CAJ | 학술논문

采用简单浸渍和液相还原法制备了Ag/KOH-γ-Fe2O3催化剂,并采用X射线衍射、透射电镜和X射线光电子能谱等方法对催化剂进行了表征.结果表明,在乙酸乙酯介质中,以叔丁基过氧化氢为氧化剂,该催化剂具有较高的催化苯乙烯环氧化活性,KOH的添加可大幅度提高环氧化反应活性和选择性.表征结果显示,反应前后催化剂性质没有发生明显的变化.另外,所使用的磁性载体有利于负载型银催化剂的分离和循环利用.
채용간단침지화액상환원법제비료Ag/KOH-γ-Fe2O3최화제,병채용X사선연사、투사전경화X사선광전자능보등방법대최화제진행료표정.결과표명,재을산을지개질중,이숙정기과양화경위양화제,해최화제구유교고적최화분을희배양화활성,KOH적첨가가대폭도제고배양화반응활성화선택성.표정결과현시,반응전후최화제성질몰유발생명현적변화.령외,소사용적자성재체유리우부재형은최화제적분리화순배이용.
The supported silver catalyst Ag/KOH-γ-Fe2O3 was prepared by simple impregnation and liquid reduction and then structurally characterized by X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy. The supported silver catalysts were highly efficient for the epoxidation of styrene using tert-butyl hydroperoxide as the oxidant and ethyl acetate as the reaction medium.The addition of KOH was found to increase the catalytic activity and selectivity significantly. Additionally, the magnetically recoverable γ-Fe2O3, as a support, allowed for an easy separation and recycling of the catalyst after the reaction.