# US 7,608,559 B2 · Method for producing heat-resisting compound oxides > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,608,559 B2 - Document ID: US7608559B2 - Status: Granted - Kind: B2 - Application number: 11/918,545 - Filed: 2006-04-07 - Published: 2009-01-29 - Granted: 2009-10-27 - Earliest claimed: 2005-04-18 - Assignees: Toyota Jidosha Kabushiki Kaisha - Inventors: Shinichi Takeshima; Akio Koyama - Web page: https://patentgrep.com/patent/US7608559B2 ## CPC - B01J 37/0072: {Preparation of particles, e.g. dispersion of droplets in an oil bath} - B01D 53/945: {characterised by a specific catalyst} - B01J 21/066: {Zirconium or hafnium; Oxides or hydroxides thereof} - B01J 23/10: of rare earths - B01J 23/30: Tungsten - B01J 23/63: with rare earths or actinides - 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 37/0236: {Drying, e.g. preparing a suspension, adding a soluble salt and drying} - B01J 37/03: Precipitation; Co-precipitation - C01G 25/00: Compounds of zirconium - C01G 25/006: {Compounds containing zirconium, with or without oxygen or hydrogen, and containing two or more other elements} - C01G 41/00: Compounds of tungsten - C01P 2006/12: Surface area - 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) - C01G: COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts or peroxyacids C01B15/00; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium, or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds containing nitrogen, other non-metals and metal C01B21/082}; metal amides C01B21/092; nitrites C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; carbides C01B32/90; compounds containing silicon C01B33/00; compounds containing boron C01B35/00; compounds having molecular sieve properties but not having base-exchange properties C01B37/00; compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites, C01B39/00; cyanides C01C3/08; salts of cyanamide C01C3/16; thiocyanates C01C3/20) - C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A method for producing a heat-resisting compound oxide in which oxide particles are made to carry fine particles having a smaller particle diameter than that of said oxide particles. Said oxide particles or their precursor particles are charged to a potential inverse to that of said fine particles or their precursor particles so that said oxide particles adsorb said fine particles, and are then sintered to carry said fine particles. Thus, the fine particles can be homogeneously dispersed and firmly adhered to the surfaces of the oxide particles. As a result, the compound oxide is so excellent in heat resistance that it has little change, even subjected to a treatment such as a sintering, in the structure of the oxide particles for a carrier or in the adsorption state of the ultrafine particles, and has little thermal deterioration. ## Claims ### Claim 1 A method for producing a heat-resisting compound oxide, comprising: synthesizing first oxide particles or their precursor particles in micelles in a microemulsion; charging said first oxide particles or their precursor particles to a potential inverse to that of second oxide particles or their precursor particles, wherein said second oxide particles or their precursor particles have a smaller diameter than said first oxide particles or their precursor particles; absorbing said second oxide particles or their precursor particles onto said first oxide particles or their precursor particles; and sintering said first oxide particles or their precursor particles and said second oxide particles or their precursor particles; wherein the method results in said second oxide particles being carried on said first oxide particles; wherein the obtained surface area is enlarged by the second oxide particles blocking or suppressing the sintering of the first oxide particles. ### Claim 2 (depends on 1) The method for producing a heat-resisting compound oxide as set forth in claim 1, further comprising: mixing a solution containing said second particles or their precursor particles with said microemulsion so that said first oxide particles are caused to adsorb said second particles. ### Claim 3 (depends on 2) The method for producing a heat-resisting compound oxide as set forth in claim 2, wherein: the pH value of an environment in which said first oxide particles or their precursor particles and said second particles or their precursor particles are mixed is adjusted to charge said first oxide particles or their precursor particles and said second particles or their precursor particles to potentials inverse to each other. ### Claim 4 (depends on 2) The method for producing a heat-resisting compound oxide as set forth in claim 2, wherein: either said first oxide particles or their precursor particles, or said second particles or their precursor particles, are caused to adsorb an acid or a base so that said first oxide particles or their precursor particles and said second particles or their precursor particles are charged to potentials inverse to each other. ### Claim 5 (depends on 1) The method for producing a heat-resisting compound oxide as set forth in claim 1, further comprising: synthesizing said second particles or their precursor particles in a reaction field for synthesizing said first oxide particles or their precursor particles; and charging said second particles to a potential inverse to that of said first oxide particles or their precursor particles so that said first oxide particles are caused to adsorb said second particles. ### Claim 6 (depends on 5) The method for producing a heat-resisting compound oxide as set forth in claim 5, wherein: the pH value of environment in which said second particles are synthesized is adjusted to charge said first oxide particles or their precursor particles and said second particles or their precursor particles to potentials inverse to each other. ### Claim 7 (depends on 5) The method for producing a heat-resisting compound oxide as set forth in claim 5, wherein: either said first oxide particles or their precursor particles, or said second particles or their precursor particles, are caused to adsorb an acid or a base so that said first oxide particles or their precursor particles and said second particles or their precursor particles are charged to potentials inverse to each other. ### Claim 8 (depends on 1) The method for producing a heat-resisting compound oxide as set forth in claim 1, wherein: the pH value of either an environment in which said first oxide particles or their precursor particles and said second particles or their precursor particles are mixed, or an environment in which said second particles are synthesized, is adjusted to charge said first oxide particles or their precursor particles and said second particles or their precursor particles to potentials inverse to each other. ### Claim 9 (depends on 1) The method for producing a heat-resisting compound oxide as set forth in claim 1, wherein: either said first oxide particles or their precursor particles, or said second particles or their precursor particles, are caused to adsorb an acid or a base so that said first oxide particles or their precursor particles and said second particles or their precursor particles are charged to potentials inverse to each other.