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- W2077019657 abstract "The role of hydrogen in promoting the reduction by ammonia of NOx on silver catalysts has been investigated using a Short Time on Stream (STOS) technique to allow differentiation between potentially reactive intermediates and relatively inactive spectator species. Under these conditions, we have used DRIFTS to identify surface nitrate species that are formed and removed on a timescale of seconds. This is in contrast to nitrate species observed under normal steady-state conditions which can continue to form over many tens of minutes. Since this timescale of seconds is very similar to the response rate at which the NH3/NOx to N2 reaction is accelerated when H2 is added, or decelerated when H2 is removed, we conclude that this fast-forming and fast disappearing nitrate species is most probably adsorbed on or close to the active Ag sites. The removal of such a blocking nitrate species from the active sites can explain the effect of H2 in greatly increasing the rate of the overall de-NOx reaction." @default.
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- W2077019657 date "2012-11-01" @default.
- W2077019657 modified "2023-10-16" @default.
- W2077019657 title "The use of Short Time on Stream (STOS) transient kinetics to investigate the role of hydrogen in enhancing NOx reduction over silver catalysts" @default.
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- W2077019657 doi "https://doi.org/10.1016/j.jcat.2012.08.015" @default.
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