Mercury removal by Co3O4@TiO2@Fe2O3 magnetic core-shell oxygen carrier in chemical-looping combustion

Xu, Ke; Liu, Dunyu; Feng, Lijuan; Jin, Jing; Xiong, Zhibo; Ni, Mingguo; Liu, Zhuang; Liu, Qiuqi; Hou, Fengxiao

doi:10.1016/j.fuel.2021.121604

Cited by 26 publications

(15 citation statements)

References 66 publications

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“…Pérez-Vega et al used CuO as OC and found that Hg P accounted for 59.4% of the total Hg . It was reported that mercury on OC (Co 3 O 4 @TiO 2 @Fe 2 O 3 ) was mainly desorbed in the form of HgO, which was beneficial for mercury removal . It was found that 24.14% of the mercury in the coal migrated to the OC (CuFe 2 O 4 ) with the forms of Hg 0 , HgO, and HgCl 2 in CLG .…”

Section: Resultsmentioning

confidence: 99%

“…18 It was reported that mercury on OC (Co 3 O 4 @TiO 2 @Fe 2 O 3 ) was mainly desorbed in the form of HgO, which was beneficial for mercury removal. 15 It was found that 24.14% of the mercury in the coal migrated to the OC (CuFe 2 O 4 ) with the forms of Hg 0 , HgO, and HgCl 2 in CLG. 27 Ma et al analyzed the mercury on the oxidized OC (CuO@TiO 2 -Al 2 O 3 ) by X-ray photoelectron spectra (XPS).…”

Section: Effect Of Nomentioning

confidence: 99%

“…OC circulates between FR and AR to realize its reduction and regeneration . Therefore, the core of CLC is to select appropriate OC, which can not only provide lattice oxygen , but also catalyze the oxidation of Hg 0 released by coal combustion and effectively reduce the emission of Hg 0 …”

Section: Introductionmentioning

confidence: 99%

“…12 Therefore, the core of CLC is to select appropriate OC, which can not only provide lattice oxygen 13,14 but also catalyze the oxidation of Hg 0 released by coal combustion and effectively reduce the emission of Hg 0 . 15 The reactor temperature of CLC is about 800−1000 °C. It is generally considered that when the temperature is higher than 800 °C, the mercury species mainly exist as Hg 0 .…”

Section: Introductionmentioning

confidence: 99%

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Oxygen-Induced Elemental Mercury Oxidation in Chemical Looping Combustion of Coal

Liu

et al. 2022

ACS Omega

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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, SO 2 , and CO 2 ) 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 (Hg 0 ) oxidation. Furthermore, using this method, Hg 0 oxidation by eight oxygen carriers (Co 3 O 4 , CaSO 4 , CeO 2 , Fe 2 O 3 , Al 2 O 3 , Mn 2 O 3 , SiO 2 , and CuO) commonly used in CLC are investigated and their Hg 0 oxidation efficiencies were compared with the existing experimental results. The results show that HCl, NO, and CO 2 promote Hg 0 oxidation during flue gas cooling, while SO 2 inhibits Hg 0 oxidation. The stronger the oxygen release capacity of oxygen carriers, the higher the oxidation efficiency of Hg 0 becomes. The order of Hg 0 removal efficiency from high to low is Co 3 O 4 , CuO, Mn 2 O 3 , CaSO 4 , Fe 2 O 3 , CeO 2 , Al 2 O 3 , and SiO 2 , and this sequence is in good agreement with the existing experimental results. Different flue gas components directly or indirectly affect the O 2 content, thus affecting the content of gaseous oxidized mercury (Hg 2+ ). Different oxygen carriers have different oxygen release capacities and different Hg 0 oxidation efficiencies. Therefore, O 2 is the core species affecting the mercury transformation in CLC.

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Section: Resultsmentioning

confidence: 99%

Section: Effect Of Nomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Oxygen-Induced Elemental Mercury Oxidation in Chemical Looping Combustion of Coal

Liu

et al. 2022

ACS Omega

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Section: General View Of Fe-based Oxygen Carriersmentioning

confidence: 99%

Research Progress and Perspectives of Solid Fuels Chemical Looping Reaction with Fe-Based Oxygen Carriers

et al. 2022

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Chemical looping (CL) is regarded as a promising technology in industrial applications, because of its inherent characteristic of CO 2 capture. The technique of CL is applied in solid fuels fields, including chemical looping combustion (CLC), chemical looping gasification (CLG), chemical looping reforming (CLR), chemical looping water splitting (CLWS), and oxygen carrier aided combustion (OCAC). Oxygen carrier is a core media in chemical looping reaction, which plays the role of transporting oxygen and has the function of decreasing the energy penalty of air separation. Among all oxygen carriers, ironbased (Fe-based) materials are of most possibilities to be applied in industrial field, because of its economical and eco-friendly characteristics. Some reviews have reported the Fe-based oxygen carrier in CL application. However, the related preparation methods, overall application of CL and theoretical reaction calculation of Fe-based oxygen carriers have not been covered comprehensively. In this Review, the general view of Fe-based oxygen carrier including iron ores and artificial synthesis are reviewed. In addition, the different synthesis methods of Fe-based oxygen carrier are meticulously and profoundly summarized, involving mechanical mixing, impregnation, spraying drying, freeze granulation, sol−gel, solution combustion, and coprecipitation method. Then, the characteristics of Fe-based oxygen carrier from the perspectives of thermodynamics, redox kinetics analysis, antisintering and wear property of iron oxides are discussed in detail. Furthermore, the chemical looping reaction mechanism of Fe-based oxygen carriers is reviewed from the perspectives of reaction and oxygen carrier migration mechanism. Moreover, this review summarizes the application of Fe-based oxygen carrier in CLC, CLG, CLR, CLWS, and OCAC. And the recent progress of reaction mechanism of oxygen carrier by density functional theory (DFT) calculations and machine learning are further presented. Finally, the challenges and prospects for Fe-based oxygen carrier with the corresponding effective strategies are proposed. It is expected that this Review may provide insights into the Fe-based oxygen carrier and the practical application of chemical looping.

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Decarbonizing power and fuels production by chemical looping processes: Systematic review and future perspectives

Palone,

Cedola,

Borello

et al. 2024

Applied Thermal Engineering

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Mercury removal by Co3O4@TiO2@Fe2O3 magnetic core-shell oxygen carrier in chemical-looping combustion

Cited by 26 publications

References 66 publications

Oxygen-Induced Elemental Mercury Oxidation in Chemical Looping Combustion of Coal

Oxygen-Induced Elemental Mercury Oxidation in Chemical Looping Combustion of Coal

Research Progress and Perspectives of Solid Fuels Chemical Looping Reaction with Fe-Based Oxygen Carriers

Decarbonizing power and fuels production by chemical looping processes: Systematic review and future perspectives

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