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Fan Y, Jin J, Liu Q, Xu K, Shi H, Liu D. Understanding the Impacts of Different Impurities on Elemental Mercury Removal by CaS in Chemical Looping Combustion of Coal: A First Principle Study. ACS OMEGA 2023; 8:31468-31479. [PMID: 37663458 PMCID: PMC10468996 DOI: 10.1021/acsomega.3c04372] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Accepted: 07/19/2023] [Indexed: 09/05/2023]
Abstract
CaSO4 has the advantages of abundant yield, high oxygen-carrying capacity, low cost, and no heavy metal pollution, making it promising as an oxygen carrier for chemical looping combustion (CLC). In comparison with other oxygen carriers, CaS as the reduced product of CaSO4 exhibits superior adsorption efficiency for Hg0 in the flue gas. In this paper, density functional theory (DFT) was used to investigate the adsorption mechanism of Hg0 on the adsorbent surface of CaS(001). The adsorption energies of different oxidized mercury species such as HgS, HgCl, and HgBr over the CaS surface were summarized. Furthermore, the effects of various flue gas components including SO2, H2S, S, HCl, Cl2, CO, H2, H2O, and C on Hg0 adsorption over the CaS(001) surface were evaluated. The results show that Hg0 can be adsorbed on the CaS(001) surface in a chemisorption manner with a reaction energy of -65.1 kJ/mol. The adsorption energy of different forms of mercury on the CaS(001) surface varies greatly, and mercury in the oxidized state is more easily captured by CaS. SO2 inhibits while other flue gas components promote Hg0 adsorption over the CaS surface. Overall, CaS tends to adsorb mercury in the reduction reactor and release mercury when CaS is re-oxidized to CaSO4 in the oxidation reactor. This is detrimental to mercury removal in the CLC of coal. This study sheds light on the migration and transformation of mercury in the CLC of coal with CaSO4 as the oxygen carrier.
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Affiliation(s)
- Yunpei Fan
- School
of Energy and Power Engineering, University
of Shanghai for Science and Technology, Shanghai 200093, China
- Shanghai
Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Jing Jin
- School
of Energy and Power Engineering, University
of Shanghai for Science and Technology, Shanghai 200093, China
- Shanghai
Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Qiuqi Liu
- School
of Energy and Power Engineering, University
of Shanghai for Science and Technology, Shanghai 200093, China
- Shanghai
Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Kailong Xu
- School
of Energy and Power Engineering, University
of Shanghai for Science and Technology, Shanghai 200093, China
- Shanghai
Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Huancong Shi
- School
of Energy and Power Engineering, University
of Shanghai for Science and Technology, Shanghai 200093, China
- Shanghai
Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Dunyu Liu
- School
of Energy and Power Engineering, University
of Shanghai for Science and Technology, Shanghai 200093, China
- Shanghai
Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
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Liu Q, Liu D, Ni M, Xu K, Ma J, Liu Z, Jin J, Shi H. Oxygen-Induced Elemental Mercury Oxidation in Chemical Looping Combustion of Coal. ACS OMEGA 2022; 7:20959-20967. [PMID: 35755379 PMCID: PMC9219527 DOI: 10.1021/acsomega.2c01709] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Accepted: 05/13/2022] [Indexed: 06/15/2023]
Abstract
Mercury emission is an important issue during chemical looping combustion (CLC) of coal. The aim of this work is to explore the effects of different flue gas components (e.g., HCl, NO, SO2, and CO2) on mercury transformation in the flue gas cooling process. A two-stage simulation method is used to reveal the reaction mechanism of these gases affecting elemental mercury (Hg0) oxidation. Furthermore, using this method, Hg0 oxidation by eight oxygen carriers (Co3O4, CaSO4, CeO2, Fe2O3, Al2O3, Mn2O3, SiO2, and CuO) commonly used in CLC are investigated and their Hg0 oxidation efficiencies were compared with the existing experimental results. The results show that HCl, NO, and CO2 promote Hg0 oxidation during flue gas cooling, while SO2 inhibits Hg0 oxidation. The stronger the oxygen release capacity of oxygen carriers, the higher the oxidation efficiency of Hg0 becomes. The order of Hg0 removal efficiency from high to low is Co3O4, CuO, Mn2O3, CaSO4, Fe2O3, CeO2, Al2O3, and SiO2, and this sequence is in good agreement with the existing experimental results. Different flue gas components directly or indirectly affect the O2 content, thus affecting the content of gaseous oxidized mercury (Hg2+). Different oxygen carriers have different oxygen release capacities and different Hg0 oxidation efficiencies. Therefore, O2 is the core species affecting the mercury transformation in CLC.
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Affiliation(s)
- Qiuqi Liu
- School
of Energy and Power Engineering, University
of Shanghai for Science and Technology, Shanghai 200093, China
- Shanghai
Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Dunyu Liu
- School
of Energy and Power Engineering, University
of Shanghai for Science and Technology, Shanghai 200093, China
- Shanghai
Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Mingguo Ni
- School
of Energy and Power Engineering, University
of Shanghai for Science and Technology, Shanghai 200093, China
- Shanghai
Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Kailong Xu
- School
of Energy and Power Engineering, University
of Shanghai for Science and Technology, Shanghai 200093, China
- Shanghai
Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Jingjing Ma
- State
Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical
Engineering, College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan, Ningxia 750021, China
| | - Zhuang Liu
- School
of Energy and Power Engineering, University
of Shanghai for Science and Technology, Shanghai 200093, China
- Shanghai
Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Jing Jin
- School
of Energy and Power Engineering, University
of Shanghai for Science and Technology, Shanghai 200093, China
- Shanghai
Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Huancong Shi
- Huzhou
Institute of Zhejiang University, Huzhou, Zhejiang 31300, China
- Environmental
Science and Technology, University of Shanghai
for Science and Technology, Shanghai 200093, China
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Yi L, Xie J, Li C, Shan J, Liu Y, Lv J, Li M, Gao L. LaO x modified MnO x loaded biomass activated carbon and its enhanced performance for simultaneous abatement of NO and Hg 0. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:2258-2275. [PMID: 34365596 DOI: 10.1007/s11356-021-15752-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Accepted: 07/27/2021] [Indexed: 06/13/2023]
Abstract
A battery of agricultural straw derived biomass activated carbons supported LaOx modified MnOx (LaMn/BACs) was prepared by a facile impregnation method and then tested for simultaneous abatement of NO and Hg0. 15%LaMn/BAC manifested excellent removal efficiency of Hg0 (100%) and NO (86.7%) at 180 °C, which also exhibited splendid resistance to SO2 and H2O. The interaction between Hg0 removal and NO removal was explored; thereinto, Hg0 removal had no influence on NO removal, while NO removal preponderated over Hg0 removal. The inhibitory effect of NH3 was greater than the accelerative effect of NO and O2 on Hg0 removal. The physicochemical characterization of related samples was characterized by SEM, XRD, BET, H2-TPR, NH3-TPD, and XPS. After incorporating suitable LaOx into 15%Mn/BAC, the synergistic effect between LaOx and MnOx contributed to the improvement of BET surface area and total pore volume, the promotion of redox ability, surface active oxygen species, and acid sites, inhibiting the crystallization of MnOx. 15%LaMn/BAC has the best catalytic oxidation activity at low temperature. That might be answerable for superior performance and preferable tolerance to SO2 and H2O. The results indicated that 15%LaMn/BAC was a promising catalyst for simultaneous abatement of Hg0 and NO at low temperature.
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Affiliation(s)
- Lei Yi
- School of Resources Environment and Safety Engineering, University of South China, Hengyang, 421001, People's Republic of China
| | - Jinke Xie
- School of Resources Environment and Safety Engineering, University of South China, Hengyang, 421001, People's Republic of China
| | - Caiting Li
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, People's Republic of China
| | - Jian Shan
- School of Resources Environment and Safety Engineering, University of South China, Hengyang, 421001, People's Republic of China
| | - Yingyun Liu
- School of Resources Environment and Safety Engineering, University of South China, Hengyang, 421001, People's Republic of China
| | - Junwen Lv
- School of Resources Environment and Safety Engineering, University of South China, Hengyang, 421001, People's Republic of China
| | - Mi Li
- School of Resources Environment and Safety Engineering, University of South China, Hengyang, 421001, People's Republic of China
| | - Lei Gao
- School of Resources Environment and Safety Engineering, University of South China, Hengyang, 421001, People's Republic of China.
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, People's Republic of China.
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Weng CH. Environmental concerns and pollution control in the context of developing countries. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:46085-46088. [PMID: 34264495 PMCID: PMC8280566 DOI: 10.1007/s11356-021-15004-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/15/2023]
Abstract
In the developing countries, the pace of change-in vital technologies, in scientific research, in economic fundamentals, in the living environment, and in pursuing quality of life-is accelerating every day, propelled by continuous changes in technology innovation, human activities, and the rapidly evolving demands of the COVID-19 pandemic. This special issue (SI) of Environmental Science and Pollution Research (ESPR) collected 17 peer-reviewed articles relating to green buildings research, the impact of climate change on the extreme weather events, forward osmosis membranes for water reuse, the impacts of human activities to fragile water environments and economy, air pollution control and carbon emission reduction, risk assessment of pollution hazard and water resources, adsorption reaction of antibiotic pollution in subsurface, synthesized novel adsorptive materials in response to nitrogen and phosphorus, dye, and toluene pollution. All selected papers were relevance to the theme of this SI and formally presented at the 2020 5th International Conference on Advances in Energy and Environment Research (ICAEER 2020) on September 18th-20th, 2020, Shanghai, China. For the safety of the participants, ICAEER 2020 was held via online presentation because of the coronavirus pandemic sweeping across all over the world. As an annually held conference, the upcoming 6th ICAEER 2021 is scheduled held in Shanghai from September 10 to 12, 2021 ( http://www.icaeer.org/index.html ). The guest editor (GE) of this SI welcomes you all to participate in this conference.
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Affiliation(s)
- Chih-Huang Weng
- Department of Civil Engineering, I-Shou University, Kaohsiung, Taiwan.
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