东北大学学报(自然科学版) ›› 2024, Vol. 45 ›› Issue (3): 331-336.DOI: 10.12068/j.issn.1005-3026.2024.03.004

• 材料与冶金 • 上一篇    下一篇

Na2CO3-K2CO3-NaVO3熔盐结构的拉曼光谱和理论计算

张一帆1,2, 胡宪伟1,2(), 于江玉1,2, 王兆文1,2   

  1. 1.东北大学 冶金学院,辽宁 沈阳 110819
    2.东北大学 多金属共生矿生态化冶金教育部重点实验室,辽宁 沈阳 110819
  • 收稿日期:2022-10-26 出版日期:2024-03-15 发布日期:2024-05-17
  • 通讯作者: 胡宪伟
  • 作者简介:张一帆(1991-),男,山东日照人,东北大学博士研究生
    王兆文(1964-),男,辽宁沈阳人,东北大学教授,博士生导师.
  • 基金资助:
    国家自然科学基金资助项目(51974081);中央高校基本科研业务费专项资金资助项目(N2225045);山东魏桥创业集团有限公司-教育部产学合作协同育人项目(2021021800102)

Raman Spectroscopy and Theoretical Calculation on Structure of Na2CO3-K2CO3-NaVO3 Molten Salts

Yi-fan ZHANG1,2, Xian-wei HU1,2(), Jiang-yu YU1,2, Zhao-wen WANG1,2   

  1. 1.School of Metallurgy,Northeastern University,Shenyang 110819,China
    2.Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education),Northeastern University,Shenyang 110819,China. cn
  • Received:2022-10-26 Online:2024-03-15 Published:2024-05-17
  • Contact: Xian-wei HU
  • About author:HU Xian-wei,E-mail:huxw@smm.neu.edu.cn

摘要:

NaVO3在Na2CO3-K2CO3熔盐体系中可原位催化电还原CO2制备高附加值碳材料,对Na2CO3-K2CO3-NaVO3体系熔盐结构进行研究有助于明晰电极过程机理和优化反应条件.本文采用拉曼光谱学和量子化学计算(基于Gaussian和Molclus程序)相结合的方法探究了1 073 K下Na2CO3-K2CO3-NaVO3熔盐体系的离子结构.结果表明,在该熔盐体系中,除了存在CO32-以外,还存在由CO32-和VO3-发生反应生成的VO43-,而不存在VO3-;VO43-所属C1空间点群,其中V—O键的对称伸缩振动模对应的拉曼特征峰位于802 cm-1处;随着体系中NaVO3质量分数由5%增加至15%,熔盐中VO43-的相对含量急剧增加,而CO32-的相对含量相应地减少.

关键词: NaVO3, Na2CO3-K2CO3熔盐, 拉曼光谱, 量子化学计算, VO43-

Abstract:

In the molten Na2CO3‐K2CO3, NaVO3 can catalyze the in‐situ electroreduction of CO2 to prepare high value‐added carbon‐based products. Studying the molten salt structure of Na2CO3‐K2CO3‐NaVO3 system contributes to understand the electrode process mechanism and optimize the reaction conditions.The ionic structure of Na2CO3‐K2CO3‐NaVO3 molten salt system at 1 073 K was investigated by a combination of Raman spectroscopy and quantum chemistry calculation using Gaussian and Molclus programs. The results show that VO43- generated by the reaction of CO32- and VO3- exists in the melts, apart from the presence of CO32-, but VO3- doesn’t exist. VO43- belongs to C1 point group symmetry, and the band located at 802 cm-1 in the Raman spectrum is caused by the symmetrical stretching vibration of the V—O bond in VO43-. As the mass fraction of NaVO3 in the system increases from 5% to 15%, the relative content of VO43- increases dramatically, while that of CO32- decreases accordingly in the molten salts.

Key words: NaVO3, Na2CO3‐K2CO3 molten salt, Raman spectroscopy, quantum chemistry calculation, VO43-

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