Direct CO2 sequestration onto alkaline modified oil shale fly ash

Janek Reinik, Ivo Heinmaa, Johannes Ritamäki, Dan Boström, Eva Pongrácz, Mika Huuhtanen, William Larsson, Riitta Keiski, Kristián Kordás, Jyri-Pekka Mikkola

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    The present study focuses on the direct chemical adsorption of CO2 onto alkaline hydrothermally activated oil shale fly ash (OSFA). The CO2 chemisorption experiments were conducted in a high-pressure reactor at a temperature of 150 degrees C and CO2 partial pressure of 100 bar during a 24-hour period. Original, activated and chemisorbed OSFA samples were characterized by means of X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM) coupled with energy-dispersive X-ray spectroscopy (EDS), specific surface area (BETN2) and high-resolution Si-29 magic angle spinning nuclear magnetic resonance (MAS-NMR). The results indicated moderate weight increase (max 5 wt%) and according to XRD and MAS-NMR analysis tobermorites had reacted with CO2, leading to calcite formation. The results also show that the alkaline hydrothermally activated OSFA has a potential to be used in industrial processes for direct chemical adsorption of CO2 from flue gases.
    Original languageUndefined/Unknown
    Pages (from-to)79–90
    JournalOil Shale
    Issue number1
    Publication statusPublished - 2014
    MoE publication typeA1 Journal article-refereed

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