Tailored design of high–stability CoMn1.5Ox@TiO2 double–wall nanocages derived from Prussian blue analogue for catalytic combustion of o–dichlorobenzene

Abstract

Double–wall nanocages of CoMn1.5Ox@TiO2 were constructed via annealing Mn3[Co(CN)6]2·nH2O@TiO2 core–shell structure, which were evaluated for the catalytic combustion reaction of o–dichlorobenzene (o–DCB). The size of Mn3[Co(CN)6]2·nH2O nanocubes was adjusted by controlling the amount of PVP and the thickness of TiO2 shell was regulated by the Ti content. The specific surface area, acid and redox properties, catalytic activity and stability of CoMn oxide catalysts were greatly improved by establishing chainmail catalyst of CoMn1.5Ox@TiO2 double–wall nanocages. The CoMn600@0.5Ti exhibited the optimum destruction activity of o–DCB with T50 of 341 ○C and T90 of 392 ○C because of the thickness effect of TiO2 shell and synergistic effect between CoMn1.5Ox and TiO2. CoMn600@1.0Ti with 79 nm thickness of TiO2 shell exhibited durable stability in 1500 min due to the chainmail protective role of TiO2 shell on CoMn1.5Ox core. A possible reaction mechanism involving MvK and L–H model was proposed according to the active oxygen source based on TPSR-MS, in–situ FTIR, and catalytic performance studies.