Patents by Inventor Lun-Teh Yuen
Lun-Teh Yuen 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: 8545805Abstract: The invention is directed to a method for making small crystal zeolites, such as small crystal SSZ-32, in the absence of an amine component.Type: GrantFiled: November 5, 2010Date of Patent: October 1, 2013Assignee: Chevron U.S.A. Inc.Inventors: Stacey I. Zones, Bowman Lee, Lun-Teh Yuen, Tracy M. Davis, James N. Ziemer, Adeola Ojo
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Publication number: 20120114553Abstract: The invention is directed to a method for making small crystal zeolites, such as small crystal SSZ-32, in the absence of an amine component.Type: ApplicationFiled: November 5, 2010Publication date: May 10, 2012Inventors: Stacey I. Zones, Bowman Lee, Lun-Teh Yuen, Tracy M. Davis, James N. Ziemer, Adeola Ojo
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Publication number: 20110311441Abstract: Disclosed is a method for preparing crystalline zeolite SSZ-13, said method comprising (a) preparing a reaction mixture comprising (1) at least one active source of an oxide of a tetravalent element or mixture of tetravalent elements, (2) optionally at least on active source of an oxide of a trivalent element or mixture of trivalent elements, (3) at least one active source of an alkali metal, (4) seed crystals of zeolite SSZ-13, (5) benzyl trimethylammonium cation in an amount sufficient to form crystals of zeolite SSZ-13, the benzyl trimethylammonium cation being used in the absence of a 1-adamantammonium cation, and (6) an amount of water that is not substantially in excess of the amount required to cause and maintain crystallization of the small pore zeolite; and (b) heating said reaction mixture at crystallization conditions for sufficient time to form crystallized material containing crystals of SSZ-13.Type: ApplicationFiled: August 29, 2011Publication date: December 22, 2011Applicant: Chevron U.S.A Inc.Inventors: Stephen J. Miller, Lun-Teh Yuen
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Patent number: 8057782Abstract: Disclosed is a method for preparing crystalline small pore molecular sieves, said method comprising (a) preparing a reaction mixture comprising (1) at least one active source of an oxide of a tetravalent element or mixture of tetravalent elements, (2) optionally at least on active source of an oxide of a trivalent element or mixture of trivalent elements, (3) at least one active source of an alkali metal, (4) seed crystals capable of forming the small pore molecular sieve, (5) a structure directing agent capable of forming the small pore molecular sieve, and (6) an amount of water that is not substantially in excess of the amount required to cause and maintain crystallization of the small pore molecular sieve; and (b) heating said reaction mixture at crystallization conditions for sufficient time to form crystallized material containing crystals of the small pore molecular sieve.Type: GrantFiled: September 27, 2007Date of Patent: November 15, 2011Assignee: Chevron U.S.A. Inc.Inventors: Stephen J. Miller, Lun-teh Yuen
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Patent number: 8007764Abstract: Disclosed is a method for preparing crystalline zeolite SSZ-13 said method comprising (a) preparing a reaction mixture comprising (1) at least one active source of an oxide of a tetravalent element or mixture of tetravalent elements, (2) optionally at least on active source of an oxide of a trivalent element or mixture of trivalent elements (3) at least one active source of an alkali metal, (4) seed crystals of zeolite SSZ-13, (5) benzyl trimethylammonium cation in an amount sufficient to form crystals of zeolite SSZ-13, the benzyl trimethylammonium, cation being used in the absence of a 1-adamantammonium cation, and (6) an amount of water that is not substantially in excess of the amount required to cause and maintain crystallization of the small pore zeolite; and (b) heating said reaction mixture at crystallization conditions for sufficient time to form crystallized material containing crystals of SSZ-13.Type: GrantFiled: September 27, 2007Date of Patent: August 30, 2011Assignee: Chevron U.S.A. Inc.Inventors: Stephen J. Miller, Lun-teh Yuen
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Patent number: 7749471Abstract: A process for reduction of oxides of nitrogen contained in a gas stream comprising contacting the gas stream with a boron-containing molecular sieve, the boron-containing molecular sieve having the CHA crystal structure and comprising (1) silicon oxide and (2) boron oxide or a combination of boron oxide and aluminum oxide, iron oxide, titanium oxide, gallium oxide and mixtures thereof; and wherein the mole-ratio of silicon oxide to boron oxide in said boron-containing molecular sieve is between 15 and 125. A method for reduction of oxides of nitrogen, comprising a) selecting the boron-containing molecular sieve; and b) contacting a gas stream with the molecular sieve. A method for reduction of oxides, comprising: a) selecting the boron-containing molecular sieve containing a metal or metal ions capable of catalyzing the reduction of the oxides of nitrogen; and b) contacting an exhaust stream of an internal combustion engine with the molecular sieve.Type: GrantFiled: November 16, 2007Date of Patent: July 6, 2010Assignee: Chevron U.S.A. Inc.Inventors: Lun-Teh Yuen, Stacey I. Zones
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Patent number: 7597874Abstract: The present invention is directed to a process for producing crystalline zeolites from a reaction mixture containing an N,N,N-trialkyl benzyl quaternary ammonium cation as a structure directing agent.Type: GrantFiled: June 23, 2008Date of Patent: October 6, 2009Assignee: Chevron U.S.A. Inc.Inventors: Stephen J. Miller, Lun-Teh Yuen
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Publication number: 20090131730Abstract: A process for the production of light olefins from a feedstock comprising an oxygenate or mixture of oxygenates, the process comprising reacting the feedstock at effective conditions over a catalyst comprising boron-containing molecular sieve having the CHA crystal structure and comprising (1) silicon oxide and (2) boron oxide or a combination of boron oxide and aluminum oxide, iron oxide, titanium oxide, gallium oxide and mixtures thereof; and wherein the mole ratio of silicon oxide to boron oxide in said boron-containing molecular sieve is between 15 and 125. A method for production of light olefins, comprising selecting the catalyst and reacting a feedstock comprising an oxygenate or mixture of oxygenates, at effective conditions, over the catalyst. Also, a method for production of light olefins, comprising selecting the catalyst, selecting the oxygenate feedstock, and reacting the feedstock at effective conditions over the catalyst.Type: ApplicationFiled: November 16, 2007Publication date: May 21, 2009Inventors: Lun-Teh Yuen, Stacey I. Zones
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Publication number: 20090110621Abstract: A boron-containing molecular sieve having the CHA crystal structure and comprising (1) silicon oxide and (2) boron oxide or a combination of boron oxide and aluminum oxide, iron oxide, titanium oxide, gallium oxide and mixtures thereof is prepared using a quaternary ammonium cation derived from 1-adamantamine, 3-quinuclidinol or 2-exo-aminonorbornane as structure directing agent.Type: ApplicationFiled: December 8, 2008Publication date: April 30, 2009Inventors: Lun-Teh Yuen, Stacey I. Zones
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Patent number: 7513935Abstract: The present invention provides a method for preparing silica containing molecular sieves which may be mixed with an organic polymer to create a mixed matrix membrane. Further, this invention includes a method of making such a mixed matrix membrane and the membrane itself. A process for separating component gases from a mixture using the subject mixed matrix membrane is also described. The method for preparing silica containing molecular sieves comprises super water washing silica containing molecular sieves to produce water washed molecular sieves which are substantially free of surface remnants. Super water washing also ideally lowers the concentration of alkali metals in the molecular sieves.Type: GrantFiled: July 6, 2007Date of Patent: April 7, 2009Assignee: Chevron U.S.A. Inc.Inventors: Stephen J. Miller, Lun-Teh Yuen
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Publication number: 20090081099Abstract: Engine exhaust is treated with a molecular sieve having the CHA crystal structure and having a mole ratio of greater than 50 of (1) an oxide selected from silicon oxide, germanium oxide or mixtures thereof to (2) an oxide selected from aluminum oxide, iron oxide, titanium oxide, gallium oxide or mixtures thereof.Type: ApplicationFiled: December 8, 2008Publication date: March 26, 2009Inventor: Lun-Teh Yuen
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Patent number: 7507393Abstract: A boron-containing molecular sieve having the CHA crystal structure and comprising (1) silicon oxide and (2) boron oxide or a combination of boron oxide and aluminum oxide, iron oxide, titanium oxide, gallium oxide and mixtures thereof; and wherein the mole ratio of silicon oxide to boron oxide in said boron-containing molecular sieve is between 15 and 125. Also, a boron-containing molecular sieve, having a CHA crystal structure containing oxides only of (1) silicon and (2) boron; and wherein the mole ratio of silicon oxide to boron oxide in said boron-containing molecular sieve is between 15 and 125.Type: GrantFiled: January 16, 2008Date of Patent: March 24, 2009Assignee: Chevron U. S. A. Inc.Inventors: Lun-Teh Yuen, Stacey I. Zones
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Patent number: 7462744Abstract: A process for producing methylamine or dimethylamine comprising reacting methanol, dimethyl ether or a mixture thereof, and ammonia in the gaseous phase in the presence of a catalyst comprising a boron-containing molecular sieve having the CHA crystal structure; and comprising (1) silicon oxide and (2) boron oxide or a combination of boron oxide and aluminum oxide, iron oxide, titanium oxide, gallium oxide and mixtures thereof; and wherein the mole ratio of silicon oxide to boron oxide in said boron-containing molecular sieve is between 15 and 125. Also a method for producing methylamine or dimethylamine comprising selecting the boron-containing molecular sieve having the CHA crystal structure and the desired mole ratio of silicon oxide to boron oxide and reacting methanol, diemethyl ether or a mixture thereof and ammonia in the presence of the catalyst.Type: GrantFiled: November 16, 2007Date of Patent: December 9, 2008Assignee: Chevron U.S.A. Inc.Inventors: Lun-Teh Yuen, Stacey I. Zones
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Publication number: 20080300425Abstract: A process for producing methylamine or dimethylamine comprising reacting methanol, dimethyl ether or a mixture thereof, and ammonia in the gaseous phase in the presence of a catalyst comprising a boron-containing molecular sieve having the CHA crystal structure; and comprising (1) silicon oxide and (2) boron oxide or a combination of boron oxide and aluminum oxide, iron oxide, titanium oxide, gallium oxide and mixtures thereof; and wherein the mole ratio of silicon oxide to boron oxide in said boron-containing molecular sieve is between 15, and 125. Also a method for producing methylamine or dimethylamine comprising selecting the boron-containing molecular sieve having the CHA crystal structure and the desired mole ratio of silicon oxide to boron oxide and reacting methanol, dimethyl ether or a mixture thereof and ammonia in the presence of the catalyst.Type: ApplicationFiled: November 16, 2007Publication date: December 4, 2008Inventors: Lun-Teh Yuen, Stacey I. Zones
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Publication number: 20080233031Abstract: A boron-containing molecular sieve having the CHA crystal structure and comprising (1) silicon oxide and (2) boron oxide or a combination of boron oxide and aluminum oxide, iron oxide, titanium oxide, gallium oxide and mixtures thereof; and wherein the mole ratio of silicon oxide to boron oxide in said boron-containing molecular sieve is between 15 and 125. Also, a boron-containing molecular sieve, having a CHA crystal structure containing oxides only of (1) silicon and (2) boron; and wherein the mole ratio of silicon oxide to boron oxide in said boron-containing molecular sieve is between 15 and 125.Type: ApplicationFiled: January 16, 2008Publication date: September 25, 2008Inventors: Lun-Teh Yuen, Stacey I. Zones
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Patent number: 7402297Abstract: A method is disclosed for synthesizing high-silica molecular sieves having the CHA crystal structure using a structure directing agent comprising a cation derived from 1-adamantamine, 3-quinuclidinol or 2-exo-aminonorbornane. The synthesis is conducted in the absence of fluorine.Type: GrantFiled: October 25, 2005Date of Patent: July 22, 2008Assignee: Chevron U.S.A. Inc.Inventor: Lun-Teh Yuen
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Publication number: 20080159952Abstract: Disclosed is a method for preparing crystalline small pore molecular sieves, said method comprising (a) preparing a reaction mixture comprising (1) at least one active source of an oxide of a tetravalent element or mixture of tetravalent elements, (2) optionally at least on active source of an oxide of a trivalent element or mixture of trivalent elements, (3) at least one active source of an alkali metal, (4) seed crystals capable of forming the small pore molecular sieve, (5) a structure directing agent capable of forming the small pore molecular sieve, and (6) an amount of water that is not substantially in excess of the amount required to cause and maintain crystallization of the small pore molecular sieve; and (b) heating said reaction mixture at crystallization conditions for sufficient time to form crystallized material containing crystals of the small pore molecular sieve.Type: ApplicationFiled: September 27, 2007Publication date: July 3, 2008Inventors: Stephen J. Miller, Lun-teh Yuen
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Publication number: 20080159950Abstract: Disclosed is a method for preparing crystalline zeolite SSZ-13, said method comprising (a) preparing a reaction mixture comprising (1) at least one active source of an oxide of a tetravalent element or mixture of tetravalent elements, (2) optionally at least on active source of an oxide of a trivalent element or mixture of trivalent elements, (3) at least one active source of an alkali metal, (4) seed crystals of zeolite SSZ-13, (5) benzyl trimethylammonium cation in an amount sufficient to form crystals of zeolite SSZ-13, the benzyl trimethylammonium cation being used in the absence of a 1-adamantammonium cation, and (6) an amount of water that is not substantially in excess of the amount required to cause and maintain crystallization of the small pore zeolite; and (b) heating said reaction mixture at crystallization conditions for sufficient time to form crystallized material containing crystals of SSZ-13.Type: ApplicationFiled: September 27, 2007Publication date: July 3, 2008Inventors: Stephen J. Miller, Lun-teh Yuen
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Publication number: 20080159951Abstract: Disclosed is a method for preparing crystalline zeolite SSZ-13 said method comprising (a) preparing a reaction mixture comprising (1) at least one active source of an oxide of a tetravalent element or mixture of tetravalent elements, (2) optionally at least on active source of an oxide of a trivalent element or mixture of trivalent elements (3) at least one active source of an alkali metal, (4) seed crystals of zeolite SSZ-13, (5) benzyl trimethylammonium cation in an amount sufficient to form crystals of zeolite SSZ-13, the benzyl trimethylammonium, cation being used in the absence of a 1-adamantammonium cation, and (6) an amount of water that is not substantially in excess of the amount required to cause and maintain crystallization of the small pore zeolite; and (b) heating said reaction mixture at crystallization conditions for sufficient time to form crystallized material containing crystals of SSZ-13.Type: ApplicationFiled: September 27, 2007Publication date: July 3, 2008Inventors: Stephen J. Miller, Lun-teh Yuen
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Publication number: 20080095683Abstract: A process for reduction of oxides of nitrogen contained in a gas stream comprising contacting the gas stream with a boron-containing molecular sieve, the boron-containing molecular sieve having the CHA crystal structure and comprising (1) silicon oxide and (2) boron oxide or a combination of boron oxide and aluminum oxide, iron oxide, titanium oxide, gallium oxide and mixtures thereof; and wherein the mole-ratio of silicon oxide to boron oxide in said boron-containing molecular sieve is between 15 and 125. A method for reduction of oxides of nitrogen, comprising a) selecting the boron-containing molecular sieve; and b) contacting a gas stream with the molecular sieve. A method for reduction of oxides, comprising: a) selecting the boron-containing molecular sieve containing a metal or metal ions capable of catalyzing the reduction of the oxides of nitrogen; and b) contacting an exhaust stream of an internal combustion engine with the molecular sieve.Type: ApplicationFiled: November 16, 2007Publication date: April 24, 2008Inventors: Lun-Teh Yuen, Stacey Zones