Enhanced Catalytic Performance and Poison Resistance of Cu-Mn-Ce Ternary Mixed Oxide for Chlorobenzene Oxidation

Cu-Mn-Ce ternary mixed oxides, prepared via the citric acid complex method and supported on cordierite, were investigated for their catalytic activity in the oxidation of chlorobenzene. The impact of various reaction conditions, including chlorobenzene concentration, GHSV, water vapor and HCl, was thoroughly investigated to analyze oxidative activity, stability, and anti-poisoning ability. Among the catalysts tested, those with 20 wt% CuMnOx and 10 wt% CeO2, calcined at 450 degrees C for 4 h with one step, exhibited the highest apparent activity with T-90 < 300 degrees C in the feed containing 500ppm chlorobenzene at a space velocity of 10,000 h(-1). Notably, Cu-Mn-Ce-O exhibited a stable and effective catalyst performance for the oxidation of chlorinated aromatics under low water vapor (< 5%) and HCl (2%) concentrations. Further insights into the oxidation process were gained via in-situ FTIR spectroscopy and GC-MS analysis. The exceptional performance of Cu-Mn-Ce-O was attributed to the incorporation of CeO2, resulting in a lower H-2 reduction peak, smaller particle size, abundant surface active oxygen, and a higher specific surface area. To understand the reaction mechanism, the relationship between inlet and outlet gas compounds and the reaction temperature over Cu-Mn-Ce-O was studied, revealing the presence of NO/NOx during the reaction at temperature up to 300 degrees C.