公开(公告)号：US5366720A

公开(公告)日：1994-11-22

申请号：US171801

申请日：1993-12-23

申请人： Alex J. Caglione ,  Thomas R. Cannan ,  Nanette Greenlay ,  Richard J. Hinchey

发明人： Alex J. Caglione ,  Thomas R. Cannan ,  Nanette Greenlay ,  Richard J. Hinchey

IPC分类号： B01J29/08 ,  C01B39/02 ,  C01B33/34

CPC分类号： B01J29/08 ,  C01B39/026 ,  Y10S423/21

摘要： Low silica forms of faujasite-type zeolites are prepared from more siliceous forms of the same zeolite species by contacting the starting zeolite with a highly caustic concentrated sodium aluminate solution at elevated temperatures. In view of the fact that the process does not favor the formation of undesirable impurity phases such as zeolite A and thus does not require the presence of zeolite A nucleation inhibitors, the process is particularly advantageous in the production of forms of zeolite X having Si/Al.sub.2 molar ratios below 2.5.

摘要翻译： 通过在高温下使起始沸石与高碱苛性铝酸钠溶液接触，由更多的硅质形式的相同沸石物质制备八面沸石型沸石的低二氧化硅形式。 鉴于该方法不利于形成不需要的杂质相如沸石A，因此不需要存在沸石A成核抑制剂，该方法特别有利于生产具有Si / Al2摩尔比低于2.5。