Alumina material

Patent metadata

Field	Value
Publication number	US-11578000-B2
Application number	US-201816757022-A
Country	US
Kind code	B2
Filing date	Oct 23, 2018
Priority date	Oct 24, 2017
Publication date	Feb 14, 2023
Grant date	Feb 14, 2023

Abstract

Provided is alumina material comprising alumina and zirconium, wherein in a radial distribution function obtained by Fourier-transforming an extended X-ray absorption fine structure (EXAFS) spectrum of a K absorption edge of the zirconium in the alumina material, the value of IB/IA is 0.5 or less where IA is a maximum intensity among the intensities of peaks present at 0.1 nm to 0.2 nm, and IB is a maximum intensity among the intensities of peaks present at 0.28 nm to 0.35 nm.

First claim

The invention claimed is:

1. Alumina material comprising alumina and zirconium, wherein in a radial distribution function obtained by Fourier-transforming an extended X-ray absorption fine structure (EXAFS) spectrum of a K absorption edge of the zirconium in the alumina material, a value of I B /I A is 0.5 or less where I A is a maximum intensity among intensities of peaks present at 0.1 nm to 0.2 nm, and I B is a maximum intensity among intensities of peaks present at 0.28 nm to 0.35 nm,
wherein a clear peak is not observed at 0.28 nm to 0.35 nm in the radial distribution function, and
wherein the clear peak is an upwardly projected peak having a ratio of an intensity of the peak to I A being 0.12 or less, and a half width of the peak being 0.06 nm or less.

2. The alumina material according to claim 1 , wherein an amount of zirconium in the alumina material is 0.1% by weight to 15% by weight based on a total weight of the alumina material.

3. The alumina material according to claim 1 , wherein the alumina material further comprises at least one of rare earth elements.

4. The alumina material according to claim 3 , wherein the at least one of rare earth elements is selected from the group consisting of cerium, yttrium, lanthanum, praseodymium, neodymium, and ytterbium.

5. The alumina material according to claim 3 , wherein the at least one of rare earth elements is cerium and/or lanthanum.

6. The alumina material according to claim 3 , wherein the at least one of rare earth elements is lanthanum.

7. The alumina material according to claim 1 , wherein a total amount of zirconium and the at least one of rare earth elements in the alumina material is 0.5% by weight to 15% by weight based on a total weight of the alumina material.

8. The alumina material according to claim 1 , wherein a specific surface area after the alumina material is subjected to heat treatment under an air atmosphere at 1200° C. for 4 hours is 50 m 2 /g or more.

9. The alumina material according to claim 1 , wherein the alumina comprises at least 80 wt % of γ alumina.

Assignees

• Sumitomo Chemical Co

Inventors

• Kawakami Yoshitaka
• Ando Hiroyuki

Classifications

• C01P2002/80

  defined by measured data other than those specified in group C01P2002/70 · CPC title

• C01P2002/50

  Solid solutions · CPC title

• C01P2006/13

  thermal stability thereof at high temperatures · CPC title

• C04B2235/322

  Transition aluminas, e.g. delta or gamma aluminas · CPC title

• C04B35/10 Primary

  based on aluminium oxide · CPC title