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Thermal decomposition of hydrotalcites. An infrared and nuclear magnetic resonance spectroscopic study
Abstract
Calcined hydrotalcites have been used extensively as catalysts for base-catalysed reactions. The calcination procedure in critical in determining the behaviour of the final material. The characteristics of the hydrotalcite, following the different stages of calcination, have been studied by means of thermogravimetric (TG), X-ray diffraction (XRD), IR, 1H and 27Al NMR techniques. We have shown that dehydroxylation begins within layers and then in a second stage occurs between adjacent layers, causing collapse of the structure. This process is accompanied by a change from octahedral to tetrahedral coordination of the aluminium. Decarbonation leads to the formation of micropores of radius <1.75 nm. Dehydroxylation and decarbonation are reversible processes, and their rates depend on the calcination temperature.
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Bernal, S. A., Provis, J. L., Walkley, B., San Nicolas, R., Gehman, J. D., Brice, D. G., Kilcullen, A. R., Duxson, P., & van Deventer, J. S. J. (2013) · Cement and Concrete Research · doi:10.1016/j.cemconres.2013.06.007 · Cited by 1,019
Microstructural changes in alkali-activated slag mortars induced by accelerated carbonation
Li, N., Farzadnia, N., & Shi, C. (2017) · Cement and Concrete Research · doi:10.1016/j.cemconres.2017.07.008 · Cited by 488
Activation of Mg–Al Hydrotalcite Catalysts for Aldol Condensation Reactions
Rao, K. K., Gravelle, M., Valente, J. S., & Figueras, F. (1998) · Journal of Catalysis · doi:10.1006/jcat.1997.1878 · Cited by 337
A parametric study of accelerated carbonation in alkali-activated slag
McCaslin, E. R., & White, C. E. (2021) · Cement and Concrete Research · doi:10.1016/j.cemconres.2021.106454 · Cited by 65
Metadata
- Authors
- Rey, F., Fornés, V., & Rojo, J. M.
- Venue
- J. Chem. Soc., Faraday Trans.
- Publisher
- Royal Society of Chemistry (RSC)
- Published
- 1992
- Volume
- 88
- Issue
- 15
- Pages
- 2233-2238
- ISSN
- 0956-5000 (ISSN-L)
- 1364-5455
- OpenAlex
- W2090795844
- Cited by
- 304
- References
- 0
- FWCI
- 2.82
- Type
- journal article
- Language
- en
- Open access
- closed
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- Rey, F., Fornés, V., & Rojo, J. M. (1992). Thermal decomposition of hydrotalcites. An infrared and nuclear magnetic resonance spectroscopic study. J. Chem. Soc., Faraday Trans. https://doi.org/10.1039/ft9928802233
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