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Conversion of South African Coal Fly Ash into High-Purity ZSM-5 Zeolite without Additional Source of Silica or Alumina and Its Application as a Methanol-to-Olefins Catalyst

1
Department of Chemistry, University of the Western Cape, 7535 Cape Town, South Africa
2
Institute of Chemistry, UMR 7177, University of Strasbourg, CNRS, 67000 Strasbourg, France
3
Council for Scientific and Industrial Research, 0001 Pretoria, South Africa
*
Author to whom correspondence should be addressed.
Current address: Department of Research and Development, AgriProtein Technologies, 7750 Cape Town, South Africa.
Catalysts 2018, 8(4), 124; https://doi.org/10.3390/catal8040124
Received: 19 October 2017 / Revised: 10 November 2017 / Accepted: 14 November 2017 / Published: 21 March 2018
Characteristics of ZSM-5 synthesized from H2SO4-treated coal fly ash and fused coal fly ash extracts are compared in this study. In the synthesis process, fused coal fly ash extract (without an additional silica source) was used in the synthesis of ZSM-5. The effect of the structure-directing agent (tetrapropylammonium bromide, 1,6-hexanediamine or 1-propylamine) on the properties and methanol-to-olefins (MTO) effectiveness of the fly ash-based ZSM-5 was also investigated. A pure ZSM-5 synthesized from the fused coal fly ash extract led to a methanol conversion higher than 90% after 5 h on stream. The template 1,6-hexanediamine led to the synthesis of the most stable fly ash-based catalyst keeping a 44% methanol conversion after 24 h on stream. View Full-Text
Keywords: coal fly ash; coal fly ash extract; oxalic acid treatment; structure-directing agent; ZSM-5 and methanol-to-olefins coal fly ash; coal fly ash extract; oxalic acid treatment; structure-directing agent; ZSM-5 and methanol-to-olefins
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Missengue, R.N.M.; Losch, P.; Musyoka, N.M.; Louis, B.; Pale, P.; Petrik, L.F. Conversion of South African Coal Fly Ash into High-Purity ZSM-5 Zeolite without Additional Source of Silica or Alumina and Its Application as a Methanol-to-Olefins Catalyst. Catalysts 2018, 8, 124.

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