Toward achieving selective catalytic reduction of NOx by hydrocarbons at low temperatures (especially lower than 200 °C), C2H2 selective reduction of NOx was explored on H-mordenite (H-MOR) catalysts in dielectric barrier discharge (DBD) plasma. This work reported significant synergistic effects of DBD plasmas and H-MOR catalysts for C2H2 selective reduction of NOx at low temperatures (100–200 °C ) and across a wide range of O2 content (0–15%). At 100 °C, NOx conversions were 3.3, 11.6 and 66.7% for the plasma alone, catalyst alone and in-plasma catalysis (IPC) cases (with a reactant gas mixture of 500 ppm NO, 500 ppm C2H2, 10% O2 in N2, GHSV = 12,000 h−1 and input energy density of 125 J L−1), respectively. At 200 °C, NOx conversions were 3.8, 54.0 and 91.4% for the above three cases, respectively. Also, strong signals of hydrogen cyanide (HCN) byproduct were observed in the catalyst alone system by an on-line mass spectrometer. By contrast, almost no HCN was detected in the IPC system.
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This work is supported by National Natural Science Foundation of China (Grant No. 10775028), the National High Technology Research and Development Program (863 Program) of China (Grant No. 2007AA06Z311) and Program for New Century Excellent Talents in University (NCET-06-0282).