Direct CO2 sequestration onto alkaline modified oil shale fly ash

A1 Journal article (refereed)

Internal Authors/Editors

Publication Details

List of Authors: Janek Reinik, Ivo Heinmaa, Johannes Ritamäki, Dan Boström, Eva Pongrácz, Mika Huuhtanen, William Larsson, Riitta Keiski, Kristián Kordás, Jyri-Pekka Mikkola
Publication year: 2014
Journal: Oil Shale
Volume number: 31
Issue number: 1
Start page: 79
End page: 90
eISSN: 1736-7492


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.

Last updated on 2020-07-06 at 03:15