Abstract
FMO was doped with nickel (NFMO) and lanthanum (LFMO) and compared for catalytic oxidation of chlorobenzene (CB), with NFMO showing superior activity (T90 = 192 ℃, 600 ppm CB/dry air, GHSV=20,000 h−1), CO2 selectivity and durability. And great water-resistance with T90 = 195 °C in humid air (H2O = 1.6 wt%), which is critical for real-world applications. The strong interaction between Ni and FMO enhances the contents of both reactive oxygen species (ROS) and surface Mn4+ species, which elevate the low temperature reactivity of NFMO. Both total acid content and Lewis/Brønsted acid ratio were enhanced during the nickel doping process. The stronger and more Lewis acid sites facilitated the dechlorination reaction and C-C band cleavage, further improving the catalytic performance at lower temperature. Oppositely, the addition of lanthanum reduced the total acid content and Lewis/Brønsted acid ratio, resulting in the Cl species accumulation at La-Fe or La-Mn interfaces and deactivation of LFMO.
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