23Na and 27Al NMR study of the products from carbonation of a Bayer liquor

Timothy J. Bastow, Peter J. Dirken, Mark E. Smith, Terence W. Turney

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A multinuclear magnetic resonance methodology combining magic angle spinning, cross-polarisation and double angle rotation has been used to characterise the product from the carbonation of a Bayer liquor as predominantly well ordered NaAlCO3(OH)2 (dawsonite). The NMR spectra are dominated by resonances from this phase, but accurate simulation requires additional minor components, most likely a mixture of a poorly ordered aluminium hydroxide gel and an amorphous phase related to NaHCO3, which is not observed by X-ray diffraction. Thermal decomposition of dawsonite at 350°C proceeds through partial loss of CO2 and OH with concomitant formation of disordered materials containing sodium species, four-, five- and six-fold coordinate Al sites, and two types of residual carbonate.

Original languageEnglish
Pages (from-to)521-525
Number of pages5
JournalJournal of Materials Chemistry
Issue number3
Publication statusPublished - 1 Jan 1995
Externally publishedYes

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