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US 5,849,661 AGranted
Automotive exhaust catalyst
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsTetsuya Yamashita, Shinichi Takeshima, Toshiaki Tanaka, Satomi Itakura
Life of this patent
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Abstract
An automotive exhaust catalyst includes an alumina support having pores, an NO.sub.x, storage member loaded in the pores having a pore diameter of from 10 to 30.ANG. at least, and a noble metal element loaded on the alumina support. The automotive exhaust catalyst can store NO.sub.x, in a large amount in fuel-lean or oxygen-rich atmosphere, and inhibit the alumina support from sintering, because the NO.sub.x storage member is loaded in a highly dispersed manner.
Claims10
An automotive catalyst comprising:
- an alumina support having pores having a diameter of at least 10 .ANG., wherein at least a first portion of said pores have a diameter of from 10 to 30 .ANG. and at least a second portion of said pores have a diameter of greater than 30 .ANG.;
- an NO.sub.x storage member loaded in the pores having a diameter of at least 10 .ANG., wherein the amount of the NO.sub.x storage member loaded in all of said pores having a diameter of at least 10 .ANG. is substantially uniform with respect to the surface area of said pores;
- and
- a noble metal element loaded on said alumina support.
1 more element
Dependencies are inferred from the claim text.