Gaseous mercury capture using supported CuSx on layered double hydroxides from SO2-rich flue gas
Gaseous mercury capture using supported CuSx on layered double hydroxides from SO2-rich flue gas
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使用层状双氢氧化物负载 CuSx 从富含 SO2 的烟气中捕获气态汞
DOI:
10.1016/j.cej.2020.125963
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发表时间:
2020-11
影响因子:
15.1
通讯作者:
Yan Naiqiang
中科院分区:
文献类型:
--
作者:
Hong Qinyuan;Xu Haomiao;Yuan Yong;Shen Yi;Wang Yalin;Huang Wenjun;Qu Zan;Yan Naiqiang
Gaseous elemental mercury (Hg0) co-existed with high concentration of SO2is a typical flue gas. Most traditional Hg0sorbents are restricted to practical application owing to low reaction rate, small mercury capacity, and especially, poor resistance to SO2. The CuSx/layered double hydroxides (LDH) composite was preparedviathe anion-exchange between poly-sulfur ions Sx2−and LDH. Metallic Cu2+modification guarantee the exposure of more sulfur active sites due to the regulatory effect of metal ions. CuSx/LDH exhibited excellent Hg0removal performance at low temperature (75 °C) with SO2concentration of 500–2000 ppm. The porous structure and large surface area were beneficial for gas transfer through its interior structure and surface. Surface Sx2−was the primary sites for Hg0oxidation and immobilization (Hg0+ Sx2−→ HgS + Sx-12−). Moreover, Cu2+also acted as the electron acceptor to oxidize Hg0to Hg2+which further combined with S2−to form HgS on the surface of the sorbent (Hg0+ 2Cu2+→ Hg2++2Cu+, Hg2++S2−→ HgS). Such a composite was a promising material for practical applications to various flue gas conditions, especially for SO2-rich flue gas.
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