Ce-Mn/TiO<sub>2</sub>吸附剂的脱汞性能及抗SO<sub>2</sub>特性

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Abstract

Mn/TiO₂ (MT), Ce/TiO₂ (CT) and Ce-Mn/TiO₂ (CMT) sorbents for mercury removal were prepared by the impregnation method. Mercury adsorption experiments were conducted on a fixed-bed reactor. The mercury removal performance of the three sorbents gradually increased with the increase of temperature in the range of 100~200℃. The maximum mercury capture efficiency of 91%, 58% and 95% were observed at 200℃ for MT, CT and CMT, respectively. The mercury removal efficiency decreased when the temperature was higher than 200℃. When MT and CT sorbents were exposed in the flue gas with N₂+6%O₂+1000×10^-6SO₂, the decrease of mercury removal efficiency to 50% within 30min was observed, indicating the weak SO₂resistance of MT and CT. However, mercury removal efficiency of more than 80% was maintained by CMT within 2h. It revealed that Ce doping in MT not only improved the mercury removal performance, but also enhanced the SO₂resistance. Physicochemical characteristics of the sorbents were analyzed by N₂adsorption/desorption, X-ray diffraction (XRD), H₂-temperature programmed reduction (H₂-TPR) and X-ray photoelectron spectroscopy (XPS). The spent sorbents were analyzed by thermogravimetric analysis (TG) and temperature programmed desorption (TPD) experiments. Based on the experimental and characterization results, the mechanism of SO₂resistance of the CMT for mercury removal was interpreted. The doping of Ce improved the dispersion of active components on the sorbent surface and the ratio of Mn⁴⁺, which was favorable for mercury removal; Compared with MnO₂, CeO₂preferentially react with SO₂, which inhibited the toxic effect on Mn⁴⁺, thus improving the SO₂resistance.

Key words： manganese cerium sorbent Hg⁰ removal SO₂ resistance performance

Received: 12 November 2018

PACS:

X511

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	Articles by authors
	WU Xiang
	DUAN Yu-feng
	YAO Ting
	LI Na
	HU Peng
	WEI Hong-qi
	REN Shao-jun

Cite this article:

WU Xiang,DUAN Yu-feng,YAO Ting等. Mercury removal performance and SO₂ resistance of Ce-Mn/TiO₂ sorbent[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(6): 2336-2343.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I6/2336

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