响应面法优化 Mn-Ce/HZSM-5 催化氧化三氯乙烯

Trichloroethylene (TCE) is a widely used industrial raw material, but its emission seriously threatens the ecological environment and human health. How to efficiently remove TCE is still a crucial issue to be solved urgently. In this study, a series of Mn-Ce/HZSM-5 catalysts with different molar ratios of Ce/Mn were prepared by a deposition-precipitation method, and then used for the catalytic oxidation of TCE. The effects of various process parameters on the catalytic performance of the TCE decomposition were investigated using response surface methodology (RSM). The Mn-Ce/HZSM-5 catalyst demonstrated good catalytic activity for TCE decomposition, and MnCe_0.8/HZSM-5 catalyst exhibited the highest catalytic activity due to its high reducibility and abundant surface oxygen species. In addition, the RSM analysis results showed that temperature was the most significant factor affecting the TCE removal efficiency and CO₂ selectivity, followed by the gas flow rate and relative humidity (RH) in catalytic oxidation of TCE by MnCe_0.8/HZSM-5. The best TCE removal efficiency (77.1%) and CO₂ selectivity (70.0%) were acquired at a gas flow rate of 0.2L/min, temperature of 450℃ and RH of 16%. Moreover, the MnCe_0.8/HZSM-5 catalyst also showed good stability. The results provided an effective method for the removal of chlorinated volatile organic compounds.