申请人:Bull Ivor
公开号:US20120244066A1
公开(公告)日:2012-09-27
The present invention relates to a process for the preparation of zeolites having CHA framework structure and a composition comprising the molar ratio (n SiO
2
):X2O
3
, wherein X is a trivalent element, and wherein n is at least 10, the process comprising (i) preparation of an aqueous solution containing at least one source for X
2
O
3
, wherein X is selected from Al, B, Ga, and a mixture of two or more, and at least one source for SiO
2
, at least one organic structure directing agent (SDA) other than Tetrame-thylammonium hydroxide (TMAOH), acting as a template for the CHA structure, and Tetramethylammonium hydroxide (TMAOH), wherein the SDA or mixtures thereof are employed in such amounts that the aqueous solution in (i) exhibits a molar ratio of SDA:TMAOH of 0.01 to 5; (ii) hydrothermal crystallization of the aqueous solution according to (i); wherein the aqueous solution of (i) contains copper in an amount less than 0.005 Cu:((n YO
2
)+X
2
O
3
) where n is in the range of 10 to 50. The present invention also relates to the zeolitic materials obtainable and/or obtained by this process as well as to a zeolitic material as such, having framework structure CHA, having a composition comprising the molar ratio (n SiO
2
):X
2
O
3
, wherein X is a trivalent element and n is at least 10, and wherein the crystal size, as determined from Scanning Electron Microscopy, is greater than 1 micrometer and wherein the chabazite framework is phase-pure having an impurity of other zeolitic frameworks, such as RUT as determined by X-ray Diffraction, of less than 5%.
本发明涉及一种制备具有CHA骨架结构的沸石和组成物的过程,包括摩尔比(n SiO2):X2O3,其中X是三价元素,n至少为10,该过程包括:(i)制备含有至少一种X2O3源的水溶液,其中X选自Al、B、Ga和两种或更多混合物,以及至少一种SiO2源、至少一种有机结构导向剂(SDA)作为CHA结构的模板,除四甲基铵氢氧化物(TMAOH)外,还包括四甲基铵氢氧化物(TMAOH),其中SDA或其混合物的用量使得(i)中的水溶液呈现出SDA:TMAOH的摩尔比为0.01至5;(ii)根据(i)的水溶液进行水热晶化;其中(i)的水溶液中含有铜的量小于0.005 Cu:((n YO2)+X2O3),其中n在10至50的范围内。本发明还涉及通过该过程获得和/或获得的沸石材料,以及具有CHA骨架结构的沸石材料,其组成物包括摩尔比(n SiO2):X2O3,其中X是三价元素,n至少为10,晶体尺寸从扫描电子显微镜确定,大于1微米,且方解石骨架是相纯的,其他沸石骨架的杂质,例如RUT,由X射线衍射确定小于5%。