Recovering gaseous Hg0 using sulfureted phosphotungstic acid modified γ-Fe2O3 from power plants burning Hg-rich coal for centralized control
Recovering gaseous Hg0 using sulfureted phosphotungstic acid modified γ-Fe2O3 from power plants burning Hg-rich coal for centralized control
复制标题
采用硫化磷钨酸改性γ-Fe2O3从燃烧富汞煤的电厂中回收气态Hg0，进行集中控制。
DOI：
10.1016/j.jhazmat.2020.124381
复制
发表时间：
2021-01-20
影响因子：
13.6
通讯作者：
Yang, Shijian
中科院分区：
文献类型：
--
作者：
Wang, Chang;Zhang, Xufan;Yang, Shijian
Conversion of gaseous elemental mercury (Hg-0) to particulate-bound mercury (HgP) by the injection of disposable sorbents or to gaseous oxidized mercury (Hg2+) by catalysts is not suitable to control Hg-0 emissions from power plants burning Hg-rich coal because removed Hg may be released as secondary pollution, particularly during the employment of fly ash and desulfurization gypsum. In this study, sulfureted phosphotungstic acid modified gamma-Fe2O3 (HPW/gamma-Fe2O3) was employed as a magnetic and reproducible sorbent to recover gaseous Hg-0 in coal-fired flue gas for the centralized control. Sulfureted HPW/gamma-Fe2O3 showed an excellent capacity to enrich gaseous Hg-0 from low concentrations to ultra-high concentrations (>10 mg m(-3)), which benefited to condensing it into liquid Hg. Moreover, sulfureted HPW/gamma-Fe2O3 exhibited excellent para-magnetism, enabling it to be magnetically reclaimed after Hg-0 capture; this magnetization did not disappear after multiple thermal desorption of Hg-0 due to its excellent thermal stability. Furthermore, sulfureted HPW/gamma-Fe2O3 was regenerated by resulfuration without decreasing the Hg-0 capture performance. Therefore, gaseous Hg-0 recovery using sulfureted HPW/gamma-Fe2O3 is a promising, economical-effective, and eco-friendly technology for the centralized control of Hg pollution emitted from power plants that burn coal with a high Hg content.
