Preparation of Consolidated Body Zeolite from Rice Husk Ash

Abstract:

Rice husks (RHs) are agricultural wastes which include approximately 20 mass% of silica (SiO₂). In Thailand, RHs have been applied as fuel for thermal power generation systems and a large amount of ash (Rice husk ash: RHA) was produced. In addition, our research group has reported before that binder-free consolidated zeolite A could be obtained by using SiO₂ powder with geopolymer reaction as a humidity conditioning material because zeolite A has been used as desiccant and builder for detergent with low silica content. Moreover, other kind of zeolite with high amount of SiO₂ content, such as ZSM-5, was under interest due to its good properties as catalytic activity and a unique pore structure. But, it was not widely utilized because of the difficulty of consolidated body preparation. Therefore, in the present study, the possibility of the usage of RHA as raw materials for consolidated zeolite A and ZSM-5 was investigated for the high-value application of RHA under specific heat treatment condition, molar ratio and preparation technique. After specimens were obtained, XRD analysis and SEM were charactarized for consolidated bodies to confirm cystalline phases and observe microstructure, respectively. Consolidated zeolite A was synthesized with heat treatment above 60°C. The sample heat treated at 60°C for 24 h consisted of homogeneous zeolite A particles with the size smaller than 1 μm. In addition, consolidated ZSM-5 was synthesized with an usual method as TPABr (Tetra propyl ammonium bromide) technique and research method as S.C. (seed crystal) technique. The results showed that although around 10 μm seed crystal was used, around 4~5 μm of ZSM-5 particles were obtained by S.C. technique. This result led to the possibility to use RHA with S.C. technique to synthesize consolidated body and control ZSM-5 particle size.

• Periodical: Key Engineering Materials (Volume 766)
• Pages: 105-110
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.766.105
• Online since: April 2018
• Authors: Masahiro Takahashi, Koki Shibata, Takeshi Shiono*
• Keywords: Geopolymer, Rice Husk Ash, Rice Husks (RHs), Zeolite

References

[1] Ramchandra Pode, Potential applications of rice husk ash waste from rice husk biomass power plant, Renewable and Sustainable Reviews 53 (2016) 1468-1485.

DOI: 10.1016/j.rser.2015.09.051

[2] FAO Statistical Yearbook World food and agriculture，FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED NATIONS；2013　ISBN 978-92-5-107396-4.

[3] Information on http://www.atbiopower.co.th.

[4] M. Matsuda, T. Shiono, Y. Okamoto, Effect of Microstructure of Consolidated Zeolite on Its Characteristic of Humidity Conditioning , Journal of the Society of Materials Science, Japan 63 (2014) 446-450.

DOI: 10.2472/jsms.63.446

[5] Hiroo Tominaga, Zeoraito no kagaku to ouyo, Koudansya Ltd., Japan, 71-96.

[6] Xiangju meng, Feng-Shou Xiao, Green Routes for Synthesis of Zeolites, Chem. Rev., 2014, 114 (2), 1521–1543.

[7] Joseph Davidovits, GEOPOLYMER Chemistry & Applications 2nd edition, Institut Géopolymère 16 rue Galilée, France, 61-65.

[8] Yuukei Takasaki, Noboru Ishizawa, Yasuki Namiki, Akira Yoshida, Takemi shibuya, Effects of Starting Compositions and Operating Conditions ZSM-5 from Kanuma Pumice, and the Properties of Catalysts in Alkylation of Toluene with Metahnol, Sekiyu Gakkaishi, 31, (4), (1988).

DOI: 10.1627/jpi1958.31.321