DE1129291B - Process for the production of a very brittle and easily grindable Raney silver alloy - Google Patents
Process for the production of a very brittle and easily grindable Raney silver alloyInfo
- Publication number
- DE1129291B DE1129291B DER27846A DER0027846A DE1129291B DE 1129291 B DE1129291 B DE 1129291B DE R27846 A DER27846 A DE R27846A DE R0027846 A DER0027846 A DE R0027846A DE 1129291 B DE1129291 B DE 1129291B
- Authority
- DE
- Germany
- Prior art keywords
- silver
- raney
- brittle
- percent
- weight
- 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.)
- Pending
Links
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/90—Selection of catalytic material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J25/00—Catalysts of the Raney type
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C5/00—Alloys based on noble metals
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C5/00—Alloys based on noble metals
- C22C5/06—Alloys based on silver
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Conductive Materials (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
- Catalysts (AREA)
Description
Verfahren zur Herstellung einer sehr spröden und leicht mahlbaren Raney-Silber-Legierung Es ist bekannt, daß sich hochaktive Katalysatoren dadurch herstellen lassen, daß aus einer 2- oder mehrkomponentigen Legierung mindestens eine katalytisch unwirksame Komponente chemisch oder elektrochemisch herausgelöst wird. Ein ausgezeichneter Katalysator für Hydrierungsreaktionen ist z. B. Process for producing a very brittle and easily grindable Raney silver alloy It is known that highly active catalysts are thereby let produce that from a two or more component alloy at least a catalytically inactive component is chemically or electrochemically dissolved out will. An excellent catalyst for hydrogenation reactions is e.g. B.
Raney-Nickel. Weiter sind Raney-Silber, Raney-Kobalt, Raney-Eisen, Raney-Kupfer und Raney-Molybdän als Katalysatoren bekannt.Raney nickel. Next are Raney silver, Raney cobalt, Raney iron, Raney copper and Raney molybdenum are known as catalysts.
Als herauslösbare Komponente für Raney-Legierungen sind besonders Aluminium und Zink geeignet. Die Legierungszusammensetzung mit der katalytisch aktiven Komponente ist dabei in der Weise zu wählen, daß der Raney-Katalysator ein Optimum an katalytischer Aktivität erhält. Andererseits ist es wünschenswert, daß die Raney-Legierung hinreichend spröde ist, so daß man sie ohne großen Aufwand zu feinem Pulver zermahlen kann. Die Sprödigkeit wird aber ebenfalls durch die Zusammensetzung der Raney-Legierung bestimmt. Zwischen beiden Forderungen muß also unter Umständen ein Kompromiß geschlossen werden. As a removable component for Raney alloys are special Suitable for aluminum and zinc. The alloy composition with the catalytically active Component is to be chosen in such a way that the Raney catalyst is an optimum in catalytic activity. On the other hand, it is desirable that the Raney alloy is sufficiently brittle that it can be ground to a fine powder without great effort can. The brittleness is also due to the composition of the Raney alloy certainly. A compromise may therefore have to be struck between the two demands will.
Besonders schwierig ist es, hinreichend spröde Raney-Silber-Legierungen herzustellen, die einen Raney-Silber-Katalysator optimaler Aktivität liefern. It is particularly difficult to obtain sufficiently brittle Raney silver alloys to produce a Raney silver catalyst of optimal activity.
So sind Silber-Aluminium-Legierungen zwar, abgesehen von den silber- bzw. aluminiumreichen Grenzphasen, derart spröde, daß sie sich für spanlose Verformungen nur wenig eignen, sie sind jedoch immer noch so duktil, daß sie sich in Mühlen nur schwer zu feinem Pulver zermahlen lassen. Andererseits kann aus Silber-Aluminium-Legierungen mit einem Gehalt von mehr als 15 Gewichtsprozent Al durch Behandlung mit konzentrierter Kalilauge ein Raney-Silber-Katalysator gewonnen werden, der z. B. die kathodische Reduktion von Sauerstoff ausgezeichnet katalysiert. Als besonders geeignet erweist sich für diesen Zweck eine Raney-Silber-Legierung der Zusammensetzung 65 Gewichtsprozent Ag und 35 Gewichtsprozent Al.So, apart from the silver-aluminum alloys, or aluminum-rich boundary phases, so brittle that they are suitable for non-cutting deformations Not very suitable, but they are still so ductile that they can only be found in mills difficult to grind to a fine powder. On the other hand, silver-aluminum alloys can be used with a content of more than 15 percent by weight Al by treatment with concentrated Potash a Raney silver catalyst can be obtained, the z. B. the cathodic Excellent catalyzed reduction of oxygen. Proves to be particularly suitable For this purpose, a Raney silver alloy with the composition 65 percent by weight Ag and 35 weight percent Al.
Es wurde nun ein Verfahren zur Herstellung einer sehr spröden und leicht mahlbaren Raney-Silber-Legierung, bestehend aus 85 bis 40 Gewichtsprozent Silber und 15 bis 60Gewichtsprozent Aluminium, vorzugsweise aus 65 Gewichtsprozent Silber und 35 Gewichtsprozent Aluminium, die einen Raney-Silber-Katalysator optimaler Aktivität liefert, gefunden. Es besteht darin, daß die Silber-Aluminium-Legierung von einer Temperatur oberhalb 5700 C, bei der eine schmelzflüssige Phase existiert, vorzugsweise von einer Temperatur zwischen 700 und 800" C innerhalb von einigen Sekunden auf weniger als 100" C, vorzugsweise im Wasserbad, abgeschreckt wird. Hierbei kann beispielsweise der Schmelztiegel in ein Wasserbad eingetaucht werden. Eine andere Möglichkeit besteht darin, die schmelzflüssige Silber-Aluminium-Legierung direkt in ein Wasserbad zu gießen. Die nach diesem Verfahren abgeschreckten Aluminium-Silber-Legierungen sind wesentlich spröder als langsam abgekühlte. There has now been a method of making a very brittle and easily grindable Raney silver alloy, consisting of 85 to 40 percent by weight Silver and 15 to 60 percent by weight aluminum, preferably 65 percent by weight Silver and 35 weight percent aluminum, making a Raney silver catalyst more optimal Activity supplies, found. It consists in that the silver-aluminum alloy from a temperature above 5700 C, at which a molten phase exists, preferably from a temperature between 700 and 800 "C within a few Seconds to less is quenched below 100 "C, preferably in a water bath For example, the crucible can be immersed in a water bath. One Another option is the molten silver-aluminum alloy pour directly into a water bath. The aluminum-silver alloys quenched by this process are much more brittle than slowly cooled.
Sie lassen sich leicht in Kugelmühlen zu feinen Pulvern zermahlen. Diese Pulver sind besonders zur Herstellung von Doppelskelett-Katalysator8lektroden nach der deutschen Patentschrift 1 019 361 zur elektrochemischen Reduktion des Sauerstoffes in Brennstoffelementen geeignet. They can be easily ground into fine powders in ball mills. These powders are especially useful for making double skeleton catalyst electrodes according to German patent specification 1 019 361 for the electrochemical reduction of oxygen suitable in fuel elements.
Claims (1)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DER27846A DE1129291B (en) | 1960-04-27 | 1960-04-27 | Process for the production of a very brittle and easily grindable Raney silver alloy |
GB14818/61A GB929089A (en) | 1960-04-27 | 1961-04-24 | Brittle raney silver alloy |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DER27846A DE1129291B (en) | 1960-04-27 | 1960-04-27 | Process for the production of a very brittle and easily grindable Raney silver alloy |
Publications (1)
Publication Number | Publication Date |
---|---|
DE1129291B true DE1129291B (en) | 1962-05-10 |
Family
ID=7402569
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DER27846A Pending DE1129291B (en) | 1960-04-27 | 1960-04-27 | Process for the production of a very brittle and easily grindable Raney silver alloy |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE1129291B (en) |
GB (1) | GB929089A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2431879A1 (en) * | 1978-07-24 | 1980-02-22 | Us Energy | RANEY ALLOY SPONTANEOUSLY DISAGGREES ON CONTACT WITH WATER VAPOR AND ITS PREPARATION |
DE10154638A1 (en) * | 2001-11-07 | 2003-05-22 | Bosch Gmbh Robert | Catalytically active layer used as an electrode for a sensor element of a gas sensor for determining a gas component in a gas mixture comprises a metallic component containing a precious metal and non-noble metal |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5752340B2 (en) * | 1973-05-16 | 1982-11-06 | ||
CN110743572B (en) * | 2019-11-14 | 2023-02-24 | 北京石油化工学院 | Raney silver catalyst and preparation method and application thereof |
-
1960
- 1960-04-27 DE DER27846A patent/DE1129291B/en active Pending
-
1961
- 1961-04-24 GB GB14818/61A patent/GB929089A/en not_active Expired
Non-Patent Citations (1)
Title |
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None * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2431879A1 (en) * | 1978-07-24 | 1980-02-22 | Us Energy | RANEY ALLOY SPONTANEOUSLY DISAGGREES ON CONTACT WITH WATER VAPOR AND ITS PREPARATION |
DE10154638A1 (en) * | 2001-11-07 | 2003-05-22 | Bosch Gmbh Robert | Catalytically active layer used as an electrode for a sensor element of a gas sensor for determining a gas component in a gas mixture comprises a metallic component containing a precious metal and non-noble metal |
DE10154638B4 (en) * | 2001-11-07 | 2006-03-02 | Robert Bosch Gmbh | Catalytically active layer |
US7361620B2 (en) | 2001-11-07 | 2008-04-22 | Robert Bosch Gmbh | Catalytically active layer |
Also Published As
Publication number | Publication date |
---|---|
GB929089A (en) | 1963-06-19 |
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