High-purity CaO cubic crystallites extracted from limestone exhibited excellent activity as base catalysts for waste cooking oil (WCO) conversion into biodiesel. Saponin from extract acted as a surfactant in CaO extraction and transformation into well-defined cubic microcrystallites. The application of saponin from extract as a surfactant for CaO production results in a high level of CaO purity and particle size reduction compared to directly calcined limestone (CaO-MgO). The catalytic activity was evaluated on CaO from hydrothermal and co-precipitation synthesis, MgO and CaO-MgO derived from limestone, giving hydrothermal CaO catalysts enhanced biodiesel yield. Optimization of transesterification conditions using Box Behnken Design response surface methodology achieved 92.40% biodiesel yield at 65 °C, 3 h reaction time and when using 5% of CaO catalysts.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11267255 | PMC |
| http://dx.doi.org/10.1039/d4ra03489a | DOI Listing |
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