LaOx modified MnOx loaded biomass activated carbon and its enhanced performance for simultaneous abatement of NO and Hg0

A battery of agricultural straw derived biomass activated carbons supported LaOx modified MnOx (LaMn/BACs) was prepared by a facile impregnation method and then tested for simultaneous abatement of NO and Hg-0. 15%LaMn/BAC manifested excellent removal efficiency of Hg-0 (100%) and NO (86.7%) at 180 degrees C, which also exhibited splendid resistance to SO2 and H2O. The interaction between Hg-0 removal and NO removal was explored; thereinto, Hg0 removal had no influence on NO removal, while NO removal preponderated over Hg-0 removal. The inhibitory effect of NH3 was greater than the accelerative effect of NO and O-2 on Hg-0 removal. The physicochemical characterization of related samples was characterized by SEM, XRD, BET, H-2-TPR, NH3-TPD, and XPS. After incorporating suitable LaOx into 15%Mn/BAC, the synergistic effect between LaOx and MnOx contributed to the improvement of BET surface area and total pore volume, the promotion of redox ability, surface active oxygen species, and acid sites, inhibiting the crystallization of MnOx. 15%LaMn/BAC has the best catalytic oxidation activity at low temperature. That might be answerable for superior performance and preferable tolerance to SO2 and H2O. The results indicated that 15%LaMn/BAC was a promising catalyst for simultaneous abatement of Hg-0 and NO at low temperature.

Automated summary

A battery of LaOx modified MnOx activated carbon catalysts were prepared for simultaneous abatement of NO and Hg-0, with 15%LaMn/BAC exhibiting excellent removal efficiency at 180 degrees C. The inhibitory effect of NH3 on Hg-0 removal was found to be greater than the accelerative effect of NO and O-2.