Abstract
The practicable mesoporous γ-Al2O3-supported manganese–cerium mixed oxides (Mn-CeOx/γ-Al2O3) catalysts were prepared in large quantities by a facile impregnation–calcination method. Characterization results demonstrated that the Mn-CeOx/γ-Al2O3 catalyst retained the mesoporous structure of γ-Al2O3 and existed in multivalence redox couples of Mn4+/3+ and Ce4+/3+. The surface property, catalytic performance, reaction kinetics, and mechanism of γ-Al2O3 and Mn-CeOx/γ-Al2O3 in catalytic ozonation of bromaminic acid (BAA) were investigated in-detail. The protonated surface hydroxyl groups S–OH2+ on Mn-CeOx/γ-Al2O3 were the active sites for ozone decomposition, and HO• and O2•– were main reactive oxygen species. The multivalence redox couples of Mn3+/4+ and Ce3+/4+, along with electron transfer between these redox couples and lattice oxygen, resulted in the synergistically catalytic effect between Mn and Ce in Mn-CeOx. A catalytic ozonation mechanism over Mn-CeOx/γ-Al2O3 was tentatively proposed. The pilot-scale...
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