Texaco Inc.

Arnulf Muan

Mitri S Najjar

Michael W Becker

Nitri S Najjar

Vanadium garnet materials and a method for their preparation. The vanadium garnet material has a trivalent vanadium cation and a composition that falls within a specific prismatic-shaped volume in a quaternary composition diagram of MnO, CaO, V.sub.2 O.sub.3, and SiO.sub.2. In the process, specific amounts of separately pre-heated V.sub.2 O.sub.3, MnO, CaO and SiO.sub.2 powders are ground and mixed together, pelletized, heated at a temperature in the range of about 1100.degree. C. to 1400.degree. C. for 12 to 48 hours in an atmosphere of carefully selected oxygen pressure comprising a gas mixture of high purity CO.sub.2 and H.sub.2 to produce a liquid melt, and cooling, crystallizing out and separating said vanadium garnet material. A typical vanadium garnet material has the formula Mn.sub.1.3 Ca.sub.1.7 V.sub.2 Si.sub.3 O.sub.12. The vanadium garnet materials may be used in laser applications.

Vanadium garnet materials in the MnO-CaO-V.sub.2 0.sub.3 -SiO.sub.2

The present invention pertains to novel phases involving FeO, V.sub.2 O.sub.3 and CaO and the method for their preparation. The solid compositions involving FeO--V.sub.2 O.sub.3 --CaO fall within the shaded area of a polygon in a ternary composition diagram of FeO, V.sub.2 O.sub.3 and CaO as shown in the drawing herein e.g., FIG. 1. The compositions may be used as a catalyst for oxidation or reduction reactions.

Compositions involving FeO--V.sub.2 O.sub.3 --CaO

The present invention pertains to novel vanadium spinel materials and a method for their preparation. Each vanadium spinel material has a trivalent vanadium cation and is crystallized from a liquid having a composition that falls within a specific polygon shaped area in a ternary composition diagram of V.sub.2 O.sub.3 -FeO-SiO.sub.2 as shown in the drawing herein e.g., FIG. 1. The compositions may be used as a catalyst for oxidation reactions.

Composition involving V.sub.2 O.sub.3 -FeO-SiO.sub.2 and process for

Vanadium garnet materials and a method for their preparation. The vanadium garnet material has a trivalent vanadium cation and a composition that falls within a specific prismatic-shaped volume in a quaternary composition diagram of MnO, CaO, V.sub.2 O.sub.3, and SiO.sub.2. The prismatic-shaped volume represents compositions of liquids with which said vanadium garnet is in equilibrium on the liquidus surface and from which the vanadium garnet phase is crystallized. A typical vanadium garnet material has the formula Mn.sub.1.3 Ca.sub.1.7 V.sub.2 Si.sub.3 O.sub.12, as provided in the drawing by point F. The vanadium garnet materials may be used in laser applications.

Vanadium garnet materials in the MnO-CaO-V.sub.2 O.sub.3 -SiO.sub.2

The present invention pertains to novel vanadium spinel materials and a method for their preparation. Each vanadium spinel material has a trivalent vanadium cation and is crystallized from a liquid having a composition that falls within a specific polygon shaped area in a ternary composition diagram of V.sub.2 O.sub.3 -MgO-SiO.sub.2 as shown in the drawing herein e.g., FIG. 1. The compositions may be used as a catalyst for oxidation reactions.

Ternary composition of V.sub.2 O.sub.3 -MgO-SiO.sub.2

The present invention pertains to novel vanadium spinel materials and a method for their preparation. Each vanadium spinel material has a trivalent vanadium cation and is crystallized from a liquid having a composition that falls within a specific polygon shaped area in a ternary composition diagram of V.sub.2 O.sub.3 --MnO--SiO.sub.2 as shown in the drawing herein e.g., FIG. 1. The compositions may be used as a catalyst for oxidation reactions.

Vanadium spinel materials in the V.sub.2 O.sub.3 --MnO--SiO.sub.2 system

The present invention pertains to novel phases involving V.sub.2 O.sub.3 and CaO and the method for their preparation. The solid compositions involving V.sub.2 O.sub.3 and CaO fall on three vertical lines and within the shaded areas of four polygons in a binary composition diagram of V.sub.2 O.sub.3 and CaO as shown in the drawing herein e.g., FIG. 1. The composition may be used as a catalyst for oxidation or reduction reactions.

Compositions involving V.sub.2 O.sub.3 -CaO

The present invention pertains to novel phases involving V.sub.2 O.sub.3, Al.sub.2 O.sub.3 and CaO, and the method for their preparation. The solid compositions involving V.sub.2 O.sub.3, Al.sub.2 O.sub.3, and composition diagram of V.sub.2 O.sub.3 -Al.sub.2 O.sub.3 -CaO as shown in the drawing herein e.g., FIG. 1. The composition may be used as a catalyst for oxidation or reduction reactions.

Compositions involving V.sub.2 O.sub.3 -Al.sub.2 O.sub.3 -CaO

The present invention pertains to novel solid solutions involving Cr.sub.2 O.sub.3, V.sub.2 O.sub.3 and TiO.sub.2 and the method for their preparation. The solid compositions involving Cr.sub.2 O.sub.3, V.sub.2 O.sub.3 and TiO.sub.2 fall within the shaded area of a polygon in a ternary composition diagram of Cr.sub.2 O.sub.3, V.sub.2 O.sub.3 and TiO.sub.2 as shown in the drawing herein e.g., FIG. 1. The composition may be used as an oxidation catalyst or in the manufacture of high temperature refractories.

Compositions involving Cr.sub.2 --O.sub.3 --V.sub.2 O.sub.3 --TiO.sub.2

The present invention pertains to novel solid solutions involving MnO, V.sub.2 O.sub.3 and TiO.sub.2 and the method for their preparation. The solid compositions involving MnO, V.sub.2 O.sub.3 and TiO.sub.2 fall within the shaded area of a polygon in a ternary composition diagram of MnO, V.sub.2 O.sub.3 and TiO.sub.2 as shown in the drawing herein e.g., FIG. 1. The composition may be used as an oxidation catalyst or in the manufacture of high temperature refractories.

Compositions involving MnO--V.sub.2 O.sub.3 --TiO.sub.2

Novel oxidation-reduction catalysts and the method for their preparation. The materials comprise stable phases involving V.sub.2 O.sub.3 and TiO.sub.2 and mixtures of said phases and have compositions that fall within specific areas in a binary composition diagram of V.sub.2 O.sub.3 and TiO.sub.2. A typical VT material has the formula V.sub.2 TiO.sub.5. A typical E material has a formula V.sub.2 Ti.sub.2 O.sub.7 ; and, a typical .eta. material has the formula V.sub.2 Ti.sub.3 O.sub.9.

Stable solid phases involving V.sub.2 O.sub.3 - TiO.sub.2 and mixtures

A novel oxidation catalyst or refractory and the method for its preparation. The material comprises substitutional solid solutions involving MgO, V.sub.2 O.sub.3 and TiO.sub.2 and having compositions that fall within a specific polygon in a ternary composition diagram of MgO, V.sub.2 O.sub.3 and TiO.sub.2. A typical material has the composition in Wt %; MgO 17, V.sub.2 O.sub.3 61 and TiO.sub.2 22, and consists of the phases spinel having the formula Mg.sub.1.21 V.sub.1.58 Ti.sub.0.21 O.sub.4 and pseudobrookite having the formula Mg.sub.0.20 V.sub.1.60 Ti.sub.1.20 O.sub.5.

Solid solutions involving MGO-V.sub.2 O.sub.3 -TiO.sub.2

The present invention pertains to novel solid solutions involving FeO, V.sub.2 O.sub.3 and TiO.sub.2 and the method for their preparation. The solid compositions involving FeO, V.sub.2 O.sub.3 and TiO.sub.2 fall within the shaded area of a polygon in a ternary composition diagram of FeO, V.sub.2 O.sub.3 and TiO.sub.2 as shown in the drawing herein e.g., FIG. 1. The composition may be used as an oxidation catalyst or in the manufacture of high temperature refractories.

Compositions involving FeO-V.sub.2 O.sub.3 -TiO.sub.2

The present invention pertains to novel solid solutions involving NiO, V.sub.2 O.sub.3 and TiO.sub.2 and the method for their preparation. The compositions involving NiO, V.sub.2 O.sub.3 and TiO.sub.2 fall within the shaded area of a polygon in a ternary composition diagram of NiO, V.sub.2 O.sub.3 and TiO.sub.2 as shown in the drawing herein e.g., FIG. 1. The composition may be used as an oxidation catalyst or in the manufacture of high temperature refractories.

Composition involving NiO-V.sub.2 O.sub.3 TiO.sub.2

The present invention pertains to novel solid solutions involving V.sub.2 O.sub.3, ZrO.sub.2 and TiO.sub.2 and the method for their preparation. The compositions involving V.sub.2 O.sub.3, ZrO.sub.2 and TiO.sub.2 fall within the shaded area of a polygon in a ternary composition diagram of V.sub.2 O.sub.3, ZrO.sub.2 and TiO.sub.2 as shown in the drawing herein e.g., FIG. 1. These materials may be used as an oxidation catalyst or in the manufacture of high temperature refractories.

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Lacey Spring, VA, United States of America

Arnulf Muan