Post Plasma Catalysis for the Removal of Acetaldehyde Using Mn-Co/HZSM-5 Catalysts

A system combining nonthermal plasma (NTP) and catalysis using Mn-Co/HZSM-5 catalyst has been developed to promote the oxidation of acetaldehyde and reduce the production of ozone. The introduction of catalyst improved the oxidation of acetaldehyde and inhibited the generation of O-3 in comparison with the NTP alone system. The mixed MnCo/HZSM-5 catalyst demonstrated the highest catalytic activity among the various prepared catalysts, and this was ascribed to its crystalline structure, redox property, and adsorbed surface oxygen of the catalyst. The removal efficiency of acetaldehyde and COx yield were positively associated with the specific energy density (SED), and they were inversely related to the gas flow rate. Nevertheless, the energy yield was in negative correlation with the SED and in positive association with the gas flow rate. Moreover, the impact of different catalysts on the acceleration of acetaldehyde degradation in the hybrid system was discussed by developing a simple kinetic model.