Characterization of carbonated serpentine using XPS and TEM

Fixation of CO2 by chrysotile in low-pressure dry and moist carbonation: Ex-situ and in-situ characterizations

“…Mg 2p core electrons in the unreacted bare and Cs-doped chrysotile exhibit slightly larger BE than in the case of periclase with a tendency for Mg 2p binding energy to shift to higher values after carbonation. This shift in BE of Mg 2p core electrons upon carbonation is unlike the observations reported by Schulze et al (2004) on the hydrothermal carbonation of lizardite in a high-pressure high-temperature slurry reactor. Mg 2p core electrons shifted to higher BEs not because of carbonation of lizardite but due to preliminary thermal treatment of the material.…”

“…(ii) Ex-situ sequestration as high-pressure/high-temperature aqueous (or wet) single/multistep carbonation chemistries involving leaching and dissolution of serpentine and subsequent precipitation of magnesium carbonate using as a substrate olivine (O'Connor et al, 2002;Park and Fan, 2004;Béarat et al, 2006;Gerdemann et al, 2007), and serpentine polymorphs: lizardite (McKelvy et al, 2004;Schulze et al, 2004;Gerdemann et al, 2007), and antigorite (Marato-Valer et al, 2005;Gerdemann et al, 2007;Krevor and Lackner, 2009). (iii) Ex-situ sequestration as high-pressure/high-temperature gas-solid carbonation of antigorite/lizardite/ chrysotile natural mixtures (Zevenhoven and Kohlmann, 2001;Zevenhoven et al, 2006;Fagerlund et al, 2009).…”

Experimental Perspectives of Mineral Dissolution and Precipitation due to Carbon Dioxide-Water-Rock Interactions

“…The dissolution of serpentine during carbonation first produces an amorphous silica-rich layer before magnesite precipitates. This layer is the limiting step for cation diffusion and reduces reaction progress (Schulze et al 2004). Pre-heating (up to 630¡C) and grinding have been proposed to optimize ex-situ CO 2 processing by causing dehydroxylation and increasing reactive surface area, respectively.…”

Acid-dissolution of antigorite, chrysotile and lizardite for ex situ carbon capture and storage by mineralisation

“…Previous CCSM studies were performed under a wide range of physical and chemical conditions and mostly utilized only one type of serpentine, e.g. antigorite [Krevor and Lackner, 2011;Maroto-Valer et al, 2004;Park and Fan, 2004 and references therein]; lizardite [Daval et al, 2013;Sanna et al, 2013;Schulze et al, 2004;Wolf et al, 2004]; or chrysotile [Ryu et al, 2011;Rozalen et al, 2013]. Only a few have utilized two types of serpentine, lizardite and antigorite [O'Connor et al, 2002;Styles et al, 2014], and three or more have never been investigated under the same processing conditions, preventing a realistic comparison of the effects of mineral structure and composition on cation release; i.e.…”