以Ce^3＋/Ce^4＋为媒质间接电合成1,4-萘醌  

Indirect electrochemical synthesis of 1,4-naphthoquinone mediated by Ce^(3+)/Ce^(4+)

作　　者：李照华[1] 褚有群[1] 马淳安[1] 

机构地区：[1]浙江工业大学化学工程与材料学院,绿色化学合成技术国家重点实验室培育基地,浙江杭州310032

出　　处：《化工学报》2013年第1期334-339,共6页CIESC Journal

基　　金：国家重点基础研究发展计划项目(2012CB722604);浙江省自然科学基金项目(LY12B03004);浙江省研究生教育创新示范基地基金项目(1001)~~

摘　　要：探讨了以Ce3+/Ce4+为媒质的1,4-萘醌间接电化学合成反应。考察了液相氧化、Ce3+电解氧化过程的影响因素,并进行了萘醌的间接电合成实验。结果发现,硫酸浓度、溶液温度对铈离子的氧化能力和电化学反应活性具有重要的影响;当温度为70℃、硫酸浓度为1.0mol.L-1时,液相氧化反应的收率最高(85.8%)。Ce3+电解氧化的最优条件为:电流密度50mA.cm-2、硫酸浓度1.0mol.L-1、温度为50℃,其电流效率可达90.6%;间接电合成实验过程中萘醌的平均收率达85.7%,Ce3+电解氧化的平均电流效率达87.8%,并且电解过程具有良好的稳定性,表明该技术具有良好的产业化应用前景。Indirect electrochemical synthesis of 1,4-naphthoquinone was studied by using Ce3＋/Ce4＋ as mediator.The influence factors related to the processes of liquid phase oxidation of naphthalene and electrochemical oxidation of Ce3＋ were investigated,and indirect electrochemical synthesis of 1,4-naphthoquinone was also conducted.The experimental results showed that concentrations of H2SO4 and solution temperature had significant influence on oxidative ability and electrochemical reactivity of cerium ions.The highest yield of 1,4-naphthoquinone（85.8%）could be obtained during liquid phase oxidation in 1.0 mol·L-1 H2SO4 at 70℃.The current efficiency of electrochemical oxidation of Ce3＋ could reach up to 90.6% with current density of 50 mA·cm-2 in 1.0 mol·L-1 H2SO4 at 50℃.Excellent results were achieved during indirect electrochemical synthesis of 1,4-naphthoquinone.The tests were cycled for six times,and average yield of 1,4-naphthoquinone and current efficiency of electrochemical oxidation of Ce3＋ were 85.7% and 87.8% respectively.These indicated that this technology could have a good prospect of commercialization.

关 键 词：萘醌 间接电合成 媒质 铈离子 

分 类 号：TQ15[化学工程—电化学工业]