TY - JOUR
T1 - 23Na and 27Al NMR study of the products from carbonation of a Bayer liquor
AU - Bastow, Timothy J.
AU - Dirken, Peter J.
AU - Smith, Mark E.
AU - Turney, Terence W.
PY - 1995/1/1
Y1 - 1995/1/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=3643105719&partnerID=8YFLogxK
U2 - 10.1039/jm9950500521
DO - 10.1039/jm9950500521
M3 - Article
AN - SCOPUS:3643105719
VL - 5
SP - 521
EP - 525
JO - Journal of Materials Chemistry
JF - Journal of Materials Chemistry
SN - 0959-9428
IS - 3
ER -