Umicore Shokubai Japan Co., Ltd.

Takahiro Umeno

Masaya Hanzawa

Yoshiyuki Hayashi

It is an object to provide an exhaust gas purification catalyst for a lean burn engine having sufficient NOx purification performance. The exhaust gas purification catalyst for a lean burn engine according to the present invention has a catalyst component including noble metal and ceria supported on a three-dimensional structure. In the whole catalyst, the supported amount of ceria per 1 L of catalyst is 140 to 300 g/L, and in the whole catalyst, is 50 to 98% by mass with respect to the whole coated amount. Furthermore, it is characterized that 50% by mass or more of ceria is included in the same catalyst layer in which noble metal is included, and the amount of noble metal included in the catalyst layer is 0.1% by mass or more with respect to the amount of ceria included in the catalyst layer.

Exhaust gas purification catalyst for lean burn engine

The present invention is to provide a NOx storage reduction catalyst for purifying exhaust gas capable of efficiently removing carbon monoxide (CO), a hydrocarbon (HC), and a nitrogen oxide (NOx), in particular NOx, which are harmful components contained in exhaust gas. The NOx storage reduction catalyst for purifying exhaust gas of the present invention is characterized by being obtained by using a complex oxide of strontium and cerium as a catalytic active component, in which the complex oxide of strontium and cerium adsorbs 1.0 mL or less of oxygen per gram in a 400&#xb0; C. atmosphere, and sinters a precursor at 300&#xb0; C. or more.

NOx storage reduction catalyst for purifying exhaust gas and exhaust gas purification method using said catalyst

An exhaust gas purification method by which carbon monoxide (CO), hydrocarbon (HC), and nitrogen oxide (NOx), particularly NOx, which are hazardous components contained in an exhaust gas can be removed efficiently. The disclosure relates to a catalyst for exhaust gas purification including: a three-dimensional structure; and a catalyst component layer composed of one or more constituting layers on the three-dimensional structure, wherein the catalyst component layer contains (a) a noble metal-unsupported alumina having mesopores, (b) NOx storage material-supported cerium, (c) a refractory inorganic oxide, and (d) a noble metal, and the constituting layer of the uppermost surface among the one or more constituting layers contains (a) the noble metal-unsupported alumina and (b) the NOx storage material-supported cerium, a method for producing the same, and an exhaust gas purification method using the catalyst.

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Tokoname, Japan

Takahiro Umeno