Mechanism of the Green Cosolvent Triethylene Glycol on the Process of Electrochemical Oxidation of Acetylene
SONG Xiu-li1,2, YANG Hui-min1, LIU Xian1, JIAN Xuan1, LIANG Zhen-hai1*
1. College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
2. Department of Chemistry, Taiyuan Normal University, Taiyuan 030031, China
Abstract：A new view to determine concentration of dissolved acetylene in ambient temperature and pressure was put forward, and solubility of acetylene in different solvents was investigated by UV-Vis. (UV-Vis spectrophotometry). Influence of cosolvents such as acetone, TEG (triethylene glycol), DMSO (dimethyl sulfoxide), DMF (N,N-dimethyl formamide) especially the green cosolvent of TEG and its mechanism and volume fraction, temperature and scan rate on the process of electrochemical oxidation of acetylene at Pt electrode were examined by CV (cyclic voltammetry). The analysis results show that the concentration of dissolved acetylene can be determined accurately through claret-colored copper acetylide by UV-Vis. (at 542 nm), the solubility order of acetylene in different solvents is DMF>DMSO>TEG>acetone, the hydrogen bonding interactions were identified as the main interaction controlling the mutual solubility of the H2O in Na2SO4 solution and TEG in the system, and when the supporting electrolyte is 0.5 mol·L-1 Na2SO4 with TEG (vol.9%), the dissolved acetylene can be the most easily oxidized by OH· from the electrolysis process of Na2SO4 solution and the ipa (anodic peak current) is maximum, the process of electrochemical oxidation of acetylene at Pd electrode is under adsorption control and irreversible, the Ea (apparent activation energy) of the process of electrochemical oxidation of acetylene at Pd electrode is 13.20 kJ·mol-1. This study expects to seek a kind of good solvent acetylene and provides theoretical basis and experimental guidance to the research of electrochemical oxidation acetylene process and the development of sensor for acetylene (especially electrochemical sensor for acetylene), green chemistry and acetylene chemical industry.
基金资助: the National Natural Science Foundation of China and the Shenhua Group Corporation Limited (U1261103), and the Open Fund of State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences(J12-13-913)
作者简介: SONG Xiu-li，(1973—)，female, a doctor in College of Chemistry and Chemical Engineering, Taiyuan University of Technology e-mail:
songxiuli725@126.com
引用本文:
宋秀丽，杨慧敏，刘 宪，简 选，梁镇海. 绿色助溶剂三乙二醇在乙炔电化学氧化过程中的作用机制[J]. 光谱学与光谱分析, 2017, 37(08): 2645-2651.
SONG Xiu-li, YANG Hui-min, LIU Xian, JIAN Xuan, LIANG Zhen-hai. Mechanism of the Green Cosolvent Triethylene Glycol on the Process of Electrochemical Oxidation of Acetylene. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2017, 37(08): 2645-2651.
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