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 O has been demonstrated to have high activity in the low-temperature selective catalytic reduction of NO with NH (NH -SCR). Here, Cu 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 /Cu circulation. After systematic characterization by XPS, H -TPD, and NH -TPR, it is revealed that abundant acidic sites and surface reactive oxygen species are formed on the surface of the catalysts. Further investigation with DRIFTS confirms that the NH -SCR over the as-prepared CuO|Cu O-ASC catalysts simultaneously follows the Langmuir-Hinshelwood (L-H) and Eley-Rideal (E-R) pathways, attributed to the synergistic effects of Cu and Cu .