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7001577 
Journal Article 
MoO3-adjusted delta-MnO2 nanosheet for catalytic oxidation of Hg-0 to Hg2+ 
Zhao, H; Ezeh, CI; Yin, S; Xie, Z; Pang, CH; Zheng, C; Gao, X; Wu, Tao; , 
2020 
Yes 
Applied Catalysis B: Environmental
ISSN: 0926-3373 
ELSEVIER 
AMSTERDAM 
263 
WOS:000510526000032 
The challenge of Hg-0 emission control has necessitated the development of catalytic oxidation technology. Herein, a combination of experimental and computational approach to explore the potential over Mo-Mn catalysts was conducted. Series of catalysts were synthesized and characterized with varying Mn and Mo loading (1-10%). Among the various compositions, 1.25Mo2 Mn catalyst exhibited the best Hg-0 removal performance with Hg(0 )removal efficiency > 98% (oxidation ratio > 50%, and better stability over 10 h period at 250 degrees C). Most importantly, the synergistic interaction between MoO3 and defective delta-MnO2 nanosheet was promoted by the adjusted activation energy, bond strength, Bronsted acidic sites and defects, which facilitated the catalytic oxidation of Hg-0 to Hg2+. Furthermore, DFT calculations suggested that the role of Mo enabled the reduction in the energy barrier for the desorption step, which was defined as the rate-determining step for catalytic oxidation of Hg-0 on Mn-based catalyst. 
Hg-0 catalytic oxidation; Molybdenum-manganese catalyst; Synergistic effect; Defect surface; DFT