Sugarcane Bagasse Biochar as a Solid Catalyst: From Literature Review of Heterogeneous Catalysts for Esterifications to the Experiments for Biodiesel Synthesis from Palm Oil Industry Waste Residue. Indones. j. sci. technol. 2021;6(2):337-352. Accessed June 7, 2026. https://ijost.upi.edu/index.php/ijost/article/view/302