Effects of Ageing and Seeding on the Formation of Zeolite Y from Coal Fly Ash

Zhao, X. S., Lu, G. Q. and Zhu, H. Y. (1997) Effects of Ageing and Seeding on the Formation of Zeolite Y from Coal Fly Ash. Journal of Porous Materials, 4 4: 245-251. doi:10.1023/A:1009669104923


Author Zhao, X. S.
Lu, G. Q.
Zhu, H. Y.
Title Effects of Ageing and Seeding on the Formation of Zeolite Y from Coal Fly Ash
Journal name Journal of Porous Materials   Check publisher's open access policy
ISSN 1380-2224
Publication date 1997-10-01
Year available 1997
Sub-type Article (original research)
DOI 10.1023/A:1009669104923
Open Access Status Not yet assessed
Volume 4
Issue 4
Start page 245
End page 251
Total pages 7
Place of publication DORDRECHT
Publisher SPRINGER
Language eng
Abstract Zeolite Y was selectively synthesised by treating Tarong fly ash in a hydrothermal system. The effects of ageing and seeding on the formation of the resultant phases, crystallisation kinetics, and gel chemistry of Si and Al were investigated. Most of the Si and Al components in the Tarong fly ash could be effectively transformed into zeolite Y in the presence of seeds but not the mineral phase, like mullite. The maximum crystallinity of zeolite Y obtained was 72%. The cation-exchange capacity (CEC) of the fly ash was 0.08 mmol/g but increased to 3.2 mmol/g after a proper treatment. Crystallisation of zeolite materials from fly ash is quite different from that of normal zeolite synthesis because the sources of Si and Al are relatively less reactive and other cation ions (e.g., K(+), Mg(2+)) are present in fly ash. Zeolite P is a competitive phase present in the resulting products that could be eliminated by employing the seeding method. NMR study demonstrated that ageing plays an important role in enhancing the hydrothermal condition during which both Si and Al in fly ash dissolved into a basic solution and reacted to form ring-like structures, and further to zeolite materials. Seeding can selectively induce the formation of zeolite Y and eliminate the processes of induction and nucleation.
Keyword fly ash
zeolite Y
ageing
seeding
Nmr
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: ResearcherID Downloads - Archived
 
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