NDLI: Hydrothermal Stability of CeO2-WO3-ZrO2 Mixed Oxides for Selective Catalytic Reduction of NOx by NH3.

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Hydrothermal Stability of CeO2-WO3-ZrO2 Mixed Oxides for Selective Catalytic Reduction of NOx by NH3.

Content Provider	Semantic Scholar
Author	Liu, Jingjing Shi, Xiaoyan Shan, Yulong Yan, Zidi Shan, Wenpo Yu, Yunbo
Copyright Year	2018
Abstract	CeO2-WO3-ZrO2 mixed oxides were prepared by the homogeneous precipitation method for the selective catalytic reduction of NOx with NH3 (NH3-SCR). The effects of hydrothermal aging on the catalytic performances of CeO2-WO3-ZrO2 were investigated. The results showed that CeO2-WO3-ZrO2 catalyst exhibited excellent NH3-SCR activity for removal of NOx and hydrothermal stability. After hydrothermal aging at 850 °C for 16 h, the optimum CeO2-WO3-ZrO2 catalyst could still realize 80% NOx conversion at 300-500 °C even under a high gas hourly space velocity of 250 000 h-1. The structural properties, redox ability, surface species, and acidity of fresh and hydrothermally aged CeO2-WO3-ZrO2 catalysts were characterized by N2-physisorption, XRD, Raman, H2-TPR, XPS, NH3-TPD, and in situ DRIFTS. The characterization results showed that decreases of 89% of the surface area and 71% of the NH3 storage capacity as well as new phase formation occurred for the CeO2-WO3-ZrO2 sample after hydrothermal aging at 850 °C for 16 h. The activity of hydrothermally aged CeO2-WO3-ZrO2 was mainly attributed to the retention of redox-acid sites and their interaction due to the formation of Ce-Zr solid solutions and Ce4W9O33.
Starting Page	11769
Ending Page	11777
Page Count	9
File Format	PDF HTM / HTML
DOI	10.1021/acs.est.8b03732
PubMed reference number	30207708
Journal	Medline
Volume Number	52
Issue Number	20
Alternate Webpage(s)	http://hehong.rcees.ac.cn/bookpic/20198914475195087.pdf
Alternate Webpage(s)	https://doi.org/10.1021/acs.est.8b03732
Journal	Environmental science & technology
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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