摘要:
Efficient and cost-effective electrochemical devices and processes for the remediation of aqueous waste streams. The invention provides electrolytic cells having a high surface area spouted electrode for removal of heavy metals and oxidation of organics from aqueous environments. Heavy metal ions are reduced, deposited on cathode particles of a spouted bed cathode and removed from solution. Organics are efficiently oxidized at anode particles of a spouted bed anode and removed from solution. The method of this inventions employs an electrochemical cell having an anolyte compartment and a catholyte compartment, separated by a microporous membrane, in and through which compartments anolyte and catholyte, respectively, are circulated. A spouted-bed electrode is employed as the cathode for metal deposition from contaminated aqueous media introduced as catholyte and as the anode for oxidation of organics from contaminated aqueous media introduced as anolyte.
摘要:
This invention provides alkali ion conducting polymer electrolytes with high ionic conductivity and elastomeric properties suitable for use in high energy batteries. The polymer electrolytes are cyclic carbonate-containing polysiloxanes that can be modified with a cross linker or chain extender, and an alkali metal ion-containing material dissolved in the carbonate-containing polysiloxane. The cyclic carbonate-containing polysiloxanes may be prepared by reacting derivatized polysiloxanes with chain extending and/or crosslinking agents. The invention also provides batteries prepared by contacting an alkali metal anode with an alkali metal intercalating cathode and an alkali ion-conducting polymer electrolyte. As one example, polymers prepared from poly {3[2,3-(carbonyldioxy)propoxy]propyl]methyl siloxane, a polysiloxane with cyclic carbonate side chains, have shown promising results for battery applications. This polymer was crosslinked with methyltriacetoxy silane and incorporates lithium trifluoromethanesulfonate into the polymer matrix as the ion conductor. Polymers were prepared using various solvent systems and temperatures in order to produce a polymer film with the desired properties for this application. Each polymer made from the precursor poly {3[2,3-(carbonyldioxy)propoxy]propyl]methyl siloxane exhibits a glass transition temperature (Tg) in the range of −100° C. to −70° C. and ionic conductivity of 6.5×10−5 at 25° C. and 5.3×10−4 at 60° C. which indicates that this material has distinct possibilities in lithium battery applications. Materials are flexible and readily adhere to the electrode surface. Polymers are synthesized by initially forming alkyl chains which include an ester carbonic acid group. The ester carbonic acid contains the ether oxygen within the single phase polymer matrix which facilitates the ionic dissociation of lithium salts. Ester carbonic acids groups are formed by the transesterification of alkyl diols such as 3-(allyloxy)-1,2-propanediol and 1,2 hexanediol with diethyl carbonate. This reaction produces ester carbonic acids with reactive end groups such as alkyls and alkanes which can then be further reacted to form dihalide end groups. Reactive groups on the ester carbonic acid are then reacted with various polymethyl siloxanes which serve as the polymer backbone for single phase elastomeric polymers which readily dissolve lithium salts.
摘要:
This invention relates to gas-impermeable, solid state materials fabricated into membranes for use in catalytic membrane reactors. This invention particularly relates to solid state oxygen anion- and electron-mediating membranes for use in catalytic membrane reactors for promoting partial or full oxidation of different chemical species, for decomposition of oxygen-containing species, and for separation of oxygen from other gases. Solid state materials for use in the membranes of this invention include mixed metal oxide compounds having the brownmillerite crystal structure.
摘要:
Gas-impermeable membranes containing a molten salt electrolyte in an electron-conducting matrix provide for mixed ion and electron conduction across the membrane. The membranes mediate transport of a selected ion for gas separation and or catalytic reactions at the membrane surface. The membranes are useful in catalytic membrane reactors, particularly for gas separation and full or partial oxidation reactions. The membranes are of particular interest for mediation of oxide ions, such as carbonate, for carbon dioxide separation or for partial oxidation reactions. Catalytic membrane reactors can incorporate catalyst layers on the membrane surfaces and or three-dimension catalysts, e.g., packed-bed catalysts, in the oxidation zone or the reduction zone of the reactor. The invention also relates to methods of gas separation and method for generating products employing the membranes and catalytic membrane reactors of this invention. Membranes and reactors of this invention that incorporate a molten carbonate salt are of particular use in the production of synthesis gas.
摘要:
Mixed electron- and proton-conducting metal oxide materials are provided. These materials are useful in fabrication of membranes for use in catalytic membrane reactions, particularly for promoting dehydrogenation of hydrocarbons, oligomerization of hydrocarbons and for the decomposition of hydrogen-containing gases. Membrane materials are perovskite compounds of the formula: AB1−xB′xO3−y where A=Ca, Sr, or Ba; B=Ce, Tb, Pr or Th; B′=Ti, V, Cr, Mn, Fe, Co, Ni or Cu; 0.2≦x≦0.5, and y is a number sufficient to neutralize the charge in the mixed metal oxide material.
摘要翻译:提供了混合的电子和质子传导金属氧化物材料。 这些材料可用于制造用于催化膜反应的膜,特别是用于促进烃的脱氢,烃的低聚和含氢气体的分解。 膜材料是下式的钙钛矿化合物:其中A = Ca,Sr或Ba; B = Ce,Tb,Pr或Th; B'= Ti,V,Cr,Mn,Fe,Co,Ni或Cu; 0.2 <= x <= 0.5,y是足以中和混合金属氧化物材料中的电荷的数。
摘要:
A solid oxide fuel cell and process for direct conversion of natural gas into DC electricity concurrently with the electrocatalytic partial oxidation of methane to C.sub.2 hydrocarbon species C.sub.2 H.sub.4, C.sub.2 H.sub.6, and minor amounts of C.sub.2 H.sub.2.
摘要:
Apparatus for reducing oxalic acid to a product includes a cell. A separator which separates the cell into two chambers; a catholyte chamber and an anolyte chamber. Each chamber has an inlet and an outlet. A porous cathode having a catalyst is arranged within the catholyte chamber so that a catholyte entering the inlet of the catholyte chamber will pass through the cathode. A porous anode is arranged within the anolyte section so that an electrolyte entering the inlet of the anolyte section will pass through the anode and exit through the outlet of anolyte section. A source provides the catholyte which is a mixture of oxalic acid and an electrolyte to the inlet of the catholyte chamber while another source provides the electrolyte to the inlet of the anolyte chamber. A d.c. voltage is provided between the cathode and the anode so as to cooperate in the reduction of oxalic acid within the porous cathode to a product which exits the catholyte chamber by way of its outlet.
摘要:
This invention relates to lithium-germanium containing electrodes for electrical energy storage batteries, batteries containing such electrodes and a process for fabrication of such electrodes from materials in the charged and uncharged state. The electro-chemically active material may be a binary alloy of lithium-germanium or ternary alloys of lithium-germanium-silicon and lithium-germanium-aluminum. Negative electrodes for electrical storage batteries fabricated according to this invention provide batteries having improved stability over prior art lithium containing electrodes and provides a particularly advantageous negative electrode for use in lithium-metal sulfide batteries having improved stability.
摘要:
A gas diffusion semiconductor electrode and solar cell and a process for gaseous fixation, such as nitrogen photoreduction, CO.sub.2 photoreduction and fuel gas photo-oxidation. The gas diffusion photosensitive electrode has a central electrolyte-porous matrix with an activated semiconductor material on one side adapted to be in contact with an electrolyte and a hydrophobic gas diffusion region on the opposite side adapted to be in contact with a supply of molecular gas.
摘要:
An improved lithium electrode structure comprises an alloy of lithium, silicon, and boron in specified proportions and a supporting current-collecting matrix in intimate contact with said alloy. The lithium electrode of the present invention is utilized as the negative electrode in a rechargeable electrochemical cell.