. Nurhayati. Characterization of Surface Acidity of Maredan Clay Catalyst Activated with Sulfuric Acid Using Boehm Titration and Pyridine Adsorption Method . NTPSR-V6 [Internet]. 2022 Jun. 15 [cited 2026 Jun. 11];:54-62. Available from: https://stm.bookpi.org/NTPSR-V6/article/view/7212