Abstract: The subject matter of the invention is a method for producing composites, comprising mixed oxides of aluminum oxide and cerium/zirconium, hereinafter referred to briefly as Al/Ce/Zr oxide composite(s), using boehmite and soluble cerium/zirconium salts. Al/Ce/Zr oxide composites produced in this way have an increased thermal stability.

Abstract: Use of a ternary vanadate of formula (I): Fex MeIy MeIIz VO4 wherein MeI and MeII are different from each other and each stand for an element selected from the group consisting of Y, La, Ce, Pr, Nd, Sm, Er, Gd, Tb, Dy, Ho, Tm, Yb, Lu, Al, Bi and Sb and wherein x=0.05-0.9; y=0.05-0.9; z=0.05-0.9; x+y+z=1, as a catalyst for the oxidation of carbonaceous compounds in combustion engines.

Abstract: A composition of formula Ce1-a-b-cNaMbDcOx??I wherein M stands for one or more elements from the group of alkaline metals, except sodium, N is Bi and/or Sb, D is present, or is not present, and if present is selected from one or more of Mg, Ca, Sr, Ba; Y, La, Pr, Nd, Sm, Gd, Er; Fe, Zr, Nb, Al; a is a number within the range of 0<a?0.9, b is a number within the range of 0<b?0.3, c is a number within the range of 0<c?0.2, a plus b plus c is <1, and x is a number within the range of 1.2?x?2, and its use for exhaust gas aftertreatment systems of Diesel engines, gasoline combustion engines, lean burn engines and power plants.

Abstract: A process for the preparation of a calcined mixed oxide comprising Al-, Ce- and Zr-oxides, comprising the steps of providing an aqueous slurry comprising hydroxides of cerium and zirconium, contacting the hydroxides of cerium and zirconium with an alumina precursor to obtain an aqueous suspension of solids, isolating the solids from the aqueous suspension and drying to obtain a solid composition, calcining the solid composition of step (c) at a temperature from 450° C. to 1200° C. for at least 1 hour to obtain a calcined mixed oxide.

Abstract: A composition of formula Ce1-a-b-cNaMbDcOx??I wherein M stands for one or more elements from the group of alkaline metals, except sodium, N is Bi and/or Sb, D is present, or is not present, and if present is selected from one or more of Mg, Ca, Sr, Ba; Y, La, Pr, Nd, Sm, Gd, Er; Fe, Zr, Nb, Al; a is a number within the range of 0<a?0.9, b is a number within the range of 0<b?0.3, c is a number within the range of 0<c?0.2, a plus b plus c is <1, and x is a number within the range of 1.2?x?2, and its use for exhaust gas aftertreatment systems of Diesel engines, gasoline combustion engines, lean burn engines and power plants.

Abstract: A process for the preparation of a composition comprising Al—, Ce— and Zr-oxides, which process comprises the steps of (a) preparing an aqueous solution of a mixture of metal salts of cerium, zirconium and aluminium, which aqueous solution optionally comprises one or more salts of the Rare Earth Metals other than cerium, (b) adding to the solution obtained a base at temperatures from 0° C. to 95° C. and precipitating the mixed metal salts in the form of hydroxides or oxy-hydroxides, (d) treating the aqueous suspension obtained in step (b) with a surfactant, and (e) isolating the precipitate obtained in step (d) and treating said precipitate at a temperature from 450° C. to 1200° C., which process is characterized in that the alumina content is in the range from 35 to 80% by weight, and the surface area (BET) of the composition obtained, measured according to DIN (Deutsche Industrie Norm) 66131 after calcining for 2 hours at 1100° C.

Abstract: A catalyst composition comprising a vanadate represented by the formula XVO4/S, wherein XVO4 stands for a Bi-, Sb-, Ga- and/or Al-vanadate optionally in mixture with one or more rare earth metal-vanadates, or in mixture with one or more transition metal-vanadates, or in mixture with one or more transition metal-vanadates and one or more rare earth metal-vanadates, and S is a support comprising TiO2, optionally in combination with a dopant and a process for the preparation of such catalyst compositions.

Abstract: A process for the preparation of a composition comprising Al-, Ce- and Zr-oxides, which process comprises the steps of (a) preparing an aqueous solution of a mixture of metal salts of cerium, zirconium and aluminium, which aqueous solution optionally comprises one or more salts of the Rare Earth Metals other than cerium, (b) adding to the solution obtained a base at temperatures from 0° C. to 95° C. and precipitating the mixed metal salts in the form of hydroxides or oxy-hydroxides, (d) treating the aqueous suspension obtained in step (b) with a surfactant, and (e) isolating the precipitate obtained in step (d) and treating said precipitate at a temperature from 450° C. to 1200° C., which process is characterized in that the alumina content is in the range from 35 to 80% by weight, and the surface area (BET) of the composition obtained, measured according to DIN (Deutsche Industrie Norm) 66131 after calcining for 2 hours at 1100° C.

Abstract: Catalyst composition represented by the general formula REVO/S wherein RE is at least one of the group of rare earth metals Y, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Er and Yb in an amount of up to 6.0 wt.-%; V is vanadium in an amount of 0.2-2.5 wt.-%; O is oxygen in an amount of up to 3.5 wt.-%; and S is a support containing TiO2 in an amount of at least 70 wt.-%, with the rest being WO3 and optionally SiO2. This catalyst composition shows high removal efficiencies for NOx even after aging at 750° C.

Abstract: An yttria-based slurry composition comprising yttria, an aqueous silica binder system or an aqueous ammonium zirconium carbonate binder system and a fluorine compound, which is selected from ammonium fluoride, ammonium hydrogen difluoride, sodium fluoride, potassium fluoride, sodium hydrogen difluoride and/or potassium hydrogen difluoride and a method of stabilizing an yttria-based slurry composition comprising yttria and an aqueous silica binder system or an aqueous ammonium zirconium carbonate binder system which method comprises treating the composition, preferably treating the binder system, with a fluorine compound which is selected as indicated above.

Abstract: A catalyst composition represented by the general formula XVO4/S wherein XVO4 stands for TransitionMetal-Vanadate, or a mixed TransitionMetal-/RareEarth-Vanadate, and S is a support comprising TiO2.

Abstract: Method for producing a mold for use in casting reactive metals comprising preparing a slurry of a yttria-based refractory composition and a binder, and using said slurry as a mold facecoat by applying said slurry onto a surface of a mold pattern, wherein said yttria-based refractory composition is obtainable by (a) mixing particles of a yttria-based ceramic material and a fluorine containing dopant, and (b) heating the resulting mixture to effect fluorine-doping of said yttria-based ceramic material.

Abstract: Composition in the form of a solid-solid solution which is phase stable at 1150° C./36 hours and at 1200°/4 hours and which exhibits a thermal stability in surface area of at least 15 m2/g after treatment at 1100° C./4 hours, the composition comprising oxides of zirconium and cerium wherein the oxide of zirconium is enriched, an oxide of erbium, gadolinium, dysprosium, or yttrium as a stabilizer in an amount of 10% to 30% by weight, and optionally one ore more dopant, the use of such composition in a system for exhaust gas after treatment, a process which is appropriate for the preparation of such composition and compositions obtainable by such process.

Abstract: Method for producing a mold for use in casting reactive metals comprising preparing a slurry of a yttria-based refractory composition and a binder, and using said slurry as a mold facecoat by applying said slurry onto a surface of a mold pattern, wherein said yttria-based refractory composition is obtainable by (a) mixing particles of a yttria-based ceramic material and a fluorine containing dopant, and (b) heating the resulting mixture to effect fluorine-doping of said yttria-based ceramic material.

Abstract: A catalyst composition represented by the general formula XVO4/S wherein XVO4 stands for TransitionMetal-Vanadate, or a mixed TransitionMetal-/RareEarth-Vanadate, and S is a support comprising TiO2.

Abstract: The invention is directed to a process for the manufacture of a ceria based polishing composition, comprising (a) suspending an inorganic cerium salt or cerium hydroxide with a cerium content calculated as cerium oxide in the range of 50%-100% based on Total rare earth oxide (TREO) in an aqueous medium thereby obtaining an aqueous suspension, (b) treating said aqueous suspension with an acid or a salt of an acid selected from the group of HF, H3PO4 and H2SO4, thereby obtaining a solid suspended in said aqueous medium, (c) separating said solid from said aqueous medium, and (d) calcining the separated solid at a temperature between 750° C. and 1,200° C. and grinding the calcined solid to grain sizes in the range of 0.5 ?m to 5.0 ?m.

Abstract: Method for producing a mold for use in casting reactive metals comprising preparing a slurry of a yttria-based refractory composition and a binder, and using said slurry as a mold facecoat by applying said slurry onto a surface of a mold pattern, wherein said yttria-based refractory composition is obtainable by (a) mixing particles of a yttria-based ceramic material and a fluorine containing dopant, and (b) heating the resulting mixture to effect fluorine-doping of said yttria-based ceramic material.

Abstract: The invention relates to solid particles and to a method for the production thereof from a flowable starting material and a solid part, wherein the flowable starting material is split into droplets which are introduced along a trajectory into a solidification liquid in which they are solidified in the form of the solid particles. The invention is characterized by the use of solidification liquid and, if the flowable starting material contains actinide oxide, the solidification liquid steadily flows, thereby making it possible to produce solid particles having a greater sphericity and a narrow particle sized distribution.

Abstract: The invention is directed to a process for the manufacture of a ceria based polishing composition, comprising (a) suspending an inorganic cerium salt or cerium hydroxide with a cerium content calculated as cerium oxide in the range of 50%-100% based on Total rare earth oxide (TREO) in an aqueous medium thereby obtaining an aqueous suspension, (b) treating said aqueous suspension with an acid or a salt of an acid selected from the group of HF, H3PO4 and H2SO4, thereby obtaining a solid suspended in said aqueous medium, (c) separating said solid from said aqueous medium, and (d) calcining the separated solid at a temperature between 750° C. and 1,200° C. and grinding the calcined solid to grain sizes in the range of 0.5 ?m to 5.0 ?m.

Abstract: The present invention relates to a method for producing grain refined Mg and Mg alloys by solidifying molten Mg or Mg-alloys in the presence of ZrB2 or ZrC particles leading to a grain refined microstructure. The particles have an average particles size less than 20 ?m and larger 0.1 ?m and are either produced by an in situ formation within the melt or by a high temperature treatment of an intimate mixtures of zirconium oxide and carbon black and in case of ZrB2 additionally a suitable boron source like boron carbide or boron oxide or boron followed by a milling and de-agglomeration procedure. The method according to the invention leads to grain refined Mg or Mg alloys with an average grain size less than 100 ?m.