Abstract
This study presents a way of using South African coal fly ash by extracting metals such as Al and Fe with concentrated sulphuric acid, and then using the solid residue as a feedstock for the synthesis of ZSM-5 zeolite. The percentage of aluminum and iron oxides decreased from 28.0 ± 0.2% and 5.0 ± 0.1% in coal fly ash to 24.6 ± 0.1% and 1.6 ± 0.01% in the acid treated coal fly ash respectively. The fly ash-based zeolite ZSM-5 sample synthesized from the solid residue after extraction of Al and Fe, contained 62% of ZSM-5 zeolite pure phase with a number of Brønsted acid site density of 0.61 mmol per gzeolite. By properly treating the as-prepared coal fly ash-based ZSM-5 zeolite, an active and selective methanol-to-olefins acid catalyst could be designed, leading to full methanol conversion during 15 h on stream. The optimized catalyst exhibited a cumulative methanol conversion capacity of 71 g(MeOHconverted)/g(catalyst) and a light olefin productivity of 21 g(C2=–C4=)/g(catalyst).
Recommended Citation
R. N. Missengue et al., "Transformation of South African Coal Fly Ash into ZSM-5 Zeolite and its Application as an MTO Catalyst," Comptes Rendus Chimie, vol. 20, no. 1, pp. 78 - 86, Académie des Sciences, Jan 2017.
The definitive version is available at https://doi.org/10.1016/j.crci.2016.04.012
Department(s)
Mining Engineering
Keywords and Phrases
Acid leaching; Fly ash; Metal extraction; MTO catalyst; ZSM-5 zeolite
International Standard Serial Number (ISSN)
1631-0748
Document Type
Article - Journal
Document Version
Final Version
File Type
text
Language(s)
English
Rights
© 2024 The Authors, All rights reserved.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution 4.0 License.
Publication Date
01 Jan 2017
