Copper-cobalt Bimetallic Oxides-doped Alumina Hollow Spheres:a Highly Efficient Catalyst for Epoxidation of Styrene

• 来源期刊: 高等学校化学研究（英文版）
• 年，卷（期）: 2019,（1）
• 页码范围: 125-132
• 页数: 8页
• 语种: 英文
• DOI: 10.1007/s40242-018-8158-2

摘要

Copper-cobalt bimetallic oxides-doped alumina hollow spheres(CuCo/AHS) were fabricated through the sacrificial carbonaceous template strategy.The dependence of the physicochemical properties and morphologies of CuCo/AHS on the composition of copper and cobalt in Cu.xCoy/AHS(x/y=9/1,7/3,5/5,and 3/7) was characterized by means of X-ray powder diffraction,nitrogen physisorption,atomic adsorption spectroscopy,scanning electron microscopy,transmission electron microscopy and X-ray photoelectron spectroscopy.Among these catalysts,Cu7Co3/AHS catalyst exhibited perfect hollow sphere structure,thin wall,and big pore size.The calcined catalysts were examined for the epoxidation of styrene with tert-butyl hydroperoxide as oxidant.Compared with the monometallic counterparts(Cu/AHS and Co/AHS) and other CuxCoy/AHS catalysts,Cu7Co3/AHS catalyst showed higher performance,yielding a styrene conversion of 64.6％ with 93.0％ selectivity toward styrene oxide.In addition,the strong interaction of Cu2+ or Co2+ with AHS ensured good stability after four consecutive reactions.