Nurhayati, NurhayatiAkbar, Emil2018-10-222018-10-222018-10-222086-4310wahyu sari yenihttp://repository.unri.ac.id/handle/123456789/9458The transesterification of palm olein to fatty acid methyl esters was studied using NaOH/ZnO catalyst. The catalyst was prepared by impregnation with the loading of NaOH 25% w/w NaOH on ZnO calcined at 600 •c for 6 hours. Biodiesel samples were first analyzed using gas chromatography according to ASTM methods. The influence of reaction temperature and reaction time on transesterification was examined. Optimum reaction condition was achieved at reflux of methanol (65°C K) for about 120 minute. The conversion of vegetable oil was found to be 99.7%. A reducible catalyst was also studied. The catalyst showed high activity, with oil conversion being obtained under mild conditions (reflux temperature of methanol).enbiodieseltransesterificationheterogeneous catalystzinc oxideArticle