Spatially resolved XAS studies for elucidating the role of catalyst composition on the noble metal state during NOx-removal by SCR with H2

For decreasing greenhouse gas emissions, i.e. CO2, the use of hydrogen as C-free fuel for lean-burn internal combustion engines is regarded as a promising alternative. For such applications, NOx emissions are the only pollutant requiring catalytic aftertreatment. This study aims at understanding the impact of catalyst composition on the behaviour on Pt and Pd active species during selective catalytic reduction of NOx by H2. For this purpose, a series of noble metal (NM)/CeO2 catalysts containing WO3 or BaO as dopants, will be investigated by spatially resolved operando XAS measurements along the catalyst bed at Pt L3 and Pd K edges.