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1. 发明专利

JP2000288391A CATALYST CARRIER AND CATALYST FOR CLEANING EXHAUST GAS 失效
公开(公告)号：JP2000288391A
公开(公告)日：2000-10-17
申请号：JP9585799
申请日：1999-04-02
申请人： TOYOTA CENTRAL RES & DEV , TOYOTA MOTOR CORP
发明人： KANAZAWA TAKAAKI , HIRAYAMA HIROSHI , SUZUKI SHIGEHARU , SUZUKI TADASHI , SOFUGAWA HIDEO , MORIKAWA AKIRA
IPC分类号： B01D53/94 , B01J23/10 , B01J23/63 , B01J32/00 , F01N3/08 , F01N3/10 , F01N3/28
摘要： PROBLEM TO BE SOLVED: To improve the durability of OSC with the use of a compound oxide carrier and to suppress the peeling of a coat layer and the decrease of a specific surface area during a durability test. SOLUTION: The catalyst carrier comprises a mixture of a compound oxide which contains Al, Ce, and Zr and is prepared from salt solutions by a coprecipitation method and a heat resistant inorganic oxide, and the complex oxide and the inorganic oxide are mixed in a weight ratio of 5:3-2:3. By mixing the inorganic oxide, adhesion to a honeycomb base material is improved so that the peeling of a coat layer during a durability test can be suppressed.

2. 发明专利

JPH06320013A CATALYST CARRIER AND ITS PRODUCTION 失效
公开(公告)号：JPH06320013A
公开(公告)日：1994-11-22
申请号：JP13405393
申请日：1993-05-11
申请人： TOYOTA CENTRAL RES & DEV , TOYOTA MOTOR CORP
发明人： DOI HARUO , INAGAKI SHINJI , FUKUSHIMA YOSHIAKI , FUKUMOTO KAZUHIRO , ONODA SEIJI , SUGIURA MASAHIRO , NAGAMI TETSUO , HIRAYAMA HIROSHI
IPC分类号： B01D53/86 , B01J21/16 , B01J35/04 , B01J35/10 , B01J37/12 , B01D53/36
摘要： PURPOSE:To produce a catalyst carrier having a large specific surface area and excellent in heat resistance. CONSTITUTION:The surface of a porous material having many pores 92 is coated with a metal oxide 1 to obtain the objective catalyst carrier 10. The porous material is a laminar silica porous body or a laminar silica-metal oxide porous body. The laminar silica porous body 9 has a structure formed by bending laminar sheets 91 each consisting of tetrahedrons of SiO4 and partially bonding the upper and lower sheets 91 and has many pores 92 between the layers. The metal oxide 1 is alumina, titania, zirconia, tin oxide, niobium oxide or boron oxide.

3. 发明专利

JPH10328566A CATALYST FOR PURIFYING WASTE GAS 失效
公开(公告)号：JPH10328566A
公开(公告)日：1998-12-15
申请号：JP8586598
申请日：1998-03-31
申请人： TOYOTA MOTOR CORP , TOYOTA CENTRAL RES & DEV
发明人： HIRAYAMA HIROSHI , FUKUI MASAYUKI , SOFUGAWA HIDEO
IPC分类号： B01D53/94 , B01J23/46 , B01J23/63 , B01J32/00 , B01J37/02
摘要： PROBLEM TO BE SOLVED: To obtain a catalyst for purifying catalyst suppressed in the degradation of catalytic purifying performance due to the reaction of Rh with alumina even at a high temp. atmosphere of >=900 deg.C and improved in heat resistance. SOLUTION: The catalyst for purifying waste gas has a carrier base material, a 1st coated layer 2 carrying at least one kind of Pt and Pd on the surface of the base material and a 2nd coated layer 3 formed on the surface of the 1st coated layer and carrying Rh and the 2nd coated layer 3 consists essentially of θ-alumina having 50-100 m /g specific surface area. The θ-alumina is stable against a temp of 900-1000 deg.C, Rh hardly forms a solid solution in the alumina crystal and the sintering of Rh in accordance with the phase change or the grain growth of alumina is suppressed.

4. 发明专利

JPH08281071A WASTE GAS PURIFYING METHOD AND WASTE GAS PURIFYING CATALYST 失效
公开(公告)号：JPH08281071A
公开(公告)日：1996-10-29
申请号：JP9264595
申请日：1995-04-18
申请人： TOYOTA CENTRAL RES & DEV , TOYOTA MOTOR CORP
发明人： TANABE TOSHITAKA , SHINJO HIROBUMI , HIRAYAMA HIROSHI
IPC分类号： F01N3/28 , B01D53/86 , B01D53/94 , B01J23/44 , B01J23/68
摘要： PURPOSE: To maintain the performance of a ternary catalyst close to stoichiometry almost equal to that of the conventional one without using expensive Pt or Rh and to improve the NOx purifying performance in the lean region close to stoichiometry. CONSTITUTION: A waste gas is first brought into contact with a first catalyst 1 carrying Pd and Mo and then with a second catalyst 2 carrying Pd. NOx is efficiently reduced and purified by the first catalyst 1, and the remaining HC and CO are efficiently oxidized and purified by the second catalyst 2.

5. 发明专利

JPH08294624A CATALYST FOR PURIFYING EXHAUST GAS 失效
公开(公告)号：JPH08294624A
公开(公告)日：1996-11-12
申请号：JP10217895
申请日：1995-04-26
申请人： TOYOTA CENTRAL RES & DEV , TOYOTA MOTOR CORP
发明人： TANABE TOSHITAKA , SHINJO HIROBUMI , HIRAYAMA HIROSHI
IPC分类号： B01D53/86 , B01D53/94 , B01J23/46
摘要： PURPOSE: To maintain the performance of a three way catalyst near a stoichiometric region as in the care of conventional one without using expensive Pt and Rh and to improve NOx purification performance in a lean region near the stoichiometric region. CONSTITUTION: A catalyst is composed of a porous carrier and Pd and Ir which are supported by the carrier, and Pd and Ir are in the form of alloy, respectively. Since Ir is oxidized preferentially to Pd in a lean region, the oxidation of Pd is controlled at an atomic level so that the catalytic activity of Pd can be fully utilized.

6. 发明专利

JPH09155192A EXHAUST GAS PURIFYING CATALYST 失效
公开(公告)号：JPH09155192A
公开(公告)日：1997-06-17
申请号：JP31941395
申请日：1995-12-07
申请人： TOYOTA CENTRAL RES & DEV
发明人： SUDA AKIHIKO , SOFUGAWA HIDEO , SUZUKI TADASHI , KAMITORI TOSHIO , UKIYOU YOSHIO , SUGIURA MASAHIRO , KIMURA MAREO , HIRAYAMA HIROSHI , IKEDA YASUO
IPC分类号： B01D53/94 , B01J21/16 , B01J23/63 , C01F17/00
摘要： PROBLEM TO BE SOLVED: To provide excellent purifying capacity capable of being fitted to the prescription of exhaust gas further severe in recent years and in the future by using a ceria/zirconia solid soln. large in OSC and having a sufficiently high oxygen occluding/discharge speed. SOLUTION: In an exhaust gas purifying catalyst obtained by making a noble metal being a catalytic component and a cocatalyst supported with a carrier, the cocatalyst is particles of a mutual solid soln. of ceria and zirconia and the solid soln. degree of zirconia to ceria in particles is 50% or more and the average particle size of crystals constituting the particles is set to 100nm or less.

7. 发明专利

JP2000015101A CATALYST FOR PURIFYING EXHAUST GAS 失效
公开(公告)号：JP2000015101A
公开(公告)日：2000-01-18
申请号：JP18464898
申请日：1998-06-30
申请人： TOYOTA MOTOR CORP , CATALER KK
发明人： IKEDA YASUO , HIRAYAMA HIROSHI , HAYASHI KIYOTAKA , MURATA KATSUYUKI
IPC分类号： B01D53/56 , B01D53/81 , B01D53/94 , B01J23/58 , B01J35/04
摘要： PROBLEM TO BE SOLVED: To suppress the sulfur poisoning of an NOx occluding material and to improve NOx purifying efficiency by forming a coated layer consisting of a porous oxide carrier carrying the NOx occluding material and a noble metal on the surface of a honeycomb shaped carrier base material and also forming another coated layer consisting of Rh/ZrO2. SOLUTION: The coated layer 2 consisting of the porous oxide carrier carrying respectively the NOx occluding material consisting of at least one kind selected among an alkali metal, an alkaline earth metal and a rare earth element and the noble metal is formed on the whole surface of a monolithic base material 1 formed in a form of the honeycomb. Then, another coated layer 3 consisting of Rh/ZrO2 carrying the rhodium on the zirconia is formed on the surface of the coated layer 2 within a prescribed range (for example 3.2% of total length) from an influent gas side end surface 10 of the monolithic base material 1. At this time, the coated layer 2 is formed mainly, for example, with Al2O3 powder and TiO2 powder and carries CeO2-ZrO2 composite oxide powder, Pt, Ba, K and Li.

8. 发明专利

JPH08332350A CATALYST FOR EXHAUST GAS PURIFICATION 失效
公开(公告)号：JPH08332350A
公开(公告)日：1996-12-17
申请号：JP14082995
申请日：1995-06-07
申请人： TOYOTA MOTOR CORP
发明人： HIRAYAMA HIROSHI , SUZUKI SHIGEHARU , ISHIBASHI KAZUNOBU
IPC分类号： B01D53/86 , B01D53/94 , B01J23/46
摘要： PURPOSE: To improve the activity at a low temperature and the durability of an exhaust gas purifying catalyst at a high temperature by depositing palladium at a specified high density in an upper stream side of a carrier. CONSTITUTION: A catalytic converter 1 is composed of a monolithic catalyst 2, an outer cylinder 10 to house the monolithic catalyst 2, and a pair of cones 11, 12 extended from the outer cylinder 10 in a conical shape. Platinum and rhodium are deposited in the whole length of the monolithic catalyst 2 and palladium is further deposited in the upper stream part 20 arranged in the exhaust gas flowing-in side of the catalytic converter 1. The deposited density of the palladium in the upper stream part 20 is set to be 7-20g per 1 liter volume of the upper stream part 20 of the carrier. Consequently, unburned HC can be lessened by the catalyst for exhaust gas purification from immediately after starting of an engine to the time when the engine is warmed up and at the same time, the emission of platinum and CO, HC, NOx carried in the whole body of the catalyst can be lowered and thus the catalytic converter has high three-dimentional purification performance.

9. 发明专利

JPH0754644A ELECTRIC HEATING-TYPE CATALYST DEVICE 失效
公开(公告)号：JPH0754644A
公开(公告)日：1995-02-28
申请号：JP32283193
申请日：1993-12-21
申请人： TOYOTA MOTOR CORP , NIPPON SOKEN , NIPPON STEEL CORP
发明人： FUJISHIRO OSAMU , YOSHINAGA TORU , WATANABE MASAHIKO , SHINOHARA YUKIHIRO , KAWABE YASUYUKI , ICHIKAWA HIROAKI , YOSHIZAKI KOJI , NAGAMI TETSUO , ITO TOSHIHIKO , HIRAYAMA HIROSHI , ITO TAKAAKI , SANADA MASAKATSU , IZAWA AKIHIRO
IPC分类号： B01D53/86 , B01J35/02 , B01J35/04 , F01N3/20 , B01D53/87
摘要： PURPOSE:To contrive decrease in energy consumption by partially heating a catalyst support through a process of providing a partial heating part connected to the catalyst support so as to be partially electrified. CONSTITUTION:A metallic support 15 wherein a short-circuit passage 22 in the radial direction is formed is attached in the position of a first catalyst device 11 of a catalyst device 10, and only the metallic support 15 is connected to the power supply such as a battery. The short-circuit passage 22 is formed on the end surface on the upstream side, and electric resistance of the short-circuit passage 22 is smaller than that of a band-like body for constituting a honeycomb-like column 20, so large current flows to the short-circuit passage 22. Accordingly, the short-circuit passage 22 becomes a live to build a fire even in the relative narrow range, and action of the catalyst is started near there, and the reactive heat heats the other catalyst material, so as to raise the temperature successively, thereby the catalyst is activated. Thereby, warming of the whole of the catalyst device 10 is achieved in a short period by electric power smaller than the conventional one. Accordingly, the whole of the catalyst device 10 quickly and normally purifies exhaust gas after an engine is started, the discharging time of not purified exhaust gas is shortened, and the amount of contaminant is decreased.

10. 发明专利

JPH05220406A ELECTROTHERMAL TYPE METAL CARRIER CATALYST DEVICE 失效
公开(公告)号：JPH05220406A
公开(公告)日：1993-08-31
申请号：JP2790092
申请日：1992-02-14
申请人： NIPPON SOKEN , TOYOTA MOTOR CORP
发明人： FUJISHIRO OSAMU , YOSHINAGA TORU , WATANABE MASAHIKO , SHINOHARA YUKIHIRO , OGURA YOSHITSUGU , HIRAYAMA HIROSHI
IPC分类号： B01D53/94 , B01J35/02 , B01J35/04 , F01N3/20 , F01N3/28
摘要： PURPOSE:To eliminate a place partially delayed in activation and to prevent the discharge of untreated gas by changing the height or length of the corrugation of corrugated metal foil to make the heat value of the outer peripheral part and/or center part of a metal carrier larger than that of the intermediate part thereof. CONSTITUTION:A strip like material 7 is formed by bonding flat metal foil and corrugated metal foil in a superposed state and wound around a center electrode 6 to be received in an outer cylinder 2 in a tightly wound state to constitute an electrothermal type metal carrier. By partially changing the value of the height or length of the corrugation of the corrugated metal foil, the heat value per a unit volume in the outer peripheral part 18 near to the outer cylinder 2 in the metal carrier 3 and/or the center part 19 near to the center electrode 6 is made larger than that in the intermediate part 2 of the metal carrier. As a result, the metal carrier 3 uniformly rises in temp. as a whole and the whole of the carrier reaches the activating temp. of a catalyst at an early stage and catalytic function can be perfectly developed.

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