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Aluminium molybdate

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Aluminium molybdate
Identifiers
CAS Number
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.035.607 Edit this at Wikidata
PubChem CID
CompTox Dashboard (EPA)
InChI
  • InChI=1S/2Al.3Mo.12O/q2*+3;;;;;;;;;;6*-1Key: NKSYNYABFPVRNP-UHFFFAOYSA-N
  • InChI=1/2Al.3Mo.12O/q2*+3;;;;;;;;;;6*-1Key: NKSYNYABFPVRNP-WODKIKDAAY
SMILES
  • ..(=O)(=O).()(=O)=O.()(=O)=O
Properties
Chemical formula Al2(MoO4)3
Molar mass 533.77 g mol
Appearance grey, metallic solid/powder
odorless
Melting point 705 °C (1,301 °F; 978 K)
Solubility in water slightly soluble in water
Structure
Space group P21/a, No. 14
Lattice constant a = 15.3803(9) Å, b = 9.0443(1) Å, c = 17.888(1) Åα = 90°, β = 125.382(3)°, γ = 90°
Hazards
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 1: Exposure would cause irritation but only minor residual injury. E.g. turpentineFlammability (red): no hazard codeInstability (yellow): no hazard codeSpecial hazards (white): no code
1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). ☒N verify (what is  ?) Infobox references
Chemical compound

Aluminium molybdate is the chemical compound Al2(MoO4)3. It forms in certain hydrodesulfurization catalysts when alumina is doped with excess molybdenum. When molybdates are used to inhibit corrosion in aluminum piping, the protective film formed is hydrated aluminum molybdate. Although small quantities of aluminum molybdate form during aluminothermic reduction of molybdia, mechanical activation inhibits their formation.

Large-scale samples can be prepared via sol-gel synthesis, and have been proposed for molybdenum-99 storage in nuclear medicine.

The room temperature crystal structure was refined using time-of-flight powder neutron diffraction data. It is monoclinic and isostructural with Fe2(MoO4)3 and Cr2(MoO4)3. At high temperatures, the crystal rearranges to β‑Al2(MoO4)3, isostructural with scandium tungstate.

Aluminum molybdate has a very low thermal expansion coefficient near room temperature.

References

  1. ^ Harrison, W. T. A.; Cheetham, A. K.; Faber, J. (1988). "The crystal structure of aluminium molybdate". Journal of Solid State Chemistry. 76 (2): 328–333. Bibcode:1988JSSCh..76..328H. doi:10.1016/0022-4596(88)90226-5.
  2. Medema, J.; van Stam, C.; de Beer, V. H. J.; Konings, A. J. A.; Koningsberger, D. C. (2 May 1977). "Raman spectroscopic study of Co–Mo/γ-Al2O3 catalysts" (PDF). Journal of Catalysis. 53 (published 1978): 386–400. doi:10.1016/0021-9517(78)90110-0 – via Eindhoven University of Technology library.
  3. McCune, R. C.; Shilts, R. L.; Ferguson, S. M. (1982-01-01). "A study of film formation on aluminum in aqueous solutions using Rutherford backscattering spectroscopy". Corrosion Science. 22 (11): 1049–1065. doi:10.1016/0010-938X(82)90091-9. ISSN 0010-938X.
  4. Byrne, Christian E.; Quesada Cangahuala, Nereida V.; D'Alessandro, Oriana; Deyá, Cecilia (2023-07-10). "Cerium and aluminum molybdates as inhibitors of the aluminum AA1050 corrosion process in aqueous NaCl solutions". Materials and Corrosion. 75: 73–83. doi:10.1002/maco.202313940. ISSN 0947-5117. S2CID 259872397.
  5. Sheybani, K.; Paydar, M. H.; Shariat, M. H. (2019-08-01). "Effect of mechanical activation on aluminothermic reduction of molybdenum trioxide". International Journal of Refractory Metals and Hard Materials. 82: 245–254. doi:10.1016/j.ijrmhm.2019.04.015. ISSN 0263-4368. S2CID 149603638.
  6. Ari, Monica; Miller, Kimberly J.; Marinkovic, Bojan A.; Jardim, Paula M.; de Avillez, Roberto; Rizzo, Fernando; White, Mary Anne (19 October 2010) . "Rapid synthesis of the low thermal expansion phase of Al2Mo3O12 via a sol–gel method using polyvinyl alcohol". Journal of Sol-Gel Science and Technology. 58. Springer (published 2011): 121–125. doi:10.1007/s10971-010-2364-9. S2CID 97549526.
  7. Amin, M.; El-Amir, M. A.; Ramadan, H. E.; El-Said, H. (2018-11-01). "99Mo/99mTc generators based on aluminum molybdate gel matrix prepared by nano method". Journal of Radioanalytical and Nuclear Chemistry. 318 (2): 915–922. doi:10.1007/s10967-018-6141-5. ISSN 1588-2780. S2CID 106317533.
  8. Harrison, William T. A. (1995-11-01). "Crystal structures of paraelastic aluminum molybdate and ferric molybdate, β-Al2(MoO4)3 and β-Fe2(MoO4)3". Materials Research Bulletin. 30 (11): 1325–1331. doi:10.1016/0025-5408(95)00157-3. ISSN 0025-5408.

External links

Aluminium compounds
Al(I)
Organoaluminium(I) compoundsAl(C5(CH3)5)
Al(II)
Al(III)
Alums
Organoaluminium(III) compounds
Molybdates and dimolybdates
Molybdates
Chloromolybdates
Dimolybdates
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