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81. 发明专利

JPH08196870A EXHAUST GAS PURIFYING DEVICE 失效
公开(公告)号：JPH08196870A
公开(公告)日：1996-08-06
申请号：JP1166695
申请日：1995-01-27
申请人： TOYOTA MOTOR CORP , TOYOTA CENTRAL RES & DEV
发明人： ISHII MASARU , MATSUNAGA SHINICHI , YOKOTA KOJI
IPC分类号： B01D53/86 , B01D53/94 , B01J23/40
摘要： PURPOSE: To provide a device by which NOx in an exhaust gas discharged when the fuel-air ratio is deviated to the lean side can particularly efficiently be removed. CONSTITUTION: In this device, a lean NOx catalyst (B) obtained by depositing a catalytic noble metal and an NOx occlusion material on a porous carrier is disposed on the upstream side of an exhaust gas passage and a three dimensional catalyst (A) obtained by depositing a catalytic noble metal on a porous carrier is disposed on the downstream side of the exhaust gas passage. NO in the exhaust gas is allowed to react with a large amount of oxygen in the exhaust gas on the lean NOx catalyst (B) on the upstream side of the exhaust gas passage to convert NO into NO2 , which is then occluded in the NOx occlusion material. At this time, the larger the amount of oxygen, the more easily the oxidation reaction of NO is effected and even when the fuel-air ratio is greatly deviated to the lean side in a transition region, the reaction is satisfactorily effected. When the fuel-air ratio is on the rich side, NOx occluded in the NOx occlusion material is released, and then, reduced and removed not only on the lean NOx catalyst (B) but also on the three dimensional catalyst (A).

82. 发明专利

JPH0810574A NITROGEN OXIDES PURIFYING METHOD 失效
公开(公告)号：JPH0810574A
公开(公告)日：1996-01-16
申请号：JP17321294
申请日：1994-06-30
申请人： TOYOTA CENTRAL RES & DEV , TOYOTA MOTOR CORP
发明人： YOKOTA KOJI , FUKUI MASAYUKI , TANAKA TOSHIYUKI , TAKI MASAHIRO , OSHIMA YUJIRO , MATSUMOTO SHINICHI
IPC分类号： B01D53/94 , B01J23/652
摘要： PURPOSE:To purify NOX in an exhaust gas in a low temp. range at a high removing rate under an oxygen excess atmosphere by the action of hydrogen coexisting in the exhaust gas. CONSTITUTION:This nitrogen oxides purifying method is a nitrogen oxides reduction method for reducing nitrogen oxides contained in the exhaust gas in which the oxygen concn. is equal to or above the stoichiometric ratio required for oxidizing a component to be oxidized in the exhaust gas, and the exhaust gas containing excess oxygen coexisting with hydrogen is brought into contact with a nitrogen oxides reducing catalyst constituted so as to contain a noble metal element and molybdenum carried on a porous carrier.

83. 发明专利

JPH06384A CATALYST FOR PURIFICATION OF NITROGEN OXIDE AND CONTACT DECOMPOSITION OF NITROGEN OXIDE 失效
公开(公告)号：JPH06384A
公开(公告)日：1994-01-11
申请号：JP18860392
申请日：1992-06-22
申请人： TOYOTA CENTRAL RES & DEV , TOYOTA MOTOR CORP , TOSOH CORP
发明人： YOKOTA KOJI , SAIKI MOTOHISA , FUKUI MASAYUKI , MATSUMOTO SHINICHI , ISHIBASHI KAZUNOBU , SEKIZAWA KAZUHIKO , KASAHARA SENJI
IPC分类号： B01D53/94 , B01J29/76 , B01J29/34 , B01D53/36
摘要： PURPOSE:To provide a catalyst for purification of nitrogen oxide excellent in purification efficiency of nitrogen oxide in exhaust gas in an oxygen-excess atmosphere, and to provide a contact decomposition method of nitrogen oxide. CONSTITUTION:This catalyst is used to purify nitrogen oxide in exhaust gas in an oxygen-excess atmosphere, and consists of zeolite on which chloride and one or more element selected from copper and alkaline earth metals are deposited. Also, this invention relates to the method for contact decomposition of nitrogen oxide by bringing exhaust gas with excess oxygen atmosphere into contact with the catalyst. The exhaust gas containing org. compds. and excess oxygen is brought into contact with the catalyst for purification of nitrogen oxide consisting of zeolite on which chloride and one or more element selected from copper and alkaline earth metals are deposited.

84. 发明专利

JPH05168942A NITROGEN OXIDE PURIFYING CATALYST 失效
公开(公告)号：JPH05168942A
公开(公告)日：1993-07-02
申请号：JP33822191
申请日：1991-12-20
申请人： TOYOTA CENTRAL RES & DEV , TOYOTA MOTOR CORP , TOSOH CORP
发明人： YOKOTA KOJI , ADACHI MARIKO , SAIKI MOTOHISA , MATSUMOTO SHINICHI , SEKIZAWA KAZUHIKO , KASAHARA SENJI
IPC分类号： B01D53/94 , B01J29/72
摘要： PURPOSE:To provide the title catalyst usable within a wide temp. region by enhancing the purifying capacity of nitrogen oxide within a low temp. region. CONSTITUTION:A nitrogen oxide purifying catalyst reducing nitrogen oxide in exhaust gas to nitrogen in the coexistence of hydrocarbon within an oxygen excessive atmosphere is composed of zeolite having one or more kind of a component among copper and cobalt supported thereon by ion exchange and further having gold supported thereon.

85. 发明专利

JPH04365920A EXHAUST PURIFYING METHOD 失效
公开(公告)号：JPH04365920A
公开(公告)日：1992-12-17
申请号：JP14014791
申请日：1991-06-12
申请人： TOYOTA CENTRAL RES & DEV , TOYOTA MOTOR CORP
发明人： YOKOTA KOJI , MATSUMOTO SHINICHI , ISHIBASHI KAZUNOBU , TANAKA TOSHIAKI
IPC分类号： F01N3/24 , F01N3/08 , F02D41/04 , F23J15/00
摘要： PURPOSE:To enhance purifying efficiency by converting nitrogen oxides (NOx) exhausted from cylinders operated under an excessive fuel condition into NH3, merging thereto exhaust air exhausted from the cylinders respectively operated under the excessive and lean fuel conditions so as to purify NOx and NH3 into N2 with a second catalyst. CONSTITUTION:An ECU 2 judges that a first cylinder is operated under a lean fuel condition on the basis of a detection signal output from an oxygen sensor 16 disposed in the first cylinder of a multiple cylinder internal combustion engine 1. In this case, the ECU 2 first increases fuel injected from electronic injection valves 17 disposed on a branch pipe of an intake branch pipe 15 communicated with an intake port of the first cylinder. Meanwhile, second and fourth cylinders are operated under the lean fuel condition. Next, NOx exhausted from a cylinder operated under an excessive fuel condition is converted into NH3 with a first catalyst 3. Subsequently, exhaust air exhausted from the cylinders respectively operated under the excessive and lean fuel conditions is merged in an exhaust manifold 6, and then, NOx and NH3 in an exhaust confluence are purified into N2 with a second catalyst 4.

86. 发明专利

JPH04215846A CATALYST FOR PURIFYING EXHAUST GAS 失效
公开(公告)号：JPH04215846A
公开(公告)日：1992-08-06
申请号：JP26482090
申请日：1990-10-01
申请人： TOYOTA CENTRAL RES & DEV , TOYOTA MOTOR CORP , TOSOH CORP
发明人： KONDO SHIRO , YOKOTA KOJI , MATSUMOTO SHINICHI , ISHIBASHI KAZUNOBU , KASAHARA SENJI , ESHITA AKINORI
IPC分类号： B01D53/94 , B01J29/42 , B01J29/46
摘要： PURPOSE:To efficiently remove nitrogen oxides and the like by contacting catalysts comprising Co, alkaline earth metals and rare earth metals carried by zeolite having the ratio SiO2/Al2O3 of 15 or more with exhaust gas in an oxygen excessive atmosphere. CONSTITUTION:Co, alkaline earth metals and rare earth metals are carried by zeolite having the mole ratio SiO2/AL2O3 of 15 or more by an ion-exchange method or impregnation method to provide catalysts for purifying exhaust gas. As zeolite, ZSM-5,Y having the mole ratio SiO2/Al2O3 of 20-200 or one having mordent structure are preferable. High ion-exchange rate of Co is desirable and conventional methods can be used for ion-exchange of the alkaline earth metals and rare earth metals. The catalysts thus provided can efficiently remove nitrogen oxides, hydrocarbons and carbon monoxides within a wide temperature range of 80 deg.C or lower in an oxygen excessive atmosphere.

87. 发明专利

JPH03202157A CATALYST FOR PURIFYING EXHAUST GAS 失效
公开(公告)号：JPH03202157A
公开(公告)日：1991-09-03
申请号：JP34053089
申请日：1989-12-27
申请人： TOYOTA CENTRAL RES & DEV , TOYOTA MOTOR CORP , TOSOH CORP
发明人： KONDO SHIRO , YOKOTA KOJI , MATSUMOTO SHINICHI , ISHIBASHI KAZUNOBU , KASAHARA SENJI , NAKANO MASAO
IPC分类号： B01D53/94 , B01D53/26 , B01J29/072 , B01J29/14 , B01J29/24 , B01J29/46
摘要： PURPOSE:To obtain a NOx removing catalyst having excellent purifying capacity and durability generating no lowering of catalytic activity by supporting copper, alkaline earth metal and rare earth metal on zeolite. CONSTITUTION:As a catalyst removing NOx in exhaust gas, copper, alkaline earth metal such as Mg or Ca and rare earth metal such as La or Ce are supported on zeolite. Whereupon, NO is adsorbed on Cu, and NO and NO2 are adsorbed on alkaline earth metal and rare earth metal, and NO, etc., are immediately subjected to the catalytic reaction with the org. compound in exhaust gas to be reduced to harmless N2. This catalyst has excellent purifying capacity in an oxygen excessive atmosphere held to a wide range temp. region of 800 deg.C or lower and generates no lowering of activity even when it is used for a long time.

88. 发明专利

JPH03193139A EXHAUST GAS PURIFYING CATALYST AND USING METHOD 失效
公开(公告)号：JPH03193139A
公开(公告)日：1991-08-22
申请号：JP33174089
申请日：1989-12-21
申请人： TOSOH CORP , TOYOTA MOTOR CORP , TOYOTA CENTRAL RES & DEV
发明人： ESHITA AKINORI , KASAHARA SENJI , MATSUMOTO SHINICHI , ISHIBASHI KAZUNOBU , YOKOTA KOJI , KONDO SHIRO
IPC分类号： B01D53/94 , B01J29/064 , B01J29/14 , B01J29/24 , B01J29/42 , B01J29/46 , B01J29/68
摘要： PURPOSE:To obtain a ternary catalyst reduced in thermal deterioration and durability by setting the SiO2/Al2O3 mol ratio of zeolite to a definite value or more and adding cobalt in a specific amount based on the number of mols of Al2O3 in zeolite. CONSTITUTION:Zeolite has a composition of xM2/nO.Al2O3.SiO2 qH2O (wherein (n) is a valence of a cation, x=0.8-2, y>=2 and q>=0) and one having a SiO2/Al2 O3 mol. ratio of 10 or more is used. Further, zeolite contains cobalt in the renge of 0.9-1.6 M based on the number of moles of Al2O3 in zeolite. The catalyst thus obtained simultaneously removes nitrogen oxide, carbon monoxide and hydrocarbon from oxygen excessive exhaust gas and is reduced in thermal deterioration and excellent in durability.

89. 发明专利

JPH03131345A CATALYST FOR PURIFYING EXHAUST GAS 失效
公开(公告)号：JPH03131345A
公开(公告)日：1991-06-04
申请号：JP26963789
申请日：1989-10-16
申请人： TOYOTA CENTRAL RES & DEV , TOYOTA MOTOR CORP , TOSOH CORP
发明人： KONDO SHIRO , YOKOTA KOJI , FUKUI MASAYUKI , TAKESHIMA SHINICHI , ISHIBASHI KAZUNOBU , KASAHARA SENJI
IPC分类号： B01D53/94 , B01J29/14 , B01J29/24 , B01J29/46
摘要： PURPOSE:To remove nitrogen oxide in exhaust gas for a long period of time over a wide temp. range by using a catalyst wherein copper and alkaline earth metal are supported on zeolite in an oxygen excessive atmosphere in the presence of an org. compound. CONSTITUTION:Copper and alkaline earth metal such as Mg or Ca are supported on zeolite such ZSM-5 having an SiO2/Al2O3 mol ratio of about 30-200. This catalyst is used in an oxygen excessive atmosphere in the presence of an org. compound. When exhaust gas comes into contact with this catalyst, NO is adsorbed on Cu while NO and NO2 are adsorbed on alkaline earth metal and NO or the like generates the catalytic reaction with the org. compound in exhaust gas to be reduced to harmless N2. Therefore, this catalyst has high activity and does not lower in its activity even within a wide temp. region of about 800 deg.C or lower.

90. 发明专利

JPH0278437A PRODUCTION OF CATALYST FOR PURIFICATION OF EXHAUST GAS 失效
公开(公告)号：JPH0278437A
公开(公告)日：1990-03-19
申请号：JP23299588
申请日：1988-09-16
申请人： TOYOTA CENTRAL RES & DEV
发明人： HATTORI NAOKO , KIMURA MAREO , YOKOTA KOJI
IPC分类号： B01D53/94 , B01J23/40 , B01J23/89 , B01J37/02
摘要： PURPOSE:To obtain a catalyst for purification of exhaust gas not deteriorating purifying characteristics by impregnating a soln. prepd. by dissolving salts of Pt family elements in a nonaq. solvent into an inorg. carrier and by calcining this impregnated carrier. CONSTITUTION:When one or more kinds of Pt family elements such as Pt and Pd are supported on an inorg. carrier, a soln. prepd. by dissolving salts of the Pt family elements such as palladium acetate in a nonaq. solvent such as acetone is impregnated into the inorg. carrier and this impregnated carrier is calcined to obtain a catalyst for purification of exhaust gas. Since the soln. is not acidic, the salts do not react with the inorg. carrier and the catalytic activity to CO, HC and NOx in exhaust gas is not deteriorated.

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