CAJ | 학술논문

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-/TiO2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-/TiO2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。
이용정전방사화예양화기술,제비료예양화취병희정섬유막부재SO42-/TiO2고체산최화제,채용소묘전자현미경( SEM)화능보( SEM-EDS)、홍외광보( FT-IR)화X사선연사광보( XRD)대최화제적결구화성능진행료표정。결과표명예양화과정불회대최화제적섬유결구산생영향,Ti원소야균균분포재섬유상；예양화과정사취병희정분자직련결구전변위공액결구。해최화제대축철동반응적최화결과현시：예양화취병희정섬유적공액결구유리우제고SO42-/TiO2고체산적최화활성,최화축철동반응적산솔>87%,이차섬유막결구방편료최화제적회수화중복사용,해최화제가이중복사용5차보지활성불변。
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.