Open Access
ARTICLE
HCl-Induced Hg0 Transformation over CuMn2O4 Sorbent
Aijia Zhang, Yingju Yang, Jing Liu*, Junyan Ding
State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
* Corresponding Author: Jing Liu. Email:
(This article belongs to the Special Issue: Advancement of Understanding of PM2.5 and Hg Emissions and Their Control Technologies for Cleaner Combustion)
Energy Engineering 2022, 119(2), 499-510. https://doi.org/10.32604/ee.2022.015504
Received 23 December 2020; Accepted 21 May 2021; Issue published 24 January 2022
Abstract
CuMn
2O
4 spinel has been regarded as a highly efficient sorbent for Hg
0 capture from flue gas. The regenerability and recyclability of CuMn
2O
4 sorbent are mainly associated with the mercury speciation adsorbed on its surface. However, the effect mechanism of HCl on Hg
0 transformation over CuMn
2O
4 sorbent is still elusive. Experiments were conducted to understand the effect of HCl on Hg
0 transformation over CuMn
2O
4 sorbent. The results indicate that CuMn
2O
4 sorbent is a mesoporous material and possesses a good thermal stability. CuMn
2O
4 shows >95% Hg
0 removal efficiency in a wide temperature window of 50–350°C. The favorable electron-transfer environment caused by the mixed valence states of Cu and Mn cations is responsible for the excellent Hg
0 removal performance of CuMn
2O
4 sorbent. CuMn
2O
4 shows a higher Hg
0 adsorption capacity of 4774.57 μg/g. Hg
0 adsorption process over CuMn
2O
4 sorbent can be well described by the developed kinetic model. Hg
0 removal efficiency of CuMn
2O
4 sorbent does not depend on the presence of HCl. Mercury species adsorbed on the CuMn
2O
4 sorbent in the presence of HCl mainly exist in the forms of HgO and HgCl
2O
8 · H
2O. HCl shows a significant effect on mercury speciation over CuMn
2O
4 sorbent. Most of HgO species will be transformed into HgCl
2O
8 · H
2O in the presence of HCl.
Keywords
Cite This Article
Zhang, A., Yang, Y., Liu, J., Ding, J. (2022). HCl-Induced Hg
0 Transformation over CuMn
2O
4 Sorbent.
Energy Engineering, 119(2), 499–510. https://doi.org/10.32604/ee.2022.015504