Study on the performance and mechanism of high-efficiency deep oxidation of butyl acetate over Pd/CeO2
In the field of new energy vehicles and related sectors,treating butyl acetate(BA),a typi-cal oxygen-containing volatile organic compound(VOC),is becoming increasingly important.The sur-face structure and physicochemical properties of a CeO2-U catalyst were adjusted by introducing 0.5％Pd,and compared with Al2O3 and TiO2 catalysts containing the same Pd loading.Characterizations using SEM,XPS,in-situ DRIFTS,and other methods were conducted to explore the synergistic effect of Pd and Ce active components on catalytic oxidation of BA.The results showed that the introduction of Pd increased CeO2-U's CO2 yield from 77.8％to 90.7％at 220 ℃,significantly promoting the deep oxidation process of BA and alleviating the issue of CO2 selectivity delay.The introduction of Pd en-hanced the mobility and reactivity of lattice oxygen in CeO2,increased the proportion of surface Ce3+,and boosted surface oxygen vacancy concentration.Additionally,the catalytic oxidation mechanism of BA over Pd/CeO2-U was confirmed through in-situ DRIFTS analysis,indicating that the L-H mecha-nism was followed at low temperatures(T＜200 ℃),while the MvK reaction mechanism occurred fol-lowed at high temperatures(T＞200 ℃).It was found that the decomposition of intermediate carbox-ylate served as the rate-controlling step.These findings have implications for controlling BA in the field of related sectors.
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