引用本文:
【打印本页】   【HTML】   【下载PDF全文】   View/Add Comment  【EndNote】   【RefMan】   【BibTex】
←前一篇|后一篇→ 过刊浏览    高级检索
本文已被:浏览 186次   下载 81 本文二维码信息
码上扫一扫!
分享到: 微信 更多
Identification of Superoxide O2- during Thermal Decomposition of Molten KNO3-NaNO2-NaNO3 Salt by Electron Paramagnetic Resonance and UV-Vis Absorption Spectroscopy
Shu-ting Liu,Tao Su,Peng Zhang,Ze-jie Fei,Hong-tao Liu*
Author NameAffiliationE-mail
Shu-ting Liu Department of Molten Salt Chemistry and Engineering, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China  
Tao Su Department of Molten Salt Chemistry and Engineering, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China  
Peng Zhang Department of Molten Salt Chemistry and Engineering, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China  
Ze-jie Fei Department of Molten Salt Chemistry and Engineering, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China  
Hong-tao Liu* Department of Molten Salt Chemistry and Engineering, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China liuhongtao@sinap.ac.cn 
Abstract:
On 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 O22- and O2- 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 UVVis 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.
Key words:  Superoxide  Decomposition of heat transfer salt  High temperature UV-visible  Electron paramagnetic resonance
FundProject:This work was supported by the "Strategic Priority Research Program,TMSR" of the Chinese Academy of Sciences (No.XD02002400),the National Natural Science Foundation of China (No.51506214),the Hundred Talents Program,CAS and Shanghai Pujiang Program.
利用电子顺磁共振和紫外/可见吸收光谱研究熔融KNO3-NaNO2-NaNO3盐分解过程中的超氧负离子
刘舒婷,苏涛,张鹏,费泽杰,刘洪涛*
摘要:
关键词:  
DOI:10.1063/1674-0068/30/cjcp1703046
分类号: