Abstract
Abstract The mechanism of phosphotungstic acid modification CeO 2 catalysts (P-W/CeO 2 ) with different CeO 2 supports were investigated by in situ diffuse reflectance infrared transform spectroscopy for the selective catalytic reduction of NO by NH 3 . The results indicated that the NH 3 -SCR reaction over P-W/CeO 2 followed both the Langmuir–Hinshelwood mechanism and the Eley–Rideal mechanism. The reaction between NH 4 + and bidentate nitrate (NO 3 − ) took place, and then the H 2 O, N 2 and adsorbed NO 2 were formed. The coordinated NH 3 species reacted with adsorbed NO 2 and gaseous NO to generate N 2 and H 2 O. The interaction between CeO 2 and phosphotungstic acid contributed to the favored surface acidity (Lewis and Bronsted acid sites) and excellent redox property. The Bronsted acid sites facilitated the generation of NO 2 -adsorbed and Lewis acid sites accelerated the Eley–Rideal mechanism, while the NO oxidation to bidentate nitrate or NO 2 -adsorbed species was an important step in the reaction mechanism of P-W/CeO 2 .
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