摘要
利用静电纺丝和预氧化技术,制备了预氧化聚丙烯腈纤维膜负载SO42-/Ti O2固体酸催化剂,采用扫描电子显微镜(SEM)和能谱(SEM-EDS)、红外光谱(FT-IR)和X射线衍射光谱(XRD)对催化剂的结构和性能进行了表征。结果表明预氧化过程不会对催化剂的纤维结构产生影响,Ti元素也均匀分布在纤维上;预氧化过程使聚丙烯腈分子直链结构转变为共轭结构。该催化剂对缩醛酮反应的催化结果显示:预氧化聚丙烯腈纤维的共轭结构有利于提高SO42-/Ti O2固体酸的催化活性,催化缩醛酮反应的产率>87%,而且纤维膜结构方便了催化剂的回收和重复使用,该催化剂可以重复使用5次保持活性不变。
SO4 2-/TiO2 catalyst was firstly immobilized in preoxidated polyacrylonitrile by electrospinning and preoxidation. This no-vel catalyst was characterized by SEM,SEM-EDS,FT-IR and XRD. The results showed that the fiber structure was well kept after preoxidation and the Ti element was dispersed homogeneously in the fiber. Moreover, the polyacrylonitrile linear structure was changed into conjugate structure after preoxidation process. The catalytic performance of this fiber catalyst was evaluated by the ace-talization reactions. The results showed that the fiber catalyst was very efficient for the acetalization reaction with high yields （〉87%）. Moreover,the catalyst can be easily recovered and reused for five times without obvious loss of initial activity. The high ac-tivity and stability made the fiber solid acid hold great potential for the green chemical processes.
出处
《化学研究与应用》
CAS
CSCD
北大核心
2015年第5期595-599,共5页
Chemical Research and Application
基金
浙江省教育厅科技项目(Y201432680)
浙江省教育厅高职高专院校省级专业带头人领军项目(lj2013131)
校级高层次平台资助计划项目(111000210920713117)
