改性镍铝催化剂氧化零价汞及抗氨干扰机理

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Abstract NiAlO and NiAlMO (M=Zn、Ba、Mn、La、Cr) catalysts were prepared to evaluate the efficiency of Hg⁰ oxidation of NiAlZnO catalyst using urea hydrolyzation, Raman and XPS experiments, etc. The results indicate that NiAlZnO catalyst exhibited the highest Hg⁰ oxidation activity in the presence of NH₃ and the Hg⁰ oxidation efficiency of NiAlZnO catalyst was above 80% at 250℃ and reached 90% at 350℃. Doping Zn enabled the NiAlZnO catalyst to form Ni-O-Zn solid solution and generate Jahn-Teller distortions which could increase the content of surface chemisorbed oxygen and promote the activation of O₂, and thus increase the surface chemisorption oxygen content of catalyst. The incorporation of Zn could improve the redox and Hg⁰ adsorption performance of NiAlZnO catalyst, even in the presence of NH₃. NH₃-TPD and NH₃-DRIFT experiments also proved that the addition of Zn introduced the new Hg⁰ adsorption site (B acid site) for NiAlZnO catalyst. Obviously, NiAlZnO catalyst can greatly promote Hg⁰ oxidation and possesses the resistance to NH₃ interference.

Key words： NiAlZnO catalyst Hg⁰ oxidation Hg⁰ adsorption anti-NH₃ interference

Received: 03 June 2021

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X505

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	QIU Lei
	GUO Lei
	HAN Jin-chi
	YU Jie
	CHANG Hua-zhen

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QIU Lei,GUO Lei,HAN Jin-chi等. Hg⁰ oxidation of modified Ni-Al catalysts and its anti-ammonia interference mechanism[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(1): 11-19.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I1/11

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