Generation of multi-valence Cu(x)O by reduction with activated semi-coke and their collaboration in the selective reduction of NO with NH(3)

Multi-valence Cu(x)O has been demonstrated to have high activity in the low-temperature selective catalytic reduction of NO(x) with NH(3) (NH(3)-SCR). Here, Cu(x)O was loaded onto activated semi-coke (ASC) for SCR, which has shown satisfactory low-temperature SCR activity. By virtue of the reduction property of carbon, the valence of Cu was regulated by simply adjusting the calcination temperature. The high concentration of Cu(+) generated from the reduction of CuO by ASC during calcination can collaborate to form Cu(2+)/Cu(+) circulation. After systematic characterization by XPS, H(2)-TPD, and NH(3)-TPR, it is revealed that abundant acidic sites and surface reactive oxygen species are formed on the surface of the catalysts. Further investigation with in situ DRIFTS confirms that the NH(3)-SCR over the as-prepared CuO|Cu(2)O-ASC catalysts simultaneously follows the Langmuir–Hinshelwood (L–H) and Eley–Rideal (E–R) pathways, attributed to the synergistic effects of Cu(2+) and Cu(+).