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Surface acid property and its relation to SCR activity of phosphorus added to commercial V2O5(WO3)/TiO2 catalyst

Kamata, H; Takahashi, K and Odenbrand, Ingemar LU (1998) In Catalysis Letters 53(1-2). p.65-71
Abstract
To examine the influence of phosphorus on the commercial V2O5(WO3)/TiO2 SCR catalyst, measurements were carried out by means of infrared and Raman spectroscopy, XPS, and NO reduction measurement as a function of phosphorus loading. Phosphorus added to the catalyst was found to disperse well over the catalyst without a significant agglomeration up to 5 wt% P2O5 addition. The number of the hydroxyl groups bonded to the vanadium and titanium species decreased readily with increasing amount of phosphorus. Correspondingly the hydroxyl groups bonded to the phosphorus species were formed. NH3 adsorbed on both hydroxyl groups bonded to vanadium and phosphorus as ammonium ions, implying that the P-OH groups formed are also responsible for the... (More)
To examine the influence of phosphorus on the commercial V2O5(WO3)/TiO2 SCR catalyst, measurements were carried out by means of infrared and Raman spectroscopy, XPS, and NO reduction measurement as a function of phosphorus loading. Phosphorus added to the catalyst was found to disperse well over the catalyst without a significant agglomeration up to 5 wt% P2O5 addition. The number of the hydroxyl groups bonded to the vanadium and titanium species decreased readily with increasing amount of phosphorus. Correspondingly the hydroxyl groups bonded to the phosphorus species were formed. NH3 adsorbed on both hydroxyl groups bonded to vanadium and phosphorus as ammonium ions, implying that the P-OH groups formed are also responsible for the Bronsted acidity. The NO reduction activity was found to be decreased with increasing amount of phosphorus; however, the influence of phosphorus was relatively small irrespective of the large amount of phosphorus addition. The deactivation might be caused by the change in the nature of the surface hydroxyl groups as Bronsted acid sites. Phosphorus species might partially wrap the surface V=O and W=O groups, which might also contribute to the deactivation. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
selective catalytic reduction, nitric oxide reduction, phosphorus, acid, property
in
Catalysis Letters
volume
53
issue
1-2
pages
65 - 71
publisher
Springer
external identifiers
  • wos:000075073000011
  • scopus:0009557110
ISSN
1011-372X
DOI
10.1023/A:1019020931117
language
English
LU publication?
yes
id
eaaf270f-905c-4ba4-ae82-ccca87b541e2 (old id 3916358)
date added to LUP
2013-07-02 14:13:02
date last changed
2017-07-30 03:51:52
@article{eaaf270f-905c-4ba4-ae82-ccca87b541e2,
  abstract     = {To examine the influence of phosphorus on the commercial V2O5(WO3)/TiO2 SCR catalyst, measurements were carried out by means of infrared and Raman spectroscopy, XPS, and NO reduction measurement as a function of phosphorus loading. Phosphorus added to the catalyst was found to disperse well over the catalyst without a significant agglomeration up to 5 wt% P2O5 addition. The number of the hydroxyl groups bonded to the vanadium and titanium species decreased readily with increasing amount of phosphorus. Correspondingly the hydroxyl groups bonded to the phosphorus species were formed. NH3 adsorbed on both hydroxyl groups bonded to vanadium and phosphorus as ammonium ions, implying that the P-OH groups formed are also responsible for the Bronsted acidity. The NO reduction activity was found to be decreased with increasing amount of phosphorus; however, the influence of phosphorus was relatively small irrespective of the large amount of phosphorus addition. The deactivation might be caused by the change in the nature of the surface hydroxyl groups as Bronsted acid sites. Phosphorus species might partially wrap the surface V=O and W=O groups, which might also contribute to the deactivation.},
  author       = {Kamata, H and Takahashi, K and Odenbrand, Ingemar},
  issn         = {1011-372X},
  keyword      = {selective catalytic reduction,nitric oxide reduction,phosphorus,acid,property},
  language     = {eng},
  number       = {1-2},
  pages        = {65--71},
  publisher    = {Springer},
  series       = {Catalysis Letters},
  title        = {Surface acid property and its relation to SCR activity of phosphorus added to commercial V2O5(WO3)/TiO2 catalyst},
  url          = {http://dx.doi.org/10.1023/A:1019020931117},
  volume       = {53},
  year         = {1998},
}