Exhaust gas control catalyst and manufacturing method thereof
AssigneeToyota Jidosha Kabushiki Kaisha
InventorKotaro Hayashi
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Abstract
A catalyst which can maintain a concentration of a NOx, storage material in a catalyst supporting layer at an appropriate value is provided. There is provided an exhaust gas control catalyst including a base material; a catalyst supporting layer which is formed on a surface of the base material and which supports noble metal and a NOx, storage material; and a lower layer which is formed at a portion that is in the base material and that is below the catalyst supporting layer, and which supports a NOx storage material. A concentration of the NOx, storage material supported by the lower layer is higher than a concentration of the NOx storage material which is supported by the catalyst supporting layer. Also, a manufacturing method of the exhaust gas control catalyst is provided.
Claims3
An exhaust gas control catalyst, comprising:
- a base material;
- a catalyst supporting layer which is formed on a surface of the base material and which supports noble metal and a NOx storage material;
- and
- a lower layer which is formed at a portion that is in the base material and that is below the catalyst supporting layer, and which supports a NOx storage material, wherein
- a concentration of the NOx storage material supported by the lower layer is higher than a concentration of the NOx storage material which is supported by the catalyst supporting layer.
A manufacturing method of an exhaust gas control catalyst, comprising:
- forming a layer which supports a NOx storage material in advance in a base material at a surface portion;
- and
- forming a catalyst supporting layer which supports noble metal and a NOx storage material on a surface of the lower layer.
Dependencies are inferred from the claim text.