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In situ Raman and XRD study of CO2 sorption and desorption in air by a Na4SiO4-Na2CO3 hybrid sorbent
Wang, ZR; Liu, WH; Tang, ZF; Xu, Q
2020
Source PublicationPHYSICAL CHEMISTRY CHEMICAL PHYSICS
ISSN1463-9076
Volume22Issue:46Pages:27263-27271
Subtype期刊论文
AbstractSilicate-carbonate mixtures as new CO2 capture agents have the latent application potential. CO2 sorption or desorption processes using the Na4SiO4-Na2CO3 mixture sorbent in air were analyzed by in situ Raman spectroscopy and X-ray diffraction from 25 degrees C to 900 degrees C. The results show that the Na4SiO4-Na2CO3 mixture sorbent could continuously absorb and strip CO2 by thermal swinging. The CO2 sorption was produced via a two-step process depending on the temperature range. Initially, CO2 dissolved in carbonate to produce pyrocarbonate (C2O52-) ions, which subsequently reacted with SiO44- anion to produce the polymer silicates and CO32- anion. The C2O52- anion on the surface of the silicates promoted CO2 transformation to CO32- anion through the reaction with SiO44- anions. The CO32- anion decomposed the polymer silicates to produce orthosilicates and CO2 gas again at high temperature. By this circulation, CO2 could dissolve in carbonate more easily and be absorbed and stripped continuously by thermal swinging in the mixture sorbent than the pure carbonate. The processes of recovering heat and separating CO2 from flue gas simultaneously without decreasing the temperature is an economical and attractive method for energy conservation. It offers the theoretical basis for developing new heat-storage and CO2-capture technology.
KeywordSILICATE-GLASSES REACTION-MECHANISM LITHIUM SILICATE CAPTURE CARBON SPECTROSCOPY TEMPERATURE LI4SIO4 SPECTRA IDENTIFICATION
DOI10.1039/d0cp04335d
Indexed BySCI ; EI
Language英语
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Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/32928
Collection中科院上海应用物理研究所2011-2020年
Affiliation1.Chinese Acad Sci, Shanghai Inst Appl Phys, POB 800-204, Shanghai 201800, Peoples R China
2.Chinese Acad Sci, Key Lab Interfacial Phys & Technol, Shanghai 201800, Peoples R China
3.Shanghai Univ, State Key Lab Adv Special Steel, Shanghai Key Lab Adv Ferromet, Sch Mat Sci & Engn, Shanghai 200444, Peoples R China
Recommended Citation
GB/T 7714
Wang, ZR,Liu, WH,Tang, ZF,et al. In situ Raman and XRD study of CO2 sorption and desorption in air by a Na4SiO4-Na2CO3 hybrid sorbent[J]. PHYSICAL CHEMISTRY CHEMICAL PHYSICS,2020,22(46):27263-27271.
APA Wang, ZR,Liu, WH,Tang, ZF,&Xu, Q.(2020).In situ Raman and XRD study of CO2 sorption and desorption in air by a Na4SiO4-Na2CO3 hybrid sorbent.PHYSICAL CHEMISTRY CHEMICAL PHYSICS,22(46),27263-27271.
MLA Wang, ZR,et al."In situ Raman and XRD study of CO2 sorption and desorption in air by a Na4SiO4-Na2CO3 hybrid sorbent".PHYSICAL CHEMISTRY CHEMICAL PHYSICS 22.46(2020):27263-27271.
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