder, a plasticizer, a dispersant, and a solvent.
  • a honeycomb-shaped formed body having a plurality of through holes partitioned by partition walls is obtained by forming the raw material mixture.
  • a so-called extrusion molding method in which the raw material mixture is extruded from a die while being kneaded by a single screw extruder can be employed.
  • the formed body is fired in an atmosphere (for example, air) at 1300 to 1650 ° C. to obtain a honeycomb-shaped sintered body having a plurality of through holes partitioned by partition walls.
  • the molded body Prior to firing the molded body, the molded body may be calcined to degrease the molded body or to remove a pore-forming agent or the like in the molded body.
  • the sealing step may be performed between the molding step and the firing step or after the firing step.
  • molding process and a baking process one edge part of each through-hole of a non-baking molded object is plugged up with a sealing thing.
  • a sealing portion that closes one end of the through hole is formed.
  • the sealing step is performed after the firing step, one end of each through hole of the honeycomb-shaped sintered body is closed with a sealing material.
  • a sealed portion for closing one end of the through hole is formed.
  • the sealing material the raw material mixture for the molded body can be used.
  • a slurry containing the inorganic fibers and the inorganic binder particles is prepared.
  • the sintered body in which the sealing portion is formed is immersed in the slurry, and the slurry is attached to the surface of the partition wall in the through hole of the sintered body.
  • the sintered body to which the slurry is attached is dried and fired to form a fiber layer.
  • the slurry may further contain a peptizer and water.
  • a peptizer When the slurry contains the peptizer, the aggregation of the inorganic binder particles is suppressed in the slurry, and the monodispersed inorganic binder particles are easily supported uniformly on the inorganic fibers.
  • Peptides include inorganic acids such as hydrochloric acid, sulfuric acid and nitric acid; or organic acids such as acetic acid and oxalic acid.
  • the amount of peptizer used industrially is preferably small in order to reduce damage to the firing furnace.
  • the pH of the slurry may be 1 or more and 6 or less, 2 or more and 5 or less, or 3.0 or more and 4.5 or less.
  • the pH of the slurry is within these ranges, charge repulsion between the inorganic fibers and the inorganic binder particles is easily suppressed in the slurry. As a result, the inorganic binder particles are uniformly supported on the inorganic fibers.
  • the drying conditions in the fiber layer forming step are not particularly limited.
  • the sintered body to which the slurry is attached may be dried in an atmosphere (for example, air) of 200 ° C. or lower.
  • the firing conditions in the fiber layer forming step are not particularly limited.
  • a sintered body to which slurry is attached may be fired in the atmosphere of 900 ° C. or lower. Further, the sintered body to which the slurry is attached may be fired in the atmosphere of 300 to 600 ° C. If the sintered body to which the slurry is attached is baked at a temperature within the above range, the particle size of the inorganic binder particles hardly changes before and after calcination, and the central particle size of the inorganic binder particles is maintained at 10 ⁇ m or less before and after calcination. It is easy to be done.
  • the inorganic binder particles contained in the slurry are aluminum hydroxide
  • the sintered body to which the slurry is attached is baked at a temperature within the above range, the sintered inorganic binder particles are also converted into aluminum hydroxide or oxidized. Composed of aluminum.
  • the lower the firing temperature the easier the aluminum hydroxide in the inorganic binder particles after firing remains.
  • the firing temperature is higher, the dehydration reaction of aluminum hydroxide proceeds, and the content of aluminum oxide in the inorganic binder particles after firing tends to increase.
  • the slurry further contains a catalyst.
  • the slurry containing no catalyst and an aqueous solution of the catalyst may be prepared. Then, after the sintered body is immersed in the slurry and dried, the sintered body is fired after the dried sintered body is immersed in the catalyst aqueous solution.
  • a honeycomb filter can be obtained through the above steps.
  • the said sealing process is unnecessary.
  • Example 1 ⁇ Evaluation of inorganic binder particles>
  • fine aluminum hydroxide was used as the inorganic binder particles.
  • Alkali components in the inorganic binder particles were analyzed by inductively coupled plasma (ICP) emission spectroscopy.
  • the content of the alkali component in the inorganic binder particles was 100 ppm by mass or less.
  • the aspect ratio of the inorganic binder particles was about 1.
  • fine aluminum hydroxide was dried at 200 ° C.
  • the BET specific surface area of the dried fine aluminum hydroxide was measured by the BET flow method.
  • Macsorb 1201 manufactured by Mountec Co., Ltd. was used.
  • a mixed gas of nitrogen gas and helium gas was used.
  • the ratio of nitrogen gas in the mixed gas was 30% by volume, and the ratio of helium gas in the mixed gas was 70% by volume.
  • the BET specific surface area of the fine aluminum hydroxide was 282 m 2 / g.
  • Fine aluminum hydroxide was dispersed in pure water, and 1N nitric acid (peptizer) was added to the dispersion to adjust the pH of the dispersion to 4.5.
  • the volume-based center particle diameter (D50) of the fine aluminum hydroxide in the dispersion whose pH was adjusted was measured with a laser diffraction particle size distribution analyzer.
  • a master sizer 2000 manufactured by Malvern was used as the measuring device.
  • the refractive index of fine aluminum hydroxide was set to 1.53. Table 1 below shows the center particle diameter (D50) of the fine aluminum hydroxide.
  • Biostar 100/99 manufactured by ITM, which is a biosoluble fiber, was used.
  • composition of the inorganic fibers analyzed by ICP emission spectroscopy was as follows. Content of silica component: about 75% by mass. Content of calcia component: about 12% by mass. Content of magnesia component: about 8.2% by mass. Content of alkali components (NaO and K 2 O): 330 mass ppm.
  • the aspect ratio of the inorganic fiber was about 33.
  • SN thickener 660T manufactured by San Nopco Co., Ltd. was used.
  • a cylindrical honeycomb structure having a plurality of through holes partitioned by porous partition walls was immersed in the slurry, whereby slurry was applied to the surfaces of the partition walls in each through hole.
  • the volume of the honeycomb structure was about 0.80 cc.
  • the honeycomb structure with the slurry applied on the surface of the partition walls was dried at 80 ° C. and then fired in the air at 500 ° C. for 50 minutes to obtain a honeycomb structure on which a fiber layer was formed.
  • the weight (initial weight) of the honeycomb structure having the fiber layer was measured. After measuring the initial weight, the honeycomb structure was heated in a box furnace at 500 ° C. for 50 minutes. The honeycomb structure after heating was directly poured into water kept at room temperature, and the honeycomb structure was washed with water. The honeycomb structure recovered from the water was dried at 80 ° C. for 1 hour or longer. The weight (final weight) of the honeycomb structure after drying was measured. And calculating a difference W A between the initial weight and final weight. W A corresponds to the weight of the desorbed fiber layer from the honeycomb structure during heating in a box furnace.
  • the fiber layer desorption rate in Example 1 is shown in Table 1 below.
  • the weight W I is determined from Equation 1 below.
  • the removal rate of the fiber layer can be obtained from the following formula 2.
  • a low desorption rate means that desorption of the fiber layer from the honeycomb structure is suppressed during the thermal shock test. Therefore, the lower the desorption rate, the better. It is preferably 30% or less, more preferably 28% or less, and particularly preferably 25% or less.
  • W C is the weight of the honeycomb structure before the thermal shock test (honeycomb structure fiber layer is formed).
  • W is the weight of the honeycomb structure before being immersed in the slurry.
  • Examples 2 to 6 The weight W (unit: g) and volume V (unit: cc) of the honeycomb structures (honeycomb structures before being immersed in the slurry) used in Examples 2 to 6 were values shown in Table 1 below.
  • the content (unit: g) of the inorganic binder particles in the slurries used in Examples 2 to 6 was adjusted to the values shown in Table 1 below.
  • the center particle diameter D50 (unit: ⁇ m) of the inorganic binder particles of Examples 1 to 6 measured by the same method as in Example 1 was the value shown in Table 1 below.
  • the pH of the slurry used in Examples 2 to 6 was adjusted to the values shown in Table 1 below.
  • the weight W I (unit: g) of the fiber layers of the honeycomb structures of Examples 2 to 6 was a value shown in Table 1 below.
  • the weight (unit: g / L) of the fiber layer per unit volume of the honeycomb structures of Examples 2 to 6 was a value shown in Table 1 below.
  • the weight of inorganic fibers per unit volume (unit: g / L) of the honeycomb structures of Examples 2 to 6 were the values shown in Table 1 below.
  • the weight (unit: g / L) of the inorganic binder particles per unit volume of the honeycomb structures of Examples 2 to 6 were values shown in Table 1 below.
  • a honeycomb structure having the fiber layers of Examples 2 to 6 was produced in the same manner as in Example 1 except for the above matters.
  • the desorption rate (unit:% by weight) of the fiber layers of Examples 2 to 6 measured by the same method as in Example 1 is shown in Table 1 below.
  • Comparative Examples 1 to 3 In Comparative Examples 1 to 3, coarse aluminum hydroxide was used as inorganic binder particles instead of fine aluminum hydroxide.
  • the content of alkali components (NaO and K 2 O) in the coarse-grained aluminum hydroxide analyzed by ICP emission spectroscopy was 50 ppm by mass or less.
  • the aspect ratio of the coarse aluminum hydroxide was about 1.
  • the BET specific surface area of the coarse aluminum hydroxides of Comparative Examples 1 to 3 measured by the same method as in Example 1 was 141 m 2 / g.
  • the center particle diameter D50 of coarse-grained aluminum hydroxide of Comparative Examples 1 to 3 measured by the same method as in Example 1 was a value shown in Table 1 below.
  • Comparative Example 3 an inorganic fiber different from the inorganic fiber used in Example 1 was used.
  • Comparative Example 3 “HP-FMX” manufactured by ITM was used as the inorganic fiber.
  • composition of the inorganic fiber of Comparative Example 3 analyzed by ICP emission spectroscopy was as follows. Content of alumina component: about 70% by mass Content of silica component: about 26% by mass. Content of alkali components (NaO and K 2 O): 40 mass ppm.
  • the aspect ratio of the inorganic fiber of Comparative Example 3 was about 17.
  • the weight W (unit: g) and volume V (unit: cc) of the honeycomb structures (honeycomb structures before being immersed in the slurry) used in Comparative Examples 1 to 3 were values shown in Table 1 below.
  • the content (unit: g) of the inorganic binder particles in the slurries used in Comparative Examples 1 to 3 was adjusted to the values shown in Table 1 below.
  • the pH of the slurries used in Comparative Examples 1 to 3 were the values shown in Table 1 below.
  • the weight W I (unit: g) of the fiber layer included in the honeycomb structures of Comparative Examples 1 to 3 was a value shown in Table 1 below.
  • the weight (unit: g / L) of the fiber layer per unit volume of the honeycomb structures of Comparative Examples 1 to 3 was the value shown in Table 1 below.
  • the weight of inorganic fibers per unit volume (unit: g / L) of the honeycomb structures of Comparative Examples 1 to 3 were the values shown in Table 1 below.
  • the weight (unit: g / L) of the inorganic binder particles per unit volume of the honeycomb structures of Comparative Examples 1 to 3 was the value shown in Table 1 below.
  • a honeycomb structure having the fiber layers of Comparative Examples 1 to 3 was manufactured in the same manner as in Example 1 except for the above matters.
  • the desorption rate (unit:% by weight) of the fiber layers of Comparative Examples 1 to 3 measured by the same method as in Example 1 is shown in Table 1 below.
  • Example 7 A mixed solution was prepared by mixing 0.42 g of fine aluminum hydroxide, 0.083 g of inorganic fibers, and 5 g of pure water. 1N aqueous nitric acid (peptizer) was added to this mixed solution to adjust the pH of the mixed solution to 3, and then a mixing treatment for the mixed solution by ultrasonic waves was performed for 10 minutes. The slurry of Example 7 was prepared by adding 0.208 g of thickener to the mixed solution after the mixing treatment.
  • Example 7 The fine aluminum hydroxide used in Example 7 was the same as that used in Example 1.
  • the inorganic fibers used in Example 7 were the same as those used in Example 1.
  • the thickener used in Example 7 was the same as that used in Example 1.
  • Example 7 a columnar honeycomb filter having a sealing portion was used instead of the honeycomb structure.
  • the honeycomb filter was made of aluminum titanate.
  • the diameter of the end face of the honeycomb filter was 2.14 cm.
  • the height of the honeycomb filter was 2.32 cm.
  • the weight of the honeycomb filter was 9.27 g.
  • the volume of the honeycomb filter was 0.0083L.
  • Example 7 The slurry of Example 7 was applied to the surface of the partition wall in each through hole of the honeycomb filter by a suction method.
  • the honeycomb filter with the slurry applied to the surface of the partition walls was dried at 80 ° C., and then fired in a box furnace at 500 ° C. for 50 minutes to obtain a honeycomb filter on which a fiber layer was formed.
  • the honeycomb filter 1 of Example 7 was placed in a housing 400 made of SUS.
  • the inner diameter of the housing 400 was 1.25 inches (31.75 mm).
  • Argon gas mixed with soot generated by the soot generator 402 is continuously supplied into the through-holes of the honeycomb filter 1 disposed in the housing 400 for 2 hours and 30 minutes to deposit soot in the honeycomb filter 1. It was.
  • the amount of soot accumulated in the honeycomb filter 1 was 1 g / L per unit volume of the honeycomb filter 1.
  • GFG-1000 manufactured by PALAS was used as the soot generator 402
  • the pressure loss (P 1 -P 2 ) in the honeycomb filter of Example 7 was 19.8 KPa.
  • the pressure loss in the honeycomb filter of Example 7 (honeycomb filter before applying slurry) before forming the fiber layer was measured by the same method as described above.
  • the pressure loss in the honeycomb filter of Example 7 before forming the fiber layer was 28.6 KPa.
  • the fiber layer detachment rate in the honeycomb filter of Example 7 measured by the same method as in Example 1 was 28% by weight.
  • Example 8 0.48 g of fine aluminum hydroxide, 0.096 g of inorganic fibers, 0.96 g of zirconia composite oxide catalyst, and 5 g of pure water were mixed to obtain a mixed solution. 1N aqueous nitric acid (peptizer) was added to the mixed solution to adjust the pH of the mixed solution to 3.5, and then a mixing process was performed on the mixed solution by ultrasonic waves for 10 minutes. The slurry of Example 8 was prepared by adding 0.208 g of thickener to the mixed solution after the mixing treatment.
  • 1N aqueous nitric acid (peptizer) was added to the mixed solution to adjust the pH of the mixed solution to 3.5, and then a mixing process was performed on the mixed solution by ultrasonic waves for 10 minutes.
  • the slurry of Example 8 was prepared by adding 0.208 g of thickener to the mixed solution after the mixing treatment.
  • Example 8 The fine aluminum hydroxide used in Example 8 was the same as that used in Example 1.
  • the inorganic fibers used in Example 8 were the same as those used in Example 1.
  • the thickener used in Example 8 was the same as that used in Example 1.
  • Example 8 a columnar honeycomb filter having a sealing portion was used instead of the honeycomb structure.
  • the honeycomb filter was made of aluminum titanate.
  • the diameter of the end face of the honeycomb filter was 2.24 cm.
  • the height of the honeycomb filter was 2.43 cm.
  • the weight of the honeycomb filter was 9.43 g.
  • the volume of the honeycomb filter was 0.0096L.
  • Example 8 The slurry of Example 8 was applied to the surface of the partition wall in each through hole of the honeycomb filter by a suction method.
  • the honeycomb filter with the slurry applied to the surface of the partition walls was dried at 80 ° C., and then fired in a box furnace at 500 ° C. for 50 minutes to obtain a honeycomb filter on which a fiber layer was formed.
  • the weight of the fiber layer was 0.64 g, and the weight of the fiber layer per unit volume of the honeycomb filter was 67 g / L.
  • Example 7 the pressure loss in the honeycomb filter on which the fiber layer of Example 8 was formed was determined.
  • the pressure loss (P 1 -P 2 ) in the honeycomb filter in which the fiber layer of Example 8 was formed was 24.8 KPa.
  • the pressure loss in the honeycomb filter of Example 8 (honeycomb filter before applying the slurry) before forming the fiber layer was measured by the same method as described above.
  • the honeycomb filter of Example 8 before forming the fiber layer was 22.8 KPa.
  • Comparative Example 4 Only 0.95 g of the zirconia composite oxide catalyst and 5 g of pure water were mixed to obtain a mixed solution. The mixing process with respect to the liquid mixture by ultrasonic waves was performed for 10 minutes. A slurry of Comparative Example 4 was prepared by adding 0.208 g of thickener to the mixed solution after the mixing treatment. The slurry of Comparative Example 4 does not contain inorganic fibers and inorganic binder particles. The thickener used in Comparative Example 4 was the same as that used in Example 1.
  • a cylindrical honeycomb filter having a sealing portion was used instead of the honeycomb structure.
  • the honeycomb filter was made of aluminum titanate.
  • the diameter of the end face of the honeycomb filter was 2.23 cm.
  • the height of the honeycomb filter was 2.44 cm.
  • the weight of the honeycomb filter was 9.66 g.
  • the volume of the honeycomb filter was 0.0095L.
  • the slurry of Comparative Example 4 was applied to the surface of the partition wall in each through hole of the honeycomb filter by a suction method. After drying the honeycomb filter having the slurry coated on the surface of the partition walls at 80 ° C., the honeycomb filter is fired in a box furnace at 500 ° C. for 50 minutes to form a catalyst layer composed of a zirconia composite oxide catalyst. A honeycomb filter was obtained. The weight of the catalyst layer was 0.8 g, and the weight of the catalyst layer per unit volume of the honeycomb filter was 84 g / L.
  • the pressure loss in the honeycomb filter of Comparative Example 4 (honeycomb filter before applying the slurry) before forming the catalyst layer was measured by the same method as described above.
  • the honeycomb filter of Comparative Example 4 before forming the catalyst layer was 22.8 KPa.
  • the fiber layer contains the above-described inorganic fibers and inorganic binder particles.
  • the particle diameter of the inorganic binder particles contained in the fiber layer was approximately the same as the particle diameter of the inorganic binder particles at the time of slurry preparation, and was confirmed to be 10 ⁇ m or less. It was confirmed that a large number of inorganic binder particles were uniformly supported on the surface of each inorganic fiber. It was confirmed that some inorganic binder particles were partially fixed to inorganic fibers.
  • the fiber layers of the honeycomb structures of Comparative Examples 1 to 3 before the thermal shock test were observed in the same manner as in the examples.
  • the particle diameter of the inorganic binder particles contained in the fiber layer was approximately the same as the particle diameter of the inorganic binder particles at the time of slurry preparation, and it was confirmed that the particle diameter exceeded 10 ⁇ m. Further, in any of the comparative examples, it was confirmed that the inorganic binder particles were supported nonuniformly on the inorganic fibers.
  • honeycomb structure and the honeycomb filter according to the present invention can be used for purifying exhaust gas discharged from an internal combustion engine of an automobile, for example.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Ceramic Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Structural Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Materials Engineering (AREA)
  • Biomedical Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Filtering Materials (AREA)
  • Processes For Solid Components From Exhaust (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Porous Artificial Stone Or Porous Ceramic Products (AREA)
  • Catalysts (AREA)

Abstract

L'invention porte sur une structure en nid-d'abeilles, à partir de laquelle le détachement d'une couche de fibres peut être empêché. La structure en nid-d'abeilles (100) selon un aspect de la présente invention comprend, formés en son sein, de multiples trous traversants (110a) qui sont séparés par des parois de séparation poreuses (120), au moins une partie d'une paroi interne d'un pore fin (150) formé dans chacune des parois de séparation (120) et/ou au moins une partie de chacune des parois de séparation (120) étant recouvertes d'une couche de fibres (140), la couche de fibres (140) contenant des fibres inorganiques (140a) et des particules de liant inorganique (140b) et le diamètre médian de particule des particules de liant inorganique (140b) étant inférieur ou égal à 10 μm.
PCT/JP2014/068298 2013-09-25 2014-07-09 Structure et filtre en nid-d'abeilles WO2015045559A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2013198748A JP2016196378A (ja) 2013-09-25 2013-09-25 ハニカム構造体及びハニカムフィルタ
JP2013-198748 2013-09-25

Publications (1)

Publication Number Publication Date
WO2015045559A1 true WO2015045559A1 (fr) 2015-04-02

Family

ID=52742717

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2014/068298 WO2015045559A1 (fr) 2013-09-25 2014-07-09 Structure et filtre en nid-d'abeilles

Country Status (2)

Country Link
JP (1) JP2016196378A (fr)
WO (1) WO2015045559A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017160095A (ja) * 2016-03-11 2017-09-14 日本特殊陶業株式会社 多孔体複合部材

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60106514A (ja) * 1983-11-14 1985-06-12 Toyota Motor Corp 微粒子捕集用セラミツクフイルタ
JP2008272664A (ja) * 2007-04-27 2008-11-13 Ngk Insulators Ltd ハニカムフィルタシステム
WO2008136232A1 (fr) * 2007-04-27 2008-11-13 Ngk Insulators, Ltd. Filtre en nid d'abeilles
JP2013144640A (ja) * 2013-03-18 2013-07-25 Tokyo Yogyo Co Ltd ハニカム構造体

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60106514A (ja) * 1983-11-14 1985-06-12 Toyota Motor Corp 微粒子捕集用セラミツクフイルタ
JP2008272664A (ja) * 2007-04-27 2008-11-13 Ngk Insulators Ltd ハニカムフィルタシステム
WO2008136232A1 (fr) * 2007-04-27 2008-11-13 Ngk Insulators, Ltd. Filtre en nid d'abeilles
JP2013144640A (ja) * 2013-03-18 2013-07-25 Tokyo Yogyo Co Ltd ハニカム構造体

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017160095A (ja) * 2016-03-11 2017-09-14 日本特殊陶業株式会社 多孔体複合部材

Also Published As

Publication number Publication date
JP2016196378A (ja) 2016-11-24

Similar Documents

Publication Publication Date Title
JP5150132B2 (ja) ハニカムフィルタシステム
JP5964564B2 (ja) ウォールフロー型排ガス浄化フィルタ
JP4495152B2 (ja) ハニカム構造体及びその製造方法
JP5725265B2 (ja) セラミックハニカム構造体及びその製造方法
WO2013145316A1 (fr) Filtre en nid d'abeilles et procédé de production d'un filtre en nid d'abeilles
JP5764120B2 (ja) ハニカムフィルタ
US20070140928A1 (en) Low pressure drop coated diesel exhaust filter
JP2007296512A (ja) ハニカムフィルタ
JPWO2006041174A1 (ja) セラミックハニカム構造体
JPWO2006070504A1 (ja) フィルタ及びフィルタ集合体
JP6633952B2 (ja) ハニカム構造体
JP5601957B2 (ja) チタン酸アルミニウム質ハニカム構造体
JP2013002391A (ja) 排ガス浄化フィルタ
JP2019177317A (ja) ハニカムフィルタ
JP2007252997A (ja) フィルタ型排ガス浄化用触媒
JP2019177318A (ja) ハニカムフィルタ
EP2108448A2 (fr) Corps de catalyseur en nid d'abeille
CN111818984A (zh) 蜂窝过滤器和蜂窝过滤器的制造方法
JP2019177316A (ja) ハニカムフィルタ
WO2013145318A1 (fr) Filtre en nid d'abeilles et procédé de production d'un filtre en nid d'abeilles
WO2015045559A1 (fr) Structure et filtre en nid-d'abeilles
JP5654733B2 (ja) ハニカム触媒体及びハニカム触媒体の製造方法
JP6542690B2 (ja) フィルタ触媒の製造方法
JP2013044319A (ja) ハニカム構造体およびこれを用いたガス処理装置
WO2013161506A1 (fr) Structure en nid-d'abeilles et filtre en nid-d'abeilles

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 14849206

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 14849206

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP