Abstract:
The present invention relates to a process for the preparation of a zeolitic material having a CHA framework structure, said zeolitic material comprising zeolite crystals having a core-shell structure, wherein said process comprises the steps of (1) providing a mixture comprising one or more sources for Z2O5, one or more sources for X2O3, optionally one or more structure directing agents, and seed crystals having a CHA framework structure, wherein the CHA framework structure of the seed crystals comprises YO2, X2O3, and optionally Z2O5, and wherein the seed crystals have a diameter of 450 nm or greater; (2) crystallizing the mixture provided in (1) to afford zeolite crystals comprising a core of seed crystal provided in step (1) and a shell crystallized on the seed crystal; wherein Z is a pentavalent element, Y is a tetravalent element, and X is a trivalent element.
Abstract translation:本发明涉及一种制备具有CHA骨架结构的沸石材料的方法,所述沸石材料包含具有核 - 壳结构的沸石晶体,其中所述方法包括以下步骤:(1)提供包含一种或多种 Z 2 O 5的源,X 2 O 3,任选的一种或多种结构导向剂的一种或多种来源,以及具有CHA骨架结构的晶种,其中晶种的CHA骨架结构包含YO 2,X 2 O 3和任选的Z 2 O 5,并且其中所述种子 晶体的直径为450nm以上; (2)使(1)中提供的混合物结晶,得到包含步骤(1)中提供的晶种核心的沸石晶体和在晶种上结晶的壳; 其中Z为五价元素,Y为四价元素,X为三价元素。
Abstract:
The present invention relates to a process for the preparation of a zeolitic material having a CHA framework structure, said zeolitic material comprising zeolite crystals having a core-shell structure, wherein said process comprises the steps of (1) providing a mixture comprising one or more sources for Z2O5, one or more sources for X2O3, optionally one or more structure directing agents, and seed crystals having a CHA framework structure, wherein the CHA framework structure of the seed crystals comprises YO2, X2O3, and optionally Z2O5, and wherein the seed crystals have a diameter of 450 nm or greater; (2) crystallizing the mixture provided in (1) to afford zeolite crystals comprising a core of seed crystal provided in step (1) and a shell crystallized on the seed crystal; wherein Z is a pentavalent element, Y is a tetravalent element, and X is a trivalent element.
Abstract translation:本发明涉及一种制备具有CHA骨架结构的沸石材料的方法,所述沸石材料包含具有核 - 壳结构的沸石晶体,其中所述方法包括以下步骤:(1)提供包含一种或多种 Z 2 O 5的源,X 2 O 3,任选的一种或多种结构导向剂的一种或多种来源,以及具有CHA骨架结构的晶种,其中晶种的CHA骨架结构包含YO 2,X 2 O 3和任选的Z 2 O 5,并且其中所述种子 晶体的直径为450nm以上; (2)使(1)中提供的混合物结晶,得到包含步骤(1)中提供的晶种核心的沸石晶体和在晶种上结晶的壳; 其中Z为五价元素,Y为四价元素,X为三价元素。