Toluene Combustion over Pd-Ce0.4 Zr0.6 O2 Directly Washcoated Monolithic Catalysts

A Ce0.4Zr0.6O2 washcoat was prepared using an impregnation method, which acted as a host for the active Pd component to prepare a Pd-Ce0.4Zr0.6O2/substrate monolithic catalyst for toluene combustion. The catalyst was characterized by scanning electron microscopy (SEM), Raman spectroscopy, Brunauner-Emmett-Teller (BET), and carbon monoxide temperature-programmed reduction (CO-TPR). It was found that the washcoat had strong vibration-shock resistance according to an ultrasonic test. The Pd-Ce0.4Zr0.6O2/substrate monolithic catalyst calcined at 400 °C showed 95% toluene conversion at a temperature as low as 210 °C. Furthermore, the lowest temperature for 95% toluene conversion was increased by 40 °C after the catalyst calcined at 900 °C, indicating that the catalyst had good thermal stability. The results revealed that the developed catalyst in this study was promising for eliminating volatile organic compounds (VOCs).