Investigation of a new approach to decompose two potent greenhouse gases: Photoreduction of SF_6 and SF_5CF_3 in the presence of acetone

摘要

In this paper, we addressed the utilization of photochemical method as an innovative technology for the destruction and removal of two potent greenhouse gases, SF_6 and SF_5CF_3. The destruction and removal efficiency (DRE) of the process was determined as a function of excitation wavelength, irradiation time, initial ratio of acetone to SF_5X (X represented F or CF_3), initial SF_5X concentration, additive oxygen and water vapor concentration. A complete removal was achieved by a radiation period of 55 min and 120 min for SF_6-CH_3COCH_3 system and SF_5CF_3-CH_3COCH_3 system respectively under 184.9 nm irradiation. Extra addition of water vapor can enhance DRE by approximately 6% points in both systems. Further studies with GC/MS and FT-IR proved that no hazardous products such as S_2F_(10), SO_2F_2, SOF_2, SOF_4 were generated in this process.