DE732234C - Process for the production of catalysts in which the catalytically active substance is finely distributed on aluminum oxide - Google Patents
Process for the production of catalysts in which the catalytically active substance is finely distributed on aluminum oxideInfo
- Publication number
- DE732234C DE732234C DEV36707D DEV0036707D DE732234C DE 732234 C DE732234 C DE 732234C DE V36707 D DEV36707 D DE V36707D DE V0036707 D DEV0036707 D DE V0036707D DE 732234 C DE732234 C DE 732234C
- Authority
- DE
- Germany
- Prior art keywords
- metal
- oxide
- production
- catalysts
- aluminum
- 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
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
- F17C7/02—Discharging liquefied gases
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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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0215—Coating
- B01J37/0225—Coating of metal substrates
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2203/00—Vessel construction, in particular walls or details thereof
- F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
- F17C2203/0634—Materials for walls or layers thereof
- F17C2203/0636—Metals
- F17C2203/0646—Aluminium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2221/00—Handled fluid, in particular type of fluid
- F17C2221/03—Mixtures
- F17C2221/037—Containing pollutant, e.g. H2S, Cl
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
- F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
- F17C2223/0146—Two-phase
- F17C2223/0153—Liquefied gas, e.g. LPG, GPL
Description
Verfahren zur Herstellung von Katalysatoren, bei denen der katalytisch wirkende Stoff auf Aluminiumoxyd fein verteilt ist Bekanntlich sind die sowohl durch Übertragung wie durch Kontakt wirkenden Katalysatoren um so reaktionsfähiger, je feiner die katalytisch wirkende Substanz verteilt ist und je größer ihre Oberfläche ist. Man hat zur Erhöhung der Feinheit der Verteilung und zur VErgrößerung der Oberfläche der Katalysatoren schon vorgeschlagen, sie auf einem Träger aus einem Stoff niederzuschlagen, der selbst an der Reaktion auch nicht durch katalytische Einwirkung teilnimmt. Es ist auch bekannt, die katalytische Masse mit einem Trägerstoff zu untermischen.Process for the production of catalysts in which the catalytically acting substance on aluminum oxide is finely distributed as is known, which are both by Transfer as through contact-acting catalysts the more reactive, ever the more finely the catalytically active substance is distributed and the larger its surface area is. One has to increase the fineness of the distribution and to enlarge the surface of the catalysts already proposed to deposit them on a carrier made of a substance, who himself does not take part in the reaction even through catalytic action. It it is also known to mix the catalytic mass with a carrier.
Es ist nun ein Verfahren bekanntgeworden, nach dem zur weiteren Erhöhung der Fein heit der Verteilung sowie einer weiteren Vergrößerung der Oberfläche, die der Katalysator bei seiner Verwendung mit den Rleaktionsteilnehmern in Berührung bringen kann, auf einem als Trägerstoff dienenden Formling ans Leichtmetall eine künstlich erzeugte Leichtmetalloxydschicht geschaffen wird, die mit dem zum Katalysator bestimmten Metall in Form eine rSEalzlösung getränkt wird, worauf das von der Oxydschicht aufgezogene Metallsalz durch chemische Einwirkung in ds Metall, das Metalloxyd, das Metallsulfid o. dgl. umgewandelt wird. A method has now become known, according to which to further increase the fineness of the distribution as well as a further enlargement of the surface, the the catalyst in use with the reaction participants in contact can bring, on a molding serving as a carrier material to the light metal one Artificially produced light metal oxide layer is created, which is used with the catalyst certain metal in the form of an RS salt solution is soaked, whereupon the oxide layer drawn up metal salt through chemical action in the metal, the metal oxide, the metal sulfide or the like is converted.
Der auf diese Weise über die ganze Leichtmetalloxydschicht verteilte Katalysator weist wegen der Mikrostruktur dieser Schicht eine sehr hohe Feinheit der Verteilung auf, die zu einer unmittelbaren Steigerung der Aktivität des Katalysators führt. That spread over the entire light metal oxide layer in this way Due to the microstructure of this layer, the catalyst has a very high degree of fineness the distribution, which leads to an immediate increase in the activity of the catalyst leads.
In vielen Fällen müssen aber katalytische Reaktionen bei Temperaturen stattfinden, die über dem Schmelzpunkt des Leichtmetalls liegen. Für diese anwendungsfälle sollen nun Katalysatoren verwendet werden, die aerfindungsgem äß derart hergestellt werden, daß man, statt von dickwandigen Leichtmetallformlingen auszugehen, Folien verwendet, die durch ihren ganzen Querschnitt hindurch oxydient sind. Derartige Fohen, z. B. aus Aluminium mit einer Dicke von 15 bis 25 jt, kann man Temperaturen von weit iiber 10000 C aussetzen, ohne daß das Aluminiumoxydskelett zerfällt. In many cases, however, catalytic reactions must take place at temperatures take place that are above the melting point of the light metal. For these use cases Catalysts are now to be used which are produced in this way according to the invention that one, instead of starting from thick-walled light metal moldings, foils used, which are oxidised through their entire cross-section. Such Fohen, e.g. B. made of aluminum with a thickness of 15 to 25 jt, temperatures exposure at temperatures well above 10,000 C without disintegrating the alumina skeleton.
Gelegentlich der herstellung von Hydroxyden dreiwertiger Metalle, wie z. B. des Aluminiums, in Form reversibler Kollodie wurde bereits vorgeschlagen, die daraus gewonnenen irreversiblen Gele als Katalysatoren oder als Träger für solche zu venlenden. Occasionally the production of hydroxides of trivalent metals, such as B. of aluminum, in the form of reversible collody has already been proposed, the irreversible gels obtained therefrom as catalysts or as carriers for such to use.
Während aber diese Gele in Form von locke. ren Massen anfallen, soll erfindungsgemäß z. B. das Aluminiumoxyd infolge der Durchoxydation von dünnen aluminiumblättern in Form eines starren und flächigen Körpers als Katalysatorträger dienen. Diese dünnen starren oxydskelette sind zu dem außerordentlich leicht, so daß beispielsweise bei einer Ausbreitung in flacher Schüttung auf Horden hohe mechanische Beanspruchungen überhaupt nicht auftreten.But while these gels are in the form of curls. larger masses should arise according to the invention z. B. the aluminum oxide as a result of the oxidation of thin aluminum sheets serve as a catalyst carrier in the form of a rigid and flat body. These thin rigid oxide skeletons are extremely light, so that for example high mechanical stresses when spreading in a flat bed on trays does not occur at all.
Auch für die Herstellung von sog. Mischkatalysatoren, die Magnesiumoxyd enthalten, eignet sich die Erfindung. Hierfür verwendet man z. B. eine Al-Legierung mit 9O' 0 Al und 10% Mg. Um nun in der oxydierten Legierung fein verteiltes Magnesium zu erhalten. unterwirft man die Folie vor der Oxydation einer Wärmebehandlung. Diese kann darin bestehen. daß man die Folie bis zur Homogenisierung des Gefüges glüht und dann die Mischkristalle zum Zerfallen bringt, so daß ein heterogenes Gefüge entsteht. Die ein solches Gefüge aufweisende Folie wird künstlich oxydiert; in diese das Mg-Oxyd in feiner Verteilung enthaltende Folie wird dann in bekannter Weise der Katalysator eingelagert. Also for the production of so-called mixed catalysts, the magnesium oxide contain, the invention is suitable. For this one uses z. B. an Al alloy with 90 '0 Al and 10% Mg. Magnesium now finely distributed in the oxidized alloy to obtain. the foil is subjected to a heat treatment prior to oxidation. These can be. that the film is annealed until the structure is homogenized and then brings the mixed crystals to disintegrate, so that a heterogeneous structure arises. The film with such a structure is artificially oxidized; in these the film containing Mg oxide in finely divided form is then applied in a known manner the catalyst is stored.
Der Oxydfilm wird keiner Nachdichtung oder einer anderen zur Schließung der Mikroporen $führenden Nachbehandlung unterworfen. Es hat sich dagegen als vorteilhaft erwiesen, ihn vor der Tränkung mit Metallsalz einer Erhitzung auf 250 bis 325 C auszusetzen, durch die seine Porosität anscheinend erhöht wird. The oxide film will not be used for any re-sealing or any other closure the micropore-leading after-treatment. It has, on the other hand, been found to be beneficial proved to heat it to 250 to 325 C before impregnating it with metal salt which appears to increase its porosity.
Die erfindungsgemäß hergestellten Katalysatoren können z. B. Anwendung finden bei der Darstellung von Wasserstoff aus Kohlenoxyd und Wasserdampf oder bei der Oxvdation von Ammoniak zu Salpetersäure. The catalysts prepared according to the invention can, for. B. Application found in the representation of hydrogen from carbon oxide and water vapor or in the oxidation of ammonia to nitric acid.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEV36707D DE732234C (en) | 1940-05-18 | 1940-05-18 | Process for the production of catalysts in which the catalytically active substance is finely distributed on aluminum oxide |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEV36707D DE732234C (en) | 1940-05-18 | 1940-05-18 | Process for the production of catalysts in which the catalytically active substance is finely distributed on aluminum oxide |
Publications (1)
Publication Number | Publication Date |
---|---|
DE732234C true DE732234C (en) | 1943-02-25 |
Family
ID=7590200
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEV36707D Expired DE732234C (en) | 1940-05-18 | 1940-05-18 | Process for the production of catalysts in which the catalytically active substance is finely distributed on aluminum oxide |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE732234C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE968453C (en) * | 1949-05-24 | 1958-02-20 | Eugene Jules Houdry | Process for the production of a catalyst consisting of a shaped, catalytically inert, impermeable carrier coated with a metal oxide layer |
-
1940
- 1940-05-18 DE DEV36707D patent/DE732234C/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE968453C (en) * | 1949-05-24 | 1958-02-20 | Eugene Jules Houdry | Process for the production of a catalyst consisting of a shaped, catalytically inert, impermeable carrier coated with a metal oxide layer |
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