Bimetallic exchange zeolite beta by synthesis without using organic template and method of using it in selective catalytic reduction of NOx

摘要

The present invention is a method for producing a zeolitic material having a BEA-type framework structure comprising YO2 and X2O3, comprising: (1) a mixture comprising one or more sources of YO2 and one or more sources of X2O3 (2) a step of crystallizing the mixture obtained in step (1); (3) a zeolitic material having a BEA-type framework structure obtained in step (2) is subjected to an ion exchange procedure with Cu. And (4) including a step of subjecting the Cu ion-exchanged zeolitic material obtained in step (3) to an ion exchange procedure with Fe, wherein Y is a tetravalent element, and X is a trivalent element. The mixture provided in step (1) and crystallized in step (2) further comprises a seed crystal comprising one or more zeolitic materials having a BEA type framework structure. Thus, the mixture brought about in step (1) and crystallized in step (2) does not contain an organic template as a structure directing agent, as well as the zeolitic material itself with a BEA framework structure, and in particular selective catalytic reduction ( SCR) to a method for using it in a method for treating NOx.