Ti and Si doping as a way to increase low temperature activity of sulfated Ag/Al2O3 in H2-assisted NH3-SCR of NOx

Dmitry E. Doronkin; Sebastian Fogel; Pär Gabrielsson; Jan-Dierk Grunwaldt; Søren Dahl

doi:10.1016/j.apcatb.2013.10.040

Ti and Si doping as a way to increase low temperature activity of sulfated Ag/Al₂O₃ in H₂-assisted NH₃-SCR of NO_x

Dmitry E. Doronkin, Sebastian Fogel, Pär Gabrielsson, Jan-Dierk Grunwaldt, Søren Dahl

Haldor Topsoe AS

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

Ag/Al₂O₃ catalysts modified by Si, Ti, Mg and W were studied to obtain higher NO_x SCR activity and potentially also higher SO2 resistance than the pure silver-based catalyst for automotive applications. Addition of Ti or Si to the alumina support leads to a better NOx removal at low temperature i.e. reduces the SCR onset temperature by about 10°C under the applied conditions. However, it does not increase the SO2 resistance. The catalysts and the supports have been characterized by BET, conventional and synchrotron XRD, X-ray absorption spectroscopy during temperature-programmed reduction (XAS-TPR) and temperature-programmed desorption of ammonia (NH₃-TPD). The obtained results suggest a better silver dispersion and better regeneration capability in the case of Ti- and Si-modified Ag/Al₂O₃ catalysts.

Original language	English
Journal	Applied Catalysis B: Environmental
Volume	148-149
Pages (from-to)	62-69
ISSN	0926-3373
DOIs	https://doi.org/10.1016/j.apcatb.2013.10.040
Publication status	Published - 2013

Keywords

Alumina
Catalyst regeneration
Doping (additives)
Silicon
Silver
Sulfur dioxide
Temperature
Temperature programmed desorption
X ray absorption spectroscopy
Catalyst supports

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10.1016/j.apcatb.2013.10.040

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@article{005d2f3c9b6d4cfe935e688f433b4a00,

title = "Ti and Si doping as a way to increase low temperature activity of sulfated Ag/Al2O3 in H2-assisted NH3-SCR of NOx",

abstract = "Ag/Al2O3 catalysts modified by Si, Ti, Mg and W were studied to obtain higher NOx SCR activity and potentially also higher SO2 resistance than the pure silver-based catalyst for automotive applications. Addition of Ti or Si to the alumina support leads to a better NOx removal at low temperature i.e. reduces the SCR onset temperature by about 10°C under the applied conditions. However, it does not increase the SO2 resistance. The catalysts and the supports have been characterized by BET, conventional and synchrotron XRD, X-ray absorption spectroscopy during temperature-programmed reduction (XAS-TPR) and temperature-programmed desorption of ammonia (NH3-TPD). The obtained results suggest a better silver dispersion and better regeneration capability in the case of Ti- and Si-modified Ag/Al2O3 catalysts.",

keywords = "Alumina, Catalyst regeneration, Doping (additives), Silicon, Silver, Sulfur dioxide, Temperature, Temperature programmed desorption, X ray absorption spectroscopy, Catalyst supports",

author = "Doronkin, {Dmitry E.} and Sebastian Fogel and P{\"a}r Gabrielsson and Jan-Dierk Grunwaldt and S{\o}ren Dahl",

year = "2013",

doi = "10.1016/j.apcatb.2013.10.040",

language = "English",

volume = "148-149",

pages = "62--69",

journal = "Applied Catalysis B: Environmental",

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T1 - Ti and Si doping as a way to increase low temperature activity of sulfated Ag/Al2O3 in H2-assisted NH3-SCR of NOx

AU - Doronkin, Dmitry E.

AU - Fogel, Sebastian

AU - Gabrielsson, Pär

AU - Grunwaldt, Jan-Dierk

AU - Dahl, Søren

PY - 2013

Y1 - 2013

N2 - Ag/Al2O3 catalysts modified by Si, Ti, Mg and W were studied to obtain higher NOx SCR activity and potentially also higher SO2 resistance than the pure silver-based catalyst for automotive applications. Addition of Ti or Si to the alumina support leads to a better NOx removal at low temperature i.e. reduces the SCR onset temperature by about 10°C under the applied conditions. However, it does not increase the SO2 resistance. The catalysts and the supports have been characterized by BET, conventional and synchrotron XRD, X-ray absorption spectroscopy during temperature-programmed reduction (XAS-TPR) and temperature-programmed desorption of ammonia (NH3-TPD). The obtained results suggest a better silver dispersion and better regeneration capability in the case of Ti- and Si-modified Ag/Al2O3 catalysts.

AB - Ag/Al2O3 catalysts modified by Si, Ti, Mg and W were studied to obtain higher NOx SCR activity and potentially also higher SO2 resistance than the pure silver-based catalyst for automotive applications. Addition of Ti or Si to the alumina support leads to a better NOx removal at low temperature i.e. reduces the SCR onset temperature by about 10°C under the applied conditions. However, it does not increase the SO2 resistance. The catalysts and the supports have been characterized by BET, conventional and synchrotron XRD, X-ray absorption spectroscopy during temperature-programmed reduction (XAS-TPR) and temperature-programmed desorption of ammonia (NH3-TPD). The obtained results suggest a better silver dispersion and better regeneration capability in the case of Ti- and Si-modified Ag/Al2O3 catalysts.

KW - Alumina

KW - Catalyst regeneration

KW - Doping (additives)

KW - Silicon

KW - Silver

KW - Sulfur dioxide

KW - Temperature

KW - Temperature programmed desorption

KW - X ray absorption spectroscopy

KW - Catalyst supports

U2 - 10.1016/j.apcatb.2013.10.040

DO - 10.1016/j.apcatb.2013.10.040

M3 - Journal article

SN - 0926-3373

VL - 148-149

SP - 62

EP - 69

JO - Applied Catalysis B: Environmental

JF - Applied Catalysis B: Environmental

ER -