加速锰铁氧系氨氮亚硝化催化剂活化的研究

doi:10.11896/cldb.21120199

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Abstract Using manganese salt, iron salt and trace elements as raw materials, a ferromanganese catalyst which can oxidize NH₄⁺ to NO₂^- by using dissolved oxygen in water after 150 h activation period was prepared. The analysis and characterization results of the micro-properties changes of the catalysts before and after activation showed that the morphology of the catalysts did not change significantly, but the Zeta potential of the catalysts after activation became significantly negative, which was more favorable for positively charged NH₄⁺ to adsorb on its surface. The phase composition was analyzed. The results showed that the catalyst is a manganese-iron composite oxide composed of δ-MnO₂ and Fe₂O₃, and the phase peaks of δ-MnO₂ and Fe₂O₃ increase after activation. In addition, in the activated ammonium catalyst, Mn(Ⅱ) decreased and Mn(Ⅳ) increased, FeOOH decreased and Fe₂O₃ increased, oxygen carbonate decreased and adsorbed oxygen increased. In view of the changes of species and microscopic properties in the activation process, the unactivated catalyst was soaked in NaClO solution to accelerate the transformation of Mn(Ⅱ) to Mn(Ⅳ), which could shorten the activation time from 150 h to 85 h. The activation time can be shortened from 150 h to 100 h by promoting the conversion of FeOOH to Fe₂O₃ by heating dehydration.

Key words： nitrosation catalyst catalytic oxidation activation process microstructure

Published: 25 May 2023 Online: 2023-05-23

CLC number:

TB34

Fund:National Natural Science Foundation of China (22075012, 21506010).

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	Articles by authors
	XU Xiaorui
	MO Hengliang
	TANG Yang
	LIU Manman
	HOU Wanyi
	LI Suoding
	ZHAO Wenfang
	YANG Hengyu
	WAN Pingyu

Cite this article:

XU Xiaorui,MO Hengliang,TANG Yang, et al. Study on Accelerating the Activation of Ferromanganese Ammonia-Nitrogen Nitrosation Catalyst[J]. Materials Reports, 2023, 37(10): 21120199-6.

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http://www.mater-rep.com/EN/10.11896/cldb.21120199 OR http://www.mater-rep.com/EN/Y2023/V37/I10/21120199

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