ESTONIAN ACADEMY
PUBLISHERS
eesti teaduste
akadeemia kirjastus
PUBLISHED
SINCE 1984
 
Oil Shale cover
Oil Shale
ISSN 1736-7492 (Electronic)
ISSN 0208-189X (Print)
Impact Factor (2020): 0.934

DIRECT CO2 SEQUESTRATION ONTO ALKALINE MODIFIED OIL SHALE FLY ASH; pp. 79–90

Full article in PDF format | doi: 10.3176/oil.2014.1.08

Authors
JANEK REINIK, IVO HEINMAA, JOHANNES RITAMÄKI, DAN BOSTRÖM, EVA PONGRÁCZ, MIKA HUUHTANEN, WILLIAM LARSSON, RIITTA KEISKI, KRISZTIÁN KORDÁS, JYRI-PEKKA MIKKOLA

Abstract

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 °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 29Si 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.


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