超声波辅助氧化改性钙基吸收剂的制备及性能研究

doi:10.11896/cldb.21010211

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Abstract In this work, the oxidants such as K₂S₂O₈, Ca(ClO)₂, (NH₄)₄Ce(SO₄)₄ and K₂Cr₂O₇ were impregnated on the surface of calcium-based absorbent by ultrasonic-assisted solution impregnation method, and the active sites with oxidation were formed to improve the effect of cal-cium-based absorbent on NO_x removal. Through orthogonal experiment, under different ultrasonic power, impregnation time and impregnation temperature, the calcium-based absorbent was chemically modified by oxidant according to a certain doping ratio. The simultaneous desulfurization and denitrification experiments of modified calcium-based absorbent were carried out in a fixed bed reactor, and the average removal rate of pollutants was selected as the evaluation index. The orthogonal experiment results showed that Ca(ClO)₂ was the best oxidant for ultrasonic impregnation modification. The optimal modification process parameters were as follows: the oxidant doping ratio of 20%, the ultrasonic power of 100%, the impregnation time of 1.5 h, and the impregnation temperature of 70 ℃. At the same time, based on the crystal structure (XRD) analysis and scanning electron microscopy (SEM), it can be seen that the ultrasonic-assisted oxidation modification method can effectively improve the surface morphology of calcium-based absorbent, and the oxidation sites are formed on the surface. On the one hand, it can increase the contact between the absorbent and SO₂ and NO_x, on the other hand, it can promote the oxidation of NO to NO₂, and further improve the removal rate of both.

Key words： calcium-based absorbent ultrasonic impregnation oxidation desulfurization and denitrification chemical conditioning

Published: 25 January 2022 Online: 2022-01-26

CLC number:

TB332

Fund:Shaanxi Provincial Department of Education 2020 Key Scientific Research Plan(Collaborative Innovation Center Project) (20JY041) , Qingyuan Science and Technology Plan Project (2020KJJH040).

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	Articles by authors
	REN Zhixiang
	YANG Kang
	LI Taizhi
	YU Chen
	ZHAN Hua
	WU Feng
	LI Hui

Cite this article:

REN Zhixiang,YANG Kang,LI Taizhi, et al. Preparation of Ultrasonic Impregnated Oxidized Calcium-based Absorbent and Its Desulfurization and Denitrification Properties[J]. Materials Reports, 2022, 36(2): 21010211-5.

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http://www.mater-rep.com/EN/10.11896/cldb.21010211 OR http://www.mater-rep.com/EN/Y2022/V36/I2/21010211

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