Aluminium carbonate

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Aluminium Carbonate
Names
IUPAC name
Dialuminium Tricarbonate
Identifiers
3D model (
JSmol
)
ChemSpider
ECHA InfoCard
 100.034.930 Edit this at Wikidata
UNII
  • InChI=1S/3CH2O3.2Al/c3*2-1(3)4;;/h3*(H2,2,3,4);;/q;;;2*+3/p-6
    Key: PPQREHKVAOVYBT-UHFFFAOYSA-H
  • C(=O)([O-])[O-].C(=O)([O-])[O-].C(=O)([O-])[O-].[Al+3].[Al+3]
Properties
Al2(CO3)3
Appearance white powder, unstable
Density 1.5 g/cm3
Melting point 58 °C
Boiling point decomposes
reacts
Structure[1]
orthorhombic
Fdd2
a = 21.989, b = 10.176, c = 4.4230
989.7
8
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Aluminium carbonate (Al2(CO3)3), is a carbonate of aluminium. It is not well characterized; one authority says that simple carbonates of aluminium are not known.[2] However related compounds are known, such as the basic sodium aluminium carbonate mineral dawsonite (NaAlCO3(OH)2) and hydrated basic aluminium carbonate minerals scarbroite (Al5(CO3)(OH)13•5(H2O)) and hydroscarbroite (Al14(CO3)3(OH)36•nH2O).[3][4][5]

Preparation

For many years there was no evidence for the existence of any carbonate-containing

ternary Al-C-O phase, i.e., Al2(CO3)3,[6] however in 2023 Al2[CO3]3 and Al2[C2O5][CO3]2 (dialuminium carbonate pyrocarbonate) were produced with a carbon dioxide pressure of 24 and 38 GPa. This means that the Earth's mantle may contain aluminium carbonate minerals.[7]

Some minerals contain both aluminium and carbonate. Dawsonite has the formula NaAlCO3(OH)2. Hydrotalcites, both synthetic and natural, are layered metal hydroxides comprised in part of aluminium and carbonate.[8]

Surface carbonate species readily form upon exposure of aluminium oxide to CO2.[9]

Uses

Aluminium carbonate, along with aluminium hydroxide and aluminium oxide, is a phosphate-binding drug that is sometimes administered to dogs and cats to bind intestinal phosphate and prevent the absorption of dietary phosphate as well as to decrease absorption of phosphate excreted by the pancreas. It is seldom used in humans because of concerns with toxicity, but cats and dogs do not appear to have a toxic response to its presence.[10]

The reaction of aluminium sulfate and sodium bicarbonate forms carbon dioxide and aluminium hydroxide which stabilises the formation of a foam.[6] This reaction was the basis of an early fire extinguisher invented by Aleksandr Loran in 1904.


References

  1. doi:10.5517/ccdc.csd.cc2ftvfk
    .
  2. ISBN 978-0-7514-0103-5
  3. ^ "Scarbroite". www.mindat.org.
  4. ^ "Hydroscarbroite". www.mindat.org.
  5. ^ "Dawsonite". www.mindat.org. Retrieved 2020-12-14.
  6. ^
    ISBN 9781483280080
    .
  7. S2CID 260898136
    .
  8. doi:10.1002/(SICI)1099-0682(199810)1998:10<1439::AID-EJIC1439>3.0.CO;2-1
    .
  9. ISSN 0022-4944
    .
  10. ISBN 978-1-4160-6926-3
    .
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