Mg-Al hydrotalcite coatings have been grown on alumina via a novel alkali- and nitrate-free impregnation route and subsequent calcination and hydrothermal treatment. The resulting Mg-HT/AlO catalysts significantly outperform conventional bulk hydrotalcites prepared via co-precipitation in the transesterification of C-C triglycerides for fatty acid methyl ester (FAME) production, with rate enhancements increasing with alkyl chain length. This promotion is attributed to improved accessibility of bulky triglycerides to active surface base sites over the higher area alumina support compared to conventional hydrotalcites wherein many active sites are confined within the micropores.
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Funding: EPSRC (EP/G007594/3, a Leadership Fellowship and studentship); and the Royal Society for the award of an Industry Fellowship.
Electronic supplementary information: DOI 10.1039/c3cy00902e
Creasey, J. J., Chieregato, A., Manayil, J. C., Parlett, C. M. A., Wilson, K., & Lee, A. F. (2014). Alkali- and nitrate-free synthesis of highly active Mg-Al hydrotalcite-coated alumina for FAME production. Catalysis Science and Technology, 4(3), 861-870. https://doi.org/10.1039/c3cy00902e