期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 406, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.124744
关键词
Hg-0 recovery; Sulfureted activated V2O5-MoO3/TiO2; Safe disposal of spent SCR catalyst; Adsorption kinetics; Smelting flue gas
资金
- National Natural Science Foundation of China [21777070, 21906070]
- Natural Science Foundation of Jiangsu Province, China [BK20190616]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province, China [KYCX20_1834]
The study focused on capturing gaseous Hg-0 from non-ferrous metal smelting flue gas by sulfuring deactivated V2O5-MoO3/TiO2. It was found that sulfureted deactivated V2O5-MoO3/TiO2 maintained excellent capture performance and reproducibility even after the addition of V2O5 and CaSO4.
The reduction of Hg emissions from non-ferrous metal smelting was proposed in the Minamata Convention. Regenerable sulfureted MoO3/TiO2, which displayed excellent performance in capturing gaseous Hg-0, was once developed by us to recover gaseous Hg-0 in smelting flue gas (SFG) for centralized control. Recently, a large amount of spent commercial selective catalytic reduction catalysts (for example V2O5-MoO3/TiO2) mostly deactivated by CaSO4 was formed, creating a need for their safe disposal. As the main constituent of deactivated V2O5-MoO3/TiO2 is MoO3/TiO2, deactivated V2O5-MoO3/TiO2 was sulfureted to capture gaseous Hg-0 from SFG for its safe disposal and the effects of V2O5 and CaSO4 on Hg-0 adsorption onto sulfureted MoO3/TiO2 were investigated. Although the capturing capacity of sulfureted MoO3/TiO2 moderately decreased after the impregnation of V2O5 and CaSO4, sulfureted deactivated V2O5-MoO3/TiO2 still displayed excellent performance and reproducibility in gaseous Hg-0 capture. Meanwhile, the cost performance of sulfureted deactivated V2O5-MoO3/TiO2 for Hg-0 capture was outstanding as deactivated V2O5-MoO3/TiO2 needs to be safely disposed. Therefore, deactivated V2O5-MoO3/TiO2 can be sulfureted as a regenerable and low-cost sorbent that is effective in recovering gaseous Hg-0 from SFG, as well as being a cost-effective and environmentally friendly method for the safe disposal of spent V2O5-MoO3/TiO2 for Hg-0.
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