电化学直接合成已醇铌研究

Electrochemical Synthesis of Niobium Ethoxide

采用电化学方法用金属铌直接合成了乙醇铌,用拉曼光谱,红外光谱和元素分析对产品进行了表征。结果表明:乙醇含水量对槽电压及阳极的溶解行为有显著的影响:随着含水量的增加,恒流电解所需的起始电压迅速增大,且电解过程中槽电压升高的速度和幅度越大。在经除水处理的乙醇中,铌阳极呈现层片状的均匀腐蚀,这种特征不随槽电压和电解时间的变化而改变;在未经除水的乙醇中,槽电压低时,阳极呈现点蚀的特点,槽电压高时,阳极腐蚀呈现均匀腐蚀。研究表明:电化学合成乙醇铌的关键是要设法除去乙醇中少量的水分。

Niobium ethoxides directly prepared by electrochemical method using metal niobium were characterized by Raman spectra, FT-IR spectra and element analysis. The effect of residual moisture in ethanol on the cell voltage and the dissolution manner of niobium anode were investigated by experiments. When the current was constant, with adding of moisture, the start cell voltage enhanced observably, and continued to increase in the electrolysis process. In the dewatered ethanol, general corrosion on the anode took place and developed, independent of the cell voltage and time. When commercial ethanol was directly used, pitting corrosion occurred on the anode at lower cell voltage and general corrosion appeared at higher voltage. Results showed elimination of moisture in the ethanol is very important in the electrochemical synthesis of niobium ethoxide.