助剂添加对CuO/TiO<sub>2</sub>催化剂NH<sub>3</sub>-SCO性能的影响研究

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Abstract A series of CuO-MO_x/TiO₂ (M=W, Zr, La) catalysts were prepared by impregnation method for the selective catalytic oxidation of NH₃, and the effects of SO₂ poisoning on the oxidation of NH₃ over Cu/Ti-based catalysts were investigated. The results show that adding of transition metal oxides decreased the NH₃ conversion efficiency of Cu/Ti catalyst slightly, but significantly improved the N₂ selectivity. WO₃ was the best promoter among those additives, with an increase of N₂ selectivity by 36% at 300℃ in comparison to Cu/Ti catalyst. The H₂-TPR and NH₃-TPD results indicate that adding of WO₃ significantly increased the number of acid sites on the surface of Cu/Ti catalyst, and promoted the adsorption of NH₃. But it affected the redox performance of the catalyst and inhibited the oxidation of NH₃ to NO_x. After SO₂ poisoning, the N₂ selectivity of CuO-MO_x/TiO₂ catalyst was further improved. The characterization results shows that the increase of acid sites and the reduction of redox performance are the key factors to improve the N₂ selectivity.

Key words： Cu/Ti-based catalysts NH₃ selective catalytic oxidation metal oxide adding SO₂ poisoning

Received: 17 March 2023

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X511

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	Articles by authors
	CHEN Hao-hui
	WANG Ya-zhou
	YU Jie
	QIU Lei
	YIN Yi-meng
	WANG Chi-zhong
	CHANG Hua-zhen

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CHEN Hao-hui,WANG Ya-zhou,YU Jie等. Effect of additives and SO₂ on selective catalytic oxidation of NH₃ over CuO/TiO₂ catalysts[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(10): 5123-5130.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I10/5123

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