Patents by Inventor Karl C. C. Kharas

Karl C. C. Kharas 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: 7297656
    Abstract: In one embodiment, a particulate filter includes a housing and a substrate disposed within the housing, the substrate comprising a catalyst composition comprising a single crystalline phase multiple metal oxide comprising platinum, wherein the substrate is designed such that gas flowing through the substrate, passes through a walls in the substrate prior to exiting the substrate.
    Type: Grant
    Filed: December 12, 2003
    Date of Patent: November 20, 2007
    Assignee: Umicore AG & Co. KG
    Inventors: Wenzhong Zhang, Karl C. C. Kharas
  • Publication number: 20040126287
    Abstract: In one embodiment, a particulate filter includes a housing and a substrate disposed within the housing, the substrate comprising a catalyst composition comprising a single crystalline phase multiple metal oxide comprising platinum, wherein the substrate is designed such that gas flowing through the substrate, passes through a walls in the substrate prior to exiting the substrate.
    Type: Application
    Filed: December 12, 2003
    Publication date: July 1, 2004
    Inventors: Wenzhong Zhang, Karl C. C. Kharas
  • Patent number: 6592833
    Abstract: A method of NOx abatement comprising the steps of generating a gas stream containing hydrocarbons and NOx, maintaining the temperature of the gas stream within the range of about 150° C. to about 550° C., maintaining the residence time of said hydrocarbons upstream of a NOx abatement catalyst so as to reduce the rate of hydrocarbon oxidation, and contacting the gas stream with said NOx abatement catalyst.
    Type: Grant
    Filed: October 18, 1999
    Date of Patent: July 15, 2003
    Assignee: Delphi Technologies, Inc.
    Inventor: Karl C. C. Kharas
  • Patent number: 6365118
    Abstract: A process for removal of carbon monoxide, hydrocarbons, and nitrogen oxides from the exhaust gas from lean-burn, diesel and other engines which produce exhaust gases containing excess oxygen is disclosed. An exhaust gas from an engine operating at an air-fuel ratio above about 18 is contacted with a multi-component catalyst having at least two catalytic components, each capable of reducing nitrogen oxides within a range of exhaust gas temperatures that is different from the range of exhaust gas temperatures within which each other component is capable of reducing nitrogen oxides. Oxidation of the remaining reducing gases is also accomplished. One example of a two catalytic component catalyst of this invention has a first component of Au supported on alumina, which reduces nitrogen oxides at exhaust gas temperatures between about 600° C. and 900° C., and a second component of Pt supported on Y-zeolite, which reduces nitrogen oxides at exhaust gas temperatures below 600° C.
    Type: Grant
    Filed: August 31, 1999
    Date of Patent: April 2, 2002
    Assignee: Delphi Technologies, Inc.
    Inventors: Karl C. C. Kharas, Heinz J. Robota
  • Patent number: 6235255
    Abstract: The present invention relates to catalyst support comprising an inorganic oxide, preferably alumina, and zeolite in the proton form and having a high Si/Al ratio, wherein the zeolite is selected from those protonated zeolites that would exhibit a high Na/Al mole ratio if treated with a solution of sodium nitrate until all sites that will accept a sodium ion have done so. This invention also relates to catalyst that is made from such support, to a method of treating exhaust gas from “lean-burn” engines using catalyst of this invention, and to a method for determining if a zeolite is a suitable support component.
    Type: Grant
    Filed: May 21, 1999
    Date of Patent: May 22, 2001
    Assignee: ASEC Manufacturing
    Inventor: Karl C. C. Kharas
  • Patent number: 6127300
    Abstract: A catalytic converter for treating exhaust gas from an internal combustion engine containing a catalyst characterized by having platinum or a platinum alloy dispersed predominantly on the exterior surface of molecular sieve crystals. Also provided is a catalyst for such a converter and processes for manufacture of such catalyst. In addition, methods for treating exhaust gas from an internal combustion engine to reduce the amounts of hydrocarbon, carbon monoxide and nitrogen oxides emitted to the atmosphere are included.
    Type: Grant
    Filed: January 22, 1998
    Date of Patent: October 3, 2000
    Assignee: ASEC Manufacturing General Partnership
    Inventors: Karl C. C. Kharas, Heinz J. Robota
  • Patent number: 6087295
    Abstract: Removal of carbon monoxide, hydrocarbons, and nitrogen oxides from the exhaust gas from lean-burn, diesel and other engines which produce exhaust gases containing excess oxygen is provided by a multi-component catalyst having at least two catalytic components, each capable of reducing nitrogen oxides within a range of exhaust gas temperatures that is different from the range of exhaust gas temperatures within which each other component is capable of reducing nitrogen oxides. Oxidation of the remaining reducing gases is also accomplished. One example of a two catalytic component catalyst of this invention has a first component of Au supported on alumina, which reduces nitrogen oxides at exhaust gas temperatures between about 600.degree. C. and 900.degree. C., and a second component of Pt supported on Y-zeolite, which reduces nitrogen oxides at exhaust gas temperatures below 600.degree. C.; an example of a three catalytic component catalyst of this invention has a first component of CoO supported on .gamma.
    Type: Grant
    Filed: June 30, 1998
    Date of Patent: July 11, 2000
    Assignee: ASEC Manufacturing
    Inventors: Karl C. C. Kharas, Heinz J. Robota
  • Patent number: 5980844
    Abstract: An SO.sub.2 -tolerant catalyst for reducing NO.sub.x, in exhaust gas from internal combustion, wherein the exhaust gas contains unburnt hydrocarbons and oxygen comprising silver oxide dispersed on alumina characterized in that such catalyst is white in color.
    Type: Grant
    Filed: April 9, 1998
    Date of Patent: November 9, 1999
    Assignee: ASEC Manufacturing
    Inventor: Karl C. C. Kharas
  • Patent number: 5977012
    Abstract: Removal of carbon monoxide, hydrocarbons, and nitrogen oxides from the exhaust gas from lean-burn, diesel and other engines which produce exhaust gases containing oxygen in substantial excess of stoichiometric is provided by catalysts containing platinum alloyed with cobalt, nickel, copper, rhodium, palladium, silver or gold. Alloying is accomplished by thermal treatment or by colloidal methods. The catalysts are capable of reducing nitrogen oxides (NO.sub.x) within a predetermined range of engine operating temperatures.
    Type: Grant
    Filed: June 5, 1998
    Date of Patent: November 2, 1999
    Assignee: ASEC Manufacturing General Partnership
    Inventors: Karl C. C. Kharas, Heinz J. Robota, John G. Nunan, Michael G. Henk
  • Patent number: 5972820
    Abstract: Methods of making substantially phase-pure and thermally stable crystalline alumina compositions stabilized with an oxide of silicon, germanium, phosphorus, arsenic or a mixture thereof. Also provided are crystalline alumina compositions and catalyst supports made using these methods.
    Type: Grant
    Filed: January 19, 1999
    Date of Patent: October 26, 1999
    Assignee: ASEC Manufacturing, a General Partnership
    Inventors: Karl C. C. Kharas, Roy T. Mitsche, Heinz J. Robota, Michael G. Gatter
  • Patent number: 5968466
    Abstract: A process for the removal of carbon monoxide, hydrocarbons, and nitrogen oxides in an oxidizing exhaust gas comprising contacting the exhaust gas with a catalyst comprising a crystalline zeolite having the following characteristics:a) a Si/Al atomic ratio between 5 and 100;b) a pore size in the range of from about 0.5 to about 1.3 nm;c) essentially no octahedral aluminum detectable by .sub.27 Al NMR spectroscopy;d) a sodium ion exchange capacity, with regard to total aluminum content, of greater than 75%;e) a copper content in the range of from about 0.5 wt. % to about 12 wt. %; andf) a silver content in the range of from about 0.25 wt. % to about 20 wt. %.
    Type: Grant
    Filed: May 28, 1996
    Date of Patent: October 19, 1999
    Assignee: ASEC Manufacturing
    Inventor: Karl C. C. Kharas
  • Patent number: 5908806
    Abstract: A catalyst for the removal of carbon monoxide, hydrocarbons and nitrogen oxides in an exhaust gas made by a process comprising:a) preparing a suspension comprising a liquid, a zeolite, a weak base, and salts of copper and silver,said zeolite being crystalline and having a Si/Al atomic ratio between about 5 and about 100, a pore size between about 0.5 nm and about 1.3 nm, essentially no octahedral aluminum detectable by .sup.27 Al NMR spectroscopy and a sodium ion exchange capacity, with regard to total aluminum content, greater than 75%, and wherein said suspension contains sufficient amounts of said copper and silver salts to result in a copper content in said catalyst, when finished, between about 0.5 wt. % and about 12 wt. % and a silver content between about 0.25 wt. % and about 20 wt.
    Type: Grant
    Filed: May 16, 1997
    Date of Patent: June 1, 1999
    Assignee: ASEC Manufacturing
    Inventor: Karl C. C. Kharas
  • Patent number: 5897846
    Abstract: A catalytic converter for treating exhaust gas from an internal combustion engine containing a catalyst characterized by having platinum or a platinum alloy dispersed predominately on the exterior surface of molecular sieve crystals. Also provided is a catalyst for such a converter and processes for manufacture of such catalyst. In addition, a process for treating exhaust gas from an internal combustion engine to reduce the amounts of hydrocarbon, carbon monoxide and nitrogen oxides emitted to the atmosphere is included.
    Type: Grant
    Filed: January 27, 1997
    Date of Patent: April 27, 1999
    Assignee: ASEC Manufacturing
    Inventors: Karl C. C. Kharas, Heinz J. Robota
  • Patent number: 5894068
    Abstract: Removal of carbon monoxide, hydrocarbons, and nitrogen oxides from the exhaust gas from lean-burn, diesel and other engines which produce exhaust gases containing excess oxygen is provided by at least two catalysts in sequence, each capable of reducing nitrogen oxides within a particular range of engine operating temperatures. Oxidation of the remaining reducing gases is also accomplished.
    Type: Grant
    Filed: December 14, 1992
    Date of Patent: April 13, 1999
    Inventors: Karl C. C. Kharas, Michael George Henk, Heinz Juergen Robota
  • Patent number: 5877106
    Abstract: New thermally- and hydrothermally-stable .delta.-alumina compositions stabilized with an oxide of silicon, germanium, phosphorus, arsenic or a mixture thereof and methods of preparation of same are provided. Also provided are catalyst supports and catalysts made using these stabilized .delta.-alumina compositions, methods for making same, and methods for treating the exhaust gas from an internal combustion engine using such catalysts.
    Type: Grant
    Filed: January 3, 1997
    Date of Patent: March 2, 1999
    Assignee: ASEC Manufacturing
    Inventors: Karl C. C. Kharas, Roy T. Mitsche, Heinz J. Robota, Michael G. Gatter
  • Patent number: 5389589
    Abstract: The present invention is a barium-containing alumina with the X-ray pattern of the FIGURE. The alumina may be synthesized by simultaneously adding a polyether or a polyalcohol and an aqueous solution of a water soluble barium carboxylate to an aqueous boehmite sol or suspension to form a gel, the gel having a polyether or polyalcohol content of about 2 wt. % to about 26 wt. %, preferably about 10 wt. % to about 20 wt. %. The gel is then dried and calcined to convert it to an essentially pure barium-containing delta alumina. The alumina may be optionally hydrothermally treated to induce further crystallization. The final product contains about 2 wt. % to about 18 wt. % Ba, preferably about 8 wt. % to about 12 wt. %.
    Type: Grant
    Filed: December 22, 1992
    Date of Patent: February 14, 1995
    Assignee: Allied-Signal Inc.
    Inventor: Karl C. C. Kharas