在这里,三种负载型催化剂,通过简便的浸渍法合成了CuO/Al2O3,CeO2/Al2O3和CuO-CeO2/Al2O3,以揭示CeO2的添加对甲苯氧化的催化性能和反应机理的影响。与CuO/Al2O3比拟,T50和T90(温度在甲苯转化率为50%和90%时,分别)的CuO-CeO2/Al2O3降低了33和39°C,分别。N2吸附-解吸实验,XRD,SEM,EDS映射,拉曼,EPR,H2-TPR,O2-TPD,XPS,NH3-TPD,甲苯-TPD,和原位DRIFTS进行表征这些催化剂。CuO-CeO2/Al2O3的优异催化性能可归因于其强的铜-铈相互作用和高的氧空位浓度。此外,原位DRIFTS证明CuO-CeO2/Al2O3促进了甲苯向苯甲酸酯的转化,加速了甲苯的深度降解路径。这项工作为开发有效和经济的挥发性有机化合物催化剂提供了宝贵的见解。
Herein, three supported catalysts, CuO/Al2O3, CeO2/Al2O3, and CuO-CeO2/Al2O3, were synthesized by the convenient impregnation method to reveal the effect of CeO2 addition on catalytic performance and reaction mechanism for toluene oxidation. Compared with CuO/Al2O3, the T50 and T90 (the temperatures at 50% and 90% toluene conversion, respectively) of CuO-CeO2/Al2O3 were reduced by 33 and 39 °C, respectively. N2 adsorption-desorption experiment, XRD, SEM, EDS mapping, Raman, EPR, H2-TPR, O2-TPD, XPS, NH3-TPD, Toluene-TPD, and in-situ DRIFTS were conducted to characterize these catalysts. The excellent catalytic performance of CuO-CeO2/Al2O3 could be attributed to its strong copper-cerium interaction and high oxygen vacancies concentration. Moreover, in-situ DRIFTS proved that CuO-CeO2/Al2O3 promoted the conversion of toluene to benzoate and accelerated the deep degradation path of toluene. This work provided valuable insights into the development of efficient and economical catalysts for volatile organic compounds.