| Patent application number | Description | Published |
|---|
| 20090191108 | Zirconium/Praseodymium Oxide NOx Traps and Prufication of Gases Containing Nitrogen Oxides (NOx) Therewith - A method for treating/purification a gas containing nitrogen oxides (NOx) includes conveying same through a NOx trap containing a composition based on a catalyst for oxidizing NOx into NO | 07-30-2009 |
| 20090220398 | CATALYST COMPOSITIONS FOR THE TREATMENT OF VEHICULAR EXHAUST GASES COMPRISE ZIRCONIUM OXIDE AND CERIUM OXIDE, AND HAVE A HIGH REDUCIBILITY AND A STABLE SPECIFIC SURFACE AREA - Catalyst compositions for the treatment of vehicular exhaust gases are based on zirconium and cerium oxides, have a cerium oxide content of at most 50% by weight, a level of reducibility of at least 95% after calcination in air at 600°, and a specific surface area after calcination for 4 hours at 1100° of at least 15 m | 09-03-2009 |
| 20090269263 | Gas Processing for Catalytically Oxidizing Carbon Monoxide and Hydrocarbons In the Presence of a Metal/Silica-Containing Zirconia Catalyst - The processing of gases, in particular the exhaust gas of an internal combustion/diesel engine, entails catalytically oxidizing the carbon monoxide and hydrocarbons contained therein in an oxygen-rich medium, in the presence of a metal oxidation catalyst that includes a silica-containing zirconia support. | 10-29-2009 |
| 20090274599 | CATALYTIC COMPOSITIONS COMPRISING THE OXIDES OF ZIRCONIUM, CERIUM, YTTRIUM, LANTHANUM AND OTHER RARE EARTHS - Catalytic compositions useful, e.g., for the treatment of internal combustion engine exhaust gases, are based on zirconium oxide in a weight proportion of at least 25%, from 15% to 60% of cerium oxide, from 10% to 25% of yttrium oxide, from 2% to 10% of lanthanum oxide and from 2% to 15% of another rare earth oxide, have a specific surface of at least 15 m | 11-05-2009 |
| 20090297416 | ALUMINA-BASED NITROGEN OXIDE (NOx) TRAPPING COMPOSITIONS AND TREATMENT OF VEHICULAR EXHAUST GASES THEREWITH - Thermally stable, solid alumina-based compositions useful for the trapping of nitrogen oxides that are contained in gaseous fluids, notably in vehicular exhaust gases, are formed of alumina, cerium and a divalent metal M selected from among barium, strontium or an association of these two elements and which include at least 10% of the weight of element M expressed by weight of oxide in contrast to the total weight of the composition and also wherein the aluminate compound of the metal element M, i.e., MAl | 12-03-2009 |
| 20100040523 | HIGH SPECIFIC SURFACE/REDUCIBILITY CATALYST/CATALYST SUPPORT COMPOSITIONS COMPRISING OXIDES OF ZIRCONIUM, CERIUM AND LANTHANUM AND OF YTTRIUM, GADOLINIUM OR SAMARIUM - Catalyst/catalyst support composition essentially consist of oxides of zirconium, cerium and lanthanum and of another rare earth selected from among yttrium, gadolinium and samarium, having a proportion of the lanthanum oxide and the oxide of the other rare earth of at least 15% and specific surfaces of at least 40 m | 02-18-2010 |
| 20100247407 | HIGHLY ACIDIC COMPOSITIONS COMPRISING ZIRCONIUM AND SILICON OXIDES AND AN OXIDE OF AT LEAST ONE OTHER ELEMENT SELECTED FROM AMONG TITANIUM, ALUMINUM, TUNGSTEN, MOLYBDENUM, CERIUM, IRON, TIN, ZINC, AND MANGANESE - Compositions useful for treating the exhaust gases of diesel engines contain zirconium oxide, silicon oxide and at least one oxide of at least one element M selected from among titanium, aluminum, tungsten, molybdenum, cerium, iron, tin, zinc, and manganese, in the following mass proportions of these different elements: silicon oxide: 5%-30%; M-element oxide: 1%-20%; the balance being zirconium oxide; such compositions also have an acidity, as measured by the methylbutynol test, of at least 90% and are prepared by placing a zirconium compound, a silicon compound, at least one M-element compound and a basic compound in a liquid medium, thereby generating a precipitate, maturing the precipitate in a liquid medium and separating and calcining the precipitate. | 09-30-2010 |
| 20100247411 | HIGHLY ACIDIC COMPOSITIONS COMPRISING ZIRCONIUM OXIDE, TITANIUM OXIDE AND TUNGSTEN OXIDE AND TREATMENT OF EXHAUST GASES THEREWITH - Compositions useful for treating exhaust gases contain zirconium, titanium and tungsten oxides, and optionally the oxide of an element M selected from among silicon, aluminum, iron, molybdenum, manganese, zinc, tin, and rare earths in the following mass proportions of these different elements: titanium oxide: 20%-50%; tungsten oxide: 1%-20%, M-element oxide: 1%-20%; the balance being zirconium oxide; such compositions are prepared by placing in a liquid medium a zirconium compound, a titanium compound, optionally an M-element compound and a basic compound, adding a tungsten compound to the precipitate suspension thus obtained and having a pH value ranging from 1 to 7, maturing the suspension resulting from the preceding step, and optionally separating the precipitate and calcining same. | 09-30-2010 |
| 20110033352 | CATALYST/CATALYST SUPPORT COMPOSITIONS COMPRISING THE OXIDES OF ZIRCONIUM, YTTRIUM AND TUNGSTEN - Compositions based on zirconium oxide, including 1 to 20% yttrium oxide, 1 to 30% tungsten oxide and the balance zirconium oxide, have a specific surface area of at least 40 m | 02-10-2011 |
| 20110097252 | COMPOSITIONS BASED ON CERIUM OXIDE, ZIRCONIUM OXIDE AND, OPTIONALLY, ANOTHER RARE EARTH OXIDE, HAVING A SPECIFIC RAISED SURFACE AT 1100.degree.C, METHOD FOR THE PRODUCTION AND USE THEREOF AS A CATALYST - The inventive composition, according to a first embodiment, consists essentially of a cerium oxide and a zirconium oxide in an atomic ratio Ce/Zr of at least 1. According to a second embodiment, said composition is based on cerium oxide, zirconium oxide with an atomic ratio Ce/Zr of at least 1 and at least one rare earth oxide other than cerium. After calcination at 1100° C., said composition has a specific surface of at least 9 m | 04-28-2011 |
| 20110166014 | Composition Based on Cerium Oxide and On Zirconium Oxide Having A High Reducibility and High Specific Surface, Methods for the Preparation Thereof and Use As A Catalyst - The inventive composition is based on cerium oxide and on zirconium oxide in an atomic proportion Ce/Zr of at least 1, and has a reducibility rate of at least 70% and a surface area of at least 15 m; 2; /g. This composition is obtained by a method in which: a mixture is made containing cerium and zirconium compounds; this mixture is provided with a basic compound whereby obtaining a precipitate that is heated in an aqueous medium; a surfactant-type additive or a polyethylene glycol or a carboxylic acid is added to this medium or to the separated precipitate; the mixture is ground; the precipitate obtained thereof is calcined under inert gas or vacuum, in a first period of time, at a temperature of at least 850 .iC and then under an oxidizing atmosphere, in a second period of time, at a temperature of at least 400 .° C. | 07-07-2011 |
