Elemental Mercury Removal over CeO2/TiO2 Catalyst Prepared by Sol–Gel Method

Lv, Qiang; Wang, Chang‐An; Yang, He; Cai, Mingxuan; Che, Defu

doi:10.3390/app10082706

Cited by 7 publications

(5 citation statements)

References 34 publications

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“…This may be because the catalyst synthesized by the sol–gel method has a large specific surface area and abundant surface chemisorption oxygen, which are of great significance to the catalytic activity of the catalyst . Similarly, some researchers also revealed that the catalysts synthesized by the sol–gel method exhibited superior catalytic performance for Hg 0 oxidation . For the Mn-VWTi catalyst, the addition of Mn could enhance the Hg 0 oxidation activity of the catalysts.…”

Section: Resultsmentioning

confidence: 99%

“…28 Similarly, some researchers also revealed that the catalysts synthesized by the sol−gel method exhibited superior catalytic performance for Hg 0 oxidation. 29 For the Mn-VWTi catalyst, the addition of Mn could enhance the Hg 0 oxidation activity of the catalysts. For instance, more than 95% of E oxi could be achieved over Mn 3 -VWTi catalyst at 200−350 °C.…”

Section: Effects Of Mn Contents Onmentioning

confidence: 99%

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New Insight into Hg⁰ Oxidation over a Mn-Doped VWTi Catalyst at a Wide Temperature Window

Jia,

Li,

Chang

et al. 2023

Energy Fuels

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A series of Mn-doped VWTi (Mn-VWTi) catalysts were prepared and used for simultaneous NO removal and Hg0 oxidation at a wide temperature window of 200–400 °C for the first time, and the catalytic activity of the Mn-VWTi catalysts was investigated. The results indicated that Mn doping could notably improve the NO removal activity at 200–300 °C and the Hg0 oxidation activity at 200–400 °C, and the catalyst with 3% Mn loading exhibited superior catalytic activity. The relationship between NO removal and Hg0 oxidation and the effects of NO and NH3 concentrations on Hg0 oxidation over a Mn3-VWTi catalyst were also explored to verify the possibility of synergistic NO removal and Hg0 oxidation on a Mn-VWTi catalyst at a wide temperature window of 200–400 °C. In addition, several characterization methods, including Brunauer–Emmett–Teller, X-ray diffraction, H2 temperature-programmed reduction, X-ray photoelectron spectroscopy, and Hg temperature-programmed desorption, were used to characterize the catalyst, and the Hg0 oxidation mechanism over the Mn3-VWTi catalyst was also investigated based on the experimental data and characterization results. It was revealed that Mn species with higher valence states (Mn4+/Mn3+) played a major role during the Hg0 oxidation process at the lower temperature of 250 °C, while the synergistic interaction between Mn and V species (Mn4+/Mn3+ + V4+ ↔ Mn2+ + V5+) showed a dominant role in Hg0 oxidation at the higher temperature of 350 °C. Moreover, the oxidized mercury species mainly existed in the form of HgO on the catalyst surface.

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Section: Resultsmentioning

confidence: 99%

Section: Effects Of Mn Contents Onmentioning

confidence: 99%

New Insight into Hg⁰ Oxidation over a Mn-Doped VWTi Catalyst at a Wide Temperature Window

Jia,

Li,

Chang

et al. 2023

Energy Fuels

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“…In addition to indirectly promoting mercury oxidation, the OCs may also react directly with Hg 0 . Previous studies showed that lattice oxygen in metal oxides can be converted into surface reactive oxygen species and then oxidize elemental mercury directly. − Perez-Vega et al found that copper oxide in OCs significantly promoted the heterogeneous oxidation reaction of Hg 0 . Besides, Mendiara et al pointed out that the pore structure of the OCs provides adsorption sites for gas-phase Hg 0 .…”

Section: Introductionmentioning

confidence: 99%

Review and Perspectives on Mercury Release and Migration during Chemical Looping Combustion of Solid Fuels

Lyu,

Guan,

et al. 2024

Energy Fuels

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Chemical looping combustion (CLC) is a promising technology for global carbon reduction. In the CLC system, mercury released during combustion is not only a hazardous pollutant but also a risk to the system safety because mercury can easily lead to the amalgamation and fracture of the decarbonizing equipment. Understanding the mercury release and migration characteristics is the foundation for the safe operation of the CLC system. The purpose of this study is to lay the scientific foundation for achieving deep mercury removal during the CLC of solid fuels. The mercury flow and distribution within the CLC system were discussed. The differences in mercury release between CLC and conventional combustion or gasification were analyzed. The influence mechanisms of the key factors, such as fuel type, temperature, atmosphere, and oxygen carrier, on the release and migration fate of mercury during the CLC processes were discussed. The removal mechanisms of elemental mercury in the CLC system were revealed. Finally, research perspectives on mercury control in the CLC system were proposed. This review includes a comprehensive review of the latest research progress on mercury emission control within the CLC system. The findings of this study can provide guidance for the development of the deep mercury removal technology during CLC processes and help break the bottleneck which restricts the long-term safe operation of the CLC system.

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“…The removal difficulty varies for different forms of mercury. Elemental mercury (Hg 0 ), with low solubility and high volatility, is the most difficult to remove, while oxidized mercury (Hg 2+ ) and particulate mercury (Hg p ) are relatively easier to remove [12,13]. Therefore, promoting the transformation of Hg 0 to Hg 2+ and Hg p is the key to realizing deep mercury removal.…”

Section: Introductionmentioning

confidence: 99%

Review on Mercury Control during Co-Firing Coal and Biomass under O2/CO2 Atmosphere

Lyu,

Xin

2024

Applied Sciences

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Combining biomass co-firing with oxy-fuel combustion is a promising Bioenergy with Carbon Capture and Storage (BECCS) technology. It has the potential to achieve a large-scale reduction in carbon emissions from traditional power plants, making it a powerful tool for addressing global climate change. However, mercury in the fuel can be released into the flue gas during combustion, posing a significant threat to the environment and human health. More importantly, mercury can also cause the fracture of metal equipment via amalgamation, which is a major risk for the system. Therefore, compared to conventional coal-fired power plants, the requirements for the mercury concentration in BECCS systems are much stricter. This article reviews the latest progress in mercury control under oxy-fuel biomass co-firing conditions, clarifies the impact of biomass co-firing on mercury species transformation, reveals the influence mechanisms of various flue gas components on elemental mercury oxidation under oxy-fuel combustion conditions, evaluates the advantages and disadvantages of various mercury removal methods, and finally provides an outlook for mercury control in BECCS systems. Research shows that after biomass co-firing, the concentrations of chlorine and alkali metals in the flue gas increase, which is beneficial for homogeneous and heterogeneous mercury oxidation. The changes in the particulate matter content could affect the transformation of gaseous mercury to particulate mercury. The high concentrations of CO2 and H2O in oxy-fuel flue gas inhibit mercury oxidation, while the effects of NOx and SO2 are dual-sided. Higher concentrations of fly ash in oxy-fuel flue gas are conducive to the removal of Hg0. Additionally, under oxy-fuel conditions, CO2 and metal ions such as Fe2+ can inhibit the re-emission of mercury in WFGD systems. The development of efficient adsorbents and catalysts is the key to achieving deep mercury removal. Fully utilizing the advantages of chlorine, alkali metals, and CO2 in oxy-fuel biomass co-firing flue gas will be the future focus of deep mercury removal from BECCS systems.

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Elemental Mercury Removal over CeO2/TiO2 Catalyst Prepared by Sol–Gel Method

Cited by 7 publications

References 34 publications

New Insight into Hg⁰ Oxidation over a Mn-Doped VWTi Catalyst at a Wide Temperature Window

New Insight into Hg⁰ Oxidation over a Mn-Doped VWTi Catalyst at a Wide Temperature Window

Review and Perspectives on Mercury Release and Migration during Chemical Looping Combustion of Solid Fuels

Review on Mercury Control during Co-Firing Coal and Biomass under O2/CO2 Atmosphere

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Elemental Mercury Removal over CeO2/TiO2 Catalyst Prepared by Sol–Gel Method

Cited by 7 publications

References 34 publications

New Insight into Hg0 Oxidation over a Mn-Doped VWTi Catalyst at a Wide Temperature Window

New Insight into Hg0 Oxidation over a Mn-Doped VWTi Catalyst at a Wide Temperature Window

Review and Perspectives on Mercury Release and Migration during Chemical Looping Combustion of Solid Fuels

Review on Mercury Control during Co-Firing Coal and Biomass under O2/CO2 Atmosphere

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Product

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New Insight into Hg⁰ Oxidation over a Mn-Doped VWTi Catalyst at a Wide Temperature Window

New Insight into Hg⁰ Oxidation over a Mn-Doped VWTi Catalyst at a Wide Temperature Window