Study on Synthesis of Solid Acid Catalyst from Borassus flabellifer L. Waste with Sulfonation Method: Kajian Sintesis Katalis Asam Padat dari Limbah Sabut Siwalan (Borassus flabellifer L.) dengan Metode Sulfonasi. Journal Pharmasci (Journal of Pharmacy and Science), [S. l.], v. 6, n. 2, p. 89–97, 2021. DOI: 10.53342/pharmasci.v6i2.224. Disponível em: https://ejournal.akfarsurabaya.ac.id/index.php/jps/article/view/224. Acesso em: 11 nov. 2026.