US20160102591A1 - Catalytic converter - Google Patents

Catalytic converter Download PDF

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Publication number
US20160102591A1
US20160102591A1 US14/786,341 US201414786341A US2016102591A1 US 20160102591 A1 US20160102591 A1 US 20160102591A1 US 201414786341 A US201414786341 A US 201414786341A US 2016102591 A1 US2016102591 A1 US 2016102591A1
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US
United States
Prior art keywords
substrate
downstream
exhaust duct
catalytic converter
center region
Prior art date
Legal status (The legal status 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 status listed.)
Abandoned
Application number
US14/786,341
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English (en)
Inventor
Ryosuke Kayanuma
Takahiko Fujiwara
Yuki Aoki
Hiroyuki Matsubara
Naohiro Hayashi
Yuji Yabuzaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Motor Corp
Original Assignee
Toyota Motor Corp
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 Toyota Motor Corp filed Critical Toyota Motor Corp
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA reassignment TOYOTA JIDOSHA KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: AOKI, YUKI, YABUZAKI, YUJI, HAYASHI, NAOHIRO, MATSUBARA, HIROYUKI, FUJIWARA, TAKAHIKO, KAYANUMA, Ryosuke
Publication of US20160102591A1 publication Critical patent/US20160102591A1/en
Abandoned legal-status Critical Current

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Classifications

    • 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
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • 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
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • 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
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • 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
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
    • 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
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/06—Exhaust treating devices having provisions not otherwise provided for for improving exhaust evacuation or circulation, or reducing back-pressure
    • 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
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/14—Exhaust treating devices having provisions not otherwise provided for for modifying or adapting flow area or back-pressure
    • 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
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/30—Honeycomb supports characterised by their structural details
    • F01N2330/48—Honeycomb supports characterised by their structural details characterised by the number of flow passages, e.g. cell density
    • 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
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/60—Discontinuous, uneven properties of filter material, e.g. different material thickness along the longitudinal direction; Higher filter capacity upstream than downstream in same housing
    • 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
    • F01N2340/00—Dimensional characteristics of the exhaust system, e.g. length, diameter or volume of the apparatus; Spatial arrangements of exhaust apparatuses

Definitions

  • the invention relates to a catalytic converter that forms an exhaust system for exhaust gas.
  • a catalytic converter for purifying exhaust gas is typically arranged in an exhaust system for exhaust gas that connects a vehicle engine to a muffler.
  • the engine discharges toxic substances such as unburned HC and VOC.
  • a catalyst layer formed by a precious metal catalyst such as palladium or platinum is formed on a cell wall surface of a substrate that includes multiple cells. More specifically, a catalyst layer is formed in the length direction of the substrate, i.e., along a direction in which the exhaust gas flows, on the cell wall surface of the multiple cells.
  • the cell density of the substrate is uniform with a substrate provided with cells having a honeycomb structure, for example. Because a flow rate distribution of the exhaust gas in a sectional center region of the substrate is higher than it is in a sectional peripheral region, the catalyst layer of the entire substrate is unable to be sufficiently utilized.
  • the relationship between the catalytic converter and an exhaust duct on the downstream side where purified exhaust gas flows out from this catalytic converter is also extremely important in improving the exhaust gas conversion efficiency of the entire catalytic converter and reducing pressure loss. It is necessary to comprehensively design a catalytic converter, including the exhaust duct on the downstream side of the catalytic converter.
  • JP 2008-18370 A focuses on the relationship between a catalytic converter and an exhaust duct on the upstream side, and describes a ceramic catalyst body in which an aperture ratio of a substrate portion corresponding to a projection portion with respect to the substrate of the exhaust duct on the upstream side is smaller than the aperture ratio of a substrate portion corresponding to a portion to the outside of this projection portion.
  • the ceramic catalyst body described in JP 2008-18370 A focuses on the relationship between the exhaust duct on the upstream side of the catalytic converter and the cell density of the substrate that forms the catalytic converter.
  • the exhaust gas purification performance is also able to be increased by this ceramic catalyst body
  • the inventors have discovered that the relationship between the substrate that forms the catalytic converter and the exhaust duct on the downstream side of this catalytic converter is even more important to the exhaust gas purification performance than the relationship between the exhaust duct on the upstream side of the catalytic converter and the substrate that forms this catalytic converter is.
  • the invention thus provides a catalytic converter having excellent exhaust gas purification performance, by specifying a relationship between a substrate that forms the catalytic converter and an exhaust duct on a downstream side of the catalytic converter.
  • the catalytic converter according to the invention includes an outer tube that is connected to an exhaust duct through which exhaust gas flows.
  • This outer tube includes a cylindrical portion, an upstream-side cone portion that extends from one end of the cylindrical portion in such a manner that a cross-section thereof becomes smaller in diameter, and that is connected to the exhaust duct on an upstream side with respect to an exhaust gas flow, and a downstream-side cone portion that extends from the other end of the cylindrical portion in such a manner that a cross-section thereof becomes smaller in diameter, and that is connected to the exhaust duct on a downstream side with respect to the exhaust gas flow.
  • the catalytic converter also includes a substrate having a cell structure that is arranged inside of the cylindrical portion of the outer tube.
  • a catalyst layer in which a precious metal catalyst is carried on a carrier is formed on a cell wall surface of the substrate.
  • the substrate is configured such that a cell density at a center region is different than a cell density at a peripheral region, in a cross-section that is orthogonal to a length direction of the substrate, the cell density of the center region being higher than the cell density of the peripheral region.
  • the substrate is such that a projection portion when a cross-section of a connecting portion of the exhaust duct and the downstream-side cone portion is projected onto the substrate falls within the center region.
  • the catalytic converter of the invention includes a substrate with a catalyst layer having a cell structure arranged in a hollow interior of a metal outer tube formed by a cylindrical portion that is between an upstream-side cone portion at one end and a downstream-side cone portion at the other end, both of which become smaller in diameter toward the outside.
  • a projection portion formed when the connecting portion of the exhaust duct on the downstream side and the downstream-side cone portion of the outer tube in which the sectional area is smaller than that of the substrate is projected onto the substrate may fall within the center region.
  • the purified exhaust gas that flows out on the downstream side from the catalytic converter passes through the downstream-side cone portion of the outer tube and out into the exhaust duct on the downstream side. Therefore, even if an attempt is made to equalize the flow rate distribution of the entire cross-section by making the cell density in the center region different from that in the peripheral region in a cross-section of the substrate, the flow rate of the exhaust gas at a substrate portion corresponding to the projection portion when the cross-section of the exhaust duct on the downstream side where the exhaust gas flows out is projected onto the substrate is actually faster than it is at another substrate portion.
  • this projection portion inside the center region (i.e., the region where the cell density is high) of the substrate, the exhaust gas is able to be made to effectively flow through the center region where the cell density is high and the catalyst quantity is large, so purification of this exhaust gas is able to be promoted. As a result, the exhaust gas purification performance of the overall catalytic converter is able to be improved.
  • the substrate having the cell structure may be made of ceramic material such as cordierite or silicon carbine.
  • a so-called honeycomb structure that includes multiple cells with lattice profiles that are square, hexagonal, or octagonal or the like, may be applied to the substrate having the cell structure.
  • a porous oxide is one possible example of the carrier that forms the catalyst layer that is formed on the cell wall surface of the substrate.
  • a catalyst layer in which one or two or more types of precious metal catalysts such as rhodium, palladium, and platinum are carried on this carrier may be formed.
  • the catalytic converter of the invention has a cordierite honeycomb carrier having excellent thermal shock resistance, but it may alternatively be an electrically heated catalytic converter (EHC: electrically heated converter).
  • EHC electrically heated catalytic converter
  • This electrically heated catalytic converter is provided with a pair of electrodes that are attached to a honeycomb catalyst, for example.
  • the honeycomb catalyst is heated by energizing the electrodes, which in turn increases the activity of the honeycomb catalyst, such that the exhaust gas that passes through this is purified.
  • the catalyst can be activated by electric heating, thus enabling the exhaust gas to be purified when it is cold, in addition to purifying exhaust gas at normal temperature.
  • exhaust gas purification is able to be promoted, thus enabling the exhaust gas purification performance of the entire catalytic converter to be improved, by passing exhaust gas having a high flow rate through a center region where the cell density is high and the catalyst quantity is large, while effectively utilizing the catalyst in the peripheral region of the substrate to purify exhaust gas.
  • FIG. 1 is a view showing a frame format of one example embodiment of a catalytic converter according to the invention, together with exhaust ducts on an upstream side and a downstream side;
  • FIG. 2 is a perspective view of a substrate that forms the catalytic converter
  • FIG. 3A is a view from a Y direction in FIG. 1 , of a connecting portion of an exhaust duct on a downstream side and a downstream-side cone portion projected onto a cross-section of the substrate;
  • FIG. 3B is a view of another example embodiment of the projection view in FIG. 3A ;
  • FIG. 3C is a view of yet another example embodiment of the projection view in FIG. 3A ;
  • FIG. 4 is a view showing analysis results related to a pressure loss ratio when the number of substrate cells and the diameter of the downstream-side exhaust duct are changed;
  • FIG. 5 is a view of test results identifying a relationship between a difference in a diameter d 2 of a center region of the substrate and a diameter d 3 of the connecting portion, and the pressure loss in the catalytic converter;
  • FIG. 6 is a view of test results identifying a relationship between the difference in the diameter d 2 of the center region of the substrate and the diameter d 3 of the connecting portion, and a NOx purification amount of the catalytic converter;
  • FIG. 7 is a view of test results identifying a relationship between the difference in the diameter d 2 of the center region of the substrate and the diameter d 3 of the connecting portion, and a ratio of the NOx purification amount to the pressure loss (i.e., NO purification amount/pressure loss).
  • FIG. 1 is a view showing a frame format of one example embodiment of the catalytic converter according to the invention, together with exhaust ducts on an upstream side and a downstream side.
  • FIG. 2 is a perspective view of a substrate that forms the catalytic converter.
  • FIG. 3A is a view from a Y direction in FIG. 1 , of a connecting portion of a downstream-side cone portion and the downstream-side exhaust duct projected on a cross-section of the substrate
  • the exhaust system for exhaust gas to which the catalytic converter of the invention is applied includes an engine, a catalytic converter, a three-way catalytic converter, a sub muffler, and a main muffler, all of which are connected together by an exhaust duct. Exhaust gas produced by the engine flows through each portion via the exhaust duct, so as to be discharged.
  • FIG. 1 An illustration of an exhaust system for exhaust gas, in which a catalytic converter 10 of the invention is interposed will be described.
  • the catalytic converter 10 an exhaust duct 3 on an upstream side of the catalytic converter 10 (hereinafter also referred to as the “upstream-side exhaust duct 3 ”), and an exhaust duct 4 on a downstream side of the catalytic converter 10 (hereinafter also referred to as the “downstream-side exhaust duct 4 ”)are shown.
  • upstream-side exhaust duct 3 an exhaust duct 3 on an upstream side of the catalytic converter 10
  • the downstream-side exhaust duct 4 an exhaust duct 4 on a downstream side of the catalytic converter 10
  • the catalytic converter 10 includes a metal outer tube 1 , and a substrate 2 arranged inside the outer tube 1 .
  • the outer tube 1 is formed, for example, by a cylindrical portion 1 a having a uniform cross-section, an upstream-side cone portion 1 b that extends from one end of the cylindrical portion 1 a such that the cross-section narrows in diameter, and that connects the exhaust duct 3 on the upstream side with respect to the exhaust gas flow, and a downstream-side cone portion 1 c that extends from the other end of the cylindrical portion 1 a such that the cross-section narrows in diameter, and that connects the exhaust duct 3 on the downstream side with respect to the exhaust gas flow.
  • the substrate 2 arranged inside the outer tube 1 is formed by a cylindrical member having multiple cells, with a catalyst layer, not shown, formed on a cell wall surface.
  • Possible examples of material used to form the substrate 2 include ceramic material such as silicon carbine or cordierite made of a composite oxide of silicon dioxide, aluminum oxide, and magnesium oxide, and material other than ceramic material such as metal material.
  • a possible example of a carrier that forms the catalyst layer formed on the cell wall surface of the substrate 2 is an oxide having at least one of CeO 2 , ZrO 2 , and Al 2 O 3 as the main component, which is a porous oxide.
  • Possible examples include an oxide formed from one of ceria (CeO 2 ), zirconia (ZrO 2 ), and alumina (Al 2 O 3 ), and a composite oxide formed from two or more of these (i.e., ceria (CeO 2 ), zirconia (ZrO 2 ), and alumina (Al 2 O 3 )) (a so-called CeO 2 —ZrO 2 compound that is CZ material, or an Al 2 O 3 —CeO 2 —ZrO 2 ternary composite oxide (ACZ material) into which Al 2 O 3 has been introduced as a diffusion barrier).
  • the entire catalyst layer is formed by one or two or more of Pd, Pt, and Rh that are precious metal catalysts being carried on these carriers
  • the substrate 2 is formed by a honeycomb structure that includes multiple cells with lattice profiles that are square, hexagonal, or octagonal or the like, such that exhaust gas flows through the inside of each of the cells (in direction X 1 ).
  • the substrate 2 is has two regions, i.e., a center region 2 a where the cell density is relatively high, and a peripheral region 2 b where the cell density is relatively low.
  • the catalytic converter 10 illustrated has a relationship of d 1 >d 2 ⁇ d 3 . Further, the catalytic converter 10 and the downstream-side exhaust duct 4 are formed such that a projection portion formed by projecting the connecting portion 5 onto a cross-section of the substrate 2 is within the center region 2 a, as shown in FIG. 3A .
  • the mode in which the projection portion formed by projecting the connecting portion 5 onto a cross-section of the substrate 2 exists in the center region 2 a includes both a mode in which a true circle cross section of the connecting portion 5 and a true circle cross section of the center region 2 a have the same circle center as shown in FIG. 3 A, a mode in which the circle centers of both of the true circle cross sections are offset from one another as shown in FIG. 3B .
  • a substrate 2 A having an oblong sectional shape is applied as shown in FIG.
  • the true circle cross section of the connecting portion 5 is in the center region 2 a ′ having this oblong shape.
  • the structure of the invention is satisfied as long as the projection portion of the connecting portion is in the center region of the substrate.
  • Thermo-fluid analysis (software: STAR-CD by IDAJ Co., LTD.) was used in the analysis.
  • the downstream-side exhaust duct diameter was set to 55 mm as a condition when analyzing the relationship between the number of substrate cells and the pressure loss ratio. Meanwhile, the number of substrate cells was set to 600 as a condition when analyzing the relationship between the downstream-side exhaust duct diameter and the pressure loss ratio. The analysis results are shown in FIG. 4 .
  • the cross-section diameter of the downstream-side exhaust duct that is connected to the outer tube that forms the catalytic converter has a greater effect than the constituent elements that directly make up the catalytic converter.
  • the relationship between the constituent elements of the catalytic converter and the downstream-side exhaust duct is specified based on this verification result.
  • the cell density in the center region 2 a is made different from the cell density in the peripheral region 2 b in the substrate 2 in an attempt to equalize the flow rate distribution of the entire cross-section.
  • the flow rate of the exhaust gas at a substrate portion corresponding to a projection portion when a cross section of the downstream-side exhaust duct 4 where the exhaust gas flows out is projected onto the substrate 2 is actually faster than it is at another substrate portion. Therefore, by providing this projection portion in the center region 2 a of the substrate 2 as shown in FIG.
  • the exhaust gas can be made to effectively flow through the center region 2 a where the cell density is high and there are a large amount catalysts, so purification can be promoted. As a result, the exhaust gas purification performance of the overall catalytic converter 10 is able to be improved.
  • the inventors conducted a test to identify the relationship between the difference in the diameter d 2 of the center region of the substrate and the diameter d 3 of the connecting portion of the downstream-side exhaust duct and the downstream-side cone portion, and the pressure loss of the catalytic converter, the relationship between that difference and the NOx purification amount of the catalytic converter, the relationship between that difference and the NOx purification amount/the pressure loss.
  • the ratio of the area of the center region to the total sectional area of the substrate was 25%.
  • the intake air amount Ga was 100 g/s.
  • the intake air amount Ga was 20 g/s.
  • FIGS. 5 to 7 The test results are shown in FIGS. 5 to 7 .
  • FIG. 5 is a view of test results related to the pressure loss.
  • FIG. 6 is a view of test results related to the NOx purification amount.
  • FIG. 7 is a view of test results related to the NO purification amount/the pressure loss).
  • an approximate curve is created based on the plotted test results.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Catalysts (AREA)
US14/786,341 2013-04-26 2014-04-23 Catalytic converter Abandoned US20160102591A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2013094303A JP2014213289A (ja) 2013-04-26 2013-04-26 触媒コンバーター
JP2013-094303 2013-04-26
PCT/IB2014/000596 WO2014174357A1 (en) 2013-04-26 2014-04-23 Catalytic converter

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US20160102591A1 true US20160102591A1 (en) 2016-04-14

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US14/786,341 Abandoned US20160102591A1 (en) 2013-04-26 2014-04-23 Catalytic converter

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US (1) US20160102591A1 (zh)
JP (1) JP2014213289A (zh)
CN (1) CN105143629A (zh)
DE (1) DE112014002159T8 (zh)
WO (1) WO2014174357A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10598068B2 (en) 2015-12-21 2020-03-24 Emissol, Llc Catalytic converters having non-linear flow channels

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5904193B2 (ja) 2013-11-15 2016-04-13 株式会社デンソー ハニカム構造体の製造方法
JP5958567B2 (ja) 2014-03-05 2016-08-02 株式会社デンソー ハニカム構造体
WO2017154529A1 (ja) * 2016-03-08 2017-09-14 学校法人早稲田大学 繊維状炭素ナノ構造体製造装置及び繊維状炭素ナノ構造体製造方法
JP6615667B2 (ja) * 2016-03-28 2019-12-04 日本碍子株式会社 排ガス処理装置
JP7035780B2 (ja) * 2018-05-08 2022-03-15 トヨタ自動車株式会社 触媒構造体

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002177794A (ja) * 2000-09-29 2002-06-25 Denso Corp セラミック触媒体およびセラミック担体
JP4969865B2 (ja) * 2006-02-15 2012-07-04 新日本製鐵株式会社 排気ガス浄化装置
JP2008018370A (ja) * 2006-07-14 2008-01-31 Denso Corp セラミック触媒体
DE102007036254A1 (de) * 2007-08-02 2009-02-05 Robert Bosch Gmbh Abgasanlage einer Brennkraftmaschine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10598068B2 (en) 2015-12-21 2020-03-24 Emissol, Llc Catalytic converters having non-linear flow channels
US10815856B2 (en) 2015-12-21 2020-10-27 Mansour Masoudi Catalytic converters having non-linear flow channels

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Publication number Publication date
WO2014174357A8 (en) 2014-12-24
WO2014174357A1 (en) 2014-10-30
DE112014002159T8 (de) 2016-05-12
CN105143629A (zh) 2015-12-09
JP2014213289A (ja) 2014-11-17
DE112014002159T5 (de) 2016-01-07

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Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KAYANUMA, RYOSUKE;FUJIWARA, TAKAHIKO;AOKI, YUKI;AND OTHERS;SIGNING DATES FROM 20150910 TO 20151015;REEL/FRAME:036858/0510

STCB Information on status: application discontinuation

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