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OwnerKazuhiko Koike, Masakazu Tanaka +2inventors
InventorsKazuhiko Koike, Masakazu Tanaka, Tomohiko Nakanishi, Jun Hasegawa
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This invention aims at providing a direct support ceramic support having less degradation of a catalyst due to thermal durability, and capable of keeping a high catalyst performance for a long time and suppressing a change of characteristics of a substrate ceramic. According to the invention, one or more kinds of constituent elements of a substrate ceramic such as cordierite are replaced by an element such as W to form a ceramic body having at least one kind of elements and fine pores each capable of directly supporting a catalyst component. These elements or fine pores are arranged at only an outermost surface layer portion (a depth corresponding to 1,000 unit crystal lattices or below) of the substrate ceramic. A catalyst body undergoing less thermal degradation and having small influences on the characteristics of the substrate ceramic is thus obtained.
A support having at least one kind of fine pores and elements each capable of directly supporting catalyst components on a surface of a substrate ceramic, wherein said fine pores and said elements each capable of directly supporting said catalyst components exist at only an outermost surface layer portion of said substrate ceramic.
A support comprising a substrate layer and a support layer formed on a surface of said substrate layer, wherein said support layer comprises a ceramic having at least one kinds of fine pores and elements each capable of directly supporting a catalyst component on a substrate ceramic surface.
A method of producing a support having an element capable of directly supporting a catalyst component at an outermost surface layer portion of a substrate ceramic, said element being a replacing element introduced by replacing one or more kinds of constituent elements of said substrate ceramic by an element or elements other than said constituent elements, said method comprising the steps of:
A method of producing a support having an element capable of directly supporting a catalyst component at an outermost surface layer portion of a substrate ceramic, said element being a replacing element introduced by replacing one or more kinds of constituent elements of said substrate ceramic by an element or elements other than said constituent elements, said method comprising the steps of:
Dependencies are inferred from the claim text.