一种三元催化剂及其制备方法

Three-way catalyst and preparation method for same

Abstract

本发明提供了一种三元催化剂,以多孔陶瓷为基体,其上设有催化层,所述催化层包括第一催化层和第二催化层;所述第一催化层包括第一催化部分和第二催化部分,所述第二催化层包括第三催化部分和第四催化部分;其中,第三催化部分位于第一催化部分的正下方,第四催化部分位于第二催化部分的正下方。本发明还提供了该催化剂的制备方法。本发明制得的催化剂在老化前的HC、CO、NOx的催化性能好,并在一定条件的老化后,催化性能依然良好,体现了良好的抗老化能力。
The invention provides a three-way catalyst, wherein porous ceramic is used as a matrix, a catalysis layer is arranged on the porous ceramic; the catalysis layer comprises a first catalysis layer and a second catalysis layer; the first catalysis layer comprises a first catalysis part and a second catalysis part, and the second catalysis layer comprises a third catalysis part and a fourth catalysis part; and the third catalysis part is located just below the first catalysis part, and the fourth catalysis part is located just below the second catalysis part. The invention further provides a preparation method for the catalyst. The catalyst prepared by the preparation method provided by the invention is good in the catalytic performances of HC, CO and NOx before being aged, and still good in the catalytic performances after being aged under certain conditions, thus reflecting a good anti-ageing capacity.

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    WO-2017204008-A1November 30, 2017株式会社キャタラーExhaust gas purifying catalyst