Toluene oxidation on Pd catalysts supported by CeO2-Y2O3 washcoated cordierite honeycomb

摘要

A novel CeO2-Y2O3 (CY) washcoat on cordierite honeycomb was prepared by an impregnation method, which was used as a support to prepare a Pd catalyst. A model reaction of the complete combustion of toluene was conducted to evaluate the performance of the developed Pd/CY catalyst. The CY washcoat support and the Pd/CY catalyst were characterized by XRD, Raman spectroscopy, H-2-TPR and SEM techniques. The results show that compared with conventional washcoat the CY washcoat has better adhesion and higher vibration- and heat-resistance. The CY washcoat can anchor well Pd onto the cordierite honeycomb substrate. The formation of a CeO2-Y2O3 Solid solution and the steady present of PdO occur at high calcination temperatures, resulting in a better thermal stability. On a Pd/CY catalyst calcined at 500 degrees C, a 99% of toluene conversion was obtained at 2 10 degrees C, and it was stable for reaction time up to 30 h. (c) 2006 Elsevier B.V. All rights reserved.