Biodiesel Synthesis from Nyamplung (Calophyllum Inophyllum) Oil Using Heterogenous Modified Geopolymer Catalyst Derived from KaolinPanca Setia Utama, Nabil Syahada, Barata Aditya Prawiranegara and Edy SaputraE3S Web of Conf., 517 (2024) 08001DOI: https://doi.org/10.1051/e3sconf/202451708001