Optimisation of Ag loading and alumina characteristics to give sulphur-tolerant Ag/Al2O3 catalyst for H2-assisted NH3-SCR of NOx
Publication: Research - peer-review › Journal article – Annual report year: 2012
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Optimisation of Ag loading and alumina characteristics to give sulphur-tolerant Ag/Al2O3 catalyst for H2-assisted NH3-SCR of NOx. / Fogel, Sebastian; Doronkin, Dmitry E.; Gabrielsson, Pär; Dahl, Søren.
In: Applied Catalysis B: Environmental, Vol. 125, 2012, p. 457-464.Publication: Research - peer-review › Journal article – Annual report year: 2012
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TY - JOUR
T1 - Optimisation of Ag loading and alumina characteristics to give sulphur-tolerant Ag/Al<sub>2</sub>O<sub>3</sub> catalyst for H<sub>2</sub>-assisted NH<sub>3</sub>-SCR of NO<sub>x</sub>
A1 - Fogel,Sebastian
A1 - Doronkin,Dmitry E.
A1 - Gabrielsson,Pär
A1 - Dahl,Søren
AU - Fogel,Sebastian
AU - Doronkin,Dmitry E.
AU - Gabrielsson,Pär
AU - Dahl,Søren
PB - Elsevier BV
PY - 2012
Y1 - 2012
N2 - <p>A series of Ag/Al<sub>2</sub>O<sub>3</sub> catalysts with different alumina precursors and different Ag loadings were tested for H<sub>2</sub> assisted NH<sub>3</sub>-SCR of NO. The catalysts were characterised (BET, XRD, NH<sub>3</sub>-TPD, ICP-OES, TEM and UV–vis spectroscopy) and tested as fresh catalyst, during long-term cycling tests with SO<sub>2</sub> present and after the sulphur testing. The aim was to find an optimal configuration of the Ag/Al<sub>2</sub>O<sub>3</sub> catalyst for automotive applications. Catalysts with a high sulphur tolerance during long-term SO<sub>2</sub> cycling (1h with 10ppm SO<sub>2</sub> at 250°C followed by 10min regeneration at 670°C, repeated until no difference between cycles was seen) were demonstrated. The high sulphur tolerance and activity was attributed to high surface areas of the catalyst supports, together with a high Ag loading. The high surface area allows a larger NH<sub>3</sub> storage on the surface which is previously reported necessary for the SCR reaction. A higher Ag loading will affect the state of Ag by increasing the ratio of Ag-clusters and particles to highly dispersed Ag ions. SO<sub>2</sub>-poisoned Ag-clusters and particles can be regenerated by the high temperature treatment in the deNO<sub>x</sub> feed, highly dispersed Ag ions cannot.</p>
AB - <p>A series of Ag/Al<sub>2</sub>O<sub>3</sub> catalysts with different alumina precursors and different Ag loadings were tested for H<sub>2</sub> assisted NH<sub>3</sub>-SCR of NO. The catalysts were characterised (BET, XRD, NH<sub>3</sub>-TPD, ICP-OES, TEM and UV–vis spectroscopy) and tested as fresh catalyst, during long-term cycling tests with SO<sub>2</sub> present and after the sulphur testing. The aim was to find an optimal configuration of the Ag/Al<sub>2</sub>O<sub>3</sub> catalyst for automotive applications. Catalysts with a high sulphur tolerance during long-term SO<sub>2</sub> cycling (1h with 10ppm SO<sub>2</sub> at 250°C followed by 10min regeneration at 670°C, repeated until no difference between cycles was seen) were demonstrated. The high sulphur tolerance and activity was attributed to high surface areas of the catalyst supports, together with a high Ag loading. The high surface area allows a larger NH<sub>3</sub> storage on the surface which is previously reported necessary for the SCR reaction. A higher Ag loading will affect the state of Ag by increasing the ratio of Ag-clusters and particles to highly dispersed Ag ions. SO<sub>2</sub>-poisoned Ag-clusters and particles can be regenerated by the high temperature treatment in the deNO<sub>x</sub> feed, highly dispersed Ag ions cannot.</p>
KW - Ag/Al2O3
KW - NH3
KW - SCR
KW - H2
KW - Sulphur tolerance
U2 - 10.1016/j.apcatb.2012.06.014
DO - 10.1016/j.apcatb.2012.06.014
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
SN - 0926-3373
VL - 125
SP - 457
EP - 464
ER -