摘要
研究了在硫酸体系中贮氢合金电极电催化还原硝基苯合成对氨基苯酚(PAP),探讨了有机溶剂种类、反应温度、硫酸浓度等合成工艺条件对电解合成产率和电流效率的影响。阴极液中对氨基苯酚的含量直接用分光光度法测定。结果表明:贮氢合金电极可以电解还原硝基苯制备PAP;最佳电解工艺条件为:电解反应有机溶剂为异丙醇,电解时间4 h,反应温度80℃,电流密度0.2 A/cm2,硫酸浓度20%(体积分数);此条件下电解反应产率为58.6%,电流效率达78.5%。
Electrocatalysis synthesis of p-aminophenol（PAP） from nitrobenzene using hydrogen-storage alloy electrode as the catalytic reducer was studied in sulphuric acid system.The effects of technical conditions such as kinds of organic solvent,reaction temperature and sulphuric acid concentration on the yield of PAP and current efficiency were discussed.The PAP content in catholyte was determined directly by spectrophotometry.The results show that hydrogen-storage alloy electrode can electrolyze and reduce nitrobenzene to prepare PAP.And the optimal electrolysis conditions are as follows： Isopropanol is employed as the organic solvent,electrolysis time 4 h,reaction temperature 80 ℃,current density 200 mA/cm2,and sulphuric acid concentration 20%（volume fraction）.Under the optimal conditions the PAP yield is 58.6% and the current efficiency is up to 78.5%.
出处
《稀有金属与硬质合金》
CAS
CSCD
北大核心
2010年第4期33-36,共4页
Rare Metals and Cemented Carbides
关键词
硝基苯
对氨基苯酚
电催化合成
贮氢合金电极
nitrobenzene
p-aminophenol
electrocatalysis synthesis
hydrogen-storage alloy electrode
