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• W4200455538 endingPage "20205" @default.
• W4200455538 startingPage "20197" @default.
• W4200455538 abstract "Arsenic emissions from coal-fired power plants are highly toxic and volatile, posing a serious threat to human health and the natural environment. The removal of arsenic from coal-fired flue gases has attracted widespread attention worldwide. Calcium-based sorbents can capture arsenic, thus solving the environmental problem of heavy metal arsenic pollution from coal-fired power plants, but its sintering and low capture efficiency impede its application. Doping CaO with CeO2 is an efficient technique to improve resistance to sintering and facilitate capture efficiency. In this study, the CeO2/CaO sorbent was synthesized by the sol–gel method and then carried out in the flue gas at high temperatures from 600 to 900 °C to capture gaseous arsenic. The introduction of CeO2 not only reduces the grain size of CaO, but uniformly dispersed CeO2 forms a barrier layer that effectively prevents the growth and sintering of CaO grains. As a result, the sintering resistance of the sorbent is enhanced, and the sorbent exhibits excellent thermal stability. On the basis of characterization analysis, lattice oxygen provided by cerium oxide greatly promotes the reaction process of As(III) oxidation to As(V). The experimental results demonstrate that CeO2/CaO possesses the highest arsenic capture capacity compared to untreated CaO and CeO2. With the increase of the temperature, the capture efficiency of CeO2/CaO increases and reaches a maximum of 1.90 mg/g at 900 °C. Additionally, the density functional theory (DFT) was further used to study the adsorption energy of untreated CaO and CeO2/CaO. The results exhibited that CeO2/CaO has stronger adsorption capacity for As2O3. Finally, the adsorption mechanism of As2O3 on CeO2/CaO was proposed. As a result of the excellent anti-sintering property and high capture capacity, CeO2/CaO is expected to be an excellent sorbent for arsenic removal from coal combustion flue gas." @default.
• W4200455538 created "2021-12-31" @default.
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• W4200455538 date "2021-12-07" @default.
• W4200455538 modified "2023-09-30" @default.
• W4200455538 title "Preparation of CeO₂/CaO with Anti-sintering for Efficient Capture of As₂O₃ from Flue Gas at a High Temperature" @default.
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• W4200455538 doi "https://doi.org/10.1021/acs.energyfuels.1c03213" @default.
• W4200455538 hasPublicationYear "2021" @default.
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