Thermal decomposition of the synthetic hydrotalcite woodallite

Bouzaid, J. M., Frost, R. L., Musumeci, A. W. and Martens, W. N. (2006). Thermal decomposition of the synthetic hydrotalcite woodallite. In: 15th Annual Workshop and Exhibition of the Canadian-Thermal-Analysis-Society, Boucheville, Canada, (745-749). 17 - 18 May 2005. doi:10.1007/s10973-005-7315-2


Author Bouzaid, J. M.
Frost, R. L.
Musumeci, A. W.
Martens, W. N.
Title of paper Thermal decomposition of the synthetic hydrotalcite woodallite
Conference name 15th Annual Workshop and Exhibition of the Canadian-Thermal-Analysis-Society
Conference location Boucheville, Canada
Conference dates 17 - 18 May 2005
Journal name Journal of Thermal Analysis and Calorimetry   Check publisher's open access policy
Place of Publication Budapest, Hungary
Publisher Akademiai Kiado Rt.
Publication Year 2006
Sub-type Fully published paper
DOI 10.1007/s10973-005-7315-2
ISSN 1388-6150
1572-8943
Volume 86
Issue 3
Start page 745
End page 749
Total pages 5
Language eng
Abstract/Summary The thermal stability and thermal decomposition pathways for synthetic woodallite have been determined using thermogravimetry in conjunction with evolved gas mass spectrometry. Chemical analysis showed the formula of the synthesised woodallite to be Mg6.28Cr1.72Cl(OH)16(CO3)0.36⋅8.3H2O and X-ray diffraction confirms the layered LDH structure. Dehydration of the woodallite occurred at 65°C. Dehydroxylation occurred at 302 and 338°C. Both steps were associated with the loss of carbonate. Hydrogen chloride gas was evolved over a wide temperature range centred on 507°C. The products of the thermal decomposition were MgO and a spinel MgCr2O4. Experimentally it was found to be difficult to eliminate CO2 from inclusion in the interlayer during the synthesis of the woodallite compound and in this way the synthesised woodallite resembled the natural mineral.
Keyword Dehydration
Dehydroxylation
High-resolution thermogravimetry
Hydrotalcite
Iowaite
Woodallite
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status Non-UQ

 
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