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.
出处
《化工学报》
EI
CAS
CSCD
北大核心
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)~~
关键词
萘醌
间接电合成
媒质
铈离子
naphthoquinone
indirect electrochemical synthesis
medium
cerium
