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81. 发明专利

JPS6019036A CATALYST FOR PURIFYING EXHAUST GAS 失效
公开(公告)号：JPS6019036A
公开(公告)日：1985-01-31
申请号：JP12662983
申请日：1983-07-12
申请人： TOYOTA MOTOR CO LTD
发明人： MIYOSHI NAOTO , MATSUMOTO SHINICHI , SAKURAI SHIGENORI
IPC分类号： B01D53/94 , B01J23/46 , B01J37/02 , B01D53/36
摘要： PURPOSE:To enhance CO-purifying capacity as a low temp., by a method wherein upper and lower two activated alumina layers are laminated to the surface of a base material and platinum or Pd is supported by the lower layer while Ph and platinum or Rh and Pd are supported by the upper layer. CONSTITUTION:Upper and lower two activated alumina layers are laminated to the surface of a base material comprising cordierite and platinum or Pd is supported by the lower layer while Rh and platinum or Rh and Pd are supported by the upper layer. With respect to the amount of each catalytic metal, Rh is 0.1- 0.3g/l or Pt or Pd is about 0.5g/l in the upper layer while Pt or Pd is about 0.5g/l in the lower layer. Because this catalyst supports not only Rh having strong poisoning resistance to CO, lead or phosphorus only in the upper layer thereof but also platinum or Pd in a proper amount, platinum or Pd in the lower layer is protected. In addition, because CO-oxidation in the lower layer is facilitated by diffusing CO in the upper layer, the ignition temp. of CO is lowered and this catalyst shows excellent purifying capacity even at a lower temp. as compared with a conventional one.

82. 发明专利

JPS58170540A PREPARATION OF EXHAUST GAS PURIFYING CATALYST 失效
公开(公告)号：JPS58170540A
公开(公告)日：1983-10-07
申请号：JP5337682
申请日：1982-03-30
申请人： TOYOTA MOTOR CO LTD
发明人： MIYOSHI NAOTO , SAKURAI SHIGENORI , MATSUMOTO SHINICHI
IPC分类号： B01D53/94 , B01J23/44 , B01J23/46 , B01J37/02
摘要： PURPOSE:To obtain a catalyst having purification efficiency higher thanthat of a platinum/rhodium catalyst, by a method wherein a palladium containing alumina layer is formed on an activated alumina layer formed on a support substrate and a platinum layer and/or a rhodium layer is further formed. CONSTITUTION:For example, a cordieritie type monolithic support substrate is immersed in a slurry containing alumina and, after drawn up therefrom, the impregnated support substrate is introduced into a gas stream cell to blow off the slurry. After drying, the treated support substrate is immersed in an aqueous solution of a compound containing palladium and an activated alumina layer A containing palladium is obtained by drying. In the next step, the resulting support substrate having the palladium containing activated alumina layer A formed thereon is immersed again in the aforementioned alumina slurry to obtain activated alumina layer B containing no noble metal on the palladium containing alumina layer. The obtained support substrate having the layers A, B is immersed in an aqueous solution of a compound containing platinum and/or rhodium to impregnate the activated alumina layer B with platinum and/or rhodium by aforementioned similar operation.

83. 发明专利

JPS58146441A CATALYST FOR PURIFICATION OF EXHAUST GAS 失效
公开(公告)号：JPS58146441A
公开(公告)日：1983-09-01
申请号：JP2745582
申请日：1982-02-24
申请人： TOYOTA MOTOR CO LTD
发明人： OGURA YOSHITSUGU , MIYOSHI NAOTO , YOSHIDA KAZUKO , SAKURAI SHIGENORI , SUZUKI YOSHIHIRO
IPC分类号： B01D53/94 , B01J23/46 , B01J37/02 , F01N3/28
摘要： PURPOSE:To provide a catalyst for purification of exhaust gas which eliminates the mutual effect among the catalysts and improves purifying performance, by depositing a Pd-contg. alumina layer and a Pt-Rh or Rh-contg. alumina layer separately on a catalyst carrier. CONSTITUTION:A Pd-contg. alumina layer 2 is formed as underlayer on a catalyst carrier 1 of a honeycomb shape, and a Pt-Rh or Rh-contg. alumina layers 3 is formed on said layer. Or both layers 2, 3 are formed in reverse order. The mutual effect of Pd and Pt or Rh is eliminated by such catalyst for purification and the purification performance for exhaust gas from an internal combustion engine, etc. is improved.

84. 发明专利

JPS60235641A MONOLITHIC CATALYST FOR PURIFYING EXHAUST GAS 失效
公开(公告)号：JPS60235641A
公开(公告)日：1985-11-22
申请号：JP9165984
申请日：1984-05-07
申请人： TOYOTA MOTOR CO LTD
发明人： MATSUMOTO SHINICHI , MIYOSHI NAOTO
IPC分类号： B01D53/94 , B01J23/46 , B01J35/04 , B01J37/02
摘要： PURPOSE:To improve the purifying capacity and durability of a monolithic catalyst by allowing an alumina layer to carry the catalyst component wherein the depth of the catalyst carried by the alumina layer is made larger at the inlet side of the exhaust gas and smaller at the outlet side of the exhaust gas. CONSTITUTION:Many cells are formed in the axial direction from the inlet side 3 toward the outlet side 4 of the exhaust gas, and an alumina layer 2 is formed on the inside wall of the cells. A monolithic catalyst 1 is formed by allowing the alumina layer 2 to carry the catalyst component. In this case, the depth of the catalyst to be carried by the alumina layer may be made gradually or stagewise smaller from the inlet side 3 toward the outlet side 4 of the exhaust gas. If it is formed stagewise smaller, a range corresponding to 1/5-1/2 of the total length along the axial direction at the inlet side 3 of the monolithic catalyst 1 is pref. made to have larger depth with the rest shallower.

85. 发明专利

JPS60232253A MONOLITHIC CATALYST FOR PURIFYING EXHAUST GAS 失效
公开(公告)号：JPS60232253A
公开(公告)日：1985-11-18
申请号：JP8713284
申请日：1984-04-27
申请人： TOYOTA MOTOR CO LTD
发明人： MATSUMOTO SHINICHI , MIYOSHI NAOTO
IPC分类号： B01D53/94 , B01J23/56 , B01J23/63 , B01J35/04 , B01J37/02
摘要： PURPOSE:To obtain a monolithic catalyst for purifying exhaust gas wherein the purification capacity and durability of a Pt-Pd-Rh catalyst are enhanced, by suppressing the particle growth of palladium to eliminate the adverse influence of palladium upon platinum or rhodium. CONSTITUTION:The titled catalyst forms a columnar shape and is provided with a large number of cells from the inlet side of exhaust gas toward the outlet thereof, wherein an alumina layer is formed to the inner wall surfaces of said cells and catalytic components are supported by said alumina layer. The aforementioned alumina layer is constituted of a first alumina layer 2 supporting palladium and neodium inside the inner wall surface of each cell and a second alumina layer 3 supporting platinum and rhodium in the surface side thereof.

86. 发明专利

JPS60114341A CATALYST FOR PURIFYING EXHAUST GAS 失效
公开(公告)号：JPS60114341A
公开(公告)日：1985-06-20
申请号：JP22394383
申请日：1983-11-28
申请人： TOYOTA MOTOR CO LTD
发明人： MATSUMOTO SHINICHI , MIYOSHI NAOTO
IPC分类号： B01D53/94 , B01J23/56 , B01J23/63
摘要： PURPOSE:To obtain a ternary catalyst of high active Pd/Rh series having excellent durability by depositing Pd, Rh and Nd and/or Sm as a catalyst component on a catalytic carrier consisting of alumina or the like. CONSTITUTION:Pd, Rh and Nd and/or Sm as a catalyst component are deposited on a catalytic carrier consisting of alumina or the like. In said catalyst, the controlling effect over the growth of Pd grain that is considered as caused by forming a composite oxide with Pd appears by adding Nd or Sm, and the activity as a ternary catalyst and the durability are improved thereby.

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