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Identification of Superoxide O-2(-) during Thermal Decomposition of Molten KNO3-NaNO2-NaNO3 Salt by Electron Paramagnetic Resonance and UV-Vis Absorption Spectroscopy
Liu, ST; Su, T; Zhang, P; Fei, ZJ; Liu, HT
2017
Source PublicationCHINESE JOURNAL OF CHEMICAL PHYSICS
ISSN1674-0068
Volume30Issue:4Pages:372-378
Subtype期刊论文
AbstractOn account of excellent thermal physical properties, molten nitrates/nitrites salt has been widely employed in heat transfer and thermal storage industry, especially in concentrated solar power system. The thermal stability study of molten nitrate/nitrite salt is of great importance for this system, and the decomposition mechanism is the most complicated part of it. The oxide species O-2(2-) and O-2(-) were considered as intermediates in molten KNO3-NaNO3 while hard to been detected in high temperature molten salt due to their trace concentration and low stability. In this work, the homemade in situ high temperature UV-Vis instrument and a commercial electron paramagnetic resonance were utilized to supply evidence for the formation of superoxide during a slow decomposition process of heat transfer salt (HTS, 53 wt% KNO3/40 wt% NaNO2/7 wt% NaNO3). It is found that the superoxide is more easily generated from molten NaNO2 compared to NaNO3, and it has an absorption band at 420-440 nm in HTS which red shifts as temperature increases. The band is assigned to charge-transfer transition in NaO2 or KO2, responsible for the yellow color of the molten nitrate/nitrite salt. Furthermore, the UV absorption bands of molten NaNO2 and NaNO3 are also obtained and compared with that of HTS.
KeywordSolar Power-plants Energy Storage Potassium-nitrate Fused-salts Spectra Matrix Chemistry Oxygen O2 Molecules
DOI10.1063/1674-0068/30/cjcp1703046
Indexed BySCI
WOS KeywordSOLAR POWER-PLANTS ; ENERGY STORAGE ; POTASSIUM-NITRATE ; FUSED-SALTS ; SPECTRA ; MATRIX ; CHEMISTRY ; OXYGEN ; O2 ; MOLECULES
Language英语
WOS IDWOS:000410748500002
Citation statistics
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/28687
Collection中科院上海应用物理研究所2011-2019年
Recommended Citation
GB/T 7714
Liu, ST,Su, T,Zhang, P,et al. Identification of Superoxide O-2(-) during Thermal Decomposition of Molten KNO3-NaNO2-NaNO3 Salt by Electron Paramagnetic Resonance and UV-Vis Absorption Spectroscopy[J]. CHINESE JOURNAL OF CHEMICAL PHYSICS,2017,30(4):372-378.
APA Liu, ST,Su, T,Zhang, P,Fei, ZJ,&Liu, HT.(2017).Identification of Superoxide O-2(-) during Thermal Decomposition of Molten KNO3-NaNO2-NaNO3 Salt by Electron Paramagnetic Resonance and UV-Vis Absorption Spectroscopy.CHINESE JOURNAL OF CHEMICAL PHYSICS,30(4),372-378.
MLA Liu, ST,et al."Identification of Superoxide O-2(-) during Thermal Decomposition of Molten KNO3-NaNO2-NaNO3 Salt by Electron Paramagnetic Resonance and UV-Vis Absorption Spectroscopy".CHINESE JOURNAL OF CHEMICAL PHYSICS 30.4(2017):372-378.
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