Solvent-free oxidation of ethylbenzene over hierarchical flower-like core–shell structured Co-based mixed metal oxides with significantly enhanced catalytic performance

摘要: Herein, we reported the development of new and cost-effective cobalt-based metal oxide catalysts for oxidation ethylbenzene, which is considered to be much importance production high value-added raw materials. The heterogeneous Co-based catalyst system, hierarchical flower-like core–shell structured Co–Zn–Al mixed oxides supported on alumina (CoZnAl-MMO/Al2O3), was reproducibly prepared by a two-step process, involved in situ growth two-dimensional layered double hydroxide precursor amorphous microspheres followed calcination. materials were characterized XRD, SEM, TEM, HRTEM, TPR, XPS nitrogen adsorption–desorption measurement. results revealed that CoZnAl-MMO/Al2O3 exhibited dispersion cobalt species due well-developed three-dimensional CoZnAl-MMO platelets as well separating effect resulting ZnO phase. As-synthesized studied ethylbenzene without addition any solvent additive using tert-butyl hydroperoxide oxygen source showed higher catalytic activity selectivity acetophenone compared with conventional incipient impregnation. Furthermore, such possessed stability could reused at least three times remarkable loss activity.