Patents by Inventor Naoko Irite
Naoko Irite has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 5882607Abstract: An exhaust gas cleaner is constituted of an Ag catalyst carrying an Ag component and a base metal catalyst carrying a Cu component and optionally W, V, Mo components, and a noble metal catalyst carrying a noble metal component. The base metal catalyst and the noble metal catalyst may be physically mixed to form a mixed catalyst. Another exhaust gas cleaner is constituted of the first Ag catalyst carrying an Ag component, the second Ag catalyst carrying an Ag component, a base metal catalyst carrying a Cu component and optionally W, V, Mo components, and a noble metal catalyst carrying a noble metal component. The second Ag catalyst carries the Ag component in an amount larger than that of the first Ag catalyst. The noble metal catalyst is physically mixed with the base metal catalyst to form a mixed catalyst. The exhaust gas cleaner can effectively remove nitrogen oxides in a wide temperature range of exhaust gas.Type: GrantFiled: June 26, 1997Date of Patent: March 16, 1999Assignees: Agency of Industrial Science and Technology, Kabushiki Kaisha RikenInventors: Tatsuo Miyadera, Kiyohide Yoshida, Mika Saito, Naoko Irite, Akira Abe, Masataka Furuyama
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Patent number: 5824621Abstract: An exhaust gas cleaner being constituted by a first catalyst of a first porous inorganic oxide supporting a silver component in combination with a W component and a second catalyst of a second porous inorganic oxide supporting a Pt component and optionally a W component. The Ag component may include Ag and compounds thereof, the Pt component may include Pt, Pd, Ru, Rh, Ir, and Au, and the W component may include W, V, Mn, Mo, Nb, and Ta. The W component effectively catalyzes the reduction of nitrogen oxides by ammonia to enhance the removal efficiency of the exhaust gas cleaner.Type: GrantFiled: June 27, 1995Date of Patent: October 20, 1998Assignee: Kabushiki Kaisha RikenInventors: Akira Abe, Kiyohide Yoshida, Gyo Muramatsu, Satoshi Sumiya, Naoko Irite, Mika Saito
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Patent number: 5780002Abstract: An exhaust gas cleaner is constituted of an Ag catalyst carrying an Ag component and a base metal catalyst carrying a Cu component and optionally W, V, Mo components, and a noble metal catalyst carrying a noble metal component. The base metal catalyst and the noble metal catalyst may be physically mixed to form a mixed catalyst. Another exhaust gas cleaner is constituted of the first Ag catalyst carrying an Ag component, the second Ag catalyst carrying an Ag component, a base metal catalyst carrying a Cu component and optionally W, V, Mo components, and a noble metal catalyst carrying a noble metal component. The second Ag catalyst carries the Ag component in an amount larger than that of the first Ag catalyst. The noble metal catalyst is physically mixed with the base metal catalyst to form a mixed catalyst. The exhaust gas cleaner can effectively remove nitrogen oxides in a wide temperature range of exhaust gas.Type: GrantFiled: July 9, 1997Date of Patent: July 14, 1998Assignees: Jiro Hiraishi, Director-General of Agency of Industrial Science and Technology, Kabushiki Kaisha RikenInventors: Tatsuo Miyadera, Kiyohide Yoshida, Mika Saito, Naoko Irite, Akira Abe, Masataka Furuyama
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Patent number: 5772973Abstract: Nitrogen oxides are removed from an exhaust gas containing nitrogen oxides and oxygen in an amount larger than its stoichiometric amount relative to unburned components in the exhaust gas, by (i) disposing an exhaust gas cleaner in a flow path of the exhaust gas, the exhaust gas cleaner comprising 0.2-15 weight % (on a metal basis) of fine silver or silver oxides having an average diameter of 10-1,000 nm and supported on a porous inorganic oxide; (ii) introducing hydrocarbons and/or oxygen-containing organic compounds into the exhaust gas on the upstream side of the exhaust gas cleaner; and (iii) bringing the exhaust gas into contact with the exhaust gas cleaner at a temperature of 200.degree.-600.degree. C., thereby causing a reaction of nitrogen oxides with the hydrocarbons and/or oxygen-containing organic compounds.Type: GrantFiled: February 24, 1997Date of Patent: June 30, 1998Assignees: Kabushiki Kaisha Riken, Hiroshi Kashiwagi of Director-General of Agency of Industrial Science and TechnologyInventors: Kiyohide Yoshida, Akira Abe, Tatsuo Miyadera, Naoko Irite
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Patent number: 5747410Abstract: Nitrogen oxides are removed from an exhaust gas containing nitrogen oxides and oxygen in an amount larger than its stoichiometric amount relative to unburned components in the exhaust gas, by using an exhaust gas cleaner having Ag supported by a porous inorganic oxide body and second catalyst containing second catalytically active components supported by a porous inorganic oxide body. The second catalytically active components consist essentially of Cu and/or other metals such as alkali metal elements, rare earth elements, etc.Type: GrantFiled: May 18, 1995Date of Patent: May 5, 1998Assignee: Kabushiki Kaisha RikenInventors: Gyo Muramatsu, Kazuhiko Ogiwara, Kiyohide Yoshida, Akira Abe, Naoko Irite, Shoji Mochida, Katsuji Onai
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Patent number: 5744111Abstract: Nitrogen oxides are removed from an exhaust gas containing nitrogen oxides and oxygen in an amount larger than its stoichiometric amount relative to unburned components in the exhaust gas, by using an exhaust gas cleaner having Ag supported by a porous inorganic oxide body and second catalyst containing second catalytically active components supported by a porous inorganic oxide body. The second catalytically active components consist essentially of Cu and/or other metals such as alkali metal elements, rare earth elements, etc.Type: GrantFiled: September 3, 1996Date of Patent: April 28, 1998Assignee: Kabushiki Kaisha RikenInventors: Gyo Muramatsu, Kazuhiko Ogiwara, Kiyohide Yoshida, Akira Abe, Naoko Irite, Shoji Mochida, Katsuji Onai
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Patent number: 5744112Abstract: A method of cleaning an exhaust gas using an exhaust gas cleaner constituted by a first catalyst comprising a first porous inorganic oxide supporting an Ag component, a W component and a Pt component and optionally a second catalyst comprising a second porous inorganic oxide supporting a Pt component alone or in combination with a W component. The Ag component may include Ag and compounds thereof, the Pt component of the first and second catalysts may include Pt, Pd, Ru, Rh, Ir and Au, and the W component of the first and second catalysts may include W, V, Mn, Mo, Nb and Ta. The W component effectively catalyze the reduction of nitrogen oxides by ammonia to enhance the removal efficiency of the exhaust gas cleaner.Type: GrantFiled: May 13, 1996Date of Patent: April 28, 1998Assignee: Kabushiki Kaisha RikenInventors: Naoko Irite, Akira Abe, Kiyohide Yoshida
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Patent number: 5741468Abstract: An exhaust gas cleaner is constituted by a first catalyst carrying an Ag component, a second catalyst carrying an Ni component or two or more of an Ni component, Ag component and Cu component, and optionally a third catalyst carrying a noble metal component alone or in combination with a base metal component. The second and third catalysts may be physically mixed to form a mixed catalyst. Another exhaust gas cleaner is constituted by a mixed catalyst of a first catalyst carrying an Ag component and a second catalyst carrying an Ni component alone or in combination with a Cu component, and a third catalyst carrying a noble metal component alone or in combination with a base metal component. Still another exhaust gas cleaner is constituted by a first catalyst carrying an Ag component, a second catalyst which is a mixture of an Ni catalyst, Ag catalyst and Cu catalyst, and optionally a third catalyst carrying a noble metal component alone or in combination with a base metal component.Type: GrantFiled: June 6, 1995Date of Patent: April 21, 1998Assignee: Kabushiki Kaisha RikenInventors: Mika Saito, Kiyohide Yoshida, Naoko Irite, Hong He, Akira Abe, Akira Nishiya
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Patent number: 5714432Abstract: Nitrogen oxides are removed from an exhaust gas containing nitrogen oxides and oxygen in an amount larger than its stoichiometric amount relative to unburned components in the exhaust gas, by (i) disposing an exhaust gas cleaner in a flow path of the exhaust gas, the exhaust gas cleaner comprising 0.2-15 weight % (on a metal basis) of fine silver or silver oxides having an average diameter of 10-1,000 nm and supported on a porous inorganic oxide; (ii) introducing hydrocarbons and/or oxygen-containing organic compounds into the exhaust gas on the upstream side of the exhaust gas cleaner; and (iii) bringing the exhaust gas into contact with the exhaust gas cleaner at a temperature of 200.degree.-600.degree. C., thereby causing a reaction of nitrogen oxides with the hydrocarbons and/or oxygen-containing organic compounds.Type: GrantFiled: May 4, 1995Date of Patent: February 3, 1998Assignees: Kabushiki Kaisha Riken, Hiroshi Kashiwagi of Director-General of Agency of Industrial Science and TechnologyInventors: Kiyohide Yoshida, Akira Abe, Tatsuo Miyadera, Naoko Irite
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Patent number: 5670444Abstract: Nitrogen oxides are efficiently removed from an exhaust gas containing nitrogen oxides and an excess amount of oxygen, by (i) disposing an exhaust gas cleaner in a flow path of the exhaust gas, the exhaust gas cleaner comprising a first catalyst comprising 0.2-15 weight % (on a metal basis) of at least one silver salt selected from the group consisting of silver halides, silver sulfate and silver phosphate supported on a porous inorganic oxide on an inlet side and a second catalyst comprising (a) 0.Type: GrantFiled: September 21, 1995Date of Patent: September 23, 1997Assignee: Kabushiki Kaisha RikenInventors: Kiyohide Yoshida, Gyo Muramatsu, Akira Abe, Naoko Irite
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Patent number: 5670443Abstract: An exhaust gas cleaner constituted by a first catalyst comprising a first porous inorganic oxide supporting an Ag component, a W component and a Pt component and optionally a second catalyst comprising a second porous inorganic oxide supporting a Pt component alone or in combination with a W component. The Ag component may include Ag and compounds thereof, the Pt component of the first and second catalysts may include Pt, Pd, Ru, Rh, Ir and Au, and the W component of the first and second catalysts may include W, V, Mn, Mo, Nb and Ta. The W component effectively catalyze the reduction of nitrogen oxides by ammonia to enhance the removal efficiency of the exhaust gas cleaner.Type: GrantFiled: May 18, 1995Date of Patent: September 23, 1997Assignee: Kabushiki Kaisha RikenInventors: Naoko Irite, Akira Abe, Kiyohide Yoshida
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Patent number: 5658542Abstract: Nitrogen oxides are efficiently removed from an exhaust gas containing nitrogen oxides and an excess amount of oxygen, by (i) disposing an exhaust gas cleaner in a flow path of the exhaust gas, the exhaust gas cleaner comprising a first catalyst comprising 0.2-15 weight % (on a metal basis) of at least one silver salt selected from the group consisting of silver halides, silver sulfate and silver phosphate supported on a porous inorganic oxide on an inlet side and a second catalyst comprising (a) 0.Type: GrantFiled: November 14, 1994Date of Patent: August 19, 1997Assignee: Kabushiki Kaisha RikenInventors: Kiyohide Yoshida, Gyo Muramatsu, Akira Abe, Naoko Irite
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Patent number: 5658543Abstract: Nitrogen oxides are efficiently removed frown an exhaust gas containing nitrogen oxides and an excess amount of oxygen, by (i) disposing an exhaust gas cleaner in a flow path of the exhaust gas, the exhaust gas cleaner comprising a first catalyst comprising 0.2-15 weight % (on a metal basis) of silver or silver oxide supported on a porous inorganic oxide on the inlet side and a second catalyst comprising 0.2-15 weight % (on a metal basis) of silver or silver oxide and 2 weight % or less (on a metal basis) of copper or copper oxide supported on a porous inorganic oxide on the outlet side; (ii) introducing hydrocarbons and/or oxygen-containing organic compounds into the exhaust gas on the upstream side of the exhaust gas cleaner; and (iii) bringing the exhaust gas into contact with the exhaust gas cleaner at a temperature of 200.degree.-600.degree. C.Type: GrantFiled: September 22, 1995Date of Patent: August 19, 1997Assignee: Kabushiki Kaisha RikenInventors: Kiyohide Yoshida, Gyo Muramatsu, Akira Abe, Naoko Irite
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Patent number: 5656249Abstract: Nitrogen oxides are removed from an exhaust gas containing nitrogen oxides and oxygen in an amount larger than its stoichiometric amount relative to unburned components in the exhaust gas, by (i) disposing an exhaust gas cleaner in a flow path of the exhaust gas, the exhaust gas cleaner comprising 0.2-15 weight % (on a metal basis) of fine silver or silver oxides having an average diameter of 10-1,000 nm and supported on a porous inorganic oxide; (ii) introducing hydrocarbons and/or oxygen-containing organic compounds into the exhaust gas on the upstream side of the exhaust gas cleaner; and (iii) bringing the exhaust gas into contact with the exhaust gas cleaner at a temperature of 200.degree.-600.degree. C., thereby causing a reaction of nitrogen oxides with the hydrocarbons and/or oxygen-containing organic compounds.Type: GrantFiled: February 14, 1996Date of Patent: August 12, 1997Assignees: Kabushiki Kaisha Riken, Hiroshi Kashiwagi of Director-General of Agency of Industrial Science and TechnologyInventors: Kiyohide Yoshida, Akira Abe, Tatsuo Miyadera, Naoko Irite
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Patent number: 5589432Abstract: Nitrogen oxides are efficiently removed from an exhaust gas containing nitrogen oxides and an excess amount of oxygen, by (i) disposing an exhaust gas cleaner in a flow path of the exhaust gas, the exhaust gas cleaner comprising a first catalyst comprising 0.2-15 weight % (on a metal basis) of silver or silver oxide supported on a porous inorganic oxide on the inlet side and a second catalyst comprising 0.2-15 weight % (on a metal basis) of silver or silver oxide and 2 weight % or less (on a metal basis) of copper or copper oxide supported on a porous inorganic oxide on the outlet side; (ii) introducing hydrocarbons and/or oxygen-containing organic compounds into the exhaust gas on the upstream side of the exhaust gas cleaner; and (iii) bringing the exhaust gas into contact with the exhaust gas cleaner at a temperature of 200.degree.-600.degree. C.Type: GrantFiled: May 4, 1995Date of Patent: December 31, 1996Assignee: Kabushiki Kaisha RikenInventors: Kiyohide Yoshida, Gyo Muramatsu, Akira Abe, Naoko Irite