Vapor Phase Catalytic Degradation Studies of Diethyl Sulfide with MnO/Zeolite-13X Catalysts in Presence of Air

摘要

Vapor phase catalytic degradation of diethyl sulfide (DES) (simulant of sulfur mustard: a potential chemical warfare agent) at higher concentration (～1200 ppm) was carried out in a fixed bed flow reactor over MnO/zeolite-13X catalysts of different manganese contents. The catalytic process was studied in the temperature range of 100-400℃ with air as the oxidizing agent. Process parameters such as reaction temperature, metal content, gas hourly space velocity, and RH% were optimized for 100% degradation of DES vapors. Reaction temperature and RH% has significant influence over the activity and stability of MnO/zeolite-13X catalyst. The major degradation products identified are carbon oxides, ethylene, acetaldehyde, and sulfur dioxide. 'Traces of diethyl sulfoxide and diethyl sul-fone, CSO, ethanol, thioethanol, methane thiol, acetic acid, formic acid, and thiophene are also identified in GC-MS analyses. The plausible degradation pathway of DES is also proposed based on the analyses results. The MnO/zeolite-13X catalysts of different compositions are prepared by wet impregnation method and characterized by different characterization techniques.