The co-effect of Sb and Nb on the SCR performance of the V2O5/TiO2 catalyst

[Display omitted] ► Both Nb and Sb can increase the activity of V2O5/TiO2 catalyst, and Nb can improve the N2 selectivity. ► The co-doping of Sb and Nb showed higher improving effect than the single doping of Sb or Nb. ► The SbNb co-doped V2O5/TiO2 catalyst had a better H2O resistance than the V2O5/...

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Bibliographic Details
Published in:Journal of colloid and interface science 2012-02, Vol.368 (1), p.406-412
Main Authors: Du, Xuesen, Gao, Xiang, Fu, Yincheng, Gao, Feng, Luo, Zhongyang, Cen, Kefa
Format: Article
Language:English
Subjects:
acidity
additives
ammonia
Antimony
Catalysis
Catalysts
Chemistry
Exact sciences and technology
General and physical chemistry
NH3
Niobium
nitric oxide
nitrogen
poisoning
Selective catalytic reduction
Surface chemistry
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Titanium dioxide
Transmission electron microscopy
V2O5
Vanadium pentoxide
X-ray diffraction
X-ray photoelectron spectroscopy
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Summary:[Display omitted] ► Both Nb and Sb can increase the activity of V2O5/TiO2 catalyst, and Nb can improve the N2 selectivity. ► The co-doping of Sb and Nb showed higher improving effect than the single doping of Sb or Nb. ► The SbNb co-doped V2O5/TiO2 catalyst had a better H2O resistance than the V2O5/TiO2 catalyst. ► The presence of SO2 could improve the activity of SbNb-doped catalyst at the absence of water vapor. The effect of the Sb and Nb additives on the V2O5/TiO2 catalyst for the selective catalytic reduction (SCR) of NO with NH3 was investigated. The experimental results show that either Nb or Sb can improve the activity of V2O5/TiO2 catalyst. Higher Nb loading led to higher N2 selectivity. The co-doping of Sb and Nb showed higher improving effect than the single doping of Sb or Nb. The V2O5/TiO2 catalyst doped with Sb and Nb had a better H2O resistance than the V2O5/TiO2 catalyst. The addition of Sb and Nb also enhance the resistance of the V2O5/TiO2 catalyst to K2O poisoning. The catalysts were characterized by BET, XRD, TEM, and XPS. The results showed that the active components of V, Sb, and Nb were well interacting with each other. The coexistence of Sb and Nb will enhance the redox ability and surface acidity and thus promote the SCR performance.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2011.11.026