TY - JOUR

T1 - Effect of the Composition and Synthesis Method on the Sorption Properties of NaNO3/MgO Sorbents with Respect to Carbon Dioxide

AU - Nikulina, I. E.

AU - Derevshchikov, V. S.

AU - Pakharukova, V. P.

AU - Snytnikov, P. V.

AU - Potemkin, D. I.

N1 - This work was supported by the Russian Science Foundation (project no. 21-79-10377; I.E. Nikulina, V.S. Derevshchikov, and D.I. Potemkin).

PY - 2024/6

Y1 - 2024/6

N2 - Abstract: In this work, sorbents based on magnesium oxide MgO modified with NaNO3 taken in a concentration of 5–50 mol % have been synthesized and studied by various methods. It has been shown that the optimum synthesis method is impregnation of the MgO precursor. The optimum concentration of NaNO3 as a modifier is 10 mol %; this concentration provides a sorption capacity of 6.5 mmol CO2/gsorb within 1 h of sorption at 320°C and a CO2 content of 50 vol %. The sorption capacity achieved in 10 consecutive sorption–desorption cycles for 10 mol % NaNO3 is 4.5–5.5 mmol CO2/gsorb within 30 min of sorption at 50 vol % CO2 and temperatures of 300 and 350°C for the sorption and desorption stages, respectively. It has been found that an increase in the total sorption pressure to 10 atm makes it possible to decrease the sorption temperature to 220–260°C, and the achieved sorption capacity is 4.0 mmol CO2/gsorb at 25 vol % CO2, which is almost 2 times higher than the sorption capacity value at 1 atm. It has been shown that treatment with steam and hydrogen does not lead to a significant change in the sorption properties and phase composition of MgO modified with NaNO3.

AB - Abstract: In this work, sorbents based on magnesium oxide MgO modified with NaNO3 taken in a concentration of 5–50 mol % have been synthesized and studied by various methods. It has been shown that the optimum synthesis method is impregnation of the MgO precursor. The optimum concentration of NaNO3 as a modifier is 10 mol %; this concentration provides a sorption capacity of 6.5 mmol CO2/gsorb within 1 h of sorption at 320°C and a CO2 content of 50 vol %. The sorption capacity achieved in 10 consecutive sorption–desorption cycles for 10 mol % NaNO3 is 4.5–5.5 mmol CO2/gsorb within 30 min of sorption at 50 vol % CO2 and temperatures of 300 and 350°C for the sorption and desorption stages, respectively. It has been found that an increase in the total sorption pressure to 10 atm makes it possible to decrease the sorption temperature to 220–260°C, and the achieved sorption capacity is 4.0 mmol CO2/gsorb at 25 vol % CO2, which is almost 2 times higher than the sorption capacity value at 1 atm. It has been shown that treatment with steam and hydrogen does not lead to a significant change in the sorption properties and phase composition of MgO modified with NaNO3.

KW - CO2 sorption

KW - NaNO3

KW - hydrogen purification

KW - magnesium oxide

KW - sorption-enhanced catalytic steam reforming of CO

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85194890811&origin=inward&txGid=1d7a7624d5e2eb9834f33238b204eeaf

UR - https://www.mendeley.com/catalogue/f511ebbf-233e-3866-80dc-abfeb48ad2a1/

U2 - 10.1134/S2070050424700016

DO - 10.1134/S2070050424700016

M3 - Article

VL - 16

SP - 111

EP - 122

JO - Catalysis in Industry

JF - Catalysis in Industry

SN - 2070-0504

IS - 2

ER -