In order to improve the inefficiency of volatile organic compound(VOCs)combustion processing,Cr2O3 nano-particles were prepared by using a hydrothermal synthesis method and subsequently used as carrier to load manganese through impregnation method,leading to the development of a series of Mn/Cr2O3 catalysts.The physical and chemical properties of the catalysts were characterized,and the catalytic oxidation performance for toluene was evaluated.The corresponding results indicated that the introduction of MnOx onto Cr2O3 not only instigated the creation of an organized mesoporous structure within the chromium-based support,but also markedly increased the specific surface area.This enhancement facilitated the dispersion of active MnOx,maintained the stable structure of Mn/Cr2O3 catalysts,and resolved the issue of aggregation-induced deactivation of the active components.When Mn content was 20％,Mn/Cr2O3 catalyst exhibited the highest activity,and the temperatures for the toluene conversion reaching 50％,90％and 100％,were 210,229 and 240 ℃,respectively.Moreover,the toluene conversion could be maintained at 100％at 240 ℃ in 50 h stability test.The results demonstrated that by controlling the amount of Mn species incorporated,it was possible to effectively modulate the pore structure of the Mn/Cr2O3 catalysts,the interactions between the metal and support and the ability to eliminate coke deposition.
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