ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

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

E-mail: zcq12390@126.com

Received: 27 June 2023  Accepted: 18 October 2023

Abstract:

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 www.springerlink.com.

DOI: 10.1007/s11696-023-03160-0

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