Research of mercury removal from sintering flue gas of iron and steel by the open metal site of Mil-101(Cr)

Songjian Zhao; Jian Mei; Haomiao Xu; Wei Liu; Zan Qu; Yong Cui; Naiqiang Yan

doi:10.1016/j.jhazmat.2017.12.016

Research of mercury removal from sintering flue gas of iron and steel by the open metal site of Mil-101(Cr)

J Hazard Mater. 2018 Jun 5:351:301-307. doi: 10.1016/j.jhazmat.2017.12.016. Epub 2017 Dec 7.

Authors

Songjian Zhao¹, Jian Mei², Haomiao Xu², Wei Liu², Zan Qu², Yong Cui³, Naiqiang Yan⁴

Affiliations

¹ School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dong Chuan Road, Shanghai, 200240, PR China; School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dong Chuan Road, Shanghai, 200240, PR China.
² School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dong Chuan Road, Shanghai, 200240, PR China.
³ School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dong Chuan Road, Shanghai, 200240, PR China.
⁴ School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dong Chuan Road, Shanghai, 200240, PR China. Electronic address: nqyan@sjtu.edu.cn.

PMID: 29554527
DOI: 10.1016/j.jhazmat.2017.12.016

Abstract

Metal-organic frameworks (MOFs) adsorbent Mil-101(Cr) was introduced for the removal of elemental mercury from sintering flue gas. Physical and chemical characterization of the adsorbents showed that MIL-101(Cr) had the largest BET surface area, high thermal stability and oxidation capacity. Hg⁰ removal performance analysis indicated that the Hg⁰ removal efficiency of MIL-101(Cr) increased with the increasing temperature and oxygen content. Besides, MIL-101(Cr) had the highest Hg⁰ removal performance compared with Cu-BTC, UiO-66 and activated carbon, which can reach about 88% at 250 °C. The XPS and Hg-TPD methods were used to analyze the Hg⁰ removal mechanism; the results show that Hg⁰ was first adsorbed on the surface of Mil-101(Cr), and then oxidized by the open metal site Cr³⁺. The generated Hg²⁺ was then combined surface adsorbed oxygen of adsorbent to form HgO, and the open metal site Cr²⁺ was oxidized to Cr³⁺ by surface active oxygen again. Furthermore, MIL-101(Cr) had good chemical and thermal stability.

Keywords: Adsorbent; Mercury; Mil-101(Cr); Removal.