Optimization of Pretreatment and Hydrothermal Process of Na-X Zeolite from Kaolin and Metakaolin

Hartati, Satya Candra Wibawa Sakti, Putri Bintang Dea Firda, Chabibah Saidah

Research output: Contribution to journalArticlepeer-review


Synthesis of Na-X zeolite was conducted from kaolin and metakaolin. Synthesis varied in its pretreatment method and hydrothermal conditions. The pretreatment methods used were: conventional alkaline, alkaline fusion and conventional fluoride. Hydrothermal conditions for the experiments were gradual temperature 40°C (6h), 60°C (6h), 80°C (12h), and constant temperature 80°C for 24 h, 100°C for 24 and 100°C for 48 h. Synthesized products were characterized by X-Ray Diffraction (XRD), Fourier Transform InfraRed (FTIR), Scanning Electron Microscopy-Energy Dispersive X-Ray (SEM-EDX), and N2 Isotherm Adsorption/Desorption method. The result showed that pre-treatment by conventional fluoride could not produce Na-X zeolite, synthesis by conventional alkaline and alkaline fusion with hydrothermal at 100°C (48h), 100°C (24 h), and gradual temperature produce Na-X zeolite with Na-P1 or Na-A zeolite as impurities, while synthesis from metakaolin by conventional alkaline with hydrothermal at 80°C for 24 hours produced pure Na-X zeolite. Na-X zeolite and Na-P1 zeolite with hierarchical pores were synthesized through alkali fusion with hydrothermal at 100°C for 24 hours.

Original languageEnglish
Pages (from-to)202-210
Number of pages9
JournalJurnal Kimia Valensi
Issue number2
Publication statusPublished - Nov 2019


  • NaX zeolite
  • conventional alkaline
  • conventional fluoride
  • hydrothermal
  • kaolin


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