IRON- AND COPPER-CONTAINING ZEOLITE BETA FROM ORGANOTEMPLATE-FREE SYNTHESIS AND USE THEREOF IN THE SELECTIVE CATALYTIC REDUCTION OF NOX

摘要

The present invention relates to a process for the production of a zeolitic material having a BEA-type framework structure comprising YO₂ and X₂O₃, wherein said process comprises the steps of (1) preparing a mixture comprising one or more sources for YO₂, one or more sources for X₂O₃, and seed crystals comprising one or more zeolitic materials having a BEA-type framework structure; (2) crystallizing the mixture obtained in step (1); and (3) subjecting the zeolitic material having a BEA-type framework structure obtained in step (2) to an ion-exchange procedure with Cu and/or Fe; wherein Y is a tetravalent element, and X is a trivaient element, wherein the mixture provided in step (1) and crystallized in step (2) does not contain an organotemplate as structure-directing agent, and wherein the total amount of Cu and/or Fe in the ion-exchanged material obtained in step (3) ranges from 0.1 to 25 wt.-% calculated as Fe₂O₃ and CuO, as well as to a zeolitic material having a BEA-type framework structure which may be obtained according to said process, and to a method for the treatment of NO_x by selective catalytic reduction (SCR) using said zeolitic material.