Process of preparing alkali peroxide solutions
    2.
    发明授权
    Process of preparing alkali peroxide solutions 失效
    碱性过氧化物溶液的制备方法

    公开(公告)号:US5702585A

    公开(公告)日:1997-12-30

    申请号:US535129

    申请日:1995-11-16

    摘要: The process of making an aqueous alkaline solution containing alkali hydroxide and hydrogen peroxide and having an alkali hydroxide/H.sub.2 O.sub.2 molar ratio of 0.5 to 2.5 includes providing an electrochemical cell having a porous oxygen diffusion cathode, an anode and a cation exchange membrane separating an anode chamber containing the anode and a cathode chamber containing the cathode, providing a decomposition tank outside the electrochemical cell for receiving an aqueous starting solution containing at least one alkali sulfate, alkali hydrogen sulfate, alkali sulfite, alkali hydrogen sulfite, alkali carbonate and/or alkali hydrogen carbonate; feeding an alkali hydrogen sulfate-containing feed solution from the decomposition tank into the anode chamber, feeding an oxygen-containing gas to the cathode and feeding an alkali hydroxide-containing electrolyte into the cathode chamber; passing an electric current between the anode and the cathode to form alkali hydroxide and hydrogen peroxide at the cathode by cathodic reduction and to form sulfuric acid at the anode, withdrawing a sulfuric acid-containing solution from the anode chamber and feeding at least part of it into the decomposition tank together with the starting solution and withdrawing a product solution containing the alkali hydroxide and the hydrogen peroxide from the cathode chamber.

    摘要翻译: PCT No.PCT / EP94 / 01028 Sec。 371日期:1995年11月16日 102(e)日期1995年11月16日PCT 1994年4月1日PCT PCT。 出版物WO94 / 24336 日期:1994年10月27日制备含有碱金属氢氧化物和过氧化氢并且碱金属氢氧化物/ H 2 O 2摩尔比为0.5至2.5的碱性水溶液的方法包括提供具有多孔氧扩散阴极,阳极和阳离子交换的电化学电池 膜分离包含阳极的阳极室和含有阴极的阴极室,在电化学电池外部提供分解罐,用于接收含有至少一种碱金属硫酸盐,碱金属硫酸氢盐,碱金属亚硫酸盐,碱金属亚硫酸盐,碱金属碳酸盐 和/或碱金属氢氧化物; 将来自分解槽的含碱式硫酸氢盐的进料溶液进料到阳极室中,向阴极供给含氧气体,并将含碱金属氢氧化物的电解质进料到阴极室中; 在阳极和阴极之间通过电流,通过阴极还原在阴极上形成碱金属氢氧化物和过氧化氢,并在阳极形成硫酸,从阳极室中取出含硫酸的溶液,并将其至少部分供给 与起始溶液一起进入分解罐,并从阴极室中取出含有碱金属氢氧化物和过氧化氢的产物溶液。

    Gas-diffussion electrodes for polymeric membrane fuel cell
    4.
    发明授权
    Gas-diffussion electrodes for polymeric membrane fuel cell 失效
    用于聚合物膜燃料电池的气体扩散电极

    公开(公告)号:US6017650A

    公开(公告)日:2000-01-25

    申请号:US056298

    申请日:1998-04-07

    摘要: The present invention describes an improved electrode suitable for application in solid polymer electrolyte fuel cells, comprising a thin, porous, planar, conductive substrate having one side coated with a pre-layer consisting of conductive carbon having a low surface area mixed to a first hydrophobic agent, to which is applied a catalytic layer consisting of platinum supported on conductive carbon with a high surface area, mixed to a second hydrophobic agent. The hydrophobic degree of the applied layers are suitably adjusted to obtain the best exploitation of the catalyst and to improve the water balance of the process.

    摘要翻译: 本发明描述了一种适用于固体聚合物电解质燃料电池的改进的电极,其包括薄的,多孔的,平面的导电基底,其具有涂覆有由表面积低的导电碳组成的预先层与第一疏水性 试剂,将由负载在具有高表面积的导电性碳上的铂构成的催化剂层与第二疏水剂混合。 适当地调节施加层的疏水度以获得催化剂的最佳利用并改善该方法的水平衡。