Microporous rare earth silicates and method of producing same
    5.
    发明授权
    Microporous rare earth silicates and method of producing same 失效
    微孔稀土硅酸盐及其制备方法

    公开(公告)号:US06379641B1

    公开(公告)日:2002-04-30

    申请号:US09562730

    申请日:2000-05-01

    IPC分类号: C01B3320

    CPC分类号: C01B39/06

    摘要: Crystalline microporous rare earth silicates are provided. These microporous compositions have a three dimensional framework structure of at least silicon tetrahedral oxide units and at least one M oxide unit. M is a rare earth element. Optionally, the microporous compositions may contain as part of the framework an M′ element having a valence of +2, +3, +4 or +5 such as zinc (+2), iron (+3), zirconium (+4) and tantalum (+5). The composition is represented by the empirical formula: An(M1−zM′z)wSi1−yGeyOx where A is a cation such as sodium and “n”, “z”, “w”, “y” and “x” are the mole fractions of the various elements.

    摘要翻译: 提供结晶微孔稀土硅酸盐。 这些微孔组合物具有至少硅四面体氧化物单元和至少一个M氧化物单元的三维骨架结构。 M是稀土元素。 任选地,微孔组合物可以作为骨架的一部分含有价数为+2,+ 3,+ 4或+ 5的M'元素,例如锌(+2),铁(+3),锆(+4) 和钽(+5)。 该组合物由经验式表示:其中A是阳离子如钠,“n”,“z”,“w”,“y”和“x”是各种元素的摩尔分数。

    Process for removing contaminant metal ions from liquid streams using
metallo germanate molecular sieves
    7.
    发明授权
    Process for removing contaminant metal ions from liquid streams using metallo germanate molecular sieves 失效
    使用金属锗酸盐分子筛从液体流中除去污染金属离子的方法

    公开(公告)号:US5667695A

    公开(公告)日:1997-09-16

    申请号:US650566

    申请日:1996-05-20

    CPC分类号: B01D15/00 B01J20/18 C01B39/00

    摘要: This invention relates to a process for removing contaminant metal ions from a liquid stream. The process involves contacting the liquid stream with a crystalline molecular sieve having the pharmacosiderite structure and having germanium and M metals as framework elements. Optionally, titanium and silicon can also be framework elements. The M metals can be any metal which has octahedral coordination and has a valence of +2, +3, +4 or +5. Illustrative of these M metals are niobium, tin, antimony, aluminum, gallium and tantalum. These molecular sieves are particularly effective in removing cesium and strontium ions from aqueous streams.

    摘要翻译: 本发明涉及从液体流中除去污染金属离子的方法。 该方法包括使液体物流与具有药物依赖石结构并具有锗和M金属作为框架元件的结晶分子筛接触。 任选地,钛和硅也可以是框架元件。 M金属可以是具有八面体配位并具有+2,+3,+4或+5价态的任何金属。 这些M金属的例子是铌,锡,锑,铝,镓和钽。 这些分子筛特别有效地从水流中除去铯和锶离子。