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1. 发明专利

JPH0857315A CATALYST FOR PURIFICATION OF EXHAUST GAS 失效
公开(公告)号：JPH0857315A
公开(公告)日：1996-03-05
申请号：JP20237994
申请日：1994-08-26
申请人： TOYOTA CENTRAL RES & DEV , TOYOTA MOTOR CORP
发明人： SHINJO HIROBUMI , SAIKI MOTOHISA , TANABE TOSHITAKA , NAGAI MAYUKO
IPC分类号： B01D53/94 , B01J23/58
摘要： PURPOSE: To enhance the NOx removing performance of a catalyst for purification of exhaust gas contg. both of a barium compd. and cerium oxide by carrying at least one of Pd and Pt on each of porous carriers separately contg. the barium compd. and cerium oxide. CONSTITUTION: This catalyst consists of a carrier substrate 1, a 1st catalyst carrying layer 2 formed on the surface of the substrate 1 and contg. at least one of Pd and Pt, cerium oxide and alumina, and a 2nd catalyst carrying layer 3 formed on the surface of the layer 2 and contg. at least one of Pd and Pt, a barium compd. and alumina. The porous carriers of the layers 2, 3 are preferably made of activated alumina and the total amt. of Pd or Pt carried is preferably 0.05-30g per 1l of this catalyst. The contents of the barium compd. and cerium oxide are preferably 0.01-1.0mol and 0.01-3.0mol per 1l of this catalyst, respectively.

2. 发明专利

JPH07124471A EXHAUST GAS PURIFICATION CATALYST FOR INTERNAL-COMBUSTION ENGINE USING ALCOHOLIC FUEL 失效
公开(公告)号：JPH07124471A
公开(公告)日：1995-05-16
申请号：JP30124393
申请日：1993-11-04
申请人： TOYOTA CENTRAL RES & DEV , TOYOTA MOTOR CORP
发明人： MATSUNAGA SHINICHI , MIZUTANI YORIKO , DOMAE KAZUHIKO , NAGAMI TETSUO , NAGAI MAYUKO
IPC分类号： B01D53/86 , B01D53/94 , B01J23/50 , B01J23/66 , B01J23/68 , B01J23/89 , B01J35/04
摘要： PURPOSE:To obtain a catalyst capable of removing formaldehyde and methanol in exhaust gas from an internal-combustion engine using alcoholic fuel at a high rate of removal from an almost constant low temp. CONSTITUTION:Silver and oxide of at least one kind of element selected from among alkaline earth metals, rare earth metals, iron, nickel, cobalt and bismuth are carried on a porous carrier to obtain the objective catalyst.

3. 发明专利

JPH0824644A CATALYST FOR PURIFYING EXHAUST GAS 失效
公开(公告)号：JPH0824644A
公开(公告)日：1996-01-30
申请号：JP16408894
申请日：1994-07-15
申请人： TOYOTA MOTOR CORP , CATALER IND CO
发明人： HIRAYAMA HIROSHI , NAGAI MAYUKO , SATOU HIRONORI , MATSUURA SHINJI
IPC分类号： B01D53/94 , B01J23/58
摘要： PURPOSE:To improve a ternary catalyst using palladium as a catalyst component and to further enhance NOx removing capacity in an atmosphere slightly lean as compared with a stoichiometric atmosphere. CONSTITUTION:The catalyst for purifying exhaust gas is constituted of a carrier base material, the catalyst supporting layer applied and formed to the surface of the carrier base material and the catalytically active component consisting of palladium, platinum and alkaline earth metal supported on the catalyst supporting layer and characterized by that platinum is supported on the upstream side with respect to an exhaust gas flowing direction. By supporting platinum having a characteristic excellent in purifying capacity under a condition large in the amplitude of fluctuation of an air/fuel ratio (A/F) on the upstream side, the balance between the characteristic of palladium excellent in ternary activity in the vicinity of stoichiometry and the characteristic of platinum excellent in NOx removing capacity on a lean atmosphere side becomes optimum and NOx removing capacity in an atmosphere slightly lean as compared with a stoichiometric atmosphere is enhanced.

4. 发明专利

JPH05168949A MANUFACTURE OF EXHAUST GAS PURIFICATION CATALYST 失效
公开(公告)号：JPH05168949A
公开(公告)日：1993-07-02
申请号：JP34472891
申请日：1991-12-26
申请人： TOYOTA MOTOR CORP
发明人： NAGAMI TETSUO , NAGAI MAYUKO
IPC分类号： B01D53/94 , B01J23/58 , B01J37/03
摘要： PURPOSE:To improve the low temperature activity of a catalyst by providing the first process for the preparation of the first alcohol solution or ethylene glycol solution, the second process for the preparation of the second solution, the third process for the formation of a hydrolytic product, the fourth process for the processing of said product into carrier powder and the fifth process for the formation of a catalyst. CONSTITUTION:The first process adjusts the first alcohol solution or an ethylene glycol solution which contains carrier powder carrying a catalytic metal and 10 to 50wt.% of aluminum alkoxide for the former. The second process adds a catalytic metal salt dissolved in the ethylene glycol solution to the first alcohol solution or ethylene glycol solution and thereby prepares these materials as the second solution containing the carrier powder, aluminum alkoxide and catalytic metal salt. The third process forms a hydrolytic product on the surface of the carrier powder by adding water to the second solution and allowing the mixture to undergo a hydrolytic process. The fourth process separates and bakes the carrier powder from the second solution to obtain carrier powder to be carried 2A. Finally the fifth process forms a catalyst 1A.

5. 发明专利

JPH05168948A MANUFACTURE OF CATALYST FOR EXHAUST GAS PURIFICATION 失效
公开(公告)号：JPH05168948A
公开(公告)日：1993-07-02
申请号：JP34447991
申请日：1991-12-26
申请人： TOYOTA MOTOR CORP
发明人： NAGAI MAYUKO , NAGAMI TETSUO
IPC分类号： B01D53/94 , B01J23/58 , B01J37/03
摘要： PURPOSE:To improve the low temperature activity of a catalyst by manufacturing it through the first process where the first alcohol solution or ethylene glycol solution is prepared, the second process where the second solution is prepared, the third process where a carrier containing water is formed, the fourth process where a hydrolytic product is formed and the fifth process where a catalyst carrier is baked. CONSTITUTION:The first process is to prepare the first alcohol solution or ethylene glycol solution containing aluminum alkoxide, and the second process is to add catalytic metal salts dissolved in an ethylene glycol solution to the first alcohol or ethylene glycol solution to prepare the second solution containing aluminum alkoxide and catalytic carrier salts. The third process is to obtain a carrier containing water by allowing water to attach to the surface 12a of a catalyst carrying layer 12 and the surface of an active alumina particle 2, the fourth process is to form a hydrolytic product on the both surfaces of a carrier containing water by allowing the carrier to come in contact with the second solution, and the fifth process is to bake catalyst carriers 1A, 2 having the hydrolytic product.

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