| 简介 |
Provided are : a novel rare earth element framework substituted zeolite which has enhanced NOx adsorption; a method for producing this rare earth element framework substituted zeolite; and a NOx adsorbent, a catalyst for automobile exhaust gases and the like, each of which uses this rare earth element framework substituted zeolite. A rare earth element framework substituted zeolite which is characterized by containing at least zeolite, and at least one or more rare earth elements selected from the group consisting of Ce, La, Nd and Pr, and which is also characterized in that : the content ratio of the rare earth elements is 1-15% by mass in total relative to the total mass; and some of the Al atoms and/or the Si atoms constituting the framework of the zeolite are substituted by the rare earth elements. |
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