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    Methods of controlling polymorphism in organic-free synthesis of Na-zeolites and zeolite crystals formed therefrom
    1.
    发明授权
    Methods of controlling polymorphism in organic-free synthesis of Na-zeolites and zeolite crystals formed therefrom 有权

    公开(公告)号：US10421666B2

    公开(公告)日：2019-09-24

    申请号：US15615969

    申请日：2017-06-21

    申请人： UNIVERSITY OF HOUSTON SYSTEM

    发明人： Jeffrey D. Rimer ,  Miguel Maldonado ,  Matthew D. Oleksiak

    IPC分类号： C01B39/46 ,  C01B39/52 ,  B01J29/70 ,  C01B39/02 ,  C01B39/50

    摘要： Methods of controlling crystal polymorphism in organic-free synthesis of Na-Zeolites and the zeolite crystals formed using those methods are provided. The methods disclosed herein create certain types of zeolite crystals more efficiently than other previously known methods. The methods also create certain types of zeolite crystals in a form and concentration not previously disclosed. The methods disclosed herein generally comprise using solutions with varying ratios of silicon (Si), aluminum (Al), hydroxide (OH), and water. Some implementations of the invention disclosed include efficient methods of producing nearly pure cancrinite (CAN), methods of obtaining sodalite in solutions with a high Si/Al ratio, and a method of forming thin, platelet-like ANA crystals with a width of less than about 1 μm and a length of at least about 3 μm.

    Preparation of zeolites using low silica/alumina zeolites as a source of aluminum
    6.
    发明授权
    Preparation of zeolites using low silica/alumina zeolites as a source of aluminum 失效
    使用低二氧化硅/氧化铝沸石作为铝源制备沸石

    公开(公告)号：US5340563A

    公开(公告)日：1994-08-23

    申请号：US908680

    申请日：1992-06-30

    申请人： Stacey I. Zones ,  Yumi Nakagawa

    发明人： Stacey I. Zones ,  Yumi Nakagawa

    IPC分类号： B01J29/70 ,  C01B39/04 ,  C01B39/14 ,  C01B39/22 ,  C01B39/24 ,  C01B39/42 ,  C01B39/46 ,  C01B39/48 ,  C01B39/52 ,  C01B33/26

    CPC分类号： B01J29/7034 ,  B01J29/70 ,  B01J29/7007 ,  B01J29/7038 ,  C01B39/04 ,  C01B39/42 ,  C01B39/48

    摘要： An improved method of synthesizing large pore zeolites is disclosed and claimed. The method comprises preparing a reaction mixture containing a source zeolite on alkali metal, nitrogen containing organic cation, a source of silica, and water, and having the following composition in terms of the mole ratios:______________________________________ M.sup.+ /SiO.sub.2 = 0.01-1.00 OH.sup.- /SiO.sub.2 = 0.15-0.80 H.sub.2 O/SiO.sub.2 = 20-120 Q/SiO.sub.2 = 0.10-1.00 SiO.sub.2 /Y.sub.2 O.sub.3 = Greater Than 8 ______________________________________ wherein M.sup.+ is an alkali metal not supplied by the source zeolite, Q is an organic template, and Y is a mixture of aluminum from the source zeolite, wherein said source zeolite contains soda lite substructures having tetrahedra atom densities of less than about 15 TO.sub.2 per 1000 .ANG..sup.3 ; maintaining the reaction mixture at crystallization temperature until crystals are formed; and recovering the crystals.

    摘要翻译： 公开并要求保护合成大孔沸石的改进方法。 该方法包括制备含有碱金属源氮沸石，含氮有机阳离子，二氧化硅源和水的反应混合物，按摩尔比计算以下组成：-M + / SiO 2 = 0.01-1.00 -OH - / SiO2 = 0.15-0.80 -H2O / SiO2 = 20-120 -Q / SiO2 = 0.10-1.00 -SiO2 / Y2O3 =大于8 - 其中M +是不由源沸石供应的碱金属，Q是有机 模板，Y是来自沸石的铝的混合物，其中所述源沸石含有具有小于约15 TO2 / 1000 ANGSTROM 3的四面体原子密度的苏打液晶结构; 将反应混合物保持在结晶温度直到形成晶体; 并回收晶体。

    High density leucite based ceramics from zeolite
    7.
    发明授权
    High density leucite based ceramics from zeolite 失效
    来自沸石的高密度白云母基陶瓷

    公开(公告)号：US5071801A

    公开(公告)日：1991-12-10

    申请号：US557347

    申请日：1990-07-25

    申请人： Robert L. Bedard ,  Edith M. Flanigen

    发明人： Robert L. Bedard ,  Edith M. Flanigen

    IPC分类号： B01J20/02 ,  B01J29/04 ,  C01B25/45 ,  C01B37/00 ,  C01B39/06 ,  C01B39/46 ,  C01B39/52 ,  C01B39/54 ,  C04B35/19 ,  C07B61/00 ,  C10G45/12 ,  C10G47/16 ,  C10G47/20 ,  C10G49/08

    CPC分类号： C04B35/19

    摘要： This invention relates to processes for preparing ceramic articles. One process involves taking a potassium exchanged zeolite, the zeolite characterized in that it has a SiO.sub.2 /Al.sub.2 O.sub.3 ratio of 3.5 to about 7.5, and calcining it at a temperature of about 900.degree. to about 1100.degree. C. for a time sufficient to collapse the zeolite framework and provide an amorphous powder. Next, the amorphous powder is formed into a shaped article and the article is sintered at a temperature of about 1150.degree. to about 1400.degree. C. for a time of about 0.5 to about 12 hours to give a ceramic article whose principal crystalline phase is tetragonal leucite, is substantially crack free, and has less than 5% porosity. When the zeolite is exchanged with cesium, one obtains a ceramic article whose principal crystalline phase is pollucite, when a rubidium exchanged zeolite is used one obtains a ceramic article whose principal crystalline phase is rubidium leucite, and when a potassium/cesium exchanged zeolite is used one obtains a ceramic article having as its principal crystalline phase a leucite/pollucite solid solution. The addition of pollucite to the leucite article provides a ceramic article whose thermal expansion coefficient can be varied from about 2.times.10.sup.-6 to about 27.times.10.sup.-60 C.sup.-1 as measured over the range 50.degree.-700.degree. C. This invention also relates to this leucite/pollucite ceramic article.

    摘要翻译： 本发明涉及制备陶瓷制品的方法。 一个方法涉及获得钾交换的沸石，该沸石的特征在于其SiO 2 / Al 2 O 3比为3.5至约7.5，并在约900℃至约1100℃的温度下煅烧足够的时间， 沸石骨架，并提供无定形粉末。 接下来，将无定形粉末形成为成型制品，并将制品在约1150℃至约1400℃的温度下烧结约0.5至约12小时，得到其主晶相为四方晶的陶瓷制品 白云母基本上无裂纹，孔隙率小于5％。 当沸石与铯交换时，得到主要结晶相为铯原子的陶瓷制品，当使用铷交换的沸石时，得到主要结晶相为铷白云母的陶瓷制品，并且当使用钾/铯交换的沸石时 得到具有白云母/琉璃灰固体溶液的陶瓷制品的主要结晶相。 将白矾石添加到白云石制品中提供了陶瓷制品，其热膨胀系数可以在50-700℃下测量的约2×10-6至约27×10-60℃-1变化。本发明还涉及这种白云母 /琉璃陶瓷制品。