The invention relates to a phosphor for a UV emitting device, having the formula Na.sub.1+xCa.sub.1−2xPO.sub.4:PR3.sup.+.sub.x wherein 0<x<0.5.

The invention relates to a phosphor for a UV emitting device, having the formula Na.sub.1+xCa.sub.1−2xPO.sub.4:PR3.sup.+.sub.x wherein 0<x<0.5.

Doped cerium oxide particles may comprise about 90 weight percent (wt. %) to about 99.9 wt. % cerium oxide (CeO.sub.2) and up to about 10 wt. % dopant. Exemplary doped cerium oxide particles may have a BET specific surface area of more than 150 m.sup.2/g after calcination at 500° C. for 8 hours. Exemplary doped cerium oxide particles may have an oxygen storage capacity (OSC) of more than 900 μmol.Math.O.sub.2/g after calcination at 500° C. for 8 hours.

Doped cerium oxide particles may comprise about 90 weight percent (wt. %) to about 99.9 wt. % cerium oxide (CeO.sub.2) and up to about 10 wt. % dopant. Exemplary doped cerium oxide particles may have a BET specific surface area of more than 150 m.sup.2/g after calcination at 500° C. for 8 hours. Exemplary doped cerium oxide particles may have an oxygen storage capacity (OSC) of more than 900 μmol.Math.O.sub.2/g after calcination at 500° C. for 8 hours.

A mesoporous ozonation catalyst including a cerium-titanium-zirconium composite oxide. The catalyst is in the form of a solid spherical particle having a diameter of between 0.7 and 1.2 mm. The solid spherical particle exhibits lattice fringes under transmission electron microscope, and the lattice fringes have a spacing between 0.332 and 0.339 nm.

A mesoporous ozonation catalyst including a cerium-titanium-zirconium composite oxide. The catalyst is in the form of a solid spherical particle having a diameter of between 0.7 and 1.2 mm. The solid spherical particle exhibits lattice fringes under transmission electron microscope, and the lattice fringes have a spacing between 0.332 and 0.339 nm.

The present disclosure relates a hydrogen-annealed bimetallic oxide of Formula I: A.sub.xO.sub.2—B.sub.yO.sub.z, wherein the A is a metal selected from Hf, Ti, or Zr; B is a metal selected from Ce, Zn, Fe or Co; x is in the range of 1-2; y is in the range of 1-4; and z is in the range of 1-6. The present disclosure further relates to a convenient process for preparing the hydrogen-annealed bimetallic oxide and a method for catalytically treating an exhaust stream is also disclosed herein.

The present disclosure relates a hydrogen-annealed bimetallic oxide of Formula I: A.sub.xO.sub.2—B.sub.yO.sub.z, wherein the A is a metal selected from Hf, Ti, or Zr; B is a metal selected from Ce, Zn, Fe or Co; x is in the range of 1-2; y is in the range of 1-4; and z is in the range of 1-6. The present disclosure further relates to a convenient process for preparing the hydrogen-annealed bimetallic oxide and a method for catalytically treating an exhaust stream is also disclosed herein.

Nanosheets of Ca.sup.2+ and Y.sup.3+, with CO.sub.3.sup.2− in the interlayer with a uniform diameter and lengths of several tens of microns have been successfully synthesized in a hydrotalcite layer structure (a layered double hydroxide), using a hydrothermal method. The formation mechanism of lamellar CaY—CO.sub.3.sup.2− layered double hydroxides (LDHs) depends on the molar ratio of Ca and Y and the reaction time and temperature. The resulting LDH materials exhibit excellent affinity and selectivity for heavy transition metal and metalloid ions.

Disclosed herein, in certain embodiments, are compounds, methods, tools, and abrasive materials comprising mixed transition metal dodecaborides.