Patents Assigned to Rhodia Electronics & Catalysis
  • Patent number: 8460626
    Abstract: 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 m2/g in the second embodiment. The inventive composition can be used as a catalyst especially for the treatment of waste gases from internal combustion engines.
    Type: Grant
    Filed: December 23, 2010
    Date of Patent: June 11, 2013
    Assignee: Rhodia Electronics and Catalysis
    Inventors: Olivier Larcher, Emmanuel Rohart
  • Publication number: 20110097252
    Abstract: 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 m2/g in the second embodiment. The inventive composition can be used as a catalyst especially for the treatment of waste gases from internal combustion engines.
    Type: Application
    Filed: December 23, 2010
    Publication date: April 28, 2011
    Applicant: RHODIA ELECTRONICS AND CATALYSIS
    Inventors: Olivier LARCHER, Emmanuel Rohart
  • Patent number: 7674834
    Abstract: The invention concerns a colloidal dispersion of a vanadate or a phosphovanadate of at least a rare earth comprising either a complex-forming agent having a pK higher than 2.5, or an anion of a monovalent acid, soluble in water and having a pKa ranging between 2.5 and 5. The dispersion is obtained by contacting a colloidal dispersion or a dispersion of initial complexes comprising at least a rare earth compound and at least a complex-forming agent or an anion of said monovalent acid and whereof the pH has been adjusted to a value of at least 7, with vanadate ions, then, in adjusting the pH of the resulting medium to a value of at least 9 and heating.
    Type: Grant
    Filed: May 11, 2007
    Date of Patent: March 9, 2010
    Assignee: Rhodia Electronics & Catalysis
    Inventors: Jean-Yves Chane-Ching, Thierry Le Mercier
  • Patent number: 7625546
    Abstract: The invention relates to alkaline-earth or rare-earth metal aluminate precursor compounds, to their method of preparation and to their use in particular as phosphor precursors. These alkaline-earth or rare-earth metal aluminate precursor compounds are essentially crystallized in the form of a transition alumina and in the form of substantially spherical and chemically homogeneous particles including pores whose mean diameter is of at least 10 nm.
    Type: Grant
    Filed: May 19, 2004
    Date of Patent: December 1, 2009
    Assignee: Rhodia Electronics & Catalysis
    Inventors: Benjamin Delespierre, Cédric Froidefond, Thierry Le Mercier
  • Patent number: 7572835
    Abstract: The invention concerns a colloidal dispersion of a phosphate of a rare earth and a process for its preparation. The dispersion is characterized in that it comprises anisotropic and disaggregated or disaggregatable particles of a phosphate of at least one rare earth and an anion of a monobasic acid, soluble in water and with a pKa of at least 2.5. It is prepared by a process in which a solution of a salt of at least one rare earth is mixed with phosphate ions while controlling the pH of the reaction medium to a value in the range 4 to 9 and in the presence of a monobasic acid, soluble in water and with a pKa of at least 2.5; the mixture obtained optionally undergoes a maturing step; the precipitate is then separated from the reaction medium; and said precipitate is then dispersed in water.
    Type: Grant
    Filed: December 14, 2006
    Date of Patent: August 11, 2009
    Assignee: Rhodia Electronics & Catalysis
    Inventor: Jean-Yves Chane-Ching
  • Patent number: 7569613
    Abstract: The invention concerns an aqueous colloidal dispersion of isotropic particles of a phosphate of at least one rare earth and is characterized in that it comprises either a complexing agent with a pK (cologarithm of the dissociation constant of the complex formed by the complexing agent and said rare earth) of more than 2.5; or an anion of a monobasic acid, soluble in water and with a pKa in the range 2.5 to 5; or said complexing agent and/or said anion of a monobasic acid. In the case of cerium and lanthanum, the mean particle size is at most 20 nm. The dispersions can have a degree of colloid agglomeration of less than 40%.This dispersion can be prepared by forming an aqueous mixture comprising at least one rare earth salt and the complexing agent or monobasic acid anion; by adding a base then phosphate ions to the mixture formed; and heating the mixture obtained. A precipitate is obtained that is re-dispersed in water.
    Type: Grant
    Filed: March 27, 2007
    Date of Patent: August 4, 2009
    Assignee: Rhodia Electronics & Catalysis
    Inventor: Jean-Yves Chane-Ching
  • Patent number: 7536834
    Abstract: The invention concerns a light transforming material, in particular for greenhouse walls, comprising as additive a barium and magnesium silicate of formula Ba3(1-x)Eu3xMg1-yMnySi2O8, wherein 0<x?0.3 and 0<y?0.3and 0<y=0.3. The material is capable of transforming solar energy of UV range into a red light. The material can also be used in paints and cosmetics.
    Type: Grant
    Filed: November 4, 2003
    Date of Patent: May 26, 2009
    Assignee: Rhodia Electronics & Catalysis
    Inventors: Wilfried Blanc, Claude Ceintrey, Claude Fouassier, Thierry Le Mercier
  • Patent number: 7524474
    Abstract: The invention concerns a process for preparing an oxide based on zirconium and titanium in which a liquid medium containing a zirconium compound and a titanium compound is formed; said medium is then heated; the precipitate obtained from the end of the preceding step is recovered and optionally, said precipitate is calcined. The invention also concerns an oxide based on zirconium and titanium. Said oxide can comprise in the range 30% to 40% by weight of titanium oxide and in this case it has a pure ZrTiO4 type structure or a mixture of phases of structure type ZrTiO4 and structure type anatase. Said oxide can also comprise in the range 10% to 20% by weight of titanium oxide and it then has a specific surface area of at least 40 m2/g after calcining for 5 hours at 800° C.
    Type: Grant
    Filed: February 16, 2007
    Date of Patent: April 28, 2009
    Assignee: Rhodia Electronics & Catalysis
    Inventor: Catherine Hedouin
  • Patent number: 7462665
    Abstract: The invention relates to an aqueous paint composition, particularly a lacquer or a varnish and an aqueous colloidal dispersion of cerium. Said dispersion has a pH of at least 7 and comprises an organic acid with at least three acid functions of which the third pK is at most 10 or a salt of said acid with ammonia or an amine. Said composition has an improved water content and mechanical properties which improve throughout the life thereof or the duration of the presence thereof on the substrate for protection.
    Type: Grant
    Filed: May 27, 2003
    Date of Patent: December 9, 2008
    Assignee: Rhodia Electronics & Catalysis
    Inventors: Jean-Noël Bousseau, David Fauchadour, Bruno Tolla
  • Patent number: 7459484
    Abstract: The colloidal dispersion of the invention is characterized in that it comprises an organic phase; particles of an iron compound in its amorphous form; and at least one amphiphilic agent. It is prepared by a process in which either an iron salt in the presence of an iron complexing agent or an iron complex is reacted with a base, maintaining the pH of the reaction medium at a value of at most 8 to obtain a precipitate, the iron complexing agent being selected from hydrosoluble carboxylic acids with a complexing constant K such that the pK is at least 3 and the iron complex being selected from the products of reacting iron salts with said acids; then the precipitate obtained or a suspension containing said precipitate is brought into contact with an organic phase in the presence of an amphiphilic agent to obtain the dispersion in an organic phase. The dispersion of the invention can be used as a combustion additive in liquid fuel or motor fuel.
    Type: Grant
    Filed: December 19, 2002
    Date of Patent: December 2, 2008
    Assignee: Rhodia Electronics and Catalysis
    Inventors: Gilbert Blanchard, Jean-Yves Chane-Ching, Bruno Tolla
  • Patent number: 7247283
    Abstract: The invention concerns a process for preparing an oxide based on zirconium and titanium in which a liquid medium containing a zirconium compound and a titanium compound is formed; said medium is then heated; the precipitate obtained from the end of the preceding step is recovered and optionally, said precipitate is calcined. The invention also concerns an oxide based on zirconium and titanium. Said oxide can comprise in the range 30% to 40% by weight of titanium oxide and in this case it has a pure ZrTiO4 type structure or a mixture of phases of structure type ZrTiO4 and structure type anatase. Said oxide can also comprise in the range 10% to 20% by weight of titanium oxide and it then has a specific surface area of at least 40 m2/g after calcining for 5 hours at 800° C.
    Type: Grant
    Filed: December 11, 2002
    Date of Patent: July 24, 2007
    Assignee: Rhodia Electronics and Catalysis
    Inventor: Catherine Hedouin
  • Patent number: 7208130
    Abstract: The invention concerns a process for preparing rare earth borates, and the use of these borates in luminescence. The preparation process is characterized in that it comprises the following steps mixing boric acid and a rare earth salt; a reacting the mixture obtained with a carbonate or a bicarbonate; a calcining the precipitate obtained.
    Type: Grant
    Filed: December 14, 2000
    Date of Patent: April 24, 2007
    Assignee: Rhodia Electronics and Catalysis
    Inventors: Jean-Jacques Braconnier, Muriel Goubard
  • Patent number: 7169820
    Abstract: The invention concerns a colloidal dispersion of a phosphate of a rare earth and a process for its preparation. The dispersion is characterized in that it comprises anisotropic and disaggregated or disaggregatable particles of a phosphate of at least one rare earth and an anion of a monobasic acid, soluble in water and with a pKa of at least 2.5. It is prepared by a process in which a solution of a salt of at least one rare earth is mixed with phosphate ions while controlling the pH of the reaction medium to a value in the range 4 to 9 and in the presence of a monobasic acid, soluble in water and with a pKa of at least 2.5; the mixture obtained optionally undergoes a maturing step; the precipitate is then separated from the reaction medium; and said precipitate is then dispersed in water.
    Type: Grant
    Filed: December 7, 2001
    Date of Patent: January 30, 2007
    Assignee: Rhodia Electronics and Catalysis
    Inventor: Jean-Yves Chane-Ching
  • Publication number: 20060263284
    Abstract: The inventive composition, according to a first embodiment, consists essentially of a cerium oxide and a zirconium oxide. According to a second embodiment, said composition is based on cerium oxide, zirconium oxide and at least one rare earth oxide other than cerium. After a first 4-hour period of calcination at 900 .C followed by a second 10-hour period of at 1000 .C, the specific surface variation thereof is 20% maximum in the first embodiment and 15% maximum in the second embodiment. The inventive composition can be used as a catalyst, i.e. in the treatment of waste gases from internal combustion engines.
    Type: Application
    Filed: March 17, 2004
    Publication date: November 23, 2006
    Applicant: RHODIA ELECTRONICS AND CATALYSIS
    Inventors: Olivier Larcher, Emmanuel Rohart, David Monin
  • Patent number: 6773629
    Abstract: The invention relates to a compound based on at least one element A chosen from alkaline-earth metals, on at least one element B chosen from aluminium, gallium and indium, on sulphur and on a dopant capable of giving the compound luminescence properties, which is characterized in that it is in the form of a mixture of predominantly an AB2S4-type crystallographic phase and a B2S3-type crystallographic phase. This compound is prepared by a method in which a solution or suspension comprising salts or sols of the elements A, B and of the dopant is formed in a proportion such that the B/(A+dopant) atomic ratio is at least 2.06; the solution or suspension is spray-dried; the product thus obtained is sulphurized. This compound may be used as a phosphor, especially in cathodoluminescence.
    Type: Grant
    Filed: September 10, 2001
    Date of Patent: August 10, 2004
    Assignee: Rhodia Electronics and Catalysis
    Inventors: Thierry Le Mercier, Olivier Le Roux