Patents Assigned to Magnesium Elektron Limited
  • Patent number: 10570063
    Abstract: This invention relates to an aqueous dispersion of nanoparticles, the nanoparticles comprising, on an oxide basis: (a) 85-100 wt % ZrO2+HfO2, (b) 0-15 wt % Y2O3, and (c) 0-2 wt % Al2O3, wherein the dispersion has a polydispersity index of 0.10-0.17. The invention also relates to a method of forming a ceramic article comprising the steps of: (a) pouring the aqueous dispersion into a mould, (b) drying the aqueous dispersion in the mould to form a green body, and (c) sintering the green body to form the ceramic article.
    Type: Grant
    Filed: February 5, 2019
    Date of Patent: February 25, 2020
    Assignee: Magnesium Elektron Limited
    Inventor: William Wiseman
  • Patent number: 10337086
    Abstract: A magnesium alloy suitable for use as a corrodible downhole article. The alloy has a corrosion rate of at least 50 mg/cm2/day in 15% KCl at 93° C. and a 0.2% proof strength of at least 50 MPa when tested using standard tensile test method ASTM B557-10.
    Type: Grant
    Filed: July 28, 2015
    Date of Patent: July 2, 2019
    Assignee: Magnesium Elektron Limited
    Inventors: Timothy E Wilks, Mark Turski
  • Patent number: 10329643
    Abstract: A corrodible downhole article includes a magnesium alloy. The magnesium alloy includes: 1-9 wt % Zn; 1-2 wt % Cu; 0.5-1.0 wt % Mn; and 0.1-5 wt % of a corrosion promoting element (e.g., Ni). The alloy can have a 0.2% proof strength of at least 150 MPa when tested using standard tensile test method ASTM B557-10.
    Type: Grant
    Filed: September 8, 2017
    Date of Patent: June 25, 2019
    Assignee: Magnesium Elektron Limited
    Inventors: Timothy E. Wilks, Mark Turski
  • Patent number: 10266923
    Abstract: A magnesium alloy is suitable for use as a corrodible downhole article, wherein the alloy includes: (a) 2-7 wt % Gd, (b) 0-2 wt % Y, (c) 0-5.0 wt % Nd, and (d) at least 80 wt % Mg, and has an elongation as measured by ASTM B557M-10 of at least 22%.
    Type: Grant
    Filed: January 9, 2018
    Date of Patent: April 23, 2019
    Assignee: Magnesium Elektron Limited
    Inventors: Timothy E. Wilks, Mark Turski, Matthew Murphy
  • Patent number: 10081853
    Abstract: A magnesium alloy is suitable for use as a corrodible downhole article, wherein the alloy includes: (a) 11-15 wt % Y, (b) 0.5-5 wt % in total of rare earth metals other than Y, (c) 0-1 wt % Zr, (d) 0.1-5 wt % Ni, and (e) at least 70 wt % Mg. It has been surprisingly found by the inventors that by increasing the Y content of the alloy to the range specified above, increased age hardening response and hence increased 0.2% proof stress can be achieved.
    Type: Grant
    Filed: January 9, 2018
    Date of Patent: September 25, 2018
    Assignee: Magnesium Elektron Limited
    Inventors: Timothy E. Wilks, Mark Turski, Matthew Murphy
  • Patent number: 9920402
    Abstract: Magnesium alloys which possess good processability and/or ductility while retaining good resistance to corrosion and/or degradation comprising Y: 0-10% by weight, Nd: 0-5% by weight, wherein the total of Y+Nd is at least 0.05% by weight, one or more heavy rare earths selected from Ho, Lu, Tm and Tb in a total amount of above 0.5% and no more than 5.5% by weight, Gd: 0-3.0% by weight, and Sm: 0-0.2% by weight. The alloy optionally includes one or more of: Dy: 0-8% by weight; Zr: 0-1.2% by weight; Al: 0-7.5% by weight; Zn and/or Mn: 0-2% by weight in total; Sc: 0-15% by weight; In: 0-15% by weight; Ca: 0-3% by weight; Er up to 5.5% by weight, provided that the total of Er, Ho, Lu, Tm and Tb is no more than 5.5% by weight; and one or more rare earths and heavy rare earths other than Y, Nd, Ho, Lu, Tm, Tb, Dy, Gd and Er in a total amount of up to 0.5% by weight; the balance being magnesium and incidental impurities up to a total of 0.3% by weight.
    Type: Grant
    Filed: March 23, 2011
    Date of Patent: March 20, 2018
    Assignee: Magnesium Elektron Limited
    Inventor: Paul Lyon
  • Patent number: 9169129
    Abstract: A composition based on cerium, zirconium and tungsten is described. The composition has a content expressed as an oxide, of which cerium is from 5% to 30% of the composition, tungsten is from 2% to 17% of the composition, and the remainder of the composition is zirconium. After aging at 750° C. under an air atmosphere including 10% water, it has a two-phase crystallographic structure having a tetragonal zirconia phase and a monoclinic zirconia phase, with no presence of a crystalline phase including tungsten. The composition can be used as a catalyst, especially in an SCR process.
    Type: Grant
    Filed: May 17, 2011
    Date of Patent: October 27, 2015
    Assignees: RHODIA OPERATIONS, MAGNESIUM ELEKTRON LIMITED
    Inventors: Julien Hernandez, Emmanuel Rohart, Rui Jorge Coelho Marques, Deborah Jane Harris, Clare Jones
  • Patent number: 9017604
    Abstract: Magnesium alloys containing: Y: 2.0-6.0% by weight Nd: 0-4.0% by weight Gd: 0-5.5% by weight Dy: 0-5.5% by weight Er: 0-5.5% by weight Zr: 0.05-1.0% by weight Zn+Mn: <0.11% by weight, optionally other rare earths and heavy rare earths, the balance being magnesium and incidental impurities and the total content of Gd, Dy and Er is in the range of 0.3-12% by weight, wherein either the alloy contains low amounts of Yb and Sm and exhibits a corrosion rate as measured according to ASTM B 117 of less than 30 Mpy, and/or the area percentage of any precipitated particles arising when the alloy is processed having an average particle size greater than 1 [mu]m and less than 15 [mu]m is less than 3%.
    Type: Grant
    Filed: September 30, 2009
    Date of Patent: April 28, 2015
    Assignee: Magnesium Elektron Limited
    Inventors: Paul Lyon, Ismet Syed, Anthony James Boden, Kenneth Savage
  • Patent number: 9011806
    Abstract: The invention relates to a method for treating a gas containing nitrogen oxides (NOx), in which an NOx-reduction reaction is carried out using a nitrogen-containing reducing agent, which invention is characterized in that the catalyst used for the reduction reaction is a catalytic system containing a composition comprising zirconium, cerium and niobium in the following percentages by weight, expressed in terms of the weight of oxide: 10-50% of cerium, 5-20% of niobium and the remainder consisting of zirconium.
    Type: Grant
    Filed: February 28, 2012
    Date of Patent: April 21, 2015
    Assignees: Rhodia Operations, Magnesium Elektron Limited
    Inventors: Laure Bisson, Julien Hernandez, Rui Miguel Jorge Coelho Marques, Emmanuel Rohart, Mila Bortun, Deborah Jayne Harris, Clare Jones
  • Publication number: 20140044629
    Abstract: The invention relates to a method for treating a gas containing nitrogen oxides (NOx), in which an NOx-reduction reaction is carried out using a nitrogen-containing reducing agent, which invention is characterized in that the catalyst used for the reduction reaction is a catalytic system containing a composition comprising zirconium, niobium in the following percentages by weight, expressed in terms of the weight of oxide: 10-50% of cerium, 5-20% of niobium and the remainder consisting of zirconium.
    Type: Application
    Filed: February 28, 2012
    Publication date: February 13, 2014
    Applicants: MAGNESIUM ELEKTRON LIMITED, RHODIA OPERATIONS
    Inventors: Laure Bisson, Julien Hernandez, Rui Miguel Jorge Coelho Marques, Emmanuel Rohart, Mila Bortun, Deborah Jayne Harris, Clare Jones
  • Publication number: 20130212944
    Abstract: A zirconium-based mixed oxide or zirconium-based mixed hydroxide which is capable of (a) at least 90% v/v conversion of naphthalene at atmospheric pressure at a temperature in the range 600-700° C. using a residence time of about 0.3 seconds, and/or (b) providing an initial heat of adsorption of ammonia of greater than 150 kJ/mol when measured by ammonia flowing gas microcalorimetry. Also, a method for purifying gas produced from the gasification of carbonaceous materials, comprising the step of bringing the gas into contact with such mixed oxides or mixed hydroxides.
    Type: Application
    Filed: August 22, 2011
    Publication date: August 22, 2013
    Applicants: VALTION TEKNILLINEN TUTKIMUSKESKUS, MAGNESIUM ELEKTRON LIMITED
    Inventors: Hazel Stephenson, Heather Bradshaw, Pekka Simell, Anu Solla, Ella Ronkkonen, Outi Krause
  • Publication number: 20130195714
    Abstract: Magnesium alloys which possess good processability and/or ductility whilst retaining good resistance to corrosion and/or degradation comprising Y: 0-10% by weight, Nd: 0-5% by weight, wherein the total of Y+Nd is at least 0.05% by weight, one or more heavy rare earths selected from Ho, Lu, Tm and Tb in a total amount of above 0.5% and no more than 5.5% by weight, Gd: 0-3.0% by weight, and Sm: 0-0.2% by weight. The alloy optionally includes one or more of: Dy: 0-8% by weight; Zr: 0-1.2% by weight; Al: 0-7.5% by weight; Zn and/or Mn: 0-2% by weight in total; Sc: 0-15% by weight; In: 0-15% by weight; Ca: 0-3% by weight; Er up to 5.5% by weight, provided that the total of Er, Ho, Lu, Tm and Tb is no more than 5.5% by weight; and one or more rare earths and heavy rare earths other than Y, Nd, Ho, Lu, Tm, Tb, Dy, Gd and Er in a total amount of up to 0.5% by weight; the balance being magnesium and incidental impurities up to a total of 0.3% by weight.
    Type: Application
    Filed: March 23, 2011
    Publication date: August 1, 2013
    Applicant: Magnesium Elektron Limited
    Inventor: Paul Lyon
  • Publication number: 20130195743
    Abstract: A method is described for treating a gas including nitrogen oxides (NOx). The method can include conducting a reduction reaction of the nitrogen oxides with a nitrogen reducing agent. Further described, is a catalyst used for the reduction reaction which is a catalytic system including a composition based on cerium oxide and including niobium oxide in a proportion by a mass of from 2% to 20%.
    Type: Application
    Filed: September 28, 2011
    Publication date: August 1, 2013
    Applicants: MAGNESIUM ELEKTRON LIMITED, RHODIA OPERATIONS
    Inventors: Julien Hernandez, Emmanuel Rohart, Rui Jorge Coelho Marques, Deborah Jayne Harris, Clare Jones
  • Publication number: 20130174739
    Abstract: This invention relates to the utilization of regenerable water tolerant solid materials for the abatements of CO2 emissions from internal combustion engine exhaust streams through repetitive sorption/desorption cycles. The system, which is designed to be used in a gasoline, lean gasoline, diesel passenger car, diesel truck, stationary engine with 50 Hz or 60 Hz electrical frequency, or a SOFC, will contain a solid sorbent which contains zirconium and will be able to reduce on board the average carbon emissions by up to 10 wt %. The preferred materials have been selected from the class of hydrotalcite type compounds and/or earth and alkaline earth zirconates.
    Type: Application
    Filed: September 19, 2011
    Publication date: July 11, 2013
    Applicant: MAGNESIUM ELEKTRON LIMITED
    Inventors: Emiliana Mariana Dvininov, Hazel Stephenson
  • Publication number: 20130164201
    Abstract: A composition based on cerium, zirconium and tungsten is described. The composition has a content expressed as an oxide, of which cerium is from 5% to 30% of the composition, tungsten is from 2% to 17% of the composition, and the remainder of the composition is zirconium. After aging at 750° C. under an air atmosphere including 10% water, it has a two-phase crystallographic structure having a tetragonal zirconia phase and a monoclinic zirconia phase, with no presence of a crystalline phase including tungsten. The composition can be used as a catalyst, especially in an SCR process.
    Type: Application
    Filed: May 17, 2011
    Publication date: June 27, 2013
    Applicants: MAGNESIUM ELEKTRON LIMITED, RHODIA OPERATIONS
    Inventors: Julien Hernandez, Emmanuel Rohart, Rui Jorge Coelho Marques, Deborah Jane Harris, Clare Jones
  • Patent number: 8414835
    Abstract: The present invention relates to oxygen storage components for catalytic converters for automobile exhaust systems, particularly for those with petrol-driven engines. In accordance with the present invention there is provided a ceria containing mixed oxide suitable as an oxygen storage material having a ceria content in the range 10 to 80% by weight and at least one metal oxide in an amount of less than 0.5% by weight, wherein the metal is selected from the first row transition elements and the group IVB elements of the periodic table. The inventions also provides an oxygen storage material for catalytic converters for automobile exhaust systems comprising an oxide of the present invention.
    Type: Grant
    Filed: May 17, 2007
    Date of Patent: April 9, 2013
    Assignee: Magnesium Elektron Limited
    Inventors: Heather Bradshaw, Colin Norman
  • Publication number: 20120328500
    Abstract: 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.
    Type: Application
    Filed: September 5, 2012
    Publication date: December 27, 2012
    Applicants: MAGNESIUM ELEKTRON LIMITED, RHODIA OPERATIONS
    Inventors: Olivier LARCHER, Emmanuel ROHART, Stephan VERDIER, Heather BRADSHAW, Clive BUTLER, Deborah HARRIS, Mairead FEELEY, Guillaume CRINIERE
  • Publication number: 20110229365
    Abstract: Magnesium alloys containing: Y: 2.0-6.0% by weight Nd: 0-4.0% by weight Gd: 0-5.5% by weight Dy: 0-5.5% by weight Er: 0-5.5% by weight Zr: 0.05-1.0% by weight Zn+Mn: <0.11% by weight, optionally other rare earths and heavy rare earths, the balance being magnesium and incidental impurities and the total content of Gd, Dy and Er is in the range of 0.3-12% by weight, wherein either the alloy contains low amounts of Yb and Sm and exhibits a corrosion rate as measured according to ASTM B117 of less than 30 Mpy, and/or the area percentage of any precipitated particles arising when the alloy is processed having an average particle size greater than 1 m and less than 15 m is less than 3%.
    Type: Application
    Filed: September 30, 2009
    Publication date: September 22, 2011
    Applicant: Magnesium Elektron Limited
    Inventors: Paul Lyon, Ismet Syed, Anthony James Boden, Kenneth Savage
  • Publication number: 20110183840
    Abstract: An improved method for the formation of composite hydroxides or oxides comprising, on an oxide basis, Al2O3 and ZrO2, and optionally CeO2, La2O3, Nd2O3, Pr6O11, Sm2O3, Y2O3, and other rare earth oxides, comprising the steps of preparing an aqueous metal salt solution and forming a hydroxide precipitate slurry by combining the aqueous metal salt solution with an aqueous solution of a caustic alkali at a pH greater than 8.5 to precipitate out all the metal species. The variation in pH during the precipitation reaction is ±1. The invention also relates to composites formed by this method comprising 20-70 wt % Al2O3, 10-77 wt % ZrO2, 0-34 wt % CeO2 and 0-22 wt % REOs other than CeO2, and to composites per se comprising, on an oxide basis, 42-70 wt % Al2O3, 10-48 wt % ZrO2, 2-34 wt % CeO2 and 0-9 wt % REOs other than CeO2 and having the following properties after heating to 850° C. over four hours and holding at 850° C.
    Type: Application
    Filed: April 6, 2011
    Publication date: July 28, 2011
    Applicant: MAGNESIUM ELEKTRON LIMITED
    Inventor: John G. DARAB
  • Patent number: 7939041
    Abstract: An improved method for the formation of composite hydroxides or oxides comprising, on an oxide basis, Al2O3 and ZrO2, and optionally CeO2, La2O3, Nd2O3, Pr6O11, Sm2O3, Y2O3, and other rare earth oxides, comprising the steps of preparing an aqueous metal salt solution and forming a hydroxide precipitate slurry by combining the aqueous metal salt solution with an aqueous solution of a caustic alkali at a pH greater than 8.5 to precipitate out all the metal species. The variation in pH during the precipitation reaction is ±1. The invention also relates to composites formed by this method comprising 20-70 wt % Al2O3, 10-77 wt % ZrO2, 0-34 wt % CeO2 and 0-22 wt % REOs other than CeO2, and to composites per se comprising, on an oxide basis, 42-70 wt % Al2O3, 10-48 wt % ZrO2, 2-34 wt % CeO2 and 0-9 wt % REOs other than CeO2 and having the following properties after heating to 850° C. over four hours and holding at 850° C.
    Type: Grant
    Filed: December 30, 2005
    Date of Patent: May 10, 2011
    Assignee: Magnesium Elektron Limited
    Inventor: John G. Darab