Fatty acid methyl ester Fatty acids 8 Esters 5 Biodiesel 4 Catalysts 4 Esterification 4 Heterogeneous catalyst 4 Palm fatty acid distillate 4 Biodiesel production 3 Chromium compounds 3 Molar ratio 3 Reaction temperature 3 Transesterification 3 Batch reactors 2 Binary alloys 2 Carbohydrate-derived solid acid catalyst 2 Catalytic esterification 2 Chromium alloys 2 Energy conservation 2 Feedstocks 2 Methanol 2 Mixed oxides catalysts 2 Nanostructured materials 2 Palm oil 2 Pore size 2 Sol-gel process 2 Sol-gels 2 Supercritical methanol 2 Titanium alloys 2 Titanium oxides 2