IRON-PROMOTED ZEOLITE AND CATALYST MADE THEREFROM

The present disclosure provides a method of forming a selective catalytic reduction (SCR) catalyst, the method including receiving a first iron-promoted zeolite having a first iron content, and treating the iron-promoted zeolite with additional iron in an ion exchange step to form a second iron-promoted zeolite with a second iron content, the second iron content being higher than the first iron content. A selective catalytic reduction (SCR) catalyst composition including an ironpromoted zeolite having at least about 6 weight percent iron, based on total weight of the ironpromoted zeolite, wherein the iron content of the zeolite was added to the zeolite in at least two separate steps is also provided herein. 本公开提供了一种形成选择性催化还原(SCR)催化剂的方法，所述方法包含：接收具有第一铁含量的第一铁促进型沸石；以及在离子交换步骤中用另外的铁处理所述铁促进型沸石，以形成具有第二铁含量的第二铁促进型沸石，所述第二铁含量高于所述第一铁含量。本文还提供了一种选择性催化还原(SCR)催化剂组合物，其包含铁促进型沸石，按所述铁促进型沸石的总重量计，所述铁促进型沸石具有至少约6重量％的铁，其中所述沸石的铁含量在至少两个单独的步骤中添加到所述沸石中。