Co3O4 with ordered pore structure derived from wood vessels for efficient Hg0 oxidation

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

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Co₃O₄ with ordered pore structure derived from wood vessels for efficient Hg⁰ oxidation

Catalysis, Kinetics and Reaction Engineering | Updated：2026-01-06

- Co₃O₄ with ordered pore structure derived from wood vessels for efficient Hg⁰ oxidation
- Chinese Journal of Chemical Engineering Vol. 50, Issue 10, Pages: 215-221(2022)
- Affiliations：
  
  1. State Key Laboratory of Fine Chemicals, Dalian University of Technology,Dalian,China,116023
  2. School of Chemical Engineering, Dalian University of Technology,Panjin,China,124221
- Author bio：
- Funds：
- DOI：
  CLC：
- Published：2022
- Accepted：
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摘要

Abstract

Catalytic oxidation of Hg

to HgO is an efficient way to remove Hg

from coal-fired flue gas. The catalyst with ordered pore structure can lower mass transfer resistance resulting in higher Hg

oxidation efficiency. Therefore

in the present work

wood vessels were used as sacrificial template to obtain Co

with ordered pore structure. SEM and BET results show that

when the mass concentrations of Co(NO

)

·6H

O was 20%

the obtained catalyst (Co

[20%Co(NO

)

]

) possesses better pore structure and higher surface area. It will expose more available surface active sites and lower the mass transfer resistance. Furthermore

XPS results prove that Co

[20%Co(NO

)

]

has the highest ratio of chemisorbed oxygen which plays an important role in Hg

oxidation process. These results lead to a better Hg

oxidation efficiency of Co

[20%Co(NO

)

]

which is about 90% in the temperature range of 200 to 350 ℃. Furthermor

[20%Co(NO

)

]

has a stable catalytic activity

and its Hg

oxidation efficiency maintains 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 Co

[20%Co(NO

)

]

. Chemisorbed oxygen can react with Hg

forming HgO with the reduction of Co

to Co

. And lattice oxygen and gaseous oxygen can supplement the consumption of chemisorbed oxygen to oxidize Co

to Co

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Related Author

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Related Institution

2 Qinghai Huanghe Hydropower Development Co., Ltd (Xining Branch)

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