Phase Transformation of Rice Husk Ash in the Synthesis of ZSM-5 without Organic Template

Authors

  • Didik Prasetyoko 1Material Chemistry and Energy Laboratory, Department of Chemistry, Faculty of Mathematics and Sciences, Institut Teknologi Sepuluh Nopember, Kampus ITS Sukolilo, Surabaya, Jawa Timur 60111, Indonesia 2 Energy Laboratory, Center of Energy Study, Institut Teknologi Sepuluh Nopember, Kampus ITS Sukolilo, Surabaya, Jawa Timur 60111, Indonesia
  • Neneng Ayunanda 1Material Chemistry and Energy Laboratory, Department of Chemistry, Faculty of Mathematics and Sciences, Institut Teknologi Sepuluh Nopember, Kampus ITS Sukolilo, Surabaya, Jawa Timur 60111, Indonesia
  • Hamzah Fansuri 1Material Chemistry and Energy Laboratory, Department of Chemistry, Faculty of Mathematics and Sciences, Institut Teknologi Sepuluh Nopember, Kampus ITS Sukolilo, Surabaya, Jawa Timur 60111, Indonesia
  • Djoko Hartanto 1Material Chemistry and Energy Laboratory, Department of Chemistry, Faculty of Mathematics and Sciences, Institut Teknologi Sepuluh Nopember, Kampus ITS Sukolilo, Surabaya, Jawa Timur 60111, Indonesia
  • Zainab Ramli 3 Department of Chemistry, Faculty of Science, Universiti Teknologi Malaysia, Johor Bahru 81310, Malaysia

DOI:

https://doi.org/10.5614/itbj.sci.2012.44.3.5

Abstract

Phase transformation of rice husk ash in the synthesis of ZSM-5 without organic template at various crystallization times has been studied. Zeolite has been synthesized using the hydrothermal method at 175 C with molar ratio 10Na2O : 100SiO2 : 2Al2O3 : 1800H2O with addition of silicalite-1 as seed. Solids were characterized using X-ray diffraction (XRD), infrared (IR) spectroscopy and scanning electron microscopy (SEM) techniques. Analysis of the results of XRD and IR spectroscopy indicated that ZSM-5 crystalstarted to form at 12 h of crystallization time, reaching high crystallinity after 24 h. With a crystallization time of more than 48 h, the ZSM-5 crystals had completely transformed into more stable quartz phase. Results indicated that phase transformation has occurred, in which an amorphous phase of rice husk ash has been transformed to ZSM-5 crystal phase during the early crystallization stage and continued to transform to disordered α-cristobalite phase and lastly quartz phases. SEM showed that the morphology of the ZSM-5 crystal was of an irregular hexagonal shape with particle size distribution around 3-7 μm.

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