TY - JOUR

T1 - Direct CO2 capture from ambient air using K2CO 3/Y2O3 composite sorbent

AU - Derevschikov, Vladimir S.

AU - Veselovskaya, Janna V.

AU - Kardash, Tatyana Yu

AU - Trubitsyn, Dmitry A.

AU - Okunev, Aleksey G.

PY - 2014/7/1

Y1 - 2014/7/1

N2 - Carbonate-bicarbonate looping was tested for direct CO2 capture from air using a composite sorbent K2CO3/Y 2O3. The phase composition, the porous structure and the texture of the composite sorbent were characterized by means of X-ray diffraction, mercury intrusion and scanning electron microscopy methods. The thermal properties of the sorbent were additionally studied by X-ray diffraction in situ and thermogravimetry methods. CO2 absorption from air and desorption experiments were performed in a continuous-flow system. The effect of regeneration temperature on CO2 uptake was investigated. It was shown that CO2 absorption uptake from air is about 28 mg (CO 2)/g in temperature swing absorption cycles within regeneration temperature range of 150-250 °C. However, the increase of the regeneration temperature up to 300°C results in gradual decrease of the absorption uptake down to 10 mg (CO2)/g. The XRD pattern of the cycled sample contains a set of reflections that cannot be assigned to any known potassium- or yttrium-containing crystalline phase. The new phase, which is thermally stable up to 460°C, accumulates potassium ions and is, probably, responsible for the sorbent capacity decay.

AB - Carbonate-bicarbonate looping was tested for direct CO2 capture from air using a composite sorbent K2CO3/Y 2O3. The phase composition, the porous structure and the texture of the composite sorbent were characterized by means of X-ray diffraction, mercury intrusion and scanning electron microscopy methods. The thermal properties of the sorbent were additionally studied by X-ray diffraction in situ and thermogravimetry methods. CO2 absorption from air and desorption experiments were performed in a continuous-flow system. The effect of regeneration temperature on CO2 uptake was investigated. It was shown that CO2 absorption uptake from air is about 28 mg (CO 2)/g in temperature swing absorption cycles within regeneration temperature range of 150-250 °C. However, the increase of the regeneration temperature up to 300°C results in gradual decrease of the absorption uptake down to 10 mg (CO2)/g. The XRD pattern of the cycled sample contains a set of reflections that cannot be assigned to any known potassium- or yttrium-containing crystalline phase. The new phase, which is thermally stable up to 460°C, accumulates potassium ions and is, probably, responsible for the sorbent capacity decay.

KW - Carbon dioxide

KW - Composite material

KW - Potassium carbonate

KW - Yttria

UR - http://www.scopus.com/inward/record.url?scp=84897481426&partnerID=8YFLogxK

U2 - 10.1016/j.fuel.2013.09.060

DO - 10.1016/j.fuel.2013.09.060

M3 - Article

AN - SCOPUS:84897481426

VL - 127

SP - 212

EP - 218

JO - Fuel

JF - Fuel

SN - 0016-2361

ER -