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Molybdaendioxid

Molybdenum(IV) oxide Struktur
18868-43-4
CAS-Nr.
18868-43-4
Bezeichnung:
Molybdaendioxid
Englisch Name:
Molybdenum(IV) oxide
Synonyma:
MOLYBDENUM OXIDE;MoO2;MOLYBDENUM DIOXIDE;Molybdenum(IV) oxide, 99.95%;ioxomolybdenum;Molybdaendioxid;dioxomolybdenum;diketomolybdenum;MOLYBDENUM (IV) OXID;MOLYBDENUM (IV) OXIDE
CBNumber:
CB3140754
Summenformel:
MoO2
Molgewicht:
127.94
MOL-Datei:
18868-43-4.mol

Molybdaendioxid Eigenschaften

Schmelzpunkt:
decomposes [JAN85]
Dichte
6.47 g/mL at 25 °C (lit.)
L?slichkeit
insoluble in H2O, acid solutions, alkaline solutions
Aggregatzustand
Powder
Wichte
6.47
Farbe
Red-brown
Wasserl?slichkeit
slightly soluble H2SO4; insoluble HCl, HF, and alkalies [HAW93]
Crystal Structure
MoO2 type
crystal system
Monoclinic
Space group
P21/c
Lattice constant
a/nmb/nmc/nmα/oβ/oγ/oV/nm3
0.553880.485620.5628590119.683900.1315
Expositionsgrenzwerte
ACGIH: TWA 10 mg/m3; TWA 3 mg/m3
NIOSH: IDLH 5000 mg/m3
InChIKey
QXYJCZRRLLQGCR-UHFFFAOYSA-N
CAS Datenbank
18868-43-4(CAS DataBase Reference)
EPA chemische Informationen
Molybdenum oxide (MoO2) (18868-43-4)
Sicherheit
  • Risiko- und Sicherheitserkl?rung
  • Gefahreninformationscode (GHS)
Kennzeichnung gef?hrlicher Xn
R-S?tze: 20/21/22-36/37/38
S-S?tze: 26-36
WGK Germany  1
RTECS-Nr. QA4688000
TSCA  Yes
HS Code  28257000
Toxizit?t mouse,LD50,subcutaneous,318mg/kg (318mg/kg),Zhurnal Vsesoyuznogo Khimicheskogo Obshchestva im. D.I. Mendeleeva. Journal of the D.I. Mendeleeva All-Union Chemical Society. Vol. 19, Pg. 186, 1974.
Bildanzeige (GHS) GHS hazard pictograms
Alarmwort Warnung
Gefahrenhinweise
Code Gefahrenhinweise Gefahrenklasse Abteilung Alarmwort Symbol P-Code
H315 Verursacht Hautreizungen. Hautreizung Kategorie 2 Warnung GHS hazard pictogramssrc="/GHS07.jpg" width="20" height="20" /> P264, P280, P302+P352, P321,P332+P313, P362
H319 Verursacht schwere Augenreizung. Schwere Augenreizung Kategorie 2 Warnung GHS hazard pictogramssrc="/GHS07.jpg" width="20" height="20" /> P264, P280, P305+P351+P338,P337+P313P
Sicherheit
P264 Nach Gebrauch gründlich waschen.
P264 Nach Gebrauch gründlich waschen.
P280 Schutzhandschuhe/Schutzkleidung/Augenschutz tragen.
P302+P352 BEI BERüHRUNG MIT DER HAUT: Mit viel Wasser/... (Hersteller kann, falls zweckm??ig, ein Reinigungsmittel angeben oder, wenn Wasser eindeutig ungeeignet ist, ein alternatives Mittel empfehlen) waschen.
P305+P351+P338 BEI KONTAKT MIT DEN AUGEN: Einige Minuten lang behutsam mit Wasser spülen. Eventuell vorhandene Kontaktlinsen nach M?glichkeit entfernen. Weiter spülen.
P332+P313 Bei Hautreizung: ?rztlichen Rat einholen/?rztliche Hilfe hinzuziehen.
P337+P313 Bei anhaltender Augenreizung: ?rztlichen Rat einholen/?rztliche Hilfe hinzuziehen.

Molybdaendioxid Chemische Eigenschaften,Einsatz,Produktion Methoden

R-S?tze Betriebsanweisung:

R20/21/22:Gesundheitssch?dlich beim Einatmen,Verschlucken und Berührung mit der Haut.
R36/37/38:Reizt die Augen, die Atmungsorgane und die Haut.

S-S?tze Betriebsanweisung:

S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
S36:DE: Bei der Arbeit geeignete Schutzkleidung tragen.

Chemische Eigenschaften

Lead-gray, nonvolatile powder. Dapproximately 6.4. Insoluble in hydrochloric acidand hydrogen fluoride and alkalies, sparingly solu-ble in sulfuric acid.

Physikalische Eigenschaften

Molybdenum(IV) oxide can be prepared by several methods including controlled oxidation of Mo and controlled reduction of MoO3 with hydrogen. The pure oxide suitable for structure determination has been prepared by electrolysis of a polymolybdate (K2O5.MoO3) solution. Molybdenum(IV) oxide is insoluble in water: it is inert in solutions of nonoxidizing acids or bases, but is dissolved by oxidizing solutions. It dissociates to Mo and MoO3 at high temperatures (~ 1100°).
Crystalline MoO2 is violet or brown. Its deformed rutile structure consists of infinite chains of MoO6 octahedra sharing opposite edges along the chain direction with Mo-Mo distances alternately long (3.10 A) and short (2.50 A). It is diamagnetic and semiconducting ; metal-metal bonds are present. Some of its thermodynamic properties are as follows: G°f29% ~ 172.415 kcal/mole H°f29% -140.5 kcal/mole S°298 11.954 gibbs/mole.

Verwenden

Molybdenum(IV) oxide (MoO2) is a transition metal oxide with good electrical conductivity due to the presence of delocalized electrons in its valence band. It is traditionally prepared by reducing MoO3 in dry hydrogen in the temperature range of 450-550°C.
MoO2 can be used in a variety of energy based applications such as an anode material in rechargeable lithium batteries and fuel flexible solid oxide fuel cells.It can also be used as a catalyst in hydrogen reforming processes.

synthetische

Molybdenum(IV) oxide is obtained by passing steam over red hot molybdenum:
Mo + 2H2O → MoO2 + 2H2
Alternatively, the oxide may be prepared by heating a molybdate salt, such as ammonium molybdate, with a reducing agent such as zinc. The dioxide also may be obtained along with other oxides of molybdenum when molybdenum metal is heated in air.
A brown-black suspension of MoO2 in hydrate form may be obtained by reducing a solution of ammonium molybdate with hydrogen in the presence of colloidal palladium.

Allgemeine Beschreibung

Molybdenum(IV) oxide (MoO2) is a transition metal oxide with good electrical conductivity due to the presence of delocalized electrons in its valence band. It is traditionally prepared by reducing MoO3 in dry hydrogen in the temperature range of 450-550°C.

Hazard

Toxic material.

Sicherheitsprofil

Poison by subcutaneous route. Incandescent reaction with air. When heated to decomposition it emits toxic fumes of Mo.

Molybdaendioxid Upstream-Materialien And Downstream Produkte

Upstream-Materialien

Downstream Produkte


Molybdaendioxid Anbieter Lieferant Produzent Hersteller Vertrieb H?ndler.

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18868-43-4(Molybdaendioxid)Verwandte Suche:


  • Molybdenum(IV)oxide(metalsbasis)
  • MOLYBDENUM(IV) OXIDE (MOO2)
  • Molybdenum(IV)oxide,99%
  • Molybdaendioxid
  • Molybdenum(IV) oxide, 99% (metals basis)
  • Molybdenum(IV)dioxide
  • diketomolybdenum
  • dioxomolybdenum
  • MOLYBDENUM (IV) OXID
  • Molybdenum(IV) oxide, 99% trace metals basis
  • MOLYBDENUM (IV) OXIDE
  • MOLYBDENUM OXIDE BROWN
  • Molybdenum oxide (MoO2)
  • molybdenumoxide(moo2)
  • Nano Molybdenum Dioxide
  • MOLYBDENUM (IV) OXIDEMOLYBDENUM (IV) OXIDEMOLYBDENUM (IV) OXIDE
  • nm 99 dioxomolybdenum
  • Molybdenum(IV) oxide, 99.95%
  • MOLYBDENUM DIOXIDE
  • MOLYBDENUM OXIDE
  • MoO2
  • ioxomolybdenum
  • 18868-43-4
  • Inorganics
  • metal oxide
  • Metal and Ceramic Science
  • Molybdenum
  • Oxides
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