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| Number | Title | Issue Date |
| 8039265 | Determining oxygen content of metal species in heterogeneous catalysts The oxygen content of metal species in a heterogeneous catalyst is determined using volumetric adsorption measurements. Such measurements are employed to quantify the amount of reduction gas that it takes to reduce metal species of a catalyst sample, and the oxygen ... | 10/18/2011 |
| 7817819 | Characterization of metal particle distributions in a supported catalyst A catalyst sample may contain both small and large metal particle distributions simultaneously. Characterizing the properties of the metal particles contained in each distribution is important to help describe catalytic performance and optimize catalysts. Monte Carl... | 10/19/2010 |
| 7813523 | Dispersion and metal particle size characterization of nanocatalysts A relationship between dispersion and surface-averaged metal particle size is provided so that either dispersion can be determined from measured surface-averaged metal particle size or surface-averaged metal particle size can be determined from measured dispersion. ... | 10/12/2010 |
| 7745367 | Engine exhaust catalysts containing palladium-gold An emission control catalyst that exhibits improved CO and HC reduction performance includes a supported platinum-based catalyst, and a supported palladium-gold catalyst. The two catalysts are coated onto different layers, zones, or monoliths of the substrate for th... | 06/29/2010 |
| 7709414 | Engine exhaust catalysts containing palladium-gold An engine exhaust catalyst exhibits improved CO oxidation performance relative to conventional engine exhaust catalysts and includes a first supported catalyst comprising platinum and a second supported catalyst comprising palladium and gold species in close contact... | 05/04/2010 |
| 7709407 | Palladium-gold catalyst synthesis A supported palladium-gold catalyst is produced under mild conditions using a commonly available base, such as sodium hydroxide (NaOH) or sodium carbonate (Na2CO3). In this method, support materials and a base solution are mixed together and th... | 05/04/2010 |
| 7611680 | Platinum-bismuth catalysts for treating engine exhaust An engine exhaust catalyst containing precious metal nanoparticles is promoted with bismuth. The bismuth promotion improves the catalyst's CO oxidation performance. Also, by varying the amount of bismuth that is added, the NO conversion rate that can be realized wit... | 11/03/2009 |
| 7605109 | Platinum-bismuth catalysts for treating engine exhaust An engine exhaust catalyst containing precious metal nanoparticles is promoted with bismuth. The bismuth promotion improves the catalyst's CO oxidation performance. Also, by varying the amount of bismuth that is added, the NO conversion rate that can be realized wit... | 10/20/2009 |
| 7561756 | Particle shape characterization from 2D images Three-dimensional (3D) shapes of particles are characterized from a two-dimensional (2D) image of the particles that is obtained using TEM. The 3D shape characterization method includes the steps of obtaining a 2D image of a batch of nanoparticles, determining 2D sh... | 07/14/2009 |
| 7534738 | Engine exhaust catalysts containing palladium-gold An emission control catalyst that exhibits improved CO and HC reduction performance includes a supported platinum-based catalyst, and a supported palladium-gold catalyst. The two catalysts are coated onto different layers, zones, or monoliths of the substrate for th... | 05/19/2009 |
| 7527771 | Dissolving metal particles from supported catalyst using ultrasonic energy, solvent and etchant A sample preparation method for characterization of nanoparticles embedded in the supports of heterogeneous catalysts, with improved particle dispersion, is introduced. The supported catalyst is first ground or milled into fine powder. Then, the powder is mixed into... | 05/05/2009 |
| 7521392 | Supported catalysts having platinum particles The catalytic efficiency of supported catalysts containing metal nanoparticles is strongly related to the chemical softness at the surfaces of such nanoparticles. Supported catalysts containing platinum nanoparticles having average surface softness values (expressed... | 04/21/2009 |
| 7517826 | Engine exhaust catalysts containing zeolite and zeolite mixtures A multi-layer emission control catalyst exhibits improved CO and HC reduction performance. The bottom layer includes a supported catalyst comprising platinum and palladium particles or palladium and gold particles. The middle layer includes zeolites. The top layer i... | 04/14/2009 |
| 7482163 | Method of estimating chemical reactivity of nanoparticles The catalytic efficiency of supported catalysts containing metal nanoparticles is strongly related to the chemical softness at the surfaces of such nanoparticles. The chemical softness of a nanoparticle is obtained using results from Density Functional Theory modeli... | 01/27/2009 |
| 7430322 | Particle shape characterization from 2D images The size distributions corresponding to the three-dimensional (3D) shapes of particles are estimated from a 3D-to-2D projection matrix and a two-dimensional (2D) image of the particles that is obtained using TEM. Two different methods to generate a 3D-to-2D projecti... | 09/30/2008 |
| 7381683 | Method of producing multi-component catalysts Supported catalysts are produced with nanometer sized particles comprised of different metals dispersed throughout the catalyst support material. The supported catalysts reduce substantially or completely the amount of platinum that is required without sacrificing c... | 06/03/2008 |
| 7381682 | Method for producing heterogeneous catalysts containing metal nanoparticles A method for producing highly dispersed catalysts is disclosed. The method includes contacting a support material with a solvent for a period of time, adding a metal salt to the solvent and support mixture, and then adding a reducing agent to the solution to reduce ... | 06/03/2008 |
