Alkali-Free Zn-Al Layered Double Hydroxide Catalysts for Triglyceride Transesterification

Nazrizawati A. Tajuddin, Jinesh C. Manayil, Mark A. Isaacs, Christopher M. A. Parlett, Adam F. Lee, Karen Wilson

    Research output: Contribution to journalArticlepeer-review


    Zn–Al layered double hydroxides (LDHs) of general formula [Zn2+(1−x)Al3+x(OH)2]x+(CO32−)x/2·yH2O are promising solid base catalysts for the transesterification of lipids to biofuels. However, conventional synthetic routes employ alkali hydroxide/carbonate precipitants which may contaminate the final LDH catalyst and biofuel. The use of (NH3)2CO3 and NH3OH as precipitants affords alkali-free Zn–Al-LDHs spanning a wide composition range. The hydrothermal reconstruction of calcined Zn–Al-LDHs offers superior solid basicity and catalytic activity for the transesterification of C4–C18 triglycerides with methanol, compared with cold liquid phase or vapour phase reconstruction. Hydrothermally activated Zn3.3–Al-LDH was stable towards leaching during transesterification
    Original languageEnglish
    Issue number12
    Publication statusPublished - Dec 2018


    • biodiesel
    • layered double hydroxides
    • transesterification
    • solid base
    • triglycerides


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