Title:
COMPLEX OXIDE, METHOD FOR PRODUCING SAME, AND EXHAUST GAS PURIFYING CATALYST
Document Type and Number:
WIPO Patent Application WO/2011/078315
Kind Code:
A1
Abstract:
Disclosed are: a complex oxide which has excellent heat resistance and excellent catalytic activity and is capable of maintaining high pore volume even if used in a high temperature environment; a method for producing the complex oxide; and an exhaust gas purifying catalyst which uses the complex oxide. Specifically disclosed is a complex oxide which contains cerium and at least one element selected from aluminum, silicon and rare earth metals including yttrium but not including cerium, at a mass ratio within the range from 85:15 to 99:1 in terms of oxides. The complex oxide has physical properties such that the volume of pores having a pore diameter of 200 nm or less after 5-hour firing at 900°C is not less than 0.30 cm3/g, preferably not less than 0.40 cm3/g. In particular, the complex oxide is suitable as a promoter for an exhaust gas purifying catalyst that is used in an automobile or the like.
Inventors:
OHTAKE NAOTAKA (JP)
YOKOTA KAZUHIKO (CN)
YOKOTA KAZUHIKO (CN)
Application Number:
PCT/JP2010/073306
Publication Date:
June 30, 2011
Filing Date:
December 24, 2010
Export Citation:
Assignee:
ANAN KASEI CO LTD (JP)
OHTAKE NAOTAKA (JP)
YOKOTA KAZUHIKO (CN)
OHTAKE NAOTAKA (JP)
YOKOTA KAZUHIKO (CN)
International Classes:
B01D53/86; B01J23/10; B01J33/00; C01F17/10; C01F17/235; C01F17/241; F01N3/10
Domestic Patent References:
| WO2008156219A1 | 2008-12-24 |
Foreign References:
| JP2004002148A | 2004-01-08 | |||
| JP2008150237A | 2008-07-03 | |||
| JP2009530091A | 2009-08-27 | |||
| JPS6256322A | 1987-03-12 | |||
| JPH05270824A | 1993-10-19 |
Other References:
A.CORMA ET AL.: "Synthesis and catalytic properties of thermally and hydrothermally stable, high-surface-area Si02-Ce02 mesostructured composite materials and their application for the removal of sulfur compounds from gasoline", JOURNAL OF CATALYSIS, vol. 224, 2004, pages 441 - 448, XP004506504
See also references of EP 2518018A4
See also references of EP 2518018A4
Attorney, Agent or Firm:
SAKAI Hajime et al. (JP)
Sakai 1 (JP)
Sakai 1 (JP)
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