EP0185866B1 - Process for the preparation of silver (iii) oxide - Google Patents
Process for the preparation of silver (iii) oxide Download PDFInfo
- Publication number
- EP0185866B1 EP0185866B1 EP85112886A EP85112886A EP0185866B1 EP 0185866 B1 EP0185866 B1 EP 0185866B1 EP 85112886 A EP85112886 A EP 85112886A EP 85112886 A EP85112886 A EP 85112886A EP 0185866 B1 EP0185866 B1 EP 0185866B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- silver
- iii
- oxide
- anodic oxidation
- production
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- SBGJVZHTWCTWBJ-UHFFFAOYSA-N [Ag+]=O Chemical compound [Ag+]=O SBGJVZHTWCTWBJ-UHFFFAOYSA-N 0.000 title claims description 14
- 238000000034 method Methods 0.000 title claims description 11
- 230000003647 oxidation Effects 0.000 claims description 11
- 238000007254 oxidation reaction Methods 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 239000007864 aqueous solution Substances 0.000 claims description 4
- 229910002651 NO3 Inorganic materials 0.000 claims description 3
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 3
- 150000001450 anions Chemical class 0.000 claims description 3
- 229910017744 AgPF6 Inorganic materials 0.000 claims 1
- 229910001494 silver tetrafluoroborate Inorganic materials 0.000 claims 1
- 229910021653 sulphate ion Inorganic materials 0.000 claims 1
- 150000003378 silver Chemical class 0.000 description 7
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 6
- 239000000243 solution Substances 0.000 description 5
- 125000004430 oxygen atom Chemical group O* 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical group [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- -1 tetrafluoroborate Chemical compound 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- HTQOEHYNHFXMJJ-UHFFFAOYSA-N oxosilver zinc Chemical compound [Zn].[Ag]=O HTQOEHYNHFXMJJ-UHFFFAOYSA-N 0.000 description 1
- VLTRZXGMWDSKGL-UHFFFAOYSA-M perchlorate Inorganic materials [O-]Cl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-M 0.000 description 1
- VLTRZXGMWDSKGL-UHFFFAOYSA-N perchloric acid Chemical compound OCl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-N 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 238000012982 x-ray structure analysis Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
- Battery Electrode And Active Subsutance (AREA)
Description
Die Erfindung betrifft ein Verfahren zur Herstellung von Silber(III)-oxid durch anodische Oxidation von Silbersalzen in wässrigen Lösungen mit Stromdichten von 40 bis 2000 A/m2.The invention relates to a method for producing silver (III) oxide by anodic oxidation of silver salts in aqueous solutions with current densities of 40 to 2000 A / m 2 .
In der «Zeitschriftfür anorganische und allgemeine Chemie, Band 322 (1963), Seite 286 bis 296» werden Verfahren zur Herstellung von Silber(III)-oxid- phasen durch anodische Oxidation von Silbersalzen in wässriger Lösung beschrieben. Dabei wurden verdünnte AgN03-, AgF- und AgCI04-Lösungen bei pH-Werten zwischen 3 und 4 und Raumtemperatur mit Stromdichten zwischen 40 und 100 A/m2 anodisch oxidiert. Man erhielt hierbei eine kubisch flächenzentrierte Oxidphase der «idealen Zusammensetzung» Ag203, die aber nur in Gegenwart von Fremdionen stabil ist und in der Ag3+- und Ag+-ionen in verschiedenen Proportionen vorliegen. Wahrscheinlich handelt es sich hierbei um Chlathrate, wie sie in «Gmelin Handbuch, System-Nr. 61, Teil B1, 1971, Seite 120-121» angeführt werden. In reiner Form wurde Silber(III)-oxid bisher nicht hergestellt.The «Zeitschrift für inorganic und Allgemeine Chemie, Volume 322 (1963), pages 286 to 296» describes processes for the production of silver (III) oxide phases by anodic oxidation of silver salts in aqueous solution. Diluted AgN0 3 , AgF and AgCI0 4 solutions were anodized at pH values between 3 and 4 and room temperature with current densities between 40 and 100 A / m 2 . This gave a face-centered cubic oxide phase of the “ideal composition” Ag 2 0 3 , which is stable only in the presence of foreign ions and in which Ag 3 + and Ag + ions are present in different proportions. It is likely that these are chlathrates as described in «Gmelin Handbuch, System-Nr. 61, part B1, 1971, page 120-121 ». So far, silver (III) oxide has not been produced in pure form.
Es war daher Aufgabe der vorliegenden Erfindung, ein Verfahren zur Herstellung von Silber(III)-oxid durch anodische Oxidation von Silbersalzen in wässrigen Lösungen mit Stromdichten von 40 bis 2000 A/m2 zu finden, mit dem sich reines Silber(III)-oxid gewinnen lässt.It was therefore an object of the present invention to find a process for the preparation of silver (III) oxide by anodic oxidation of silver salts in aqueous solutions with current densities of 40 to 2000 A / m 2 , with which pure silver (III) oxide can be found lets win.
Diese Aufgabe wurde erfindungsgemäss dadurch gelöst, dass als Silbersalze solche mit komplexen Anionen, ausser Nitrat und Sulfat, verwendet werden und die anodische Oxidation bei Temperaturen von -15 bis + 10°C durchgeführt wird. Insbesondere erfolgt die anodische Oxidation bei pH-Werten zwischen 4,5 und 7,5.This object was achieved according to the invention in that those with complex anions other than nitrate and sulfate are used as silver salts and the anodic oxidation is carried out at temperatures from -15 to + 10 ° C. In particular, the anodic oxidation takes place at pH values between 4.5 and 7.5.
Vorzugsweise soll die Arbeitstemperatur zwischen -12 und 0°C und der pH-Wert zwischen 5,5 und 6,5 liegen. Das erfindungsgemässe Verfahren ist durchführbar bei Silbersalzen mit komplexen Amionen, ausser Nitrat und Sulfat. Vorteilhafterweise verwendet man Silbersalze mit Perchlorat, Tetrafluoroborat oder Hexafluorophosphat als Anion. Als günstig hat es sich ausserdem erwiesen, wenn die Silbersalze in hoher Konzentration vorliegen, möglichst in der Nähe des Sättigungspunktes.The working temperature should preferably be between -12 and 0 ° C and the pH between 5.5 and 6.5. The process according to the invention can be carried out on silver salts with complex amions, except nitrate and sulfate. Silver salts with perchlorate, tetrafluoroborate or hexafluorophosphate are advantageously used as the anion. It has also proven to be advantageous if the silver salts are present in high concentration, if possible in the vicinity of the saturation point.
Bei der Elektrolyse einer wässrigen AgCl04-Lösung in einer Platinschale (als Kathode) mit einem z.B. 0,3 mm starken Platindraht als Anode erhält man bei pH = 6, 0°C und einer Stromdichte von 80 A/m2 metallisch glänzende, schwarze Kristalle, die sich analytisch und röntgenographisch als reines Ag203 identifizieren lassen. Nach der Röntgenstrukturanalyse sind die Silberatome näherungsweise quadratisch-planar von Sauerstoffatomen koordiniert, wobei die Silberatome um 0,09 Â aus der durch die vier benachbarten Sauerstoffatome definierten Ebene herausragen. Die Ag04-Baugruppen werden über gemeinsame Sauerstoffatome zu einer Raumnetzstruktur verknüpft. Der mittlere Ag-O-Abstand liegt bei 2,02 Ä.The electrolysis of an aqueous AgCl0 4 solution in a platinum shell (as cathode) with, for example, 0.3 mm thick platinum wire as the anode gives a shiny black, pH = 6.0 ° C and a current density of 80 A / m 2 Crystals that can be identified analytically and by X-ray analysis as pure Ag 2 0 3 . According to the X-ray structure analysis, the silver atoms are coordinated approximately square-planar by oxygen atoms, the silver atoms protruding by 0.09 Â from the plane defined by the four neighboring oxygen atoms. The Ag0 4 assemblies are linked to a spatial network structure via common oxygen atoms. The average Ag-O distance is 2.02 Å.
Das so hergestellte Silber(III)-oxid lässt sich beispielsweise als Oxidationsmittel, als wirksamer Bestandteil der positiven Elektroden in Zink-Silberoxid-Primärzellen oder als Vorstufe für die AgO-Gewinnung verwenden.The silver (III) oxide produced in this way can be used, for example, as an oxidizing agent, as an effective component of the positive electrodes in zinc-silver oxide primary cells or as a precursor for AgO production.
Folgende Beispiele sollendas erfindungsgemässe Verfahren näher erläutern:The following examples are intended to explain the process according to the invention in more detail:
1. Eine 5molare AgCl04-Lösung (ca. 50 Gew.-%) wird bei pH = 4,5 und einer Temperatur von -10°C mit einer Stromdichte von 1063 A/m2 anodisch oxidiert. Als Anode dient ein Platindraht von 0,3 mm Durchmesser und 500 mm Länge, als Kathode ein Platintiegel mit 50 mm Durchmesser. Die Oxidation erfolgt mit einer elektrischen Spannung von 10 Volt und einer Stromstärke von 50 mA.1. A 5 molar AgCl0 4 solution (approx. 50% by weight) is anodized at pH = 4.5 and a temperature of -10 ° C with a current density of 1063 A / m 2 . A platinum wire with a diameter of 0.3 mm and a length of 500 mm serves as the anode, and a platinum crucible with a diameter of 50 mm serves as the cathode. The oxidation takes place with an electrical voltage of 10 volts and a current of 50 mA.
2. Eine 1 molare AgBF4-Lösung wird bei pH = 6 und einer Temperatur von -3°C mit einer Stromdichte von213 A/m2 in der gleichen Vorrichtung wie Beispiel 1 anodisch oxidiert (U = 10 Volt, 1 = 10 mA).2. A 1 molar AgBF 4 solution is anodized at pH = 6 and a temperature of -3 ° C with a current density of 213 A / m 2 in the same device as example 1 (U = 10 volts, 1 = 10 mA) .
3. Eine 0,01molare AgPFs-Lösung wird bei 0°C und pH = 7 mit einer Stromdichte von 106 A/m2 oxidiert (U = 10 Volt, I = 5 mA).3. A 0.01 molar AgPF s solution is oxidized at 0 ° C. and pH = 7 with a current density of 106 A / m 2 (U = 10 volts, I = 5 mA).
In allen drei Fällen erhält man metalisch glänzende, scharze Kristalle, die sich als reines Silber(III)-oxid identifizieren lassen.In all three cases, shiny, black crystals are obtained that can be identified as pure silver (III) oxide.
Claims (6)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3442719 | 1984-11-23 | ||
| DE3442719A DE3442719C1 (en) | 1984-11-23 | 1984-11-23 | Process for the production of silver (III) oxide |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0185866A1 EP0185866A1 (en) | 1986-07-02 |
| EP0185866B1 true EP0185866B1 (en) | 1988-06-01 |
Family
ID=6250960
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP85112886A Expired EP0185866B1 (en) | 1984-11-23 | 1985-10-11 | Process for the preparation of silver (iii) oxide |
Country Status (4)
| Country | Link |
|---|---|
| US (2) | US4695353A (en) |
| EP (1) | EP0185866B1 (en) |
| JP (1) | JPS61127881A (en) |
| DE (2) | DE3442719C1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5336499A (en) * | 1992-01-10 | 1994-08-09 | Antelman Technologies, Ltd. | Molecular crystal device for pharmaceuticals |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1687056A (en) * | 1922-11-24 | 1928-10-09 | Carl Rudolf | Process of electrolytically separating the alloys of silver with other precious or base metals |
| US3048469A (en) * | 1958-12-22 | 1962-08-07 | Yardney International Corp | Method of manufacturing soluble silver salts |
| US3003935A (en) * | 1958-09-08 | 1961-10-10 | Yardney International Corp | Argentous oxide, powder and method for making same |
| US4067788A (en) * | 1976-09-20 | 1978-01-10 | Electromedia, Inc. | Electrochemical production of finely divided metal oxides, metal hydroxides and metals |
| US4298506A (en) * | 1978-11-03 | 1981-11-03 | Duracell International Inc. | Method of treating silver oxide powder and the product formed therefrom |
-
1984
- 1984-11-23 DE DE3442719A patent/DE3442719C1/en not_active Expired
-
1985
- 1985-10-11 DE DE8585112886T patent/DE3563073D1/en not_active Expired
- 1985-10-11 EP EP85112886A patent/EP0185866B1/en not_active Expired
- 1985-11-13 US US06/797,527 patent/US4695353A/en not_active Expired - Fee Related
- 1985-11-20 JP JP60258832A patent/JPS61127881A/en active Pending
-
1987
- 1987-04-14 US US07/037,970 patent/US4717562A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE3442719C1 (en) | 1985-12-12 |
| US4695353A (en) | 1987-09-22 |
| JPS61127881A (en) | 1986-06-16 |
| EP0185866A1 (en) | 1986-07-02 |
| DE3563073D1 (en) | 1988-07-07 |
| US4717562A (en) | 1988-01-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE2713780C2 (en) | Electrochemical power generating cell with positive bromine electrode | |
| DE2636447C2 (en) | Manganese dioxide electrodes | |
| DE2940186C2 (en) | Process for the production of nitrites | |
| DE69819675T2 (en) | Hydrogen production from water using a photocatalysis-electrolysis hybrid system | |
| DE2806441B2 (en) | Apparatus and method for the production of sodium hypochlorite in an electrolytic cell | |
| DE2010169C2 (en) | Electrochemical process for introducing trace amounts of a material into the surface layer of a support | |
| DE2842500C2 (en) | ||
| DE2819685C3 (en) | Electrolyte for a galvanic primary cell with at least one negative electrode made of aluminum or an aluminum alloy | |
| DE3330455C2 (en) | ||
| EP0599136A1 (en) | Process for the production of pure nickel hydroxide and its use | |
| EP0185866B1 (en) | Process for the preparation of silver (iii) oxide | |
| DE1592466B1 (en) | METHOD FOR THE ELECTROLYTIC PRODUCTION OF MANGANDIOXYDE | |
| DE2728171C3 (en) | Process for the production of hydrogen and oxygen from water | |
| EP0054606B1 (en) | Process for diminishing the acid content of a nitric-acid solution by means of an electrolytic current, and apparatus therefor | |
| DE2044025A1 (en) | Self-depoling capacitor electrolytic capacitor with such an electrolyte and a method for producing and using such capacitors | |
| DE1567816B1 (en) | PROCESS FOR THE PRODUCTION OF ALKALINE AND EARTH ALKALI METAL CHLORITES | |
| DE2534913B2 (en) | Process for the production of a catalytically active fuel cell electrode, electrode and its use | |
| DE2061922C3 (en) | Lead-sulfuric acid type accumulator | |
| DE3530375C1 (en) | Method for preparing silver (II, III) oxide | |
| EP0268032A2 (en) | Solid-state electrode for determination of sodium ion concentrations in solutions | |
| DE2836353B1 (en) | Process for the extraction of hydrogen and sulfuric acid by electrochemical decomposition of an electrolyte and electrode for carrying out the electrochemical decomposition | |
| DE3036354A1 (en) | ELECTRODE | |
| Preetz et al. | Darstellung und spektroskopische Charakterisierung von Hexachloroosmat (V)/Preparation and Spectroscopical Characterisation of Hexachloroosmate (V) | |
| DE2546677A1 (en) | METHOD OF MANUFACTURING CADMIUM ELECTRODES FOR NICKEL-CADMIUM BATTERIES | |
| EP0911428B1 (en) | Process for producing bismuth compounds |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| 17P | Request for examination filed |
Effective date: 19851011 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): BE DE FR GB IT NL |
|
| 17Q | First examination report despatched |
Effective date: 19870803 |
|
| GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
| AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): BE DE FR GB IT NL |
|
| ITF | It: translation for a ep patent filed |
Owner name: JACOBACCI & PERANI S.P.A. |
|
| GBT | Gb: translation of ep patent filed (gb section 77(6)(a)/1977) | ||
| REF | Corresponds to: |
Ref document number: 3563073 Country of ref document: DE Date of ref document: 19880707 |
|
| ET | Fr: translation filed | ||
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 19881230 Year of fee payment: 4 |
|
| PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
| 26N | No opposition filed | ||
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Effective date: 19891011 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Effective date: 19891031 |
|
| BERE | Be: lapsed |
Owner name: DEGUSSA A.G. Effective date: 19891031 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Effective date: 19900501 |
|
| GBPC | Gb: european patent ceased through non-payment of renewal fee | ||
| NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee | ||
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Effective date: 19900629 |
|
| REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 19900913 Year of fee payment: 6 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Effective date: 19920701 |