Abstract:
Provided is a process for the production of a zeolitic material having a BEA-type framework structure comprising YO2 and X2O3. The 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; and (3) subjecting the zeolitic material having a BEA-type framework structure to an ion-exchange procedure with Cu and/or Fe. Y is a tetravalent element, and X is a trivalent element. The mixture does not contain an organotemplate as structure-directing agent, and the total amount of Cu and/or Fe in the ion-exchanged material ranges from 0.1 to 25 wt.-% calculated as Fe2O3 and CuO. Also provided is a zeolitic material having a BEA-type framework structure, and a method for the treatment of NOx by selective catalytic reduction (SCR).
Abstract translation:提供了一种生产具有包含YO 2和X 2 O 3的BEA型骨架结构的沸石材料的方法。 该方法包括以下步骤:(1)制备包含一种或多种YO源,X2O3的一种或多种来源的混合物,以及包含一种或多种具有BEA型骨架结构的沸石材料的晶种; (2)使混合物结晶; 和(3)使具有BEA型骨架结构的沸石材料与Cu和/或Fe进行离子交换程序。 Y是四价元素,X是三价元素。 该混合物不含作为结构导向剂的有机模板,并且离子交换材料中的Cu和/或Fe的总量为0.1至25重量%,以Fe 2 O 3和CuO计算。 还提供了具有BEA型骨架结构的沸石材料和通过选择性催化还原(SCR)处理NOx的方法。
Abstract:
A zeolitic material having framework type CHA, comprising a transition metal M and an alkali metal A, and having a framework structure comprising a tetravalent element Y, a trivalent element X and O, wherein the transition metal M is a transition I metal of groups 7 to 12 of the periodic table, A is one or more of K and Cs, Y is one or more of Si, Ge, Ti, Sn and Zr, and X is one or more of Al, B, Ga and In. A process for preparing such a zeolitic material. Use of such a zeolitic material.
Abstract:
A rare earth element containing zeolitic material having an AEI-type framework structure, the framework structure of the zeolitic material comprising SiO2 and X2O3, X being a trivalent element, wherein the zeolitic material contains one or more rare earth elements as counter-ions at the ion exchange sites of the framework structure, and wherein the zeolitic material is obtainable and/or obtained according to a process involving the hydrothermal treatment of the rare earth element containing zeolitic material at a temperature in the range of from 400 to 1,000° C. A coated monolith substrate comprising a rare earth element containing zeolitic material having an AEI-type framework structure, wherein the zeolitic material is supported on the monolith substrate. A process for the production of a coated monolith substrate comprising a rare earth element containing zeolitic material having an AEI-type framework structure.