Low-Temperature Selective Catalytic Reduction of NO by CO in the Presence of O2 over Cu:Ce Catalysts Supported by Multiwalled Carbon Nanotubes

• DOI: 10.1021/acs.iecr.8b01343
• Publication Date: 2018-06-08T11:06:37Z
• Authors: Zahra Gholami; Guohua Luo
• Keywords: Carbon fibers; Selective catalytic reduction

The catalytic activity of a series Cu–Ce catalysts supported on carbon nanotubes was studied for NO reduction by CO. 20 wt % Cu1:Ce3/CNT catalyst showed the highest NOx conversion 96% at 220 °C in presence oxygen (O2/CO ≤ 0.6). CNT-supported significantly enhanced due to synergistic interactions between surface vacancies and Cu+ species catalysts. Shifting redox equilibrium right (Cu2+ + Ce3+ ↔ Ce4+) resulted creation more reduced state Cu+. In excess ≥ 0.6), can effectively catalyze CO–O2 reaction CO did not occur. Compared with catalyst, Cu1:Ce3 activated lower Cu+/Cu2+. A possible mechanism proposed, providing insight into reactions