Novel enolic surface species formed during partial oxidation of CH3CHO, C2H5OH, and C3H6 on Ag/Al2O3:: An in situ DRIFTS study

In situ DRIFTS was used to investigate the formation and reactivity of surface species on Ag/Al2O3 during partial oxidation of CH3CHO, C2H5OH, and C3H6. The exposure of Ag/Al2O3 to CH3CHO/C2H5OH/C3H6 + 02 in a steady state leads to the formation of two kinds of partial oxidation products: acetate and a novel enolic surface species. Peaks at 1633, 1416, and 1336 cm(-1) are assigned to an adsorbed enolic species. The adsorbed enolic species is more prone to react with NO + O-2 on Ag/Al2O3 than acetate is, and plays a crucial role in the formation of NCO, which is a key intermediate during selective catalytic reduction of NO.