Patents by Inventor Yasuyuki Takamitsu
Yasuyuki Takamitsu 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: 10556802Abstract: Provided is a method for producing an AEI zeolite without the use of a zeolite Y and a raw material containing fluorine and phosphorus, the method including a crystallization step of crystallizing a composition containing a structure directing agent, a sodium source, water, and a zeolite having at least one of the following structures as a silica alumina source.Type: GrantFiled: August 26, 2016Date of Patent: February 11, 2020Assignee: TOSOH CORPORATIONInventors: Yasuyuki Takamitsu, Tomoya Ishikawa, Mitsuaki Yoshimitsu
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Patent number: 10513439Abstract: Provided is a production method by which an AEI zeolite is obtained without inducing a structural transformation in a crystalline aluminosilicate having a Y-structure and without using fluorine or phosphorus, the method including a crystallization step of crystallizing a composition containing an alumina source, a silica source, a structure directing agent, a sodium source, and water, a weight proportion of crystalline aluminosilicate relative to a total weight of the alumina source and the silica source being from 0 wt. % to 10 wt. %, and the crystallization step satisfying at least one of the following conditions: a molar ratio of hydroxide ion to silica in the composition is 0.45 or greater, the composition contains a cation represented by (CH3)3RN+ (R represents an alkyl group having from 1 to 4 carbons, and the alkyl group may contain at least one substituent), and the crystallization time is 80 hours or longer.Type: GrantFiled: August 9, 2016Date of Patent: December 24, 2019Assignee: TOSOH CORPORATIONInventors: Tomoya Ishikawa, Hidekazu Aoyama, Mitsuaki Yoshimitsu, Seiji Maehama, Takayoshi Mishima, Yasuyuki Takamitsu
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Publication number: 20190009257Abstract: Provided is a method for producing an AEI zeolite without the use of a zeolite Y and a raw material containing fluorine and phosphorus, the method including a crystallization step of crystallizing a composition containing a structure directing agent, a sodium source, water, and a zeolite having at least one of the following structures as a silica alumina source.Type: ApplicationFiled: August 26, 2016Publication date: January 10, 2019Applicant: TOSOH CORPORATIONInventors: Yasuyuki TAKAMITSU, Tomoya ISHIKAWA, Mitsuaki YOSHIMITSU
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Publication number: 20180230017Abstract: Provided is a production method by which an AEI zeolite is obtained without inducing a structural transformation in a crystalline aluminosilicate having a Y-structure and without using fluorine or phosphorus, the method including a crystallization step of crystallizing a composition containing an alumina source, a silica source, a structure directing agent, a sodium source, and water, a weight proportion of crystalline aluminosilicate relative to a total weight of the alumina source and the silica source being from 0 wt. % to 10 wt. %, and the crystallization step satisfying at least one of the following conditions: a molar ratio of hydroxide ion to silica in the composition is 0.45 or greater, the composition contains a cation represented by (CH3)3RN+ (R represents an alkyl group having from 1 to 4 carbons, and the alkyl group may contain at least one substituent), and the crystallization time is 80 hours or longer.Type: ApplicationFiled: August 9, 2016Publication date: August 16, 2018Applicant: TOSOH CORPORATIONInventors: Tomoya ISHIKAWA, Hidekazu AOYAMA, Mitsuaki YOSHIMITSU, Seiji MAEHAMA, Takayoshi MISHIMA, Yasuyuki TAKAMITSU
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Patent number: 10035141Abstract: Provided is AEI zeolite having a uniform acid strength of an appropriate degree. AEI zeolite comprising phosphorus, preferably AEI zeolite comprising phosphorus in the pores, and a method for producing AEI zeolite comprising a crystallization step of crystallizing a raw material mixture containing a tetraethylphosphonium cation.Type: GrantFiled: July 9, 2014Date of Patent: July 31, 2018Assignees: TOSOH CORPORATION, HIROSHIMA UNIVERSITYInventors: Tsuneji Sano, Masahiro Sadakane, Yasuyuki Takamitsu
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Patent number: 9789476Abstract: A novel MFI zeolite that when used as a catalyst, can be used for a selective catalytic reaction for larger molecules and provides a method for producing the MFI zeolite. The MFI zeolite includes uniform mesopores having a pore distribution curve which a peak-width thereof at half height (hw) is at most 20 nm (hw?20 nm) and a center value (?) of a maximum peak is 10 nm or more and 20 nm or less (10 nm???20 nm), and having a pore volume (pv) of the uniform mesopores of at least 0.05 mL/g (0.05 mL/g?pv); the MFI zeolite has no peak in a range of 0.1° to 3° in powder X-ray diffraction measurement with a diffraction angle represented by 2?; and the MFI zeolite has an average particle diameter (PD) of at most 100 nm (PD?100 nm).Type: GrantFiled: March 25, 2013Date of Patent: October 17, 2017Assignee: TOSOH CORPORATIONInventors: Yasuyuki Takamitsu, Satoshi Yoshida
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Publication number: 20160144347Abstract: Provided is AEI zeolite having a uniform acid strength of an appropriate degree. AEI zeolite comprising phosphorus, preferably AEI zeolite comprising phosphorus in the pores, and a method for producing AEI zeolite comprising a crystallization step of crystallizing a raw material mixture containing a tetraethylphosphonium cation.Type: ApplicationFiled: July 9, 2014Publication date: May 26, 2016Applicants: TOSOH CORPORATION, HIROSHIMA UNIVERSITYInventors: Tsuneji SANO, Masahiro SADAKANE, Yasuyuki TAKAMITSU
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Publication number: 20150010468Abstract: A novel MFI zeolite that when used as a catalyst, can be used for a selective catalytic reaction for larger molecules and provides a method for producing the MFI zeolite. The MFI zeolite includes uniform mesopores having a pore distribution curve which a peak-width thereof at half height (hw) is at most 20 nm (hw?20 nm) and a center value (?) of a maximum peak is 10 nm or more and 20 nm or less (10 nm???20 nm), and having a pore volume (pv) of the uniform mesopores of at least 0.05 mL/g (0.05 mL/g?pv); the MFI zeolite has no peak in a range of 0.1° to 3° in powder X-ray diffraction measurement with a diffraction angle represented by 2?; and the MFI zeolite has an average particle diameter (PD) of at most 100 nm (PD?100 nm).Type: ApplicationFiled: March 25, 2013Publication date: January 8, 2015Inventors: Yasuyuki Takamitsu, Satoshi Yoshida
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Patent number: 8722560Abstract: A subject for the invention is to provide a highly heat-resistant SCR catalyst which has an NOx reduction percentage of 40% or higher at 200° C. after a hydrothermal durability treatment. The invention relates to use of ?-type zeolite which has an SiO2/Al2O3 molar ratio of 20 or higher but less than 30 and a crystallite diameter before a hydrothermal durability treatment of 20 nm or larger, shows a change in crystallite through the hydrothermal durability treatment of less than 10%, and has a fluorine content lower than 0.1%. The ?-type zeolite can be crystallized from a liquid reaction mixture containing a secondary and/or a tertiary alkylamine having 5 or more carbon atoms.Type: GrantFiled: August 17, 2009Date of Patent: May 13, 2014Assignee: Tosoh CorporationInventors: Yasuyuki Takamitsu, Yukio Ito
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Publication number: 20110136657Abstract: A subject for the invention is to provide a highly heat-resistant SCR catalyst which has an NOx reduction percentage of 40% or higher at 200° C. after a hydrothermal durability treatment. The invention relates to use of ?-type zeolite which has an SiO2/Al2O3 molar ratio of 20 or higher but less than 30 and a crystallite diameter before a hydrothermal durability treatment of 20 nm or larger, shows a change in crystallite through the hydrothermal durability treatment of less than 10%, and has a fluorine content lower than 0.1%. The ?-type zeolite can be crystallized from a liquid reaction mixture containing a secondary and/or a tertiary alkylamine having 5 or more carbon atoms.Type: ApplicationFiled: August 17, 2009Publication date: June 9, 2011Applicant: TOSOH CORPORATIONInventors: Yasuyuki Takamitsu, Yukio Ito