METHOD FOR PLATINUM GROUP METALS RECOVERY FROM SPENT CATALYSTS

    公开(公告)号:US20170145542A1

    公开(公告)日:2017-05-25

    申请号:US15318459

    申请日:2015-06-18

    CPC classification number: C22B11/06 B01J19/08 C01G55/005 C22B11/048 Y02P10/214

    Abstract: A method for recovery of platinum group metals from a spent catalyst is described. The method includes crushing the spent catalyst to obtain a catalyst particulate material including particles having a predetermined grain size. The method includes subjecting the catalyst particulate material to a chlorinating treatment in the reaction zone at a predetermined temperature for a predetermined time period by putting the catalyst particulate material in contact with the chlorine containing gas. The method also includes applying an electromagnetic field to the chlorine-containing gas in the reaction zone to provide ionization of chlorine; thereby to cause a chemical reaction between platinum group metals and chlorine ions and provide a volatile platinum group metal-containing chloride product in the reaction zone. Following this, the volatile platinum group metal-containing chloride product is cooled to convert the product into solid phase platinum group metal-containing materials.

    Colloidal semiconducting structure
    339.
    发明授权
    Colloidal semiconducting structure 有权
    胶体半导体结构

    公开(公告)号:US09577125B2

    公开(公告)日:2017-02-21

    申请号:US14258696

    申请日:2014-04-22

    Abstract: The present invention is based on a unique design of a novel structure, which incorporates two quantum dots of a different bandgap separated by a tunneling barrier. Upconversion is expected to occur by the sequential absorption of two photons. In broad terms, the first photon excites an electron-hole pair via intraband absorption in the lower bandgap dot, leaving a confined hole and a relatively delocalized electron. The second absorbed photon can lead, either directly or indirectly, to further excitation of the hole, enabling it to then cross the barrier layer. This, in turn, is followed by radiative recombination with the delocalized electron.

    Abstract translation: 本发明基于新颖结构的独特设计,其结合了由隧道屏障分隔的不同带隙的两个量子点。 上转换预期通过顺序吸收两个光子而发生。 在广义上,第一个光子通过下带隙点中的内部吸收激发电子 - 空穴对,留下受限的孔和相对离域的电子。 第二个吸收的光子可以直接或间接导致孔的进一步激发,使其能够穿过阻挡层。 这又是随着与离域电子的辐射复合。

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