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Study on the effect of inorganic aluminum sources on ZSM-5 zeolite synthesis by solvent-free method from rice husk ash

Fei Ji, Changquan Zhang, and Yonghong Mi

Shenzhen Environmental Technology Group Co. Ltd, Shenzhen, China



Received: 27 June 2023  Accepted: 18 October 2023


The effect of different inorganic aluminum sources on the synthesis of ZSM-5 zeolite was firstly investigated under solvent-free conditions using rice husk ash as the silicon source in this paper. XRD, SEM, TEM, 27Al MAS NMR, BET and NH3-TPD were adopted to study the effects of different aluminum sources on the crystal growth, morphology, and properties of ZSM-5 zeolite. The research results indicate that different aluminum sources have varying effects on the crystallization rate and crystallinity of ZSM-5 zeolite, and Al(NO3)3·9H2O and AlCl3·6H2O are not conducive to the synthesis of ZSM-5 zeolite. Under the same synthetic conditions, the ZSM-5 zeolites synthesized from different aluminum sources exhibit lamellar crystal accumulation, results in the ZSM-5 zeolite had a micro-mesoporous physical structure. Only tetrahedral aluminum of ZSM-5 zeolite exist in synthetic when Al2(SO4)3 and Al2(SO4)3·18H2O are used as aluminum source, nevertheless, there are framework of ZSM-5 zeolite and extraframework aluminum in the products when Al(OH)3 and NaAlO2 are used as aluminum source, lead to different surface properties of synthesized products. The research conclusion of this article provides a basis for the selection of inorganic aluminum sources for the solventless synthesis of ZSM-5 zeolite from rice husk ash.

Keywords: ZSM-5 zeolite; Inorganic aluminum source; Solvent-free synthesis; Rice husk ash

Full paper is available at

DOI: 10.1007/s11696-023-03160-0


Chemical Papers 78 (2) 1217–1226 (2024)

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