摘要
以表面活性剂十六烷基三甲基溴化铵(CTAB)和十二烷基硫酸钠(SDS)改性的碳纳米管为载体,制备了TiO2/CNT催化剂,用于苯酚与碳酸二甲酯酯交换合成碳酸二苯酯的反应.采用X射线衍射(XRD)、扫描电镜(SEM)和透射电镜(TEM)对改性前后催化剂的结构和形貌进行了表征,显示出负载后的催化剂中活性组分二氧化钛以无定形态存在.ICP分析证实修饰过的碳纳米管能负载上更多的活性组分.研究了不同表面活性剂的影响,活性测试结果表明,以CTAB修饰的碳纳米管为载体时,载体与活性组分之间通过静电吸引作用相联接,催化剂显示更好的活性和稳定性.
Carbon nanotubes（CNT） were modified by cetyltrimethylammonium bromide（CTAB） and so-dium dodecyl sulfate（SDS）,and used to prepare catalyst TiO2/CNT.The catalytic activity of TiO2/CNT was tested by the transesterification between phenol and dimethyl carbonate（DMC）.The catalysts were charac-terized by X-ray diffraction,SEM and TEM.The results showed crystalline TiO2 were not yet formed,while amorphous was favorable to the transesterification.ICP results approved that more active species were loaded on CNT modified by surfactant.Furthermore,influence of the sort of surfactant on catalytic activity was studied,and the result showed that cationic surfactant was suited to TiO2/CNT for the transesterification between phenol and DMC.TiO2/CNT-C catalyst had a preferable reuse due to the electrostatic interaction between active species TiO2 and support CNT-C.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2011年第19期2328-2334,共7页
Acta Chimica Sinica
基金
中国科学院2007"西部之光"联合学者项目
