ZnCl<sub>2</sub>溶液对褐煤半焦表面性质及其中高温脱汞性能的影响

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Abstract

The modified semi-coke (ZSC) was obtained by the pyrolysis of ZnCl₂-impregnated lignite at 700℃. N₂ adsorption/desorption, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy were used to characterize the surface physical and chemical properties of original and modified semi-coke, and the gaseous elemental mercury (Hg⁰) removal performance of two kinds of semi-coke has been investigated in a lab-scale fixed-bed reactor. The experimental results showed that ZSC had more developed hole structure, large specific surface area and abundant C—Cl groups. The mercury removal efficiency of ZSC decreased as the adsorption temperature was raised in the temperature range of 100℃ to 360℃. Generally, the ZSC exhibited good mercury removal performance at elevated temperatures. During the chemisorption process, the Hg⁰ was partly oxidized to HgCl or HgCl₂ by C—Cl groups, and the others reacted with oxygen contained functional groups on the surface of semi-coke to generate HgO simultaneously. Finally, the Hg⁰ was captured in the form of HgCl₂ or HgO on the surface of semi-coke.

Key words： lignite semi-coke gaseous Hg⁰ oxygen contained functional group ZnCl₂ solution modified mechanism of mercury removal

Received: 31 August 2015

PACS:

X701

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	Articles by authors
	WANG Li
	CHEN Jiang-yan
	ZHAO Ke
	ZHANG Hua-wei

Cite this article:

WANG Li,CHEN Jiang-yan,ZHAO Ke等. Influence of ZnCl₂ solution impregnation on the surface properties of lignite semi-coke and its mercury removal performance at elevated temperature[J]. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(3): 702-708.

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http://manu36.magtech.com.cn/Jweb_zghjkx/EN/ OR http://manu36.magtech.com.cn/Jweb_zghjkx/EN/Y2016/V36/I3/702

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