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. Pharmasci [Internet]. 2021 Jul. 20 [cited 2026 Nov. 12];6(2):89-97. Available from: https://ejournal.akfarsurabaya.ac.id/index.php/jps/article/view/224