摘要
通过焙烧浸渍重构制得含Sn的镁铝层状双氢氧化物,经焙烧制得负载Sn的复合金属氧化物Sn/MgAl LDO,利用X射线衍射(XRD)、扫描电镜(SEM)、N2吸附-脱附等技术对其结构进行了表征。研究了其对苯乙烯环氧化制环氧苯乙烷反应的催化性能。考察了Sn含量、载体镁铝比例、焙烧温度对样品催化性能的影响,结果表明,当Sn掺杂量为2wt%,镁铝比为5∶1,焙烧温度为400℃时的Sn(2)/LDO(5)-400对苯乙烯环氧化制环氧苯乙烷具有比较好的催化活性。70℃,0.015 mol苯乙烯,0.075 mol 30wt%H2O2,20 mL乙腈,10 mL乙醇和3 g催化剂,反应6 h时,苯乙烯的转化率达到95.37%,环氧苯乙烷选择性达到97.23%,循环使用4次后催化剂对苯乙烯的转化率仍能达到91.26%,环氧苯乙烷选择性为94.89%。
Sn-doped Mg-Al layered double oxides were acquired by the calcination at 400 Tl of the corresponding Sn-doped Mg-Al hydrotalcite which was prepared by wetness impregnation.The structural information of Sn/LDO catalysts was characterized using XRD,SEM and nitrogen-adsorption/desorption techniques.Their catalytic activities were studied by epoxidation of styrene.The influences of the doping amount of Sn,mole ratio of Mg-Al and calcined temperature were investigated.The regeneration performance of catalysts was also studied.The results indicate that Sn loading of 2wt%,Mg:A1 of 5:1,calcined at 400℃,Sn(2)/LDO(5)^KX)shows much a higher activity in synthesis of styrene epoxide.Under the reaction conditions with 0.015 mol styrene,0.075 mol 30wt%H20 2,20 mL acetonitrile,10 mL ethanol,3 g catalyst,reacting at 70℃for 6 h,the conversion of styrene is 95.3 7%,the selectivity to styrene epoxide can reach 97.23%.In a set of reuse experiments,there is almost no reduction of the catalytic activity.
作者
刘媛
李树白
姚培
张启蒙
孟鑫
刘宇
孔霞
LIU Yuan;LI Shu-bai;YA0 Pei;ZHANG Qi-meng;MENG Xin;LIU Yu;K0NG Xia(Department of Chemical and Materials Engineering,Changzhou Vocational Institute of Engineering,Changzhou 213164,China;Green Chemical Research Institute,Changzhou Vocational Institute of Engineering,Changzhou 213164,China)
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2018年第8期2423-2427,共5页
Bulletin of the Chinese Ceramic Society
基金
江苏省高校自然科学基金(16KJB530005)
2016年度江苏高校"青蓝工程"科技创新团队项目
江苏高校品牌建设工程资助项目应用化工技术专业(PPZY2015B178)
江苏省2016年度大学生创新创业训练计划项目部分成果(201613102009Y)
2016年度校级科研基金(11130100116006)
2017年江苏省高职院校教师专业带头人高端研修计划项目(团队)(2017TDFX001)
