Patents by Inventor Louis Hegedus

Louis Hegedus 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: 5137855
    Abstract: Catalysts for the selective catalytic reduction of NOx by ammonia are made from porous formed supports having a certain fraction of the pores with pore diameters larger than 600 Angstrom units. Thus macropores can be introduced in a formed TiO.sub.2 support by adding burnout materials prior to forming the titania into the formed support. Then conventional DeNOx catalytic metals are added. Barium sulfate can be added to the surface of the porous inorganic oxide to make an improved support.
    Type: Grant
    Filed: September 21, 1989
    Date of Patent: August 11, 1992
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Louis Hegedus, Jean W. Beeckman, Wie-Hin Pan, Jeffrey P. Solar
  • Patent number: 4975256
    Abstract: Catalysts for the selective catalytic reduction of NOx by ammonia are made from porous formed supports having a certain fraction of the pores with pore diameters larger than 600 Angstrom units. Thus macropores can be introduced in a formed TiO.sub.2 support by adding burnout materials or some inorganic oxide prior to forming the titania into the formed support. Alternatively, titania is precipitated onto a porous inorganic oxide such as SiO.sub.2, Al.sub.2 O.sub.3, ZrO.sub.2, AlPO.sub.4, Fe.sub.2 O.sub.3 and B.sub.2 O.sub.3 to form the support. Then conventional DeNOx catalytic metals are added. The support can be made by first impregnating the inorganic oxide particles with titania via a soluble precursor, forming titania and then shaping the coated particles into the desired shape such as a monolith. In a second embodiment, the inorganic oxide particles are first formed into the desired shape and then impregnated with the titania forming material.
    Type: Grant
    Filed: October 4, 1989
    Date of Patent: December 4, 1990
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Louis Hegedus, Jean W. Beeckman, Wie-Hin Pan, Jeffrey P. Solar
  • Patent number: 4929586
    Abstract: Catalysts for the selective catalytic reduction of NOx by ammonia are made from porous formed supports having a certain fraction of the pores with pore diameters larger than 600 Angstrom units. Thus macropores can be introduced in a formed TiO.sub.2 support by adding burnout materials or some inorganic oxide prior to forming the titania into the formed support. Alternatively, titania is precipitated onto a porous inorganic oxide such as SiO.sub.2, Al.sub.2 O.sub.3, ZrO.sub.2, AlPO.sub.4, Fe.sub.2 O.sub.3 and B.sub.2 O.sub.3 to form the support. Then conventional DeNOx catalytic metals are added. The support can be made by first impregnating the inorganic oxide particles with titania via a soluble precursor, forming titania and then shaping the coated particles into the desired shape such as a monolith. In a second embodiment, the inorganic oxide particles are first formed into the desired shape and then impregnated with the titania forming material.
    Type: Grant
    Filed: June 9, 1988
    Date of Patent: May 29, 1990
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Louis Hegedus, Jean W. Beeckman, Wie-Hin Pan, Jeffrey P. Solar
  • Patent number: 4859433
    Abstract: An optimum washcoated ceramic monolith for treating automotive exhaust gases is made by(a) specifying the reactants, process conditions and desired time on stream;(b) determining from the parameters in step (a) the pore size distribution and thickness of the washcoat to produce the desired auto exhaust conversion;(c) preparing a washcoat catalyst with an alumina having the desired pore size distribution; and(d) applying the prepared washcoat catalyst to a ceramic or metal monolith to produce a finished automotive exhaust gas catalyst.Following this process the optimized washcoated catalyst can then be used to treat automotive exhaust gases.
    Type: Grant
    Filed: May 25, 1988
    Date of Patent: August 22, 1989
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Carmo J. Pereira, Joseph E. Kubsh, Louis Hegedus
  • Patent number: 4771029
    Abstract: An optimum washcoated ceramic monolith for treating automotive exhaust gases is made by(a) specifying the reactants, process conditions and desired time on stream;(b) determining from the parameters in step (a) the pore size distribution and thickness of the washcoat to produce the desired auto exhaust conversion;(c) preparing a washcoat catalyst with an alumina having the desired pore size distribution; and(d) applying the prepared washcoat catalyst to a ceramic or metal monolith to produce a finished automotive exhaust gas catalyst. Following this process the optimized washcoated catalyst can then be used to treat automotive exhaust gases.
    Type: Grant
    Filed: May 18, 1987
    Date of Patent: September 13, 1988
    Assignee: W. R. Grace & Co.-Conn
    Inventors: Carmo J. Pereira, Joseph E. Kubsh, Louis Hegedus
  • Patent number: 4643806
    Abstract: Oxidation reactions and unsaturation producing reactions are disclosed to be carried out in a solid-state electrocatalytic reactor for electrolytic energy conversion and chemicals production. Additional reactions are disclosed to be carried out in a solid-state electrocatalytic cross flow monolith which has a high ion transport surface area per reactor volume. The additional reactions include selected oxidation reactions, selected addition reactions, electrolysis of steam to hydrogen, decomposition of nitric oxide to nitrogen and oxygen and the manufacture of aluminum from Al.sub.2 O.sub.3 in a eutectic solution.
    Type: Grant
    Filed: October 3, 1983
    Date of Patent: February 17, 1987
    Assignees: W. R. Grace & Co., Massachusetts Institute of Technology
    Inventors: Louis Hegedus, Costas G. Vayenas, James N. Michaels
  • Patent number: 4541996
    Abstract: An extrudate catalyst suitable for auto emission control is made from a solid, transitional alumina. It has a partially hollow interior and one or more platinum group metals deposited on the extrudate. The cylindrical extrudate has internal reinforcing vanes or ribs extending from the inner wall to the center of the extrudate particle. This configuration permits the catalyst to have the large geometric surface area per reactor volume yet, because of the openings inside the extrudate, the catalyst particles do not exhibit a large pressure drop when packed in a deep bed. These catalysts provide greater hydrocarbon and carbon monoxide conversions than do similar size spherical particles and they have improved light-off characteristics.
    Type: Grant
    Filed: November 13, 1984
    Date of Patent: September 17, 1985
    Assignee: W. R. Grace & Co.
    Inventors: Carmo J. Pereira, Louis Hegedus, James M. Maselli
  • Patent number: 4541995
    Abstract: An extrudate catalyst suitable for auto emission control is made from a solid, transitional alumina with a partially hollow interior. Deposited on the extrudate are two promoters, ceria and an alkali metal, and one or more platinum group metals. The preferred alkali metal is in the oxide form as lithia. The cylindrical extrudate has internal reinforcing vanes or ribs extending from the inner wall to the center of the extrudate particle. This configuration permits the catalyst to have the large geometric surface area per reactor volume yet, because of the openings inside the extrudate, the catalyst particles do not exhibit a large pressure drop when packed in a deep bed. These catalysts provide greater hydrocarbon and carbon monoxide conversions than do similar size spherical particles and they have improved light-off characteristics.
    Type: Grant
    Filed: November 13, 1984
    Date of Patent: September 17, 1985
    Assignee: W. R. Grace & Co.
    Inventors: Gwan Kim, Carmo J. Pereira, Louis Hegedus, James M. Maselli
  • Patent number: 4510263
    Abstract: An extrudate suitable for improved gas/liquid contacting is made from a solid, transitional alumina. The cylindrical extrudate has a partially hollow interior and internal reinforcing vanes or ribs extending from the inner wall to the center of the extrudate particle. This extrudate configuration permits the extrudate to have the large geometric surface area per reactor volume yet, because of the openings inside the extrudate, the particles do not exhibit a large pressure drop when packed in a deep bed. One or more Group VI and Group VIII metals can be impregnated to form a catalyst which provides superior desulfurization and demetallization activity than do similar size particles.
    Type: Grant
    Filed: October 17, 1983
    Date of Patent: April 9, 1985
    Assignee: W. R. Grace & Co.
    Inventors: Carmo J. Pereira, Louis Hegedus
  • Patent number: 4510262
    Abstract: An extrudate catalyst suitable for auto emission control is made from a solid, transitional aluminia with a partially hollow interior. Deposited on the extrudate are two promoters, ceria and an alkali metal, and one or more platinum group metals. The preferred alkali metal is in the oxide form as lithia. The cylindrical extrudate has internal reinforcing vanes or ribs extending from the inner wall to the center of the extrudate particle. This configuration permits the catalyst to have the large geometric surface area per reactor volume yet, because of the openings inside the extrudate, the catalyst particles do not exhibit a large pressure drop when packed in a deep bed. These catalysts provide greater hydrocarbon and carbon monoxide conversions than do similar size spherical particles and they have improved light-off characteristics.
    Type: Grant
    Filed: October 17, 1983
    Date of Patent: April 9, 1985
    Assignee: W. R. Grace & Co.
    Inventors: Gwan Kim, Carmo J. Pereira, Louis Hegedus, James M. Maselli
  • Patent number: 4510261
    Abstract: An extrudate catalyst suitable for auto emission control is made from a solid, transitional alumina. It has a partially hollow interior and one or more platinum group metals deposited on the extrudate. The cylindrical extrudate has internal reinforcing vanes or ribs extending from the inner wall to the center of the extrudate particle. This configuration permits the catalyst to have the large geometric surface area per reactor volume yet, because of the openings inside the extrudate, the catalyst particles do not exhibit a large pressure drop when packed in a deep bed. These catalysts provide greater hydrocarbon and carbon monoxide conversions than do similar size spherical particles and they have improved light-off characteristics.
    Type: Grant
    Filed: October 17, 1983
    Date of Patent: April 9, 1985
    Assignee: W. R. Grace & Co.
    Inventors: Carmo J. Pereira, Louis Hegedus, James M. Maselli
  • Patent number: 4463065
    Abstract: Disclosed herein are ribbed catalyst-coated solid-state electrolyte sheets as well as a method for producing such sheets. Also disclosed is a fuel cell reactor comprising a plurality of said sheets stacked one upon another and cemented together to form a monolithic structure. Novel reactions utilizing the reactor to produce useful chemical oxidation products and/or electricity are set forth. Also disclosed is a novel wiring system to collect electrical power generated by the reactor.
    Type: Grant
    Filed: February 2, 1982
    Date of Patent: July 31, 1984
    Assignees: W. R. Grace & Co., Massachusetts Institute of Technology
    Inventors: Louis Hegedus, Costas G. Vayenas, James N. Michaels
  • Patent number: 4413041
    Abstract: Disclosed herein are ribbed catalyst-coated solid-state electrolyte sheets as well as a method for producing such sheets. Also disclosed is a fuel cell reactor comprising a plurality of said sheets stacked one upon another and cemented together to form a monolithic structure. Novel reactions utilizing the reactor to produce useful chemical oxidation products and/or electricity are set forth. Also disclosed is a novel wiring system to collect electrical power generated by the reactor.
    Type: Grant
    Filed: February 2, 1982
    Date of Patent: November 1, 1983
    Assignee: W. R. Grace & Co.
    Inventor: Louis Hegedus
  • Patent number: 4396480
    Abstract: Disclosed herein are ribbed catalyst-coated solid-state electrolyte sheets as well as a method for producing such sheets. Also disclosed is a fuel cell reactor comprising a plurality of said sheets stacked one upon another and cemented together to form a monolithic structure. Novel reactions utilizing the reactor to produce useful chemical oxidation products and/or electricity are set forth. Also disclosed is a novel wiring system to collect electrical power generated by the reactor.
    Type: Grant
    Filed: February 2, 1982
    Date of Patent: August 2, 1983
    Assignee: W. R. Grace & Co.
    Inventors: Louis Hegedus, Christian B. Lundsager
  • Patent number: 4346557
    Abstract: A composite exhaust filter particularly for use in diesel engine powered vehicles includes first and second filter sections disposed in series. The first filter section is a high-temperature depth-type filter material capable of collecting exhaust particulates with moderate efficiency while the second filter section is a high-temperature ceramic wall-flow monolith capable of collecting exhaust particulates on an extended gas porous surface with high efficiency. The vehicle system is provided with means such as an inlet throttle for increasing exhaust gas temperature to the ignition point of the collected particulates. Combustion initiated in the depth type first filter section generates a substantial amount of added heat which is carried to the second filter section, raising the surface temperature to a point where the particulates in the latter section are also incinerated.
    Type: Grant
    Filed: May 7, 1980
    Date of Patent: August 31, 1982
    Assignee: General Motors Corporation
    Inventors: Farhang Shadman, Louis Hegedus
  • Patent number: 4329844
    Abstract: A diesel exhaust particulate filter contains a high temperature depth type filter material arranged in a reflexive path throughout which diesel particulates are collected from engine exhaust gases passed therethrough. Upstream and downstream portions of the filter flow path are disposed in heat exchange relation. Upon heating of the incoming gases to the incineration temperature of collected particulates, the heat of combustion in the downstream portion will be partially transferred to the upstream portion, providing more even temperature levels and improving balance of the incineration process.
    Type: Grant
    Filed: May 16, 1980
    Date of Patent: May 18, 1982
    Assignee: General Motors Corporation
    Inventors: Farhang Shadman, Louis Hegedus
  • Patent number: 4222236
    Abstract: A method for decreasing CO and HC emissions in a vehicle exhaust stream during the period of engine warm-up following the start of engine operation, in which the A/F mixture to the engine is pulsed by first using a mixture which is leaner than that otherwise used thus reducing the CO and HC content of the exhaust stream exiting the engine to an amount below that of the CO and HC otherwise present and then using an A/F mixture which is richer than such lean mixture and is substantially that otherwise used thus increasing the amount of CO and HC in the vehicle exhaust stream to substantially the amount otherwise present, passing the pulsed exhaust stream through a catalytic converter adapted to oxidize the CO and HC constituents, and repeating this pulsing continuously through the period of engine warm-up and at a rate sufficient to achieve increased catalytic conversion of CO and HC over that obtained without pulsing, the rate being also sufficiently rapid so as to preclude engine-stall.
    Type: Grant
    Filed: June 19, 1978
    Date of Patent: September 16, 1980
    Assignee: General Motors Corporation
    Inventors: Louis Hegedus, Se H. Oh, Kenneth Baron
  • Patent number: 4199477
    Abstract: The method for obtaining a tightly adherent, uniformly dispersed porous wash coat by the use of dilute aqueous hydrofluoric acid, 1-5% HF, as an etchant for refractory low porosity catalytic monolith supports to produce substantial improvement of the adhesion, dispersion and uptake characteristics of such supports for porous wash coats. The application of an ultrasonic energy field to the etchant bath greatly accelerates the etching process.
    Type: Grant
    Filed: March 27, 1975
    Date of Patent: April 22, 1980
    Assignee: General Motors Corporation
    Inventor: Louis Hegedus
  • Patent number: 4153579
    Abstract: A three-way layered catalyst for use in a stoichiometric air/fuel ratio system comprising an alumina support having deposited thereon the catalyst materials platinum, palladium and rhodium and having a first layer of platinum positioned at the support surface, a second layer of catalyst material selected from the group consisting of rhodium and a mixture of palladium and rhodium adjacent to and radially inward of the first layer with palladium inward of and adjacent to said second layer where the catalyst material of such layer is rhodium. Cerium oxide may be added to the support for improved performance.
    Type: Grant
    Filed: February 6, 1978
    Date of Patent: May 8, 1979
    Assignee: General Motors Corporation
    Inventors: Jack C. Summers, Louis Hegedus
  • Patent number: 4152301
    Abstract: A layered catalyst having significantly improved performance characteristics including greater resistance to poisoning and sintering in automotive exhaust comprising an alumina support having a first layer of platinum positioned at the support surface and penetrating the body thereof to a desired depth with a second layer of at least one of the catalytically active materials selected from the group consisting of rhodium and palladium, the second layer being adjacent to the first layer and penetrating the body of the support for a depth beyond that of the first layer, maximum concentration of platinum being in the first layer together with minimum concentration of the catalytically active materials, and minimum concentration of platinum with maximum concentration of the catalytically active materials being in the second layer.
    Type: Grant
    Filed: June 8, 1978
    Date of Patent: May 1, 1979
    Assignee: General Motors Corporation
    Inventors: Jack C. Summers, Louis Hegedus