Enhancement effect of Mn doping on Co3O4 derived from Co-MOF for toluene catalytic oxidation

The design of Co-Mn composite oxides catalysts derived from MOF is significant for catalytic combustion of toluene.Here,a series of M-CoaMnfbOx,with enhanced catalytic properties compared with that of MCo3O4,were successfully prepared through pyrolysis of Mn-doped Co-MOF.The as-synthesized MCo1Mn1Ox(Co:Mn=1:1) exhibits an optimal catalytic activity with 90% toluene conversion reached at227℃,which benefits from the increase of Co3+,Oadsand the synergistic effect between Mn and Co.According to the analysis of the in situ diffuse reflectance infrared Fourier transform spectroscopy,toluene could be degraded easier on M-Co1Mn1Oxwith lower activation energy than M-Co3O4.The main intermediate products are benzaldehyde,benzoic acid,anhydride,and maleate species.Those findings reveal the value of Mn doping for improved activity of toluene oxidation on MOF derived Co3O4,which provide a feasible method for the construction of toluene-oxidation catalysts.