Patents by Inventor Mei XUE

Mei XUE 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).

  • Patent number: 9138732
    Abstract: Zeolite catalysts and systems and methods for preparing and using zeolite catalysts having the CHA crystal structure are disclosed. The catalysts can be used to remove nitrogen oxides from a gaseous medium across a broad temperature range and exhibit hydrothermal stable at high reaction temperatures. The zeolite catalysts include a zeolite carrier having a silica to alumina ratio from about 15:1 to about 256:1 and a copper to alumina ratio from about 0.25:1 to about 1:1.
    Type: Grant
    Filed: January 16, 2015
    Date of Patent: September 22, 2015
    Assignee: BASF CORPORATION
    Inventors: Ivor Bull, Wen-Mei Xue, Patrick Burk, R. Samuel Boorse, William M. Jaglowski, Gerald Stephen Koermer, Ahmad Moini, Joseph A. Patchett, Joseph C. Dettling, Matthew Tyler Caudle
  • Publication number: 20150174564
    Abstract: A diesel oxidation catalyst for the treatment of exhaust gas emissions, such as the oxidation of unburned hydrocarbons (HC), and carbon monoxide (CO) and the reduction of nitrogen oxides (NOx) is described. More particularly, the present invention is directed to a washcoat composition comprising high silica to alumina zeolite and platinum and palladium such that the zeolite minimizes negative interactions of these platinum group metals with the zeolite.
    Type: Application
    Filed: April 5, 2012
    Publication date: June 25, 2015
    Applicants: BASF Corporation, BASF SE
    Inventors: Torsten W. Müller-Stach, Alfred H. Punke, Gerd Grubert, Marcus Hilgendorff, Helke Doering, Torsten Neubauer, Xiaolai Zheng, Chung-Zong Wan, Wen-Mei Xue, Patrick Burk
  • Publication number: 20150139897
    Abstract: Zeolite catalysts and systems and methods for preparing and using zeolite catalysts having the CHA crystal structure are disclosed. The catalysts can be used to remove nitrogen oxides from a gaseous medium across a broad temperature range and exhibit hydrothermal stable at high reaction temperatures. The zeolite catalysts include a zeolite carrier having a silica to alumina ratio from about 15:1 to about 256:1 and a copper to alumina ratio from about 0.25:1 to about 1:1.
    Type: Application
    Filed: January 16, 2015
    Publication date: May 21, 2015
    Inventors: Ivor Bull, Wen-Mei Xue, Patrick Burk, R. Samuel Boorse, William M. Jaglowski, Gerald Stephen Koermer, Ahmad Moini, Joseph A. Patchett, Joseph C. Dettling, Matthew Tyler Caudle
  • Publication number: 20150132206
    Abstract: Zeolite catalysts and systems and methods for preparing and using zeolite catalysts having the CHA crystal structure are disclosed. The catalysts can be used to remove nitrogen oxides from a gaseous medium across a broad temperature range and exhibit hydrothermal stable at high reaction temperatures. The zeolite catalysts include a zeolite carrier having a silica to alumina ratio from about 15:1 to about 256:1 and a copper to alumina ratio from about 0.25: 1 to about 1:1.
    Type: Application
    Filed: January 16, 2015
    Publication date: May 14, 2015
    Inventors: Ivor Bull, Wen-Mei Xue, Patrick Burk, R. Samuel Boorse, William M. Jaglowski, Gerald Stephen Koermer, Ahmad Moini, Joseph A. Patchett, Joseph C. Dettling, Matthew Tyler Caudle
  • Publication number: 20140360171
    Abstract: A catalyst for the treatment of exhaust gas emissions is disclosed. The catalyst can comprise ceria-alumina particles having a ceria phase present in a weight percent of the composite in the range of about 20% to about 80% on an oxide basis, an alkaline earth metal component supported on the ceria-alumina particles, wherein the CeO2 is present in the form of crystallites that are hydrothermally stable and have an average crystallite size less than 160 ? after aging at 950° C. for 5 hours in 2% O2 and 10% steam in N2.
    Type: Application
    Filed: August 25, 2014
    Publication date: December 11, 2014
    Inventors: Wen-Mei Xue, Xinyi Wei, Marcus Hilgendorff, Patrick Burk
  • Patent number: 8906330
    Abstract: The present invention relates to a catalyst composition comprising a carrier substrate, a layer (i) coated on said carrier substrate comprising at least one precious group metal, a layer (ii) comprising Rh, and a layer (iii) comprising Pd and/or Pt and being substantially free of Ce, Ba and Rh, wherein the layer (iii) has a lower weight than the layer (i) or the layer (ii). Furthermore, the present invention relates to a method for treating an exhaust gas stream using said catalyst composition.
    Type: Grant
    Filed: May 4, 2010
    Date of Patent: December 9, 2014
    Assignee: BASF Corporation
    Inventors: Marcus Hilgendorff, Wen Mei Xue, Cesar Tolentino
  • Publication number: 20140260214
    Abstract: A lean NOx trap for the treatment of exhaust gas emissions, such as the oxidation of unburned hydrocarbons (HC), and carbon monoxide (CO), and the trapping and reduction of nitrogen oxides (NOx) is disclosed. Nitrogen oxide storage catalysts can comprise a layer on a substrate including ceria-alumina particles having a ceria phase present in a weight percent of the composite in the range of about 20% to about 80% on an oxide basis, an alkaline earth metal component supported on the ceria-alumina particles, wherein the CeO2 is present in the form of crystallites that are hydrothermally stable and have an average crystallite size less than 130 ? after aging at 950° C. for 5 hours in 2% O2 and 10% steam in N2.
    Type: Application
    Filed: March 11, 2014
    Publication date: September 18, 2014
    Applicant: BASF Corporation
    Inventors: Wen-Mei Xue, Xinyi Wei, Marcus Hilgendorff, Patrick Burk
  • Publication number: 20140219879
    Abstract: Zeolite catalysts and systems and methods for preparing and using zeolite catalysts having the CHA crystal structure are disclosed. The catalysts can be used to remove nitrogen oxides from a gaseous medium across a broad temperature range and exhibit hydrothermal stable at high reaction temperatures. The zeolite catalysts include a zeolite carrier having a silica to alumina ratio from about 15:1 to about 256:1 and a copper to alumina ratio from about 0.25:1 to about 1:1.
    Type: Application
    Filed: April 4, 2014
    Publication date: August 7, 2014
    Applicant: BASF Corporation
    Inventors: Ivor Bull, Wen-Mei Xue, Patrick Burk, R. Samuel Boorse, William M. Jaglowski, Gerald Stephen Koermer, Ahmad Moini, Joseph A. Patchett, Joseph C. Dettling, Matthew Tyler Caudle
  • Patent number: 8735311
    Abstract: Zeolite catalysts and systems and methods for preparing and using zeolite catalysts having the CHA crystal structure are disclosed. The catalysts can be used to remove nitrogen oxides from a gaseous medium across a broad temperature range and exhibit hydrothermal stable at high reaction temperatures. The zeolite catalysts include a zeolite carrier having a silica to alumina ratio from about 15:1 to about 256:1 and a copper to alumina ratio from about 0.25:1 to about 1:1.
    Type: Grant
    Filed: March 8, 2013
    Date of Patent: May 27, 2014
    Assignee: BASF Corporation
    Inventors: Ivor Bull, Wen-Mei Xue, Patrick Burk, R. Samuel Boorse, William M. Jaglowski, Gerald Stephen Koermer, Ahmad Moini, Joseph A. Patchett, Joseph C. Dettling, Matthew Tyler Caudle
  • Publication number: 20130189173
    Abstract: The present invention relates to a catalyst composition comprising a carrier substrate, a layer (i) coated on said carrier substrate comprising at least one precious group metal, a layer (ii) comprising Rh, and a layer (iii) comprising Pd and/or Pt and being substantially free of Ce, Ba and Rh, wherein the layer (iii) has a lower weight than the layer (i) or the layer (ii). Furthermore, the present invention relates to a method for treating an exhaust gas stream using said catalyst composition.
    Type: Application
    Filed: May 4, 2010
    Publication date: July 25, 2013
    Inventors: Marcus Hilgendorff, Wen Mei Xue, Cesar Tolentino
  • Patent number: 8404203
    Abstract: Zeolite catalysts and systems and methods for preparing and using zeolite catalysts having the CHA crystal structure are disclosed. The catalysts can be used to remove nitrogen oxides from a gaseous medium across a broad temperature range and exhibit hydrothermal stable at high reaction temperatures. The zeolite catalysts include a zeolite carrier having a silica to alumina ratio from about 15:1 to about 256:1 and a copper to aluminum ratio from about 0.25:1 to about 1:1.
    Type: Grant
    Filed: June 8, 2009
    Date of Patent: March 26, 2013
    Assignee: BASF Corporation
    Inventors: Ivor Bull, Wen-Mei Xue, Patrick Burk, R. Samuel Boorse, William M. Jaglowski, Gerald S. Koermer, Ahmad Moini, Joseph A. Patchett, Joseph C. Dettling, Matthew T. Caudle
  • Publication number: 20100301951
    Abstract: A current controlled ring oscillator and a method for controlling the same are provided. The current controlled ring oscillator includes a charge pump (CP), a loop filter (LF), a voltage-current (V-I) converter, and an oscillation unit. The CP is used to provide a charging/discharging current. The LF is coupled to the CP, and is used to provide a control voltage. The V-I converter is coupled to the CP, and is used to convert the control voltage to a control current. The oscillation unit includes a plurality of current controlled delay cells serially connected to one another as a ring, and the oscillation unit is coupled to the V-I converter, and controlled by the control current to generate an oscillation signal.
    Type: Application
    Filed: May 26, 2010
    Publication date: December 2, 2010
    Inventor: Hai Mei XUE
  • Patent number: 7722845
    Abstract: Catalysts, methods, and systems for treating diesel engine exhaust streams are described. In one or more embodiments, the catalyst comprises platinum, a second metal from one of the groups VB, VIB, VIIB, VIIIB, IB, or IIB of the periodic table, a refractory metal oxide, and a zeolite, the oxidation catalyst already being effective to remove ammonia at temperatures less than about 300° C. and exhibiting no significant decrease in ammonia oxidation efficiency upon hydrothermal aging. A method aspect includes first passing a vehicle's engine exhaust stream through a NOx abatement catalyst; and passing the exhaust stream exiting the NOx abatement catalyst and containing ammonia through the ammonia oxidation catalyst. Systems including such catalysts are also provided.
    Type: Grant
    Filed: February 27, 2008
    Date of Patent: May 25, 2010
    Assignee: Basf Corporation
    Inventors: Matthew T. Caudle, Martin Deiterle, Stanley A. Roth, Wen-Mei Xue
  • Publication number: 20090285737
    Abstract: Zeolite catalysts and systems and methods for preparing and using zeolite catalysts having the CHA crystal structure are disclosed. The catalysts can be used to remove nitrogen oxides from a gaseous medium across a broad temperature range and exhibit hydrothermal stable at high reaction temperatures. The zeolite catalysts include a zeolite carrier having a silica to alumina ratio from about 15:1 to about 256:1 and a copper to alumina ratio from about 0.25:1 to about 1:1.
    Type: Application
    Filed: June 8, 2009
    Publication date: November 19, 2009
    Applicant: BASF Catalysts LLC
    Inventors: Ivor Bull, Wen-Mei Xue, Patrick Burk, R. Samuel Boorse, William M. Jaglowski, Gerald S. Koermer, Ahmad Moini, Joseph A. Patchett, Joseph C. Dettling, Matthew T. Caudle
  • Patent number: 7601662
    Abstract: Zeolite catalysts and systems and methods for preparing and using zeolite catalysts having the CHA crystal structure are disclosed. The catalysts can be used to remove nitrogen oxides from a gaseous medium across a broad temperature range and exhibit hydrothermal stable at high reaction temperatures. The zeolite catalysts include a zeolite carrier having a silica to alumina ratio from about 15:1 to about 256:1 and a copper to alumina ratio from about 0.25:1 to about 1:1.
    Type: Grant
    Filed: February 27, 2008
    Date of Patent: October 13, 2009
    Assignee: BASF Catalysts LLC
    Inventors: Ivor Bull, Wen-Mei Xue, Patrick Burk, R. Samuel Boorse, William M. Jaglowski, Gerald S. Koermer, Ahmad Moini, Joseph A. Patchett, Joseph C. Dettling, Matthew T. Caudle
  • Publication number: 20080292519
    Abstract: Catalysts, methods, and systems for treating diesel engine exhaust streams are described. In one or more embodiments, the catalyst comprises platinum, a second metal from one of the groups VB, VIIB, VIIB, VIIIB, IB, or IIB of the periodic table, a refractory metal oxide, and a zeolite, the oxidation catalyst already being effective to remove ammonia at temperatures less than about 300° C. and exhibiting no significant decrease in ammonia oxidation efficiency upon hydrothermal aging. A method aspect includes first passing a vehicle's engine exhaust stream through a NOx abatement catalyst; and passing the exhaust stream exiting the NOx abatement catalyst and containing ammonia through the ammonia oxidation catalyst. Systems including such catalysts are also provided.
    Type: Application
    Filed: February 27, 2008
    Publication date: November 27, 2008
    Inventors: Matthew T. Caudle, Martin Deiterle, Stanley A. Roth, Wen-Mei Xue
  • Publication number: 20080226545
    Abstract: Zeolite catalysts and systems and methods for preparing and using zeolite catalysts having the CHA crystal structure are disclosed. The catalysts can be used to remove nitrogen oxides from a gaseous medium across a broad temperature range and exhibit hydrothermal stable at high reaction temperatures. The zeolite catalysts include a zeolite carrier having a silica to alumina ratio from about 15:1 to about 256:1 and a copper to alumina ratio from about 0.25:1 to about 1:1.
    Type: Application
    Filed: February 27, 2008
    Publication date: September 18, 2008
    Inventors: Ivor Bull, R. Samuel Boorse, William M. Jaglowski, Gerald S. Koermer, Ahmad Moini, Joseph A. Patchett, Wen-Mei Xue, Patrick Burk, Joseph C. Dettling, Matthew T. Caudle