Low-temperature SCR activity and SO2 deactivation mechanism of Ce-modified V2O5–WO3/TiO2 catalyst
The promotion effect of ceria modification on the low-temperature activity of V2O5-WO3/TiO2 catalyst was evaluated for the selective catalytic reduction of NO with NH3 (NH3-SCR). The catalytic activity of 1 wt% V2O5-WO3/TiO2 was significantly enhanced by the addition of 8 wt% ceria, which exhibited...
Main Authors: | , , , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
Elsevier
2015-08-01
|
Series: | Progress in Natural Science: Materials International |
Subjects: | |
Online Access: | http://www.sciencedirect.com/science/article/pii/S100200711500074X |
id |
doaj-9fc0549c94064b8f8386a969e6ae2915 |
---|---|
record_format |
Article |
spelling |
doaj-9fc0549c94064b8f8386a969e6ae29152020-11-24T21:04:25ZengElsevierProgress in Natural Science: Materials International1002-00712015-08-0125434235210.1016/j.pnsc.2015.07.002Low-temperature SCR activity and SO2 deactivation mechanism of Ce-modified V2O5–WO3/TiO2 catalystZiran Ma0Xiaodong Wu1Ya Feng2Zhichun Si3Duan Weng4Lei Shi5The Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, ChinaThe Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, ChinaThe Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, ChinaAdvanced Materials Institute, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, ChinaThe Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, ChinaRedbud Innovation Institute, Longyan, Fujian 364000, ChinaThe promotion effect of ceria modification on the low-temperature activity of V2O5-WO3/TiO2 catalyst was evaluated for the selective catalytic reduction of NO with NH3 (NH3-SCR). The catalytic activity of 1 wt% V2O5-WO3/TiO2 was significantly enhanced by the addition of 8 wt% ceria, which exhibited a NOx conversion above 80% in a broad temperature range 190–450 °C. This performance was comparable with 3 wt%V2O5-WO3/TiO2, indicating that the addition of ceria contributed to reducing the usage of toxic vanadia in developing low-temperature SCR catalysts. Moreover, V1CeWTi exhibited approximately 10% decrease in NOx conversion in the presence of 60 ppm SO2. The characterization results indicated that active components of V, W and Ce were well dispersed on TiO2 support. The synergetic interaction between Ce and V species by forming V–O–Ce bridges enhanced the reducibility of VCeWTi catalyst and thus improved the low-temperature activity. The sulfur poisoning mechanism was also presented on a basis of the designed TPDC (temperature-programmed decomposition) and TPSR (temperature-programmed surface reaction) experiments. The deposition of (NH4)2SO4 on V1CeWTi catalyst was much smaller compared with that on V1Ti. On the other hand, the oxidation of SO2 to SO3 was significantly promoted on the CeO2-modified catalyst, accompanied by the formation of cerium sulfates. Therefore, the deactivation of this catalyst was mainly attributed to the vanishing of the V–Ce interaction and the sulfation of active ceria.http://www.sciencedirect.com/science/article/pii/S100200711500074XV2O5-WO3/TiO2CeriaNH3-SCRLow-temperature activitySO2 poisoning |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Ziran Ma Xiaodong Wu Ya Feng Zhichun Si Duan Weng Lei Shi |
spellingShingle |
Ziran Ma Xiaodong Wu Ya Feng Zhichun Si Duan Weng Lei Shi Low-temperature SCR activity and SO2 deactivation mechanism of Ce-modified V2O5–WO3/TiO2 catalyst Progress in Natural Science: Materials International V2O5-WO3/TiO2 Ceria NH3-SCR Low-temperature activity SO2 poisoning |
author_facet |
Ziran Ma Xiaodong Wu Ya Feng Zhichun Si Duan Weng Lei Shi |
author_sort |
Ziran Ma |
title |
Low-temperature SCR activity and SO2 deactivation mechanism of Ce-modified V2O5–WO3/TiO2 catalyst |
title_short |
Low-temperature SCR activity and SO2 deactivation mechanism of Ce-modified V2O5–WO3/TiO2 catalyst |
title_full |
Low-temperature SCR activity and SO2 deactivation mechanism of Ce-modified V2O5–WO3/TiO2 catalyst |
title_fullStr |
Low-temperature SCR activity and SO2 deactivation mechanism of Ce-modified V2O5–WO3/TiO2 catalyst |
title_full_unstemmed |
Low-temperature SCR activity and SO2 deactivation mechanism of Ce-modified V2O5–WO3/TiO2 catalyst |
title_sort |
low-temperature scr activity and so2 deactivation mechanism of ce-modified v2o5–wo3/tio2 catalyst |
publisher |
Elsevier |
series |
Progress in Natural Science: Materials International |
issn |
1002-0071 |
publishDate |
2015-08-01 |
description |
The promotion effect of ceria modification on the low-temperature activity of V2O5-WO3/TiO2 catalyst was evaluated for the selective catalytic reduction of NO with NH3 (NH3-SCR). The catalytic activity of 1 wt% V2O5-WO3/TiO2 was significantly enhanced by the addition of 8 wt% ceria, which exhibited a NOx conversion above 80% in a broad temperature range 190–450 °C. This performance was comparable with 3 wt%V2O5-WO3/TiO2, indicating that the addition of ceria contributed to reducing the usage of toxic vanadia in developing low-temperature SCR catalysts. Moreover, V1CeWTi exhibited approximately 10% decrease in NOx conversion in the presence of 60 ppm SO2. The characterization results indicated that active components of V, W and Ce were well dispersed on TiO2 support. The synergetic interaction between Ce and V species by forming V–O–Ce bridges enhanced the reducibility of VCeWTi catalyst and thus improved the low-temperature activity. The sulfur poisoning mechanism was also presented on a basis of the designed TPDC (temperature-programmed decomposition) and TPSR (temperature-programmed surface reaction) experiments. The deposition of (NH4)2SO4 on V1CeWTi catalyst was much smaller compared with that on V1Ti. On the other hand, the oxidation of SO2 to SO3 was significantly promoted on the CeO2-modified catalyst, accompanied by the formation of cerium sulfates. Therefore, the deactivation of this catalyst was mainly attributed to the vanishing of the V–Ce interaction and the sulfation of active ceria. |
topic |
V2O5-WO3/TiO2 Ceria NH3-SCR Low-temperature activity SO2 poisoning |
url |
http://www.sciencedirect.com/science/article/pii/S100200711500074X |
work_keys_str_mv |
AT ziranma lowtemperaturescractivityandso2deactivationmechanismofcemodifiedv2o5wo3tio2catalyst AT xiaodongwu lowtemperaturescractivityandso2deactivationmechanismofcemodifiedv2o5wo3tio2catalyst AT yafeng lowtemperaturescractivityandso2deactivationmechanismofcemodifiedv2o5wo3tio2catalyst AT zhichunsi lowtemperaturescractivityandso2deactivationmechanismofcemodifiedv2o5wo3tio2catalyst AT duanweng lowtemperaturescractivityandso2deactivationmechanismofcemodifiedv2o5wo3tio2catalyst AT leishi lowtemperaturescractivityandso2deactivationmechanismofcemodifiedv2o5wo3tio2catalyst |
_version_ |
1716771135868108800 |