Novel Enolic Surface Species Formed during Partial Oxidation of CH_3CHO, C_2H_5OH, and C_3H_6 on Ag/Al_2O_3: An in Situ DRIFTS Study

摘要

In situ DRIFTS was used to investigate the formation and reactivity of surface species on Ag/Al_2O_3 during partial oxidation of CH_3CHO, C_2H_5OH, and C_3H_6. The exposure of Ag/Al_2O_3 to CH_3CHO/C_2H_5OH/C_3H_6 + O_2 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_ on Ag/Al_2O_3 than acetate is, and plays a crucial role in the formation of NCO, which is a key intermediate during selective catalytic reduction of NO.