Ce改性钒磷氧催化剂的制备及其脱硝性能研究

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Abstract

In this paper, the surface acidity and the closely related microstructure of supported vanadium phosphate (VPO/TiO₂) were adjusted by Ce. The denitration performance of VPO-Ce/TiO₂ was also investigated. The results showed that when the P/V was 1/3, the Ce/V 1/4, the loading of active component 10% and the calcination temperature 400℃, the activity of denitrifying catalyst functioned the best with a de-NO_x rate above 96% at temperature range of 250~350℃. The BET results showed that the specific surface area of 0.1VP(0.33)O-Ce(0.25)/TiO₂ is 10.74m²/g and it was 58.6% higher than that of 0.1VP(0.33)O/TiO₂. The mole ratio of chemisorbed oxygen (O_α) and lattice oxygen (O_β) O_α/O_β of 0.1VP(0.33)O/TiO₂ was 72% and the O_α/O_β increased to 85% after Ce doping. Moreover, Ce doping could promote the formation of adjacent V⁵⁺ and V⁴⁺ and improve the redox performance of catalysts. Ce doping had a great effect on the surface acidity of catalyst and the intensity of Brønsted acidity of catalyst was highest when Ce/V is 1/4, which was consistent with the activity test. With 200x10^-6 SO₂ and 4vol.% water vapor in the feed gas, the denitration activity of 0.1VP(0.33)O-Ce(0.25)/TiO₂ dropped by 20% at most at temperature of 150~300℃ and it hardly decreased when the temperature was above 300℃. There was no sulfate generated on the 0.1VP(0.33)O-Ce(0.25)/TiO₂ after the activity test and the catalyst showed excellent resistance ability to SO₂ and water vapor.

Key words： SCR denitration VPO catalyst Ce doping

Received: 25 May 2018

PACS:

X511

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	Articles by authors
	DAI Bo
	ZHANG Song
	GU Ming-yan
	CHEN Yong
	JIA Yong
	SHI De-ming
	XIA Yong-jun
	Hu Jia

Cite this article:

DAI Bo,ZHANG Song,GU Ming-yan等. Preparation of supported VPO catalyst modified by Ce and the investigation of its denitration performance[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(1): 126-133.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I1/126

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