| Atmospheric Non-Thermal Plasma (ANTP) technology for indoor air treatment has the disadvantage to produce undesirable by-products such as ozone and NOx. To overcome the by-products formation and increasing energy efficiency, ANTP could take advantage of its synergetic effect through combination with heterogeneous catalysts. This combination can be either single-stage (in-plasma catalysis, IPC) or two-stage (post plasma-catalysis, PPC). Various catalysts based on Ag, Au, Cu, Co, Mn, La (supported on OMS-2, Al2O3 or CeO2) and Nb has been investigated with and without a dielectric barrier discharge (DBD). In the absence of catalysts, the toluene removal efficiency was about 60% with O3, CO, CO2, and NOx as reaction products. Without plasma, the reaction of toluene conversion over Al2O3, OMS-2, and perovskite based catalysts are promoted only at high temperature (200-400°C). When the plasma was combined to catalyst at room temperature, the toluene removal efficiency strongly increased when the catalysts are in IPC position. Best results, up to 96% toluene conversion, were obtained when using 1wt%Au/Al2O3 or Nb2O5 catalysts. The products of the toluene oxidation were CO and CO2. |
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1Thien Pham Huu 1, 2
