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US 7,223,716 B1Granted
Ceramic support capable of supporting a catalyst, a catalyst-ceramic body and processes for producing same
AssigneesNippon Soken, Inc., Denso Corporation
InventorsKazuhiko Koike, Tomohiko Nakanishi, Takeshi Ueda, Masakazu Tanaka
Life of this patent
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Abstract
A ceramic support capable of supporting a catalyst comprising a ceramic body having fine pores with a diameter or width up to 1000 times the ion diameter of a catalyst component to be supported on the surface of the ceramic body, the number of the fine pores being not less than 1×1011 pores per liter, is produced by introducing oxygen vacancies or lattice defects in the cordierite crystal lattice or by applying a thermal shock to form fine cracks.
Claims8
A process for producing a catalyst-body, comprising:
- preparing cordierite materials comprising a Si source, an Al source and a Mg source as well as a binder, some of said Si, Al and Mg sources being replaced by a noble metal-containing compound,
- forming said cordierite materials into a honeycomb shape,
- heating said honeycomb shape to remove said binder, and
- firing said honeycomb shape in a reduced pressure atmosphere at a pressure of not higher than 4000 Pa, a reducing atmosphere, an oxygen-containing atmosphere or an oxygen-free atmosphere to form a catalyst-ceramic body comprising a ceramic support of a honeycomb structure comprising a cordierite composition.
1 more element
A process for producing a catalyst-ceramic body, comprising:
- preparing cordierite materials comprising a Si source, an Al source and a Mg source as well as a binder, some of said Si, Al and Mg sources being replaced by a noble metal-containing compound and a Ce-containing compound,
- forming said cordierite materials into a honeycomb shape,
- heating said honeycomb shape to remove said binder, and
- firing said honeycomb shape in a reduced pressure atmosphere at a pressure of not higher than 4000 Pa, a reducing atmosphere, an oxygen-containing atmosphere or an oxygen-free atmosphere to form a catalyst-ceramic body comprising a ceramic support of a honeycomb structure comprising a cordierite composition.
1 more element
Dependencies are inferred from the claim text.