This research has studied the synthesis of fatty acid ethyl esters for biodiesel production using heterogeneous SO₄²ˉ/TiO₂ catalysts supported by mesoporous silica. The characterization result of the catalyst using X-Ray of wide-angle powder (WAXRD) and Scanning Electron Microscope (SEM) gives information that the existence of silica as support of SO₄²ˉ/TiO₂ active site. Observation data were analyzed by Response Surface Design (Composite Central Design). The results of the conversion design

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... lysis, it was observed that the number of catalysts: 5%, Ethanol / PFAD molar ratio: 13 and reaction time: 2.25 hours as a variable for optimization of the esterification process The physical characterization of ethyl ester as biodiesel is recorded by viscosity and density according to ASTM D-6751. The presence of functional groups which show the formation of ethyl esters indicated by FTIR analysis as C-H (alkanes), C=O, C-O and C-H (alkyl, R). The composition and type of ethyl ester from fatty acids were determined through GC-MS analysis. The highest peaks are indicated as palmitate ethyl ester, stearate ethyl ester and oleate ethyl ester and inform that the esterification reaction carried out has succeeded in producing highquality biodiesel