*2.1.1 Materials*

The materials used in this study were synthetic mordenite type zeolite (HSZ-640HOA, Tosoh Corporation Japan®), NH4Cl, NaOH, 37% HCl, 40% HF, 65% HNO3, and 25% NH3 (Merck®). Besides, cellulose (Sigma-Aldrich #C8002), Whatman filter paper No.42, bi-distilled water, N2, and H2 gas (PT. Samator Gas) were utilized.
