# US 11,298,687 B2 · Honeycomb catalytic converter > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,298,687 B2 - Document ID: US11298687B2 - Status: Granted - Kind: B2 - Application number: 16/830,278 - Filed: 2020-03-26 - Published: 2020-07-16 - Granted: 2022-04-12 - Earliest claimed: 2017-09-27 - Assignees: Ibiden Co., Ltd.; Toyota Jidosha Kabushiki Kaisha - Applicants: Ibiden Co., Ltd.; Toyota Jidosha Kabushiki Kaisha - Inventors: Shinnosuke Goto; Takumi Tojo; Takeru Yoshida; Hiromasa Suzuki - Web page: https://patentgrep.com/patent/US11298687B2 ## CPC - B01J 23/44: Palladium - B01J 23/63: with rare earths or actinides - B01D 53/94: by catalytic processes - B01D 53/9454: {characterised by a specific device} - B01J 23/002: {Mixed oxides other than spinels, e.g. perovskite} - B01J 23/464: {Rhodium} - B01J 35/57: Honeycombs - B01J 37/0018: {Addition of a binding agent or of material, later completely removed among others as result of heat treatment, leaching or washing,(e.g. forming of pores; protective layer, desintegrating by heat)} - B01J 37/0225: {of metal substrates} - B01J 37/0236: {Drying, e.g. preparing a suspension, adding a soluble salt and drying} - B01J 37/08: Heat treatment {(B01J37/0009, B01J37/0018 take precedence)} - F01N 3/101: {Three-way catalysts} - F01N 3/2803: {characterised by structure, by material or by manufacturing of catalyst support} - F01N 3/2828: {Ceramic multi-channel monoliths, e.g. honeycombs} - B01D 2255/1023: Palladium - B01D 2255/1025: Rhodium - B01D 2255/407: Zr-Ce mixed oxides - B01D 2258/014: Stoichiometric gasoline engines - B01J 2523/31: Aluminium - B01J 2523/3712: Cerium - B01J 2523/48: Zirconium - F01N 2330/02: Metallic plates or honeycombs, e.g. superposed or rolled-up corrugated or otherwise deformed sheet metal - F01N 2330/06: Ceramic, e.g. monoliths - F01N 2370/02: used in catalytic reactors - F01N 2510/06: for exhaust purification, e.g. catalytic reaction - F01N 2510/0682: having a discontinuous, uneven or partially overlapping coating of catalytic material, e.g. higher amount of material upstream than downstream or vice versa - Y02T 10/12: Improving ICE efficiencies - B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS - B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28) - F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract The present invention relates to a honeycomb catalytic converter including: a honeycomb structured body in which multiple through-holes are arranged longitudinally in parallel with one another with a partition wall therebetween; a noble metal supported on the honeycomb structured body; and an inlet-side end face and on outlet-side end face, wherein each partition wall includes a substrate portion in the form of an extrudate containing a ceria-zirconia complex oxide and alumina, and a coat layer formed on a surface of the substrate portion and containing the noble metal, and the inlet-side end face has a higher aperture ratio than the outlet-side end face. ## Claims ### Claim 1 A honeycomb catalytic converter comprising: a honeycomb structured body in which multiple through-holes are arranged longitudinally in parallel with one another with a partition wall therebetween; a noble metal supported on the honeycomb structured body; and an inlet-side end face and on outlet-side end face, wherein each partition wall includes a substrate portion in the form of an extrudate containing a ceria-zirconia complex oxide and alumina, and a coat layer formed on a surface of the substrate portion and containing the noble metal, an aperture ratio of the inlet-side end face is higher than an aperture ratio the outlet-side end face, and wherein the inlet-side end face has an aperture ratio of 70 to 90%, and the outlet-side end face has an aperture ratio of 65 to 85%. ### Claim 2 (depends on 1) The honeycomb catalytic converter according to claim 1, wherein a thickness of the coat layer on the outlet-side end face is thicker than the thickness of the coat layer on the inlet-side end face. ### Claim 3 (depends on 2) The honeycomb catalytic converter according to claim 2, wherein the thickness of the coat layer successively increases from the inlet-side end face toward the outlet-side end face. ### Claim 4 (depends on 2) The honeycomb catalytic converter according to claim 2, wherein the substrate portion further contains an inorganic binder. ### Claim 5 (depends on 2) The honeycomb catalytic converter according to claim 2, wherein the honeycomb catalytic converter has a length to diameter ratio (length/diameter) of 0.5 to 1.1. ### Claim 6 (depends on 2) The honeycomb catalytic converter according to claim 2, wherein the honeycomb catalytic converter has a diameter of 130 mm or less. ### Claim 7 (depends on 2) The honeycomb catalytic converter according to claim 2, wherein the honeycomb catalytic converter contains 25 to 75 wt % ceria-zirconia complex oxide. ### Claim 8 (depends on 1) The honeycomb catalytic converter according to claim 1, wherein the thickness of the coat layer successively increases from the inlet-side end face toward the outlet-side end face. ### Claim 9 (depends on 8) The honeycomb catalytic converter according to claim 8, wherein the substrate portion further contains an inorganic binder. ### Claim 10 (depends on 8) The honeycomb catalytic converter according to claim 8, wherein the honeycomb catalytic converter has a length to diameter ratio (length/diameter) of 0.5 to 1.1. ### Claim 11 (depends on 8) The honeycomb catalytic converter according to claim 8, wherein the honeycomb catalytic converter has a diameter of 130 mm or less. ### Claim 12 (depends on 8) The honeycomb catalytic converter according to claim 8, wherein the honeycomb catalytic converter contains 25 to 75 wt % ceria-zirconia complex oxide. ### Claim 13 (depends on 1) The honeycomb catalytic converter according to claim 1, wherein the substrate portion further contains an inorganic binder. ### Claim 14 (depends on 1) The honeycomb catalytic converter according to claim 1, wherein the honeycomb catalytic converter contains 25 to 75 wt % ceria-zirconia complex oxide. ### Claim 15 A honeycomb catalytic converter comprising: a honeycomb structured body in which multiple through-holes are arranged longitudinally in parallel with one another with a partition wall therebetween; a noble metal supported on the honeycomb structured body; and an inlet-side end face and on outlet-side end face, wherein each partition wall includes a substrate portion in the form of an extrudate containing a ceria-zirconia complex oxide and alumina, and a coat layer formed on a surface of the substrate portion and containing the noble metal, an aperture ratio of the inlet-side end face is higher than an aperture ratio the outlet-side end face, and wherein the honeycomb catalytic converter has a length to diameter ratio (length/diameter) of 0.5 to 1.1. ### Claim 16 (depends on 15) The honeycomb catalytic converter according to claim 15, wherein the inlet-side end face has an aperture ratio of 70 to 90%, and the outlet-side end face has an aperture ratio of 65 to 85%. ### Claim 17 A honeycomb catalytic converter comprising: a honeycomb structured body in which multiple through-holes are arranged longitudinally in parallel with one another with a partition wall therebetween; a noble metal supported on the honeycomb structured body; and an inlet-side end face and on outlet-side end face, wherein each partition wall includes a substrate portion in the form of an extrudate containing a ceria-zirconia complex oxide and alumina, and a coat layer formed on a surface of the substrate portion and containing the noble metal, an aperture ratio of the inlet-side end face is higher than an aperture ratio the outlet-side end face, and wherein the honeycomb catalytic converter has a diameter of 130 mm or less. ### Claim 18 (depends on 17) The honeycomb catalytic converter according to claim 17, wherein the inlet-side end face has an aperture ratio of 70 to 90%, and the outlet-side end face has an aperture ratio of 65 to 85%.