【摘要】 采用室温固相法制备了具有Keggin结构的杂多酸铯盐催化剂(CsxH3+n-xPMo12-nVnO40,n=0,1,2,x=0.5～3.0).红外、X射线粉末衍射及循环伏安技术研究显示,钒取代钼原子可提高催化剂的氧化还原性,铯取代数的增加可提高催化剂的疏水性但降低氧化还原性.在H2O2为氧化剂的苯羟基化反应中,随着铯取代数目的增加,催化剂的溶脱情况得到明显改善.在氧化还原性和疏水性协同作用下,Cs2H3PMo10V2O40在CsxH3+n-xPMo12-nVnO40系列催化剂中显示出相对最佳的苯羟基化催化活性(苯酚收率19.2%)和重复使用性能.更多还原

【Abstract】 Three series of cesium salts of Keggin-type heteropoly acids(CsxH3+n-xPMo12-nVnO40,n=0,1,2,x=0.5～3.0) prepared by a solid synthesis method have been employed in the catalytic hydroxylation of benzene to phenol with H2O2.The effects of vanadium substitution number and cesium content on the catalytic activity,redox ability and hydrophobicity of the catalysts were studied.Cs2H3PMo10V2O40 exhibits high phenol yield(19.2%) and good reusability among the CsxH3+n-xPMo12-nVnO40catalysts.更多还原