Method for preparing the oxysulfides of rare earth elements
    4.
    发明授权
    Method for preparing the oxysulfides of rare earth elements 失效
    稀土元素氧硫化物的制备方法

    公开(公告)号:US5795554A

    公开(公告)日:1998-08-18

    申请号:US790600

    申请日:1997-01-29

    摘要: The present invention discloses a method for the catalytic reduction of sulfur dioxide, for example in flue gas, by carbon monoxide using lanthanum oxysulfide as the active catalyst. The catalyst is prepared from lanthanum oxide by hydration and sulfidization, the latter step being carried out in the gas stream itself. This method of preparation has more general applicability and can also be used as a method for the preparation of lanthanum, yttrium, gadolinium and lutetium oxysulfides generally.

    摘要翻译: 本发明公开了一种使用氧硫化镧作为活性催化剂的一氧化碳催化还原二氧化硫的方法,例如在烟道气中。 催化剂由氧化镧通过水合和硫化制备,后一步骤在气流本身中进行。 这种制备方法具有更普遍的适用性,并且也可以用作制备镧,钇,钆和硫酸镥的方法。

    Process for producing phosphors
    5.
    发明授权
    Process for producing phosphors 失效
    生产磷光体的方法

    公开(公告)号:US3637517A

    公开(公告)日:1972-01-25

    申请号:US3637517D

    申请日:1970-01-15

    摘要: A process for producing an ultrapure rare earth oxide phosphor from partially purified raw materials is disclosed that comprises forming an acidic aqueous solution comprising water, a mineral acid, europium and a second rare earth element selected from the group consisting of yttrium, gadolinium and mixtures thereof having a relatively minute amount of an impurity selected from the group consisting of cerium, thorium and mixtures thereof, maintaining the solution under controlled pH and temperature condition, adding to the solution a controlled amount of a watersoluble persulfate source to thereby form a solid and liquid phase, separating the phases and adding oxalic acid to the liquid phase to form a rare earth oxalate and converting the oxalate to the corresponding rare earth phosphor selected from the group consisting of rare earth oxides and rare earth oxysulfides.

    摘要翻译: 公开了一种从部分纯化的原料制造超纯稀土氧化物荧光体的方法,其包括形成包含水,无机酸,铕和选自钇,钆及其混合物的第二稀土元素的酸性水溶液 具有选自铈,钍及其混合物的相对微量的杂质,将溶液保持在受控的pH和温度条件下,向该溶液中加入受控量的水溶性过硫酸盐源,从而形成固体 和液相,分离相并向草酸中加入草酸形成稀土草酸盐,并将草酸酯转化成选自稀土氧化物和稀土氧硫化物的相应的稀土荧光体。

    NANO-SCALE METAL OXYHALIDE AND OXYSULFIDE SCINTILLATION MATERIALS AND METHODS FOR MAKING SAME
    9.
    发明申请
    NANO-SCALE METAL OXYHALIDE AND OXYSULFIDE SCINTILLATION MATERIALS AND METHODS FOR MAKING SAME 审中-公开
    纳米尺度金属氧化物和氧化物闪烁材料及其制备方法

    公开(公告)号:US20110024685A1

    公开(公告)日:2011-02-03

    申请号:US12690980

    申请日:2010-01-21

    IPC分类号: C09K11/84 C09K11/86

    摘要: Crystalline scintillator materials comprising nano-scale particles of metal oxides, metal oxyhalides and metal oxysulfides are provided. The nano-scale particles are less than 100 nm in size. Methods are provided for preparing the particles. In one method, used to form oxyhalides and oxysulfides, metal salts are dissolved in water, and then precipitated out as fine particles using an aqueous base. After the particles are separated from the solution, they are annealed under a flow of a water saturated hydrogen anion gas, such as HCl or H2S, to form the crystalline scintillator particles The other methods take advantage of the characteristics of microemulsion solutions to control droplet size, and, thus, the particle size of the final nano-particles. For example, in one method, a first micro-emulsion containing metal salts if formed. The first micro-emulsion is mixed with an aqueous base in a second micro-emulsion to form the final nano-scale particles.

    摘要翻译: 提供了包含金属氧化物,金属卤氧化物和金属氧硫化物的纳米级颗粒的结晶闪烁体材料。 纳米级颗粒的尺寸小于100nm。 提供了制备颗粒的方法。 在一种用于形成卤氧化物和氧硫化物的方法中,将金属盐溶解在水中,然后使用碱水溶液作为细颗粒沉淀出来。 颗粒从溶液中分离后,在水饱和氢阴离子气体如HCl或H2S的流动下进行退火,形成晶体闪烁体颗粒。其他方法利用微乳液溶液的特性来控制液滴尺寸 ,因此,最终纳米颗粒的粒径。 例如,在一种方法中,如果形成含有金属盐的第一微乳液。 将第一微乳液与第二微乳液中的水性碱混合以形成最终的纳米尺度颗粒。