Preparation of CeO2/CaO with Anti-sintering for Efficient Capture of As2O3 from Flue Gas at a High Temperature

• DOI: 10.1021/acs.energyfuels.1c03213
• Publication Date: 2021-12-07T18:21:25Z
• Authors: Shuai Li; Zhaopeng Zhang; Qianyan Liu; Jiandong Hong; Yang Ling; Meilin Zhang; Qizhen Liu; Jiang Wu; Guangqian Luo; Hong Yao; Xialin Xie; Pengcheng Zhao
• Keywords: Cerium oxide

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