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@article{c2a3b8e51dda4e5c9ea7ae7abc4a0595,
title = "Optimisation of Ag loading and alumina characteristics to give sulphur-tolerant Ag/Al2O3 catalyst for H2-assisted NH3-SCR of NOx",
keywords = "Ag/Al2O3, NH3, SCR, H2, Sulphur tolerance",
publisher = "Elsevier BV",
author = "Sebastian Fogel and Doronkin, {Dmitry E.} and Pär Gabrielsson and Søren Dahl",
year = "2012",
doi = "10.1016/j.apcatb.2012.06.014",
volume = "125",
pages = "457--464",
journal = "Applied Catalysis B: Environmental",
issn = "0926-3373",

}

RIS

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 -