Inherent thermal regeneration performance of different MnO2 crystallographic structures for mercury removal

Yao, Ting1,2; Duan, Yufeng1; Bisson, Teresa M.2; Gupta, Rajender2; Pudasainee, Deepak2; Zhu, Chun1; Xu, Zhenghe2,3

2019-07-15

10.1016/j.jhazmat.2019.04.006

JOURNAL OF HAZARDOUS MATERIALS   影响因子和分区

0304-3894

1873-3336

Manganese oxides with different crystallographic structures were investigated for gas-phase elemental mercury removal. The inherent thermal regeneration performance and mechanism of alpha- and gamma-MnO2 were studied. The manganese dioxides were found to possess a mercury removal efficiency of higher than 96% even after 120 min mercury exposure except for beta-MnO2 which removed much less mercury than Mn2O3. The alpha-MnO2 was found to have a higher recyclability of mercury capture and better durability for regeneration than gamma-MnO2. During the first 1 h of exposure, alpha-MnO2 showed an excellent mercury capacity of 128 mu g/g over 5 regeneration cycles. While for gamma-MnO2, the mercury capacity of the fifth cycle was reduced to 68.74 mu g/g, which is much lower than 131.42 mu g/g for the first cycle. The microstructure of alpha-MnO2 was maintained throughout regeneration cycles due to its capability to retain lattice oxygen. In comparison, gamma-MnO2 experienced reconstruction and phase transformation induced by oxygen vacancies due to lattice oxygen loss during regeneration process, leading to a degradation in mercury capture. The alpha-MnO2 oriented composite was found Corresponding to be better developed into a regenerable catalytic sorbent for mercury removal from flue gases of coal-fired power plants.

Manganese oxides Mercury removal Coal-fired power plants Regeneration performance Oxygen loss

SCI ; EI

英语

通讯

Postgraduate Research & Practice Innovation Program of Jiangsu Province[KYLX16_0201]

Engineering ; Environmental Sciences & Ecology

Engineering, Environmental ; Environmental Sciences

WOS:000472694500031

ELSEVIER SCIENCE BV

20191706813361

Coal ; Coal fueled furnaces ; Fossil fuel power plants ; Mercury (metal) ; Oxides ; Oxygen vacancies

Solid Fuels:524 ; Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals:549.3 ; Chemical Products Generally:804 ; Crystalline Solids:933.1

ENGINEERING

Web of Science

1.Southeast Univ, Key Lab Energy Thermal Convers & Control, Minist Educ, Sch Energy & Environm, Nanjing 210096, Jiangsu, Peoples R China
2.Univ Alberta, Dept Chem & Mat Engn, Edmonton, AB T6G 1H9, Canada
3.Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China

Yao, Ting,Duan, Yufeng,Bisson, Teresa M.,et al. Inherent thermal regeneration performance of different MnO2 crystallographic structures for mercury removal[J]. JOURNAL OF HAZARDOUS MATERIALS,2019,374:267-275.

Yao, Ting.,Duan, Yufeng.,Bisson, Teresa M..,Gupta, Rajender.,Pudasainee, Deepak.,...&Xu, Zhenghe.(2019).Inherent thermal regeneration performance of different MnO2 crystallographic structures for mercury removal.JOURNAL OF HAZARDOUS MATERIALS,374,267-275.

Yao, Ting,et al."Inherent thermal regeneration performance of different MnO2 crystallographic structures for mercury removal".JOURNAL OF HAZARDOUS MATERIALS 374(2019):267-275.