Deciphering the structural dynamics in molten salt-promoted MgO-based CO2 sorbents and their role in the CO2 uptake

被引:14
作者
Rekhtina, Margarita [1 ]
Krodel, Maximilian [1 ]
Wu, Yi-Hsuan [1 ]
Kierzkowska, Agnieszka [1 ]
Donat, Felix [1 ]
Abdala, Paula M. [1 ]
Muller, Christoph R. [1 ]
机构
[1] Swiss Fed Inst Technol, Dept Mech & Proc Engn, Lab Energy Sci & Engn, Leonhardstr 21, CH-8092 Zurich, Switzerland
基金
瑞士国家科学基金会; 欧洲研究理事会;
关键词
METAL-OXIDE PARTICLES; MAGNESIUM-OXIDE; CHEMICAL REAGENTS; SODIUM-NITRATE; CAPTURE; TEMPERATURE; CAPACITY; SIZE; MECHANISMS; DECOMPOSITION;
D O I
10.1126/sciadv.adg5690
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The development of effective CO2 sorbents is vital to achieving net-zero CO2 emission targets. MgO promoted with molten salts is an emerging class of CO2 sorbents. However, the structural features that govern their performance remain elusive. Using in situ time-resolved powder x-ray diffraction, we follow the structural dynamics of a model NaNO3-promoted, MgO-based CO2 sorbent. During the first few cycles of CO2 capture and release, the sorbent deactivates owing to an increase in the sizes of the MgO crystallites, reducing in turn the abundance of available nucleation points, i.e., MgO surface defects, for MgCO3 growth. After the third cycle, the sorbent shows a continuous reactivation, which is linked to the in situ formation of Na2Mg(CO3)(2) crystallites that act effectively as seeds for MgCO3 nucleation and growth. Na2Mg(CO3)(2) forms due to the partial decomposition of NaNO3 during regeneration at T >= 450 degrees C followed by carbonation in CO2.
引用
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页数:13
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