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Deactivation of Pt/Wire-Mesh and Vanadia/Monolith Catalysts Applied in Selective Catalytic Reduction of NOx in Flue Gas

Sohrabi, Morteza; Moradi, Farokhbag and Sanati, Mehri LU (2007) In Korean Journal of Chemical Engineering 24(4). p.583-587
Abstract
In this study the deactivation of Pt/wire mesh and vanadia/monolith catalysts by aerosol particles of some inorganic salts (K2SO4, KCl and ZnCl2) with high or low melting points has been investigated. The aerosol particles may either diffuse within the matrix of the catalysts and block the mezzo and micro pores, or deposit on the outer surface of the catalysts and form a porous layer causing a mass transfer resistance that ultimately deactivates the catalysts. It has been observed that in both Pt/wire mesh and vanadia/monolith catalysts the deactivation effect of ZnCl2 was more pronouced compared to other salts. As an example, after 31 hours of exposure to ZnCl2, 10% of the catalysts activities was lost. This may be related to the ZnCl2... (More)
In this study the deactivation of Pt/wire mesh and vanadia/monolith catalysts by aerosol particles of some inorganic salts (K2SO4, KCl and ZnCl2) with high or low melting points has been investigated. The aerosol particles may either diffuse within the matrix of the catalysts and block the mezzo and micro pores, or deposit on the outer surface of the catalysts and form a porous layer causing a mass transfer resistance that ultimately deactivates the catalysts. It has been observed that in both Pt/wire mesh and vanadia/monolith catalysts the deactivation effect of ZnCl2 was more pronouced compared to other salts. As an example, after 31 hours of exposure to ZnCl2, 10% of the catalysts activities was lost. This may be related to the ZnCl2 lower melting point in comparison with other poisons. These results are in agreement with the previous findings for deactivation of wire-mesh catalysts used for oxidation of volatile organic compounds (VOC) and CO by exposing the catalysts to the aerosols generated from inorganic salts. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
SCR, pt/wire mesh, vanadia/moolith, aerosol, deactivation, sub-micron particles
in
Korean Journal of Chemical Engineering
volume
24
issue
4
pages
583 - 587
publisher
Springer
external identifiers
  • scopus:36949029861
ISSN
0256-1115
DOI
10.1007/s11814-007-0006-x
language
English
LU publication?
yes
id
bec3320f-0798-490c-a181-f59e64c2cd48 (old id 1952105)
date added to LUP
2011-05-12 15:10:33
date last changed
2017-01-01 07:56:38
@article{bec3320f-0798-490c-a181-f59e64c2cd48,
  abstract     = {In this study the deactivation of Pt/wire mesh and vanadia/monolith catalysts by aerosol particles of some inorganic salts (K2SO4, KCl and ZnCl2) with high or low melting points has been investigated. The aerosol particles may either diffuse within the matrix of the catalysts and block the mezzo and micro pores, or deposit on the outer surface of the catalysts and form a porous layer causing a mass transfer resistance that ultimately deactivates the catalysts. It has been observed that in both Pt/wire mesh and vanadia/monolith catalysts the deactivation effect of ZnCl2 was more pronouced compared to other salts. As an example, after 31 hours of exposure to ZnCl2, 10% of the catalysts activities was lost. This may be related to the ZnCl2 lower melting point in comparison with other poisons. These results are in agreement with the previous findings for deactivation of wire-mesh catalysts used for oxidation of volatile organic compounds (VOC) and CO by exposing the catalysts to the aerosols generated from inorganic salts.},
  author       = {Sohrabi, Morteza and Moradi, Farokhbag and Sanati, Mehri},
  issn         = {0256-1115},
  keyword      = {SCR,pt/wire mesh,vanadia/moolith,aerosol,deactivation,sub-micron particles},
  language     = {eng},
  number       = {4},
  pages        = {583--587},
  publisher    = {Springer},
  series       = {Korean Journal of Chemical Engineering},
  title        = {Deactivation of Pt/Wire-Mesh and Vanadia/Monolith Catalysts Applied in Selective Catalytic Reduction of NOx in Flue Gas},
  url          = {http://dx.doi.org/10.1007/s11814-007-0006-x},
  volume       = {24},
  year         = {2007},
}