Tajuddin, NA;
Manayil, JC;
Isaacs, MA;
Parlett, CMA;
Lee, AF;
Wilson, K;
(2018)
Alkali-Free Zn-Al Layered Double Hydroxide Catalysts for Triglyceride Transesterification.
Catalysts
, 8
(12)
10.3390/catal8120667.
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Abstract
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.
| Type: | Article |
|---|---|
| Title: | Alkali-Free Zn-Al Layered Double Hydroxide Catalysts for Triglyceride Transesterification |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.3390/catal8120667 |
| Publisher version: | http://doi.org/10.3390/catal8120667 |
| Language: | English |
| Additional information: | Copyright © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
| Keywords: | biodiesel; layered double hydroxides; transesterification; solid base; triglycerides |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10069976 |
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