Catalytic performance and hydrothermal durability of CeO2-V2O5-ZrO2/WO3-TiO2 based NH3-SCR catalysts

Ceria modified V 2 O 5 -ZrO 2 /WO 3 -TiO 2 catalysts with different Ce loading (0, 5, 10 wt%) have been evaluated in the NH 3 -SCR process before and after hydrothermal aging (750 °C, 10 wt% H 2 O/air for 12 h). Compared with only Zr containing catalysts, addition of Ce greatly enhances the low temp...

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Published inCatalysis science & technology Vol. 2; no. 7; pp. 1386 - 1395
Main Authors Wang, Xinquan, Shi, Anju, Duan, Yingfeng, Wang, Jun, Shen, Meiqing
Format Journal Article
LanguageEnglish
Published 01.01.2012
Online AccessGet full text
ISSN2044-4753
2044-4761
DOI10.1039/c2cy20140b

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Abstract Ceria modified V 2 O 5 -ZrO 2 /WO 3 -TiO 2 catalysts with different Ce loading (0, 5, 10 wt%) have been evaluated in the NH 3 -SCR process before and after hydrothermal aging (750 °C, 10 wt% H 2 O/air for 12 h). Compared with only Zr containing catalysts, addition of Ce greatly enhances the low temperature activity of the fresh catalyst, but it deactivates obviously after aging. The catalysts were characterized by XRD, XPS, H 2 -TPR and DRIFTS. The results suggest that not only the enrichment of Ce 3+ and the increased redox properties, but also the more active adsorbed nitrates on CeO 2 modified catalysts benefit the SCR reaction. The catalyst deactivation after aging is mainly due to the sintering and segregation of CeO 2 on the catalysts surface, suggesting the poor hydrothermal stability of the Ce component. However, additional provided NO 2 will compensate for the activity loss due to hydrothermal aging and significantly improve the low temperature SCR activity, suggesting a high NO 2 sensitivity of the Ce component. Moreover, it was found that a ceria, zirconia containing catalyst exhibits superior SCR activities, with both the fresh and aged 1%V 2 O 5 -10%CeO 2 -10%ZrO 2 /WO 3 -TiO 2 catalysts showing high NO x conversions (>95%) and selectivity to N 2 (>98%) in a wide temperature range of 200-500 °C, at a space velocity of 120 000 h −1 in a simulated exhaust containing 500 ppm NO x (NO 2 /NO = 1) and 5% H 2 O. Hydrothermally aged ceria, zirconia containing V 2 O 5 /WO 3 -TiO 2 catalysts exhibit superior SCR activities in NO 2 and H 2 O containing exhaust gases.
AbstractList Ceria modified V 2 O 5 -ZrO 2 /WO 3 -TiO 2 catalysts with different Ce loading (0, 5, 10 wt%) have been evaluated in the NH 3 -SCR process before and after hydrothermal aging (750 °C, 10 wt% H 2 O/air for 12 h). Compared with only Zr containing catalysts, addition of Ce greatly enhances the low temperature activity of the fresh catalyst, but it deactivates obviously after aging. The catalysts were characterized by XRD, XPS, H 2 -TPR and DRIFTS. The results suggest that not only the enrichment of Ce 3+ and the increased redox properties, but also the more active adsorbed nitrates on CeO 2 modified catalysts benefit the SCR reaction. The catalyst deactivation after aging is mainly due to the sintering and segregation of CeO 2 on the catalysts surface, suggesting the poor hydrothermal stability of the Ce component. However, additional provided NO 2 will compensate for the activity loss due to hydrothermal aging and significantly improve the low temperature SCR activity, suggesting a high NO 2 sensitivity of the Ce component. Moreover, it was found that a ceria, zirconia containing catalyst exhibits superior SCR activities, with both the fresh and aged 1%V 2 O 5 -10%CeO 2 -10%ZrO 2 /WO 3 -TiO 2 catalysts showing high NO x conversions (>95%) and selectivity to N 2 (>98%) in a wide temperature range of 200-500 °C, at a space velocity of 120 000 h −1 in a simulated exhaust containing 500 ppm NO x (NO 2 /NO = 1) and 5% H 2 O. Hydrothermally aged ceria, zirconia containing V 2 O 5 /WO 3 -TiO 2 catalysts exhibit superior SCR activities in NO 2 and H 2 O containing exhaust gases.
Author Wang, Xinquan
Wang, Jun
Shen, Meiqing
Shi, Anju
Duan, Yingfeng
AuthorAffiliation State Key Laboratory of Engines
Tianjin University
School of Chemical Engineering & Technology
Key Laboratory for Green Chemical Technology of State Education Ministry
AuthorAffiliation_xml – name: Tianjin University
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Snippet Ceria modified V 2 O 5 -ZrO 2 /WO 3 -TiO 2 catalysts with different Ce loading (0, 5, 10 wt%) have been evaluated in the NH 3 -SCR process before and after...
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Title Catalytic performance and hydrothermal durability of CeO2-V2O5-ZrO2/WO3-TiO2 based NH3-SCR catalysts
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