Catalytic oxidation of Hg0 to HgO is an efficient way to remove Hg0 from coal-fired flue gas.The catalyst with ordered pore structure can lower mass transfer resistance resulting in higher Hg0 oxidation effi-ciency.Therefore,in the present work,wood vessels were used as sacrificial template to obtain Co3O4 with ordered pore structure.SEM and BET results show that,when the mass concentrations of Co(NO3)2·6H2O was 20％,the obtained catalyst(Co3O4[20％Co(NO3)2])possesses better pore structure and higher surface area.It will expose more available surface active sites and lower the mass transfer resis-tance.Furthermore,XPS results prove that Co3O4[20％Co(NO3)2]has the highest ratio of chemisorbed oxygen which plays an important role in Hg0 oxidation process.These results lead to a better Hg0 oxida-tion efficiency of Co3O4[20％Co(NO3)2],which is about 90％in the temperature range of 200 to 350℃.Furthermore,Co3O4[20％Co(NO3)2]has a stable catalytic activity,and its Hg0 oxidation efficiency main-tains above 90％at 250℃even after 90 h test.A probable reaction mechanism is deduced by the XPS results of the fresh,used and regenerated catalyst of Co3O4[20％Co(NO3)2].Chemisorbed oxygen can react with Hg0 forming HgO with the reduction of Co3+to Co2+.And lattice oxygen and gaseous oxygen can sup-plement the consumption of chemisorbed oxygen to oxidize Co2+to Co3+.

Xiaopeng Zhang;Cheng Gao;Ziwei Wang;Ximiao Wang;Jie Cheng;Xinxin Song;Xiangkai Han;Ning Zhang;Junjiang Bao;Gaohong He

State Key Laboratory of Fine Chemicals,Dalian University of Technology,Dalian 116023,China;School of Chemical Engineering,Dalian University of Technology,Panjin 124221,China

中国化学工程学报（英文版）

[1]Xiaopeng Zhang;Cheng Gao;Ziwei Wang;Ximiao Wang;Jie Cheng;Xinxin Song;Xiangkai Han;Ning Zhang;Junjiang Bao;Gaohong He-.CO3O4 with ordered pore structure derived from wood vessels for efficient Hg0 oxidation)[J].中国化学工程学报（英文版）,2022(10):215-221

CO3O4,Chemisorbed,Co3+to,Co2+to

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