Abstract
We studied the dynamic redox behavior of Cu species in zeolite matrix under NH3-SCR using in situ XAFS. Cu2+ species were slowly reduced to Cu+ in flowing NH3, and subsequent addition of NO promoted the reduction to Cu+. In the oxidation step, oxygen alone did not fully oxidize Cu+ to Cu2+, but the Cu+ species were completely oxidized to Cu2+ by NO–O2. The oxidation step was slower than the reduction step, which suggested that the oxidation step (Cu+ → Cu2+) is the slow step of the NH3-SCR reaction.
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