Catalytic combustion of toluene over platinum supported on Ce–Zr–O solid solution modified by Y and Mn

Abstract

A series of CeO 2–ZrO 2 mixed oxides were prepared using coprecipitation method and characterized by BET, oxygen storage capacity (OSC), X-ray diffraction (XRD) and H 2-temperature-programmed reduction (H 2-TPR). The catalytic activities toward toluene combustion were investigated in a micro-reactor. The results demonstrate that the catalytic activity of Pt/γ-Al 2O 3/Ce 0.50Zr 0.50O 2 monolithic catalyst can be greatly improved by doping metal into Ce 0.50Zr 0.50O 2. When doping Y and Mn into Ce 0.50Zr 0.50O 2 simultaneously, the catalyst Pt/γ-Al 2O 3/Ce 0.40Zr 0.40Y 0.10Mn 0.10O X shows the highest activity. The T 10 (the temperature of 10% toluene conversion) and the complete conversion temperature (the temperature of 90% toluene conversion) of toluene are 443 and 489 K, respectively. Gas hourly space velocity (GHSV) results show that the prepared catalyst can be applied in a wide range of GHSV (from 12,000 to 20,000 h −1). The catalyst prepared shows great potential for practical application.