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Alkaline modified oil shale fly ash: Optimal synthesis conditions and preliminary tests on CO(2) adsorption
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2011 (English)In: Journal of Hazardous Materials, ISSN 0304-3894, E-ISSN 1873-3336, Vol. 196, 180-186 p.Article in journal (Refereed) Published
Abstract [en]

Environmentally friendly product, calcium-silica-aluminum hydrate, was synthesized from oil shale fly ash, which is rendered so far partly as an industrial waste. Reaction conditions were: temperature 130 and 160°C, NaOH concentrations 1, 3, 5 and 8M and synthesis time 24h. Optimal conditions were found to be 5M at 130°C at given parameter range. Original and activated ash samples were characterized by XRD, XRF, SEM, EFTEM, (29)Si MAS-NMR, BET and TGA. Semi-quantitative XRD and MAS-NMR showed that mainly tobermorites and katoite are formed during alkaline hydrothermal treatment. Physical adsorption of CO(2) on the surface of the original and activated ash samples was measured with thermo-gravimetric analysis. TGA showed that the physical adsorption of CO(2) on the oil shale fly ash sample increases from 0.06 to 3-4mass% after alkaline hydrothermal activation with NaOH. The activated product has a potential to be used in industrial processes for physical adsorption of CO(2) emissions.

Place, publisher, year, edition, pages
Amsterdam: Elsevier, 2011. Vol. 196, 180-186 p.
Keyword [en]
Oil shale fly ash, Tobermorite synthesis, CO2 thermo-gravimetric analysis
National Category
Chemical Sciences
URN: urn:nbn:se:umu:diva-48273DOI: 10.1016/j.jhazmat.2011.09.006PubMedID: 21943923OAI: diva2:447844
Available from: 2011-10-13 Created: 2011-10-13 Last updated: 2012-02-29Bibliographically approved

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Ritamäki, JohannesBoström, DanLarsson, WilliamKordás, KrisztiánMikkola, Jyri-Pekka
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Department of ChemistryEnergy Technology and Thermal Process Chemistry
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