Ce掺杂改性Ni-Al-O<sub><em>x</em></sub>催化剂CO-NO反应性能

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Abstract

A series of Ce-doped Ni-Al-O_x catalysts were prepared by a urea-hydrolysis method, and were applied for CO-NO reaction. The results showed that Ce-doped Ni-Al-O_x exhibited much higher NO conversions than Ni-Al-O_x. Furthermore, the activity increased with the raising of Ce doping ratio. More than 95% NO could be converted at temperature as low as 250℃ over NiAlCe₃₀O and NiAlCe₂₀O. These catalysts also showed excellent resistance to H₂O. Ce-doped Ni-Al-O_x catalysts were characterized by XRD, N₂ physisorption, Raman, XPS, H₂-TPR, NO-TPD, and in situ DRIFTs. XRD and Raman results showed that Ni-Ce-O solid solution was formed in Ni-Al-Ce-O_xcatalyst. Meanwhile, oxygen vacancies increased with the increasing of Ce doping ratio. H₂-TPR results indicated that the redox ability was improved by Ce doping. NO-TPD and in situ DRIFTs results revealed that the increasing number of oxygen vacancies resulted from Ce doping were beneficial to the dissociation of NO to N₂ or N₂O rather than the oxidation of NO to nitrates.

Key words： Ni-Al-Ce-O_x CO-NO oxygen vacancy Ce-doped

Received: 05 March 2018

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	GUO Lei
	ZHANG Tao
	CHANG Hua-zhen
	LI Jun-hua

Cite this article:

GUO Lei,ZHANG Tao,CHANG Hua-zhen等. Study on Ce-doped Ni-Al-O_x catalysts for NO reduction by CO[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(9): 3313-3321.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I9/3313

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